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firstname.lastname@example.org Department of Civil The Standard Penetration Test (SPT ) is the most common in-situ tests for soil inves- and Environmental tigations. On the other hand, the Cone Penetration Test (CPT ) is considered one of Engineering, National University of Science the best investigation tools. Many CPT-SPT correlation relationships have been pro- and Technology, Muscat, posed worldwide to estimate soil parameter from the other’s available data. However, Sultanate of Oman unfortunately, no available SPT-CPT correlations are established for the alluvial soil of Full list of author information is available at the end of the Dhaka city. This paper aims at presenting correlations among the SPT-N value, cone tip article resistance (q ), sleeve friction resistance (f ), soil behavior index (I ) and mean particle c s c size (D ) for an alluvial soil deposit of Dhaka city. It is found that for the relationship between equivalent SPT N -value and SPT N -value the coarser soil layers As and As 60 60 1 2 show the coefficient of correlation (R ) is 0.7106 and 0.534 respectively, which indicate a reliable relationship. In addition, the correlation between cone tip resistance (q ) and SPT N -value shows very strong relationship which is very similar to proposed Meyer- hof correlation. Furthermore, the relations between other mentioned parametres also shows a valid correlations similar to other authors. Keywords: SPT, CPT, Tip resistance, Sleeve friction, Correlation Introduction The standard penetration test (SPT) is still the most commonly used in-situ tests for obtaining the required geotechnical parameters for foundation analysis and design in Bangladesh . Geotechnical engineers in Bangladesh are likely to request CPT tests only for moderate to high-risk projects . Recently some mega projects are commenced in Bangladesh especially in Dhaka city and therefore more accurate soil parameters are highly demanded. In contrast, the Cone Penetration Test (CPT) is becoming more popu- lar for site investigations and geotechnical design because of its continuous data meas- urement. CPT test is relatively costly and not available always for ordinary practice and local contractors do not offer them also. The correlation of CPT data with the SPT N-value is very beneficial since in most situ - ations, only SPT data is available and numerous soil parameters are related to the SPT N-value. However, unfortunately, there are no available SPT-CPT correlations for Dhaka alluvial soil is established. This paper aims at presenting correlations between the SPT- N60 value, cone tip resistance (qc) and sleeve friction resistance (fs) for an alluvial soil © The Author(s) 2022. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the mate- rial. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http:// creat iveco mmons. org/ licen ses/ by/4. 0/. Arifuzzaman and Anisuzzaman International Journal of Geo-Engineering (2022) 13:5 Page 2 of 13 deposit of Dhaka city. The correlations were devised from the results of 15 bore log data of SPT and CPT test. Available SPT‑CPT correlations Many Geotechnical researchers have explicit the importance of SPT-CPT correlations. The researchers have focused on some parameters like the SPT-N value, cone tip resistance (q ), the qc/N ratio, the mean grain size (D ), fine contents (FC) of the soil, c 50 atmospheric pressure (Pa) and soil behaviour index (I ). Some of the commonly accepted CPT–SPT correlations are presented by the following equations. According to Meyerhof  q = (2.5 to 5.5) N ∗ 0.098(MPa) c 60 (1) According to Lunne et al.  and Robertson : q /p /N = 8.5 1 − Ic/4.6 ( ) ( ) c a 60 (2) and (1.1268−0.2817Ic) (q /p )/N = 10 (3) c a 60 According to Kulhawy and Mayne  and Chin et al.  (q /p )/N = 4.25 − (FC/41.3) c a 60 (4) 0.26 q /p )/N = 5.44 (D ) (5) c a 60 50 (q /p )/N = 4.75 − (FC/20) c a 60 (6) Field test and data selection SPT test The Standard Penetration Test as per ASTM D 1586 was executed using an automatic trip hammer at 1 m intervals of depth. The drilling was facilitated using heavy-duty rotary drill rigs, equipped with a minimum 120 mm cutting tool. An SPT sampler, con- nected with the required length of BW size rod to a 63.5 kg hammer, is inserted into the boring. SPT sampler is split- spoon sampler with a ball valve to permit exit of air or water from the top during driving and to assist in retaining sample during withdrawal; in addition, the sampler has a tapered shoe for allowing penetration into the hard ground. The number of blows required to progress the sampler 450 mm is recorded in every 150 mm intervals. The field SPT N-value is calculated by summing the hammer blows required to advance the sampler during the last two intervals of the test. The corrected SPT N60 is then calculated from the field SPT N-value by using the following formula Das . SPT N × η × η × η H S R SPT N = (7) 60 A rifuzzaman and Anisuzzaman International Journal of Geo-Engineering (2022) 13:5 Page 3 of 13 where SPT N = Corrected standard penetration number for field condition; SPT N = Measured standard penetration number for 300 mm penetration; η = Hammer 60 H efficiency (%); η = Sampler correction; η = Rod length correction. S R CPT test Electronic Cone Penetration Testing was carried out using a 15 cm projected area elec- tronic cones with 60° apex angle and 225 c m friction sleeve area advance using a 20 Ton hydraulic penetrometer. CPT tests were conducted in accordance with ASTM D 5778. Throughout the test, the cone was advanced by applying thrust on a 1 m long 36 mm diameter rod at a rate of 2.0 cm per second. After the advancement of each 1 m seg- ments, the subsequent rod was attached and the operation was repeated. The cone used is a subtraction type cone equipped with instruments to measure Cone Pressure, Sleeve Friction and Dynamic Pore Pressure. The depth of the cone was recorded using an opto - electric encoder. All data was recorded for every centimetre automatically in a computer running proprietary software. Prior to the commencement of each test, the pressure transducer of the cone was saturated using silicon oil. The cone was calibrated prior to commencement and at the end of each test conforming to the specification using CPTest software, this software also automatically recorded all data from the cone. Data selection The bore log depth reached a maximum depth of 40.24 m from the existing Ground Level. Sample data for this study was obtained from 15 bore log data of CPT and SPT soil investigations for Dhaka Metro Rail Projects. The closest available testing locations, which are not more than 10 cm apart from each other were chosen to establish the SPT– CPT correlations for each site. Each SPT boring log contained a soil profile with dif - ferent soil layers classified based on the laboratory tests (i.e., sieve analysis, hydrometer analysis, and Atterberg limits test). Methodology Site location Dhaka is situated between latitudes 23° 42′ and 23° 54′ N and longitudes 90° 20′ and 90° 28′ E. The field data used in this research were collected from SPT and CPT tests con - ducted to investigate the subsoil for the project of Dhaka Metro Rail. The details of CPT and SPT borings are presented in Table 1. Data matching and correlations The SPT values were collected every 1.0 m interval on the other hand CPT values are recorded at every 0.1 m interval. The average q and f values were compared with the c s SPT N -values located at the same elevation. As the SPT N -values intervals are larger 60 60 than those provided by CPT; the SPT N -values were selected as the reference for the corresponding CPT values. The correlation process involved separating each type of soil from all boreholes and combining them into a single analysis. The type of the soil is also confirmed from both laboratory investigation results and from soil behaviour index (I ) values obtained from the CPT test. Arifuzzaman and Anisuzzaman International Journal of Geo-Engineering (2022) 13:5 Page 4 of 13 Table 1 Bore log location of SPT and CPT Serial no. Borehole name Surveyed coordinates Ground Penetration elevation (m) depth (m) Easting Northing 1 ST1 231,909.000 2,642,226.000 5.97 30.74 2 ST2 231,655.000 2,641,202.000 5.16 40.01 3 ST3 231,488.517 2,637,578.649 9.41 40.05 4 ST4 231,575.000 2,636,726.000 12.46 40.02 5 ST5 231,855.355 2,634,597.502 9.94 40.04 6 ST6 232,227.499 2,634,466.291 6.90 40.04 7 ST7 232,550.607 2,633,584.036 6.85 40.06 8 ST8 232,994.650 2,632,208.537 7.11 40.06 9 ST9 233,290.654 2,630,836.830 7.98 40.18 10 ST10 233,687.125 2,629,992.400 8.71 40.10 11 ST11 234,249.975 2,629,123.045 7.88 40.04 12 ST12 234,549.245 2,627,800.611 8.13 40.06 13 ST13 234,625.519 2,626,931.132 8.18 33.93 14 ST14 235,811.027 2,626,747.089 7.08 40.06 15 ST15 236,889.439 2,626,499.568 5.87 40.24 Table 2 CPT soil behaviour type No Soil behavior type index, Ic Soil behavior type (SBT) A < 1.31 Gravelly sand and dense sand B 1.31 ~ 2.05 Clean sand to silty sand C 2.05 ~ 2.60 Silty sand to sandy silt D 2.60 ~ 2.95 Clayey silt to silty clay E 2.95 ~ 3.60 Silty clay to clay F 3.60 < Peat materials The relationship between I and soil behavior type developed by Robertson and Wride  is presented in Table 2. Results and discussions Subsoil characteristics Figure 1 shows a generalized soil profile of Dhaka soil, as well as the results of soil behav - iour index (I ) and percentage of soil particle type with depth. The soil particle percent - ages are calculated from laboratory investigations and the samples were collected during SPT tests. The types of the soil layers are confirmed based on both laboratory investiga - tions results as well as soil behaviour index (I ) values of different layers obtained from the CPT test. From Fig. 1 it is revealed that the subsoil is composed of a surficial layer of alluvial silty clay or clayey silt (Ac ) of the thickness of about 15 m to 17 m. Moreo- ver, soil behaviour index (I ) values mostly lie between 2.60 to 3.60. It means that soil is clayey silt to silty clay. Again, from Fig. 1 it is observed that in this layer the percentage of clay and silt particles varies between 53.2 to 99.8%. It indicates that this layer is a fine layer and can be classified as silty clay or clay silt (CH or CL). Underneath the alluvial clayey silt or silty clay layer, medium dense alluvial silty fine sand (As ) and dense to very 1 A rifuzzaman and Anisuzzaman International Journal of Geo-Engineering (2022) 13:5 Page 5 of 13 Soil Particle (%) Soil Behaviour Soil Index, Ic profile 0255075100 1234 5 10 10 5 5 Ac 0 0 -5 -5 -5 -10 -10 -10 As -15 -15 -15 -20 -20 -20 -25 -25 -25 -30 -30 -30 As A D B C E F -35 -35 -35 Clay + Silt Clay -40 -40 -40 Fig. 1 Soil profile of Dhaka soil with particle percentage and soil behaviour index (Ic) with depth Table 3 Physical properties of soil layers Physical properties Alluvial silty clay or clayey Medium dense alluvial Dense to very dense silty silt (Ac ) silty fine sand (As ) fine to medium sand (As ) 1 1 2 No. of data Range No. of data Range No. of data Range Specific gravity, G 34 2.66 to 2.72 52 2.65 to 2.71 52 2.65 to 2.71 Natural water content, 34 21.0 to 26.8 – – w (%) Mean particle size, D 34 0.0014 to 0.029 52 0.115 to 0.210 52 0.157 to 0.270 (mm) Fine content, FC (%) 34 73.1 to 94.3 52 21.0 to 36.0 52 19.7 to 27.3 Clay (%) 34 31.97 to 49.4 23 3.6 to 11.8 13 3.0 to 5.8 Silt (%) 34 33.4 to 52.6 23 20.7 to 30.1 13 19.8 to 22.0 Liquid limit, LL (%) 34 37 to 53 – – Plastic limit, PL (%) 34 16 to 20 – – SPT N 60 6 to 20 208 14 to 38 210 34 to 66 dense silty fine to medium sand (As ) layers are present having clay and silt particles between 19.8 to 30.1% and soil behaviour index (I ) mostly lie between 2.0 to 3.0. The physical and index properties of different soil layers (Ac, As and As ) are presented in 1 1 2 Table 3. Correlation between SPT N‑Value and equivalent SPT N‑value from CPT Figure 2 shows the equivalent SPT N -value obtained from CPT and SPT N -value 60 60 with depth. SPT N -value was taken at every 1.0 m interval whereas CPT N -value was 60 60 recorded from CPT test at 0.1 m interval for the same test location. An attempt is taken to correlate the equivalent SPT N -value obtained from CPT test and SPT N -value for 60 60 Elevation (m) Arifuzzaman and Anisuzzaman International Journal of Geo-Engineering (2022) 13:5 Page 6 of 13 Equivalent SPT N -Value SPT N -Value 60 60 Soil Profile 0255075100 125 0255075100 125 10 10 CPT: ST1 SPT:ST1 CPT:ST2 SPT:ST 2 5 CPT: ST3 5 5 SPT: ST3 CPT:ST4 SPT:ST4 Ac CPT:ST5 SPT:ST5 0 0 0 CPT:ST6 SPT:ST6 CPT:ST7 SPT:ST7 CPT:ST8 SPT:ST8 -5 -5 -5 CPT:ST9 SPT:ST9 CPT:ST10 SPT:ST10 CPT:ST11 SPT:ST11 -10 -10 -10 CPT: ST12 SPT:ST12 CPT:ST13 SPT:ST13 As 1 CPT:ST 14 SPT:ST14 -15 -15 -15 CPT:ST15 SPT:ST15 -20 -20 -20 -25 -25 -25 -30 -30 -30 As -35 -35 -35 -40 -40 -40 Fig. 2 Soil profile of Dhaka soil with equivalent SPT N-value and corrected SPT N-value with depth individual soil layers. Tissoni  compares the SPT N from Standard Penetration Test and equivalent SPT N from a dynamic cone penetration test. The tests were carried out in sandy-silty gravel. According to the author: Equivalent SPT N = 0.60 SPT N (8) 60 60 Again, Muromachi and Kobayashi  also studied the correlation between SPT N and equivalent SPT N for both fine and coarse soil. According to the author: Equivalent SPT N = 1.15 SPT N 60 60 (9) Figure 3 shows the correlation between equivalent SPT N -value and SPT N -value 60 60 for different alluvial soil layers for the current study. The linear correlation observed for these layers are: For, fine and coarse soil, Equivalent SPT N = 0.9273 SPT N 60 60 (10) For, clayey silt or silty clay layer, Ac Equivalent SPT N = 0.5356 SPT N (11) 60 60 For, medium dense silty fine sand, As Equivalent SPT N = 0.940 SPT N 60 60 (12) For, very dense silty fine to medium sand As layer, Elevation (m) A rifuzzaman and Anisuzzaman International Journal of Geo-Engineering (2022) 13:5 Page 7 of 13 Equivanent SPT N = 0.9273 SPT N 60 60 Equivanent SPT N = 0.5356 SPT N 60 60 R² = 0.8666 R² = 0.2657 Clayey Silt or Fine Soil + Coarse Soil Silty Clay, Ac SPT N (blows/0.3 m) SPT N (blows/0.3 m) (a) (b) Equivanent SPT N = 0.94 SPT N 60 60 Equivanent SPT N = 0.9303 SPT N 60 60 R² = 0.7106 R² = 0.534 Very Dense SiltyFine to Medium Dense Silty Medium Sand,As Fine Sand, As 20 40 60 80 SPT N (blows/0.3 m) SPT N (blows/0.3 m) (d) (c) Fig. 3 Correlation between equivalent SPT N -value and corrected SPT N -value 60 60 Equivalent SPT N = 0.9303 SPT N 60 60 (13) It is observed that the obtained correlations between the equivalent SPT N -value and corrected SPT N -value is very similar to the correlation obtained by previous authors. Therefore, this correlation should be used to correlate the equivalent SPT N -value and corrected SPT N -value for Dhaka soil. 60 60 The coefficient of correlation (R ) measures the strength of the correlation between two variables. For the alluvial clayey silt or silty clay (A c ) layer, the R value is 0.2657, which indicates that there is a poor correlation between equivalent SPT N -value and corrected SPT N -value. However, the coarser soil layer As and As the coefficient 60 1 2 of correlation (R ) are 0.7106 and 0.534 respectively, which indicate reliable relation- ships between equivalent SPT N -value and SPT N -value. The reason behind this 60 60 dissimilarity because of the wide range of particle size, fine content, density of soil layers and index properties etc. In addition, the number of data of each soil layer is also a very important factor. It is clearly shown that the correlation is very sound for combined fine and coarse layers, compared to individual soil layers because of having Equinalent SPT N Equinalent SPT N Equinalent SPT N Equinalent SPT N 60 Arifuzzaman and Anisuzzaman International Journal of Geo-Engineering (2022) 13:5 Page 8 of 13 large data. However, more case study with experimental data is required to clarify this variation. Correlation between q and SPT N v ‑ alue and comparison with Meyerhof c 60 Figure 4a shows the correlation of q and SPTN (simply N ) obtained from all the data c 60 60 points of fifteen locations of this study. It is found in Fig. 4a that: q = 4.0N ∗ 0.098 c 60 (14) and the coefficient of correlation (R ) is 0.6758 indicating a good relationship. Accord- ing to Meyerhof : q = (2.5 to 5.5) N ∗ 0.098(MPa) c 60 (15) The found correlation is in the middle of the range of Meyerhof analysis. It represents very strong relationship between q and SPTN for the alluvial soil deposit of Dhaka c 60 city. q = 2.6 N *0.098 c 60 R² = 0.6582 Clayey Silt or Fine Soil + Coarse Soil Silty Clay, Ac 0255075100 125 SPT N (blows/0.3 m) SPT N (blows/0.3 m) (a) (b) q = 4.4 N *0.098 q = 3.8 N * 0.098 c 60 c 60 R² = 0.6829 R² = 0.509 Medium Dense Silty Very Dense Silty Fine Sand, As Fine to Medium Sand, As SPT N (blows/0.3 m) 60 SPT N (blows/0.3 m) (c) (d) Fig. 4 Correlation between q and SPT N -value for different soil layers c 60 Cone Resistance, qc [MPa] Cone Registance q (Mpa) Cone Resistance, qc [MPa] Cone Resistance, qc [MPa] A rifuzzaman and Anisuzzaman International Journal of Geo-Engineering (2022) 13:5 Page 9 of 13 An attempt is also taken to investigate this relationship for individual soil layers. Fig- ure 4b–d show the correlation of q and SPT N for different alluvial soil layers. It is c 60 observed that both the alluvial silty fine sand and silty fine to medium sand layers (As and As ) provide good correlations and remain in the middle of the range of Meyerhof analysis. However, the correlation between q and SPT N for cohesive soil layer (Ac ) is c 60 1 remained in the lower of the range of Meyerhof  analysis. It indicates that alluvial coarse soil shows better correlations than the alluvial fine soil. Correlation between f and SPT N v ‑ alue s 60 Figure 5a shows the correlation between sleev friction resistance (f ) and SPT N s 60 obtained from all the data points of different soil layers (fine and coarse) of fifteen loca - tions. It is found from the Fig. 5a that: Sleeve friction resistance, f = 4.66N + 70.2 s 60 (16) f = 6.813N + 32.8 s 60 R² = 0.3653 f = 4.66N + 70.2 s 60 R² = 0.6408 300 Clayey Silt or Fine Soil + Coarse soil Silty Clay, Ac (SPT N (blows/0.3 m) 60 (SPT N (blows/0.3 m) (a) (b) fs = 3.04 N + 141.4 f = 5.75N + 51.0 s 60 R² = 0.3052 R² = 0.5579 600 Medium Dense Silty Very Dense Silty Fine Sand, As Fine to Medium Sand, As 20 40 60 80 100 (SPT N (blows/0.3 m) (SPT N (blows/0.3 m) (c) (d) Fig. 5 Correlation between f and SPT N -value for different soil layers s 60 Sleeve Resistance, f (Kpa) Sleeve Resistance, f (Kpa) s s Sleeve Resistance, f (Kpa) Sleeve Resistance, f (Kpa) s s Arifuzzaman and Anisuzzaman International Journal of Geo-Engineering (2022) 13:5 Page 10 of 13 and the coefficient of correlation (R ) is 0.6408 it indicates a good relationship exists between f and SPT N In addition, Fig. 5b–d represent the correlation between f and s 60. s SPT N for individual soil layers. The linear correlation observed for these layers are: For, clayey silt or silty clay layer, Ac Sleeve friction resistance f = 6.81N + 32.8 s 60 (17) For, medium dense silty fine sand, As Sleeve friction resistance f = 5.75N + 51.0 s 60 (18) For, very dense silty fine to medium sand As layer, Sleeve friction resistance f = 3.04N + 141.4 s 60 (19) Jarushi et al.  studied the correlation between SPT and CPT for various soil in Flor- ida. The observed correlation by the author are: For, silty fine sand soil (SM) Sleeve resistancef = 0.5N + 92 s 60 (20) For, clayey fine sand soil (SC ) Sleeve resistance f = 1.8N + 65 s 60 (21) For, fine sand with silt soil (SM/SC) Sleeve resistance f = 6.2N − 16 s 60 (22) It is observed that the obtained correlation from this study has a similar trend as obtained by Jarushi et al. . However, some dissimilarity is observed in the correlation and it is justifiable because of a wide range of dissimilarities of soil properties all over the world. Although the f , has customarily been realized as less reliable than the cone tip resist- ance plays an important role in the quality of soil type. Nevertheless, the relationship between f and N were investigated to quantify the effect of soil type. s 60 The above correlations were obtained by using the same process as in the q and SPT N analysis. The alluvial clayey silt or silty clay soil layer shows a linear relationship between f and SPT N with a coefficient of correlation (R ) that is 0.3653. However, s 60 medium dense alluvial silty fine sand and dense to very dense alluvial silty fine sand have a coefficient of correlation (R ) of 0.5579 and 0.3052 respectively. It is exposed that the medium dense alluvial silty fine sand layer shows a better relationship among the other soil types. Correlation between (q /p )/N with mean particle size (D ) c a 60 50 The grain size distribution of the studied soil samples of the fifteen stations are present in Fig. 6. It is revealed that the mean particle size for Ac layer is between 0.0017 to 0.027 mm, for As layer is between 0.07 to 0.30 mm and for As layer is between 0.095 to 1 2 0.35 mm. The correlation between (q /p )/N and mean particle size (D ) is presented c a 60 50 A rifuzzaman and Anisuzzaman International Journal of Geo-Engineering (2022) 13:5 Page 11 of 13 Clayey Silt or Silty Clay, Ac 10 1 0.1 0.01 0.001 Particle Size, (mm) (a) Medium Dense Silty Fine Sand, As 10 1 0.1 0.01 0.001 Particle Size, (mm) (b) Very Dense Silty Fine Sand, As 10 1 0.1 0.01 0.001 Particle Size, (mm) (c) Fig. 6 Grain size distribution of the studied soil samples of the fifteen stations Kulhawy and Mayne Power (Series9) 0.1944 y = 5.1636x R² = 0.2476 0.001 0.0100.100 1.000 D (mm) Fig. 7 Correlation between (q /p )/N and D c a 60 50 (qc/pa)/N Percent Finer Percent Finer Percent Finer Arifuzzaman and Anisuzzaman International Journal of Geo-Engineering (2022) 13:5 Page 12 of 13 in Fig. 7. It is found that the correlation between (q /p )/N and D is quite representa- c a 60 50 tive as it is very close to the correlation of Kulhawy and Mayne . According to Kulhawy and Mayne  the correlation between ( q /p )/N and D is: c a 60 50 0.26 (q /p )/N = 5.44(D ) (23) c a 60 50 On the other hand, the relation obtained from this study is presented by: 0.1944 (q /p )/N = 5.1636(D ) (24) c a 60 50 This minor variation may occur because of the wide range of mean particle size (D ) from 0.0017 mm to 0.35 mm. Correlation between (q /p )/N with soil behaviour index (Ic) c a 60 The correlation between (q /p )/N and soil behaviour index (Ic) is presented in Fig. 8. It c a 60 is revealed from Fig. 8 that the obtained correlation between (q /p )/N with Ic is almost c a 60 similar to the proposed correlation of Lunne et al. . According to Lunne et al. : q /p /N = 8.5 1 − I /4.6 ( ) ( ) c a 60 c (25) And the correlation obtained from this study is: (q /p )/N = 7.9(1 − I /4.8) c a 60 c (26) However, the coefficient of correlation (R ) of the obtained correlation is 0.2091, which indicates a satisfactory linear relationship between (q /p )/N and soil behaviour index c a 60 (Ic). Conclusion This study was conducted to develop a CPT-SPT correlation among various alluvial soil deposits of Dhaka city. There is no theoretically sound as well empirical method that can be used to describe accurately the CPT-SPT relationship. Many SPT-CPT correlation methods have been developed in various countries but their worldwide application is limited due to the inherent variability of the test techniques and the nature and condi- tion of the soils tested. y = 7.9(1- Ic/4.8) R² = 0.2091 Lunne et al. 1.0 1.5 2.0 2.5 3.0 3.5 4.0 Soil Behaviour Index (Ic) Fig. 8 Correlation between (q /p )/N and Ic c a 60 qc/pa)/N 60 A rifuzzaman and Anisuzzaman International Journal of Geo-Engineering (2022) 13:5 Page 13 of 13 The analysis results of this study revealed that there is a satisfactory correlation between equivalent SPT N -value and corrected SPT N -value for the cohesive layer. 60 60 However, for the coarse-grained soil layers, it shows reliable relationships between CPT based equivalent SPT N -value and SPT N -value. 60 60 It is observed that both the alluvial silty clay or clayey silt and silty fine sand layers exposed good correlations between q and N . However, the correlation between q and c 60 c N for cohesive soil layer is in the lower range of Meyerhof  analysis. In addition, it is revealed that medium dense alluvial silty the fine sand layer shows a better relationship between f and N among the other type of soil. s 60 As an overall conclusion, the correlations between the SPT and CPT manifests a reli- able correlation in the Dhaka city area for alluvial coarser soils with fines. Acknowledgements Authors are grateful to the Nippon Koei-NK India-DMRC-MOTT UK-MOTT India-DDC (NKDM association), and Depart- ment of Civil Engineering of Bangladesh University of Engineering and Technology for giving support for conducting this research. Authors are also grateful to Development Construction Limited (DCL) for supporting to conduct SPT and CPT Tests. Authors’ contributions Arifuzzaman, the corresponding author conceived the project performed all the laboratory investigations. Arifuzzaman and MA analyzed the data and wrote the manuscript. Both authors read and approved the final manuscript. Declarations Competing interests The authors declare that they have no competing interests. Author details Department of Civil and Environmental Engineering, National University of Science and Technology, Muscat, Sultanate of Oman. Department of Civil Engineering and Architecture, Instituto Superior Tecnico (IST ), Lisbon, Portugal. Received: 12 January 2021 Accepted: 22 September 2021 References 1. Chin C, Duann S, and Kao T (1988) SPT–CPT correlations for granular soils. International Proceedings of the 1st inter- national symposium on penetration testing, (ISOPT-1). pp. 335–339 2. Das BM (2011) Principle of Foundation Engineering, 7th edition, USA. pp. 83–84 3. Jarushi F, AlKaabim A, Cosentino P (2015) “A new correlation between SPT and CPT for various soils”. World Academy of Science, Engineering and Technology. Int J Geol Environ Eng 92:101–107 4. 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International Journal of Geo-Engineering – Springer Journals
Published: Dec 1, 2022
Keywords: SPT; CPT; Tip resistance; Sleeve friction; Correlation
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