Papers by rakesh kumar Dutta
Performance of Rectangular Footing on Loose Sand Reinforced with Micropiles
Indian Geotechnical Journal
This study uses finite element analysis to determine the ultimate bearing capacity and the settle... more This study uses finite element analysis to determine the ultimate bearing capacity and the settlement of the rectangular footing reinforced with micropiles under concentric, vertical loads. The parameters varied were size of footing (2 m × 2 m–4 m × 2 m), the size of square micropiles (0.1–0.4 m), the length of micropiles (5–10 m), number of micropiles (8–16) and the distance between the edge of footing and micropiles (0.1–0.8 m). The study’s results indicate that for all micropile spacing and micropile distances from the edge of the footing, the bearing capacity increases while the relative settlement decreases with micropile size. The results further revealed that the bearing capacity increases, and relative settlement decreases with increase in the number of micropiles around the footing. In comparison with rectangular footing, square footing has a higher bearing capacity. Further, the effect of length of the micropiles is linked with the edge distance and the size of micropile.
Bearing Capacity of Skirted Ring Footing on Dense Sand Overlying Loose Sand
Current Indian Science
Introduction: The ultimate bearing capacity of an unskirted/skirted ring foundation on dense sand... more Introduction: The ultimate bearing capacity of an unskirted/skirted ring foundation on dense sand overlying loose sand is estimated using finite element analysis in this study. Method: The range of thickness ratio (thickness of top dense sand layer divided by external diameter of ring) was kept between 0.25 and 1.5. The friction angle of the upper dense and bottom loose sand layers was maintained between 40° and 44° and 30° and 34°, respectively. In the case of skirted ring footing, the skirts are attached at the inner edge, outer edge, and both the edges, respectively. Result: According to the results, the bearing capacity increases with an increase in either the friction angle of upper dense and lower loose sand layers or the thickness ratio. A double-skirted ring footing was observed to provide the greatest bearing capacity, followed by footing with skirts attached at the outer and inner edges, respectively. Conclusion: To sum up, the bearing capacity of the ring footing was high...
Numerical Study of Pullout Capacity of Multi-edges Multiplate Horizontal Anchors in Sand
Indian Geotechnical Journal
Geotechnical properties of bentonite mixed with nanosilica
Multiscale and Multidisciplinary Modeling, Experiments and Design
Reply to the Discussion: The Impact of Variation of Gypsum and Water Content on the Engineering Properties of Expansive Soil [DOI: 10.1007/s40515-021–00,192-5]
Transportation Infrastructure Geotechnology
Sensitivity analysis and estimation of improved unsaturated soil plasticity index using SVM, M5P, and random forest regression
Elsevier eBooks, 2023
Bearing capacity of skirted ring footing on soft clay overlying dense sand
Innovative Infrastructure Solutions
Numerical Estimation of Bearing Capacity of Shallow Footings Resting on Layered Sand
Transportation Infrastructure Geotechnology
Study of bearing capacity of skirted irregular pentagonal footings on different sands
Journal of Achievements in Materials and Manufacturing Engineering, 2021
Purpose: The paper presents an experimental and numerical study to evaluate the bearing capacity ... more Purpose: The paper presents an experimental and numerical study to evaluate the bearing capacity of unskirted, singly and doubly skirted irregular pentagonal footings on different sands (S1, S2, S3) at a relative density of 30 %. The skirt depth of the footing was varied from 0.0B to 1.5B (B is the width of the square footing). Design/methodology/approach: The experimental and numerical study of the singly and doubly skirted irregular pentagonal footing resting on sands was modelled in a test tank and Plaxis 3D software respectively. Findings: The results of this study reveal that the bearing capacity was higher for the skirted irregular pentagonal footings on sand S3 followed by sand S2 and S1. The lowest percentage improvement for the singly skirted footing on sand S3 was 18.51% at a Ds/B = 0.25 whereas the highest improvement was 90.81% at a Ds/B = 1.50 for the singly skirted footing on sand S2. The highest percentage improvement for the doubly skirted footing on sand S2 was 95.1...
Support Vector Machines-Based Prediction of Elastic Modulus for Granite Rock
Lecture Notes in Mechanical Engineering, 2022
Soft computing based prediction of friction angle of clay
Archives of Materials Science and Engineering, 2020
Purpose: This article uses soft computing-based techniques to elaborate a study on the prediction... more Purpose: This article uses soft computing-based techniques to elaborate a study on the prediction of the friction angle of clay. Design/methodology/approach: A total of 30 data points were collected from the literature to predict the friction angle of the clay. To achieve the friction angle, the independent parameters sand content, silt content, plastic limit and liquid limit were used in the soft computing techniques such as artificial neural networks, M5P model tree and multi regression analysis. Findings: The major findings from this study are that the artificial neural networks are predicting the friction angle of the clay accurately than the M5P model and multi regression analysis. The sensitivity analysis reveals that the clay content is the major influencing independent parameter to predict the friction angle of the clay followed by sand content, liquid limit and plastic limit. Research limitations/implications: The proposed expressions can used to predict the friction angle ...
Mechanical Behaviour of Bentonite-Cement Mixtures Subjected to Change in Moisture Content
Lecture Notes in Civil Engineering, 2021
The paper presents the prediction of the ultimate bearing capacity of the strip footing resting o... more The paper presents the prediction of the ultimate bearing capacity of the strip footing resting on layered soil (dense sand overlying loose sand) using random forest regression (RFR). In this study, 181 data collected from literature were used. 71 % of the total data was randomly selected for training the model and the rest of the data were utilized for the testing purpose. The various input parameters were friction angle of the dense sand layer (f1), friction angle of the loose sand layer (f2), unit weight of the dense sand layer (g1), unit weight of the loose sand layer (g2), ratio of the thickness of the dense sand layer below base of the footing to the width of footing (H/B), ratio of the depth of the footing to the width of the footing (D/B) and (H+D)/B. Ultimate bearing capacity was the output in this study. Performance measures were used in order to make the comparison with the artificial neural network (ANN) and M5P model tree. The result of this study revealed that the perf...
The present study attempts to predict the ultimate bearing capacity (UBC) of the strip footing re... more The present study attempts to predict the ultimate bearing capacity (UBC) of the strip footing resting on sand and subjected to inclined load having eccentricity with respect to the vertical using three different soft computing techniques such as support vector mechanism with radial basis function (SVM RBF kernel), M5P model tree (M5P) and random forest regression (RFR). The UBC was computed in the form of reduction factor and this reduction factor was assumed to be dependent on the ultimate bearing capacity (qu) of the strip footing subjected to vertical load, eccentricity ratio (e/B), inclination ratio (α/ϕ) and the embedment ratio (Df/B). The performance of each model was analyzed by comparing the statistical performance measure parameters. The outcome of present study suggests that SVM RBF kernel predicts the reduction factor with least error followed by M5P and RFR. All the model predictions further outperformed those based on semi-empirical approach available in literature. Fi...
Effect of stabilised granular column on the pressure settlement behaviour of clay
The paper presents an assessment of the suitability of an alternate material for use as stone agg... more The paper presents an assessment of the suitability of an alternate material for use as stone aggregates in stone column. A series of load tests were conducted in the model test tank using single granular column (30 mm in diameter and H/D ratio of 6) installed in a clay bed prepared at a water content of 30% to evaluate the improvement in pressure-settlement behaviour. The clay is reinforced with the different types of granular columns such as sand column, slate column, stone column, slate-sand column, stabilized granular column composed of slate, fly ash, cement and stabilized granular column made up of slate, fly ash, lime, gypsum. All the stabilized granular columns reinforced in clay bed have shown a significant improvement in pressure-settlement behaviour and ultimate bearing capacity. The increase in ultimate bearing capacity was highest for clay reinforced with stabilized granular column composed of slate, fly ash and cement followed by stabilized granular column made up of s...
Prediction of bearing capacity of H shaped skirted footings on sand using soft computing techniques
Archives of Materials Science and Engineering, 2020
Purpose: The present study aims to apply soft computing techniques, Artificial Neural Network (AN... more Purpose: The present study aims to apply soft computing techniques, Artificial Neural Network (ANN) and M5P model tree, to predict the ultimate bearing capacity of the H plan shaped skirted footing on the sand Design/methodology/approach: A total of 162 laboratory test data for the regular plan shaped (square, circular, rectangular, and strip (up to L/B = 2.5) skirted footing were collected from the literature to develop the soft computing-based models. These models were later modified for the H Plan shaped skirted footing with the introduction of the multiplication factor. The input variables chosen for the regular plan shaped footings were skirt depth to width of the footing ratio (Ds/B), friction angle of the sand (), the ratio of the interface friction angle-to-friction angle of sand (δ/), and length-to-width (L/B) ratio of the footing. The output is the bearing capacity ratio (BCR, a ratio of the bearing capacity of the skirted footing to the bearing capacity of un-skirted fo...
Journal of Natural Fibers, 2019
The paper presents the application potential of untreated/treated woven/nonwoven coir geotextile ... more The paper presents the application potential of untreated/treated woven/nonwoven coir geotextile in the unpaved roads. The chemical used for the treatment of the coir geotextiles were p-aminophenol, sodium periodate and sodium hydroxide. For this, laboratory monotonic load test was conducted in a test tank for the sand layer overlying clay and the untreated/treated coir geotextiles were placed at the interface under the unsoaked/soaked condition. The results of this study reveal that the models reinforced with untreated/ treated woven and non-woven coir geotextiles show the improvement in the bearing capacity beyond a deformation of 9 to 13 mm. Further, models reinforced with untreated/treated woven and non-woven coir geotextiles show better improvement in the bearing capacity in the unsoaked condition in comparison to the soaked condition. Untreated/treated woven/non-woven coir geotextiles when placed at the interface of the sand layer overlying clay can be useful in unpaved roads in improving the bearing capacity especially in those situations where the rut depth is high as the improvement in the bearing capacity was realized up to larger deformation. 摘要 本文介绍了未经处理/处理的编织/无纺布椰壳纤维土工布在未铺筑道路上 的应用潜力.用于椰壳纤维土工织物处理的化学物质是对氨基苯酚、高碘酸 钠和氢氧化钠.为此，在试验箱中对覆盖粘土的砂层进行了实验室单调荷载 试验，未经处理/处理的椰壳土工布在未浸水/浸泡条件下放置在界面处.本 研究的结果表明，未经处理/处理的织物和无纺布椰壳纤维土工布加固的 模型显示，变形超过9至13 mm后，承载力有所改善.此外，未经处理/处理 的编织和无纺布椰壳纤维土工布加固的模型显示，与浸泡条件相比，未浸 泡条件下的承载力有更好的改善.未经处理/处理的编织/无纺布椰壳土工布 放置在覆盖粘土的砂层界面时，可用于未铺筑道路，以提高承载力，尤其 是在车辙深度较高的情况下，因为承载力的提高可达到更大的变形.
Journal of The Institution of Engineers (India): Series A, 2019
The paper presents the effect of untreated and chemically treated coir geotextiles on the interfa... more The paper presents the effect of untreated and chemically treated coir geotextiles on the interface properties of sand-/clay-coir geotextile interface. For this purpose, two woven and two non-woven coir geotextiles were used. The chemicals used for the treatment of coir geotextiles were p-aminophenol, sodium periodate and sodium hydroxide. The results indicated that the adhesion at the clay-/sand-coir geotextile interface with treated woven coir geotextiles was higher in comparison with the untreated woven coir geotextiles. The interface friction angle at the clay-/sand-coir geotextile interface with the treated woven coir geotextiles was less in comparison with the untreated woven coir geotextiles. The adhesion as well as interface friction angle at the clay-/sand-coir geotextile interface with treated non-woven coir geotextiles was higher in comparison with the untreated non-woven coir geotextiles. For the sand-coir geotextile interface with untreated non-woven coir geotextiles, the observed adhesion as well as interface friction angle was higher in comparison with the clay-coir geotextile interface. For the sand-coir geotextile interface with untreated woven coir geotextiles, the observed adhesion was less in comparison with the clay-coir geotextile interface, whereas the interface friction angle was higher for the sand-coir geotextile interface in comparison with the clay-coir geotextile interface.
Effect of diesel and gasoline on the properties of sands — a comparative study
International Journal of Geotechnical Engineering, 2011
... Ghaly, AM, (2001). ... Shin, EC, Omar, MT, Tahmaz, AA, Das, BM, (2002).Shear strength and hy... more ... Ghaly, AM, (2001). ... Shin, EC, Omar, MT, Tahmaz, AA, Das, BM, (2002).Shear strength and hydraulic conductivity of oil-contaminated sand. In: de Mello, LG, Almeida, M. (Eds.), Proceedings of the Fourth International Congress on Environmental Geotechnics, Rio de Janeiro ...
Estimation of bearing capacity of shallow footings on layered sand using finite elements analysis
Journal of Engineering, Design and Technology, 2022
Purpose This paper aims to estimate the bearing capacity of a surface strip and circular footings... more Purpose This paper aims to estimate the bearing capacity of a surface strip and circular footings lying on layered sand using numerical limit analysis. Design/methodology/approach Lower and upper bound limit analysis, as well as finite elements and second-order conic programming (SOCP), are used in this analysis. The yield criterion of Mohr-Coulomb is used to model soil behavior. Using this technique, stringent lower and upper bounds on ultimate bearing capacity can be achieved by assuming an associated flow law. Findings The obtained results indicate that the exact collapse load is typically being bracketed to within 6% about a mean of both the bounds. The obtained results are compared with the existing literature wherever applicable. Originality/value To the best of the authors’ knowledge, no study has used lower and upper bound limit analysis, as well as finite elements and SOCP, to estimate the bearing capacity of a surface strip and circular footings lying on layered sand.
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Papers by rakesh kumar Dutta