Bearing Capacity of Interfered Adjacent Strip Footings on Granular Bed Overlying Soft Clay: An Analytical Approach
In the present paper, the interference effects on bearing capacity of two and three closely spaced strip footings resting on granular bed overlying clay are being studied. A simple analytical model is proposed to predict the load-carrying capacity and the interference factor of an interfered footing, when adjacent strip footings are optimally placed on the surface of a Granular Bed (GB) overlying clay and both the footings are simultaneously loaded. A punching shear failure mechanism is envisaged in the analytical model. The load-carrying capacity of the footing is taken as the sum of total shearing resistances along the two vertical planes through the edges of the strip footing in the upper granular layer and the load-carrying capacity of the soft clay beneath the GB. Insights gained from finite element simulations are used to develop the new modified punching shear model for interfering footing. Bearing capacity can be easily calculated by using the proposed punching shear model for interfering footing. The analytical model is validated with numerical analyses and previous experimental results and found to be in reasonably good agreement. The influence of different parameters such as granular bed thickness, width of footing, number of footings are carried out in this study.
Full Text: PDF
Shivashankar, R., M. R. Madhav, and N. Miura. "Reinforced granular beds overlying soft clay." In Proceedings of 11th South East Asian Geotechnical Conference, Singapore, (1993): 409-414.
Rethaliya, R. P., and A. K. Verma. "Strip footing on sand overlying soft clay with geotextile interface." Indian Geotech J 39, no. 3 (2009): 271-287.
Terzaghi, Karl, Ralph B. Peck, and Gholamreza Mesri. “Soil mechanics in engineering practice.” John Wiley & Sons, (1996).
Meyerhof, G. G. “Ultimate Bearing Capacity of Footings on Sand Layer Overlying Clay.” Canadian Geotechnical Journal 11, no. 2 (May 1, 1974): 223–229. doi:10.1139/t74-018.
Meyerhof, G. G., and A. M. Hanna. “Ultimate Bearing Capacity of Foundations on Layered Soils under Inclined Load.” Canadian Geotechnical Journal 15, no. 4 (November 1, 1978): 565–572. doi:10.1139/t78-060.
Okamura, Mitsu, Jiro Takemura, and Tsutomu Kimura. “Centrifuge Model Tests on Bearing Capacity and Deformation of Sand Layer Overlying Clay.” Soils and Foundations 37, no. 1 (March 1997): 73–88. doi:10.3208/sandf.37.73.
Okamura, Mitsu, Jiro Takemura, and Tsutomu Kimura. “Bearing Capacity Predictions of Sand Overlying Clay Based on Limit Equilibrium Methods.” Soils and Foundations 38, no. 1 (March 1998): 181–194. doi:10.3208/sandf.38.181.
Kumar, Jyant, and Manash Chakraborty. “Bearing Capacity of a Circular Foundation on Layered Sand–clay Media.” Soils and Foundations 55, no. 5 (October 2015): 1058–1068. doi:10.1016/j.sandf.2015.09.008.
Saha Roy, S., and K. Deb. “Effects of Aspect Ratio of Footings on Bearing Capacity for Geogrid-Reinforced Sand over Soft Soil.” Geosynthetics International 24, no. 4 (August 2017): 362–382. doi:10.1680/jgein.17.00008.
Salimi Eshkevari, Seyednima, Andrew J. Abbo, and George Kouretzis. “Bearing Capacity of Strip Footings on Sand over Clay.” Canadian Geotechnical Journal 56, no. 5 (May 2019): 699–709. doi:10.1139/cgj-2017-0489.
Yang, Chaowei, Zhiren Zhu, and Yao Xiao. “Bearing Capacity of Ring Foundations on Sand Overlying Clay.” Applied Sciences 10, no. 13 (July 7, 2020): 4675. doi:10.3390/app10134675.
Kumar, Prateek, and Manash Chakraborty. “Bearing Capacity of Shallow Circular and Strip Foundation Resting on Two Layered Clays.” Advances in Computer Methods and Geomechanics (2020): 579–592. doi:10.1007/978-981-15-0886-8_47.
Panwar, V., and R.K. Dutta. “Numerical Study of Ultimate Bearing Capacity of Rectangular Footing on Layered Sand.” Journal of Achievements in Materials and Manufacturing Engineering 1, no. 101 (July 1, 2020): 15–26. doi:10.5604/01.3001.0014.4087.
Stuart, J. G. “Interference between Foundations, with Special Reference to Surface Footings in Sand.” Géotechnique 12, no. 1 (March 1962): 15–22. doi:10.1680/geot.19220.127.116.11.
Das, Braja M., and Said Larbi-Cherif. “Bearing Capacity of Two Closely-Spaced Shallow Foundations on Sand.” Soils and Foundations 23, no. 1 (March 1983): 1–7. doi:10.3208/sandf1972.23.1.
Kumar, Arvind, and Swami Saran. “Closely Spaced Footings on Geogrid-Reinforced Sand.” Journal of Geotechnical and Geoenvironmental Engineering 129, no. 7 (July 2003): 660–664. doi:10.1061/(asce)1090-0241(2003)129:7(660).
Kumar, Jyant, and Priyanka Ghosh. “Upper Bound Limit Analysis for Finding Interference Effect of Two nearby Strip Footings on Sand.” Geotechnical and Geological Engineering 25, no. 5 (May 11, 2007): 499–507. doi:10.1007/s10706-007-9124-9.
Ghazavi, Mahmoud, and Arash Alimardani Lavasan. “Interference Effect of Shallow Foundations Constructed on Sand Reinforced with Geosynthetics.” Geotextiles and Geomembranes 26, no. 5 (October 2008): 404–415. doi:10.1016/j.geotexmem.2008.02.003.
Kumar, Jyant, and Manas Kumar Bhoi. “Interference of Two Closely Spaced Strip Footings on Sand Using Model Tests.” Journal of Geotechnical and Geoenvironmental Engineering 135, no. 4 (April 2009): 595–604. doi:10.1061/(asce)1090-0241(2009)135:4(595).
Bezih, Kamel, Alaa Chateauneuf, and Rafik Demagh. “Effect of Long-Term Soil Deformations on RC Structures Including Soil-Structure Interaction.” Civil Engineering Journal 6, no. 12 (November 30, 2020): 2290–2311. doi:10.28991/cej-2020-03091618.
Anaswara, S., G. S. Lakshmy, and R. Shivashankar. “Interference Studies of Adjacent Strip Footings on Unreinforced and Reinforced Sands.” Transportation Infrastructure Geotechnology 7, no. 4 (March 18, 2020): 535–561. doi:10.1007/s40515-020-00104-z.
Das, P. E., F. AS, M. Braja, Vijay K. Puri, and Boon K. Neo. "Interference effects between two surface footings on layered soil." Transportation Research Record 1406 (1993).
Ghosh, Priyanka, and S. Kumar. “Interference Effect of Two nearby Strip Surface Footings on Cohesionless Layered Soil.” International Journal of Geotechnical Engineering 5, no. 1 (January 2011): 87–94. doi:10.3328/ijge.2011.05.01.87-94.
Srinivasan, V., and Priyanka Ghosh. “Experimental Investigation on Interaction Problem of Two nearby Circular Footings on Layered Cohesionless Soil.” Geomechanics and Geoengineering 8, no. 2 (July 16, 2012): 97–106. doi:10.1080/17486025.2012.695401.
Saha Roy, Subinay, and Kousik Deb. “Interference Effect of Closely Spaced Footings Resting on Granular Fill over Soft Clay.” International Journal of Geomechanics 19, no. 1 (January 2019): 04018181. doi:10.1061/(asce)gm.1943-5622.0001324.
Zheng, Gang, Jiapeng Zhao, and Haizuo Zhou. “Ultimate Bearing Capacity of Two Interfering Strip Footings on Sand Overlying Clay.” Acta Geotechnica 16, no. 7 (February 11, 2021): 2301–2311. doi:10.1007/s11440-021-01153-5.
Bowles, J. E. “Foundation Analysis and Design”, McGraw-Hill Education (India) Pvt. ltd., 5th Ed. (2012).
IS (Indian Standard) 6403-1981. Code of Practice for determination of bearing capacity of shallow foundation, Bureau of Indian Standards.
Anaswara, S., and R. Shivashankar. “Study on Behaviour of Two Adjacent Strip Footings on Granular Bed Overlying Clay with a Void.” Transportation Infrastructure Geotechnology 7, no. 3 (July 30, 2020): 461–477. doi:10.1007/s40515-020-00122-x.
Anaswara, S., and R. Shivashankar. “Study on Behaviour of Two Adjacent Strip Footings on Unreinforced/Reinforced Granular Bed Overlying Clay with Voids.” Geotechnical and Geological Engineering 39, no. 3 (October 12, 2020): 1831–1848. doi:10.1007/s10706-020-01590-1.
Kishida, Hideaki. “Ultimate Bearing Capacity of Piles Driven into Loose Sand.” Soils and Foundations 7, no. 3 (1967): 20–29. doi:10.3208/sandf1960.7.3_20.
Love, J. P., H. J. Burd, G. W. E. Milligan, and G. T. Houlsby. “Analytical and Model Studies of Reinforcement of a Layer of Granular Fill on a Soft Clay Subgrade.” Canadian Geotechnical Journal 24, no. 4 (November 1, 1987): 611–622. doi:10.1139/t87-075.
- There are currently no refbacks.
Copyright (c) 2021 R Shivashankar, S ANASWARA
This work is licensed under a Creative Commons Attribution 4.0 International License.