Shear Response of Pervious Concrete Column Improved Ground
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TECHNICAL NOTE
Shear Response of Pervious Concrete Column Improved Ground R. S. V. Rashma1
•
R. Shivashankar1 • B. R. Jayalekshmi1
Received: 26 March 2020 / Accepted: 16 November 2020 Ó Indian Geotechnical Society 2020
Abstract This study deals with numerical analysis of the shearing resistances of pervious concrete column improved ground vis-a`-vis ordinary stone column improved ground. Analysis is done by numerically simulating a large shear test model, representing pervious concrete column improved ground. The parameters varied in this study are the depth of pervious concrete column/pile, floating and end-bearing piles, diameter, single pile and two-pile group and distance from the edge of loading area in the model. The shear response of improved ground is quantified by the applied strain controlled vertical load to the entire width of large shear test model that induces shear movements within the tank model. It is observed that the pervious concrete column improved ground shows better shear performance than ordinary stone column improved ground. It is also found that the pervious concrete column undergoes very small lateral deflections. It is also observed that more number of pervious concrete columns, and closer they are to the loaded area, better is the shear performance. Keywords Pervious concrete column Ground improvement Stone columns Shear strength Large shear tests Finite element modelling
& R. S. V. Rashma [email protected]; [email protected] R. Shivashankar [email protected]; [email protected] B. R. Jayalekshmi [email protected]; [email protected] 1
Department of Civil Engineering, National Institute of Technology, Karnataka, Surathkal, Mangalore, India
Introduction Stone columns are widely used for improving the load carrying capacity and reducing settlements of weak soils. In column supported embankment system, the columns placed in close proximity to toe of the embankment experience predominant shear loading when compared to columns placed near to the centreline of the embankment. Studies related to shear resistance of stone column improved ground are limited in literature. Literature review of related studies is summarized as follows. The shear strength of improved ground is determined in the laboratories by conducting direct shear tests using boxes of standard size 305 mm 9 305 mm as per ASTM standard D-3080 [1]. Murugesan and Rajagopal [2] conducted laboratory direct shear tests on unreinforced clay, ordinary stone column reinforced clay and geo-synthetic encased stone column reinforced clay for varying normal pressures of 0.6 kPa, 13.3 kPa and 75 kPa. They found that the stone column improved clay sheared along the horizontal failure plane of direct shear test offering almost zero resistance to shear, in the same manner as that of unimproved clay. They also found that the geo-synthetic encased stone column improved ground behaved like a semi-rigid pile resisting shear failure. Mohapatra and Rajagopal [3, 4] and Mohapatra et al. [5–7] perfor
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