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Direct shear tests on geosynthetic-encased granular columns
Abstract The behaviour of geosynthetic-encased granular columns (EGC) under vertical loads is reasonably well understood. To date, very little research has been done to understand the behaviour of EGCs subjected to lateral loads. The main objective of this paper is to quantify the effect of encasement on the lateral load capacity of EGCs. Several direct shear tests are performed on granular columns with and without encasement in a shear box having plan dimensions of 305 × 305 mm. Tests are conducted at different normal pressures varying from 15 kPa to 75 kPa. Two different diameters of columns, three types of encasements and three different plan configurations are studied in this research work. The results from these tests are discussed in terms of the increase in the shear strength due to geosynthetic encasement and the strength envelopes for understanding the influence of the encasement. Different types of failures observed in the granular columns (with and without encasement) subjected to lateral load are also discussed.
Direct shear tests on geosynthetic-encased granular columns
Abstract The behaviour of geosynthetic-encased granular columns (EGC) under vertical loads is reasonably well understood. To date, very little research has been done to understand the behaviour of EGCs subjected to lateral loads. The main objective of this paper is to quantify the effect of encasement on the lateral load capacity of EGCs. Several direct shear tests are performed on granular columns with and without encasement in a shear box having plan dimensions of 305 × 305 mm. Tests are conducted at different normal pressures varying from 15 kPa to 75 kPa. Two different diameters of columns, three types of encasements and three different plan configurations are studied in this research work. The results from these tests are discussed in terms of the increase in the shear strength due to geosynthetic encasement and the strength envelopes for understanding the influence of the encasement. Different types of failures observed in the granular columns (with and without encasement) subjected to lateral load are also discussed.
Direct shear tests on geosynthetic-encased granular columns
Mohapatra, Sunil Ranjan (author) / Rajagopal, K. (author) / Sharma, Jitendra (author)
Geotextiles and Geomembranes ; 44 ; 396-405
2016-01-14
10 pages
Article (Journal)
Electronic Resource
English
Geosynthetics , Granular column , Geosynthetic encasement , Soft clay , Lateral loading , Direct shear tests , A<inf>r</inf> , Area replacement ratio , E1 , Woven geotextile encasement , E2 , Socks encasement , E3 , paper towel encasement , EGC , Geosynthetic Encased granular Column , LDS , Large direct shear (305 mm × 305 mm) , σ<inf>n</inf> , Applied normal pressure , OGC , Ordinary granular column (without any geosynthetic encasement) , 50C , Single 50 mm diameter granular column at centre of shear box , 100C , Single 100 mm diameter granular column at centre of shear box , 50T , 50 mm diameter granular columns in triangular arrangement (three columns) , 50S , 50 mm diameter granular columns in square arrangement (four columns)
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