This experimental study aims to examine the enhancement of the bearing capacity of soft clayey soil using a stone column with composite material comprised of jute-geotextile and cane-geogrid which also helps to decrease lateral spreading. Single stone columns with a triangular pattern with center-to-center spacing of 2.5D were constructed in a soft soil bed prepared inside a fabricated steel test tank with a fixed L/D ratio of 8.4, where L and D were the length and diameter of the stone column. In one set of vertical load tests, the composite material was placed at different positions inside the stone column as a single layer such as 1.4D, 2.8D, 4.2D, 5.6D, and 7D from the top. Two more vertical load tests were conducted by placing composite material in three consecutive layers together, one at a depth of 1.4D, 2.8D, 4.2D, and another at 2.8D, 4.2D, and 5.6D. Two additional tests were performed, one with a normal stone column and the other with a composite material encased stone column. For the determination of the strength of soft soil, a plate load test was also conducted. Enhancement of the load bearing capacity with respect to the ordinary stone column for single layer were 24.42%, 34.84%, 27.27%, 21.21%, and 12.12%, respectively, and for the three-layered system were 48.80%, and 42.42%, respectively. Improvement was 106% for the encased stone column. The best result was observed to occur in a single layer system when composite material was placed at a depth of 2.8D. For a three-layered system, composite material placed together at the top three layers gives better results.

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An Experimental Study on Enhancement of Bearing Capacity of Soft Soil Using Stone Column with Composite Material of Jute-Geotextile and Cane-Geogrid

  • Balaraju Saggela,
  • Shantanu Dutta,
  • Nirmali Borthakur

摘要

This experimental study aims to examine the enhancement of the bearing capacity of soft clayey soil using a stone column with composite material comprised of jute-geotextile and cane-geogrid which also helps to decrease lateral spreading. Single stone columns with a triangular pattern with center-to-center spacing of 2.5D were constructed in a soft soil bed prepared inside a fabricated steel test tank with a fixed L/D ratio of 8.4, where L and D were the length and diameter of the stone column. In one set of vertical load tests, the composite material was placed at different positions inside the stone column as a single layer such as 1.4D, 2.8D, 4.2D, 5.6D, and 7D from the top. Two more vertical load tests were conducted by placing composite material in three consecutive layers together, one at a depth of 1.4D, 2.8D, 4.2D, and another at 2.8D, 4.2D, and 5.6D. Two additional tests were performed, one with a normal stone column and the other with a composite material encased stone column. For the determination of the strength of soft soil, a plate load test was also conducted. Enhancement of the load bearing capacity with respect to the ordinary stone column for single layer were 24.42%, 34.84%, 27.27%, 21.21%, and 12.12%, respectively, and for the three-layered system were 48.80%, and 42.42%, respectively. Improvement was 106% for the encased stone column. The best result was observed to occur in a single layer system when composite material was placed at a depth of 2.8D. For a three-layered system, composite material placed together at the top three layers gives better results.