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Performance of Stone Columns in Soft Clay - A Comparative Study of Bearing Capacity of Soil Estimated using IS Code Method, Actual Field Load Tests and Observations from Numerical Model - A Case Study
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Abstract:

Assam cancer care foundation (ACCF) proposed the construction of hospitals and related facilities across 18 locations in the state of Assam-India. In this paper, study on Performance of stone columns in soft clayey soils at Jorhat site, one among the 18 locations is discussed. At this site, Ground improvement by Vibro-stone columns of 900mm diameter were installed at spacing of 2.0m C/C in square pattern up to a depth of 9m below founding level by Dry-bottom feed vibro-displacement method to improve the safe bearing capacity of in situ soil from 70 Kpa to 140 Kpa to support hospital building, LINAC block and service building, by method of reinforcing the ground as they provide increased bearing capacity and reduce the foundation settlements. Stone columns were designed based on guidelines given in IS-15284(Part-I)-2013. The reliability of any method can be justified based on their ability to predict safe bearing capacities. Design is validated by two initial field load tests (single & group column test) and three routine load tests (single column test) as per guidelines given in IS code. Results showed 20 % higher than estimated safe bearing capacities. Numerical modeling was also performed using PLAXIS -2D program. Deformations & stability checked using software and results were compared with actual settlements estimated empirically along with the field load tests. Comparison of Results shows theoretical, field load test results holds good with Numerical Analysis Results
VENKATAKRISHNAIAH; VENKATAKRISHNAIAH YEDDALA
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