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Indian Institute of Technology (IIT) Roorkee 
A method for improving the liquefaction resistance of pond ash 
B.K. Maheshwari, Swami Saran, D. K. Paula, S. Mukherjee, M.L. Sharma, Subodh Jain, H.P. Singa and N.P. Aterkar 
Indian Institute of Technology (IIT) Roorkee 
Application type:
Applied - 2010-04-06 
Application Number:
Applied at:
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Indian Institute of Technology (IIT) Roorkee 
This invention relates to a method for improving the liquefaction resistance of pond ash deposits using stone-sand columns comprising essentially the steps, providing a device having a casing pipe with a detachable shoe and a hammer; driving the casing pipe with detachable shoe at the bottom of the deposit by the hammer at a desired location to create a hole; filling the casing pipe up to a first depth with a desired back fill material; withdrawing or lifting the casing pipe from the bottom of the surface; compacting the back fill material inside the hole by adapting the dynamic compacting method; repeating the steps (b) to (e) for achieving a maximum compaction; filling the casing pipe up to a second depth with the desired back fill material; and repeating the steps (b) to (g) layer wise till the compaction piles are installed up to the existing ground level. Wherein the stone sand columns decrease the time for building up of maximum pore pressure, the duration for which maximum pore pressure stays and total time for dissipation of pore water pressure resulting in decrease in drainage path, thus reducing the liquefaction potential. 

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