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Indian Institute of Technology (IIT) Roorkee 
A method and a device to improve the strength characteristics of pond ash deposits 
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 - 2010-01-25 
Application Number:
Applied at:
Entered by:
Indian Institute of Technology (IIT) Roorkee 
The invention relates to a method to improve the strength characteristics of pond ash deposits by adapting a device capable of generating stone-sand columns, the method comprising the steps of 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; filing 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 compaction method; filing the casing pipe up to a second depth with the desired back fill material; repeating the steps (b) to (e) for achieving a maximum compaction; and repeating the steps (b) to (f) layer wise till the compaction piles are installed up to the existing ground level. 

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