Abstract:
The most critical challenges for any large size storage structures to be constructed on soft compressible soils are bearing capacity and consolidation settlements. Consolidation is the time dependent phenomena, as expulsion of water from soil voids on application of external load will take longer period. It is mainly influenced by soil consistency, permeability, thickness of compressible stratum and presence of free draining layers. This study deals with the foundation solution of a large size Mounded Storage Vessel (MSV) with loading intensity more than 150 kPa to be constructed on thick compressible stratum whose major challenges are being the consolidation settlements and inadequate bearing capacity. Hence to cater the challenges, foundation solution using vibro stone columns has been adopted as an effective ground improvement technique and further to keep settlements within the permissible limits, preloading technique with 60% of actual loading intensity is considered additionally. The consolidation analysis of stone column reinforced foundations is carried based on the method given by Han and Ye (2001). The Ground settlements during preloading period is being closely monitored with proper instrumentations. The quality of the stone columns was ensured by real time quality control measures and the performance of the stone columns shall be ensured by vertical load tests.
Keywords: Consolidation; Vibro stone columns; preloading; soft soils.
Abstract: Theme 4