%0 Journal Article
%A DONG Bing-yin
%A HU Rui-geng
%A SHUI Wei-hou
%A SHI Wei
%T Experimental Study on Vertical Bearing Capacity of Single Geotextile-encased Granular Column in Marine Silty Clay
%D 2019
%R 10.11988/ckyyb.20180713
%J Journal of Yangtze River Scientific Research Institute
%P 133-138
%V 36
%N 12
%X Pre-drilled geotextile-encased granular columns were installed in silty clay. The reinforcement effect was evaluated through ultra-heavy dynamic penetration tests and plate loading tests, and the vertical bearing capacity of single geotextile-encased granular column was examined. The influence of geotextile-encased length on the vertical bearing capacity of single geotextile-encased granular column was investigated by building a finite element model of single column. Results unveiled that the characteristic value of vertical bearing capacity of single geotextile-encased granular column is about 2.4 times that of single ordinary granular column. Scale effect was found in the lateral constraint and contribution of bearing capacity to the column: the improvement to lateral constraint and bearing capacity  weakens and the granular stone works as main component when the diameter of column is 1 200 mm with geotextile type of HP470. The compactness of granular stone exerts a remarkable influence on vertical bearing capacity in the depth ranging from (2-3)<i>d</i> (<i>d</i> represents diameter of column). Through dynamic compaction (3 000 kN·m) on granular stones in the depth range from column top to 3<i>d</i>, the vertical bearing capacity of the column increased by about 4.1 times. Under the requisite of guaranteeing bearing capacity and deformation, we suggest 6<i>d</i> as the minimum encased length (geotextile type of HP470) when vertical load is 200-250 kPa.
%U http://ckyyb.crsri.cn/EN/10.11988/ckyyb.20180713