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Response of stone column-improved ground under c-φ soil embankment

机译：c-φ土堤下石柱改良地基的响应

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摘要

Problems with stone column-supported embankments are often addressed considering the pure granular soil properties of the embankment material. In practice, however, the embankment material may contain a certain percentage of fines which makes the material c-phi in nature. In the present paper, experimental and 3D numerical studies are conducted to investigate the effect of the fines content present in the embankment soil on the response of a stone column-improved ground. The numerical study is carried out using the finite difference software package FLAC(3D). The time-dependent behavior of the improved soil is modeled. It is observed that an increase in the fines content in the embankment soil brings about a decrease in the stress concentration ratio and an increase in the vertical displacement and the pore pressure in the soft soil. However, the vertical displacement of the soft soil does not change significantly above a fines content of 20%. The lateral displacement of the stone column increases at the top with an increase in the fines content and the point of the maximum lateral displacement shifts in the downward direction. It is also observed that the differential settlement increases at the ground level as well as at the embankment top with an increase in the quantity of fines in the embankment soil. Thus, the critical height of the embankment (a height where no differential settlement occurs on the embankment surface) increases due to the increase in the fines content. (C) 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
机译：考虑到路堤材料的纯粒状土壤特性，经常要解决石柱支撑路堤的问题。然而，在实践中，路堤材料可能包含一定百分比的细粉，这使得该材料自然具有c-phi的性质。在本文中，进行了实验和3D数值研究，以研究路堤土壤中存在的细粉含量对石柱改良地面响应的影响。数值研究是使用有限差分软件包FLAC（3D）进行的。对改良土壤的时间依赖性行为进行了建模。可以看出，路堤土中细粒含量的增加导致应力集中比降低，软土中的竖向位移和孔隙压力增大。但是，在细粉含量超过20％时，软土的垂直位移不会发生明显变化。随着细粉含量的增加，石柱的横向位移在顶部增加，并且最大横向位移的点沿向下方向移动。还观察到，随着路堤土壤中细粒数量的增加，地面和路堤顶部的差异沉降增加。因此，由于细粉含量的增加，路堤的临界高度（在路堤表面上没有差异沉降的高度）增加。 （C）2019年由Elsevier B.V.代表日本岩土工程学会制作和主持。

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