变荷载下考虑三维渗流的未打穿砂井地基固结分析

›› 2011, Vol. 32 ›› Issue (S2): 127-131.

变荷载下考虑三维渗流的未打穿砂井地基固结分析

邹新军，杨眉，赵明华

湖南大学土木工程学院，长沙 410082）

收稿日期:2010-12-16 出版日期:2011-08-10 发布日期:2011-08-26
作者简介:邹新军，男，1975年生，博士，副教授，主要从事桩基础及复合地基理论与应用研究
基金资助:
国家自然科学基金项目资助（No. 50908084）；湖南省自然科学基金资助（No. 07JJ4015）

Consolidation of ground with partially penetrated sand wells considering three-dimensional seepage under time-dependent loading

ZOU Xin-jun, YANG Mei, ZHAO Ming-hua

College of Civil Engineering, Hunan University, Changsha 410082, China

Received:2010-12-16 Online:2011-08-10 Published:2011-08-26

摘要/Abstract

摘要： 为探讨未打穿砂井地基的固结特性，基于三维固结理论和叠加原理，考虑变荷载条件，将砂井打设区和下卧层土体的固结均视为三维问题，分别导出了单级线性加载条件下砂井打设区和下卧层土体的固结度解析解，由此给出了地基整体的平均固结度计算式，并引入fzero函数基于Matlab编制了相应的计算程序。算例对比分析结果表明，受加载历时影响，砂井打设区和下卧层土体的固结度都较瞬时加载有所减小，且减幅随加载历时延长而增大。同时，将下卧层土体的固结视为三维要比一维更能合理考虑径向渗流，使得地基固结度计算值与模型试验推算值吻合较好

关键词: 软基处理, 砂井, 三维固结, 固结度, 解析解

Abstract: Based on the superposition principle and three-dimensional consolidation theory, and considering time dependent loading condition, analytical solutions to calculate the consolidation degree of the subsoil section with sand wells and the underlying stratum under the condition of single grade linear loading were obtained, from which the average consolidation degree of ground was derived. Then, the calculation program by using Matlab and fzero functions was worked out to conduct the comparative analysis of engineering examples; it is shown that under the influence of loading duration, consolidation degrees of both the section with sand wells and the underlying section decrease compared to that under instantaneous loading; and this decrease extent will increase along with the extending of loading duration. Furthermore, more reasonable agreement between the calculated and measured consolidation degrees will be obtained when the consolidation of the underlying subsoil was treated as three-dimensional problem rather than one-dimensional problem, as the radial seepage could be simulated.

Key words: soft foundation treatment, sand well, three-dimensional consolidation, degree of consolidation, analytical solution

中图分类号:

TU 472

邹新军，杨眉，赵明华. 变荷载下考虑三维渗流的未打穿砂井地基固结分析[J]. , 2011, 32(S2): 127-131.

ZOU Xin-jun, YANG Mei, ZHAO Ming-hua. Consolidation of ground with partially penetrated sand wells considering three-dimensional seepage under time-dependent loading[J]. , 2011, 32(S2): 127-131.

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