土体参数对地表沉降影响的数值模拟分析

以苏州东方之门基坑工程为背景,借助FLAC程序,采用土工参数初始值,对深基坑的开挖降水所引起的坑外地表沉降,进行了数值计算。通过单因素影响分析,讨论了土体的弹性模量、粘聚力、内摩擦角、渗透系数以及剪胀角对坑外地表沉降的影响。研究表明,土体的弹性模量以及粘聚力对地表沉降的影响最为显著,土体剪胀角和渗透系数的影响最小。

Numerical simulation analysis of effects of soil parameters on ground settlement

Based on the pit of the Oriental Gate,the initial values of soil parameters were used to calculate the surrounding ground settlement induced by the deep excavation by FLAC.Through the single factor analysis,effects of the soil’s elastic modulus,cohesion force,friction angle,permeability coefficient and dilation angle on the ground settlement around the foundation pit were discussed.It was demonstrated by the analysis that the soil’s elastic modulus and cohesion force affected most the land subsidence,but affected least the permeability coefficient and dilation angle.