深厚覆盖层地基高土石围堰应力变形敏感性分析

采用二维非线性有限元方法分析深厚覆盖层地基高土石围堰在典型工况下的应力变形特性。针对不同的覆盖层及防渗墙物理力学参数,进行了围堰应力变形的敏感性分析。结果表明:在围堰蓄水期,防渗墙底部出现了较大的拉应力;防渗墙弹性模量变化对堰体的水平位移及垂直位移影响不大,但对堰体的大、小主应力的影响较为明显;防渗墙与两侧土体之间的内摩擦角对堰体的水平位移及垂直位移影响不大,但对堰体的大、小主应力会产生一定的影响。

Analysis of stress and deformation sensitivity of high earth-rock cofferdam on deep overburden foundation

This paper used two-dimensional nonlinear finite element method to analyze the stress-deformation behavior of high earth-rock cofferdam on deep overburden foundation in two typical conditions. It also analyzed the sensitivity of stress and deformation of high earth-rock cofferdam aiming at different layers of deep overburden foundation and different physical and mechanical parameters of cut-off wall. The results showed that in the impoundment period, the larger tension stress appeared at the bottom of the cutoff-wall;the elastic modulus changes did not largely affect the horizontal and vertical displacement of the cutoff-wall, but obviously affect the large and small principal stress of cofferdam body. The internal friction angle between cut-off wall and both sides of soil has little influence on horizontal and vertical displacement but has certain influence on the large and small principal stress.