变形参数对土坡稳定安全系数的影响

利用有限元极限平衡法对土坡在不同变形条件下稳定性的变化规律进行研究。对3种不同填筑情况、不同土质的土坡进行稳定性计算分析,土体本构模型分别采用线弹性模型和邓肯-张E-ν非线性弹性模型。计算中,分别变化了土体的弹性模量(或参数K)、泊松比(或参数G)以及内摩擦角。结果表明:变形参数对土坡稳定安全系数有一定影响,弹性模量对土坡稳定安全系数几乎没有影响,而泊松比对土坡稳定安全系数影响较大;考虑变形影响的有限元法用于土坡稳定性分析具有一定优势。

Effect of deformation parameters on safety factor of slope stability

The finite element method(FEM) was employed to study the variation rules of stability of soil slopes under different deformation conditions.The stability of 3 kinds of slopes with different filling situations and soils was calculated and analyzed.The constitutive models for soil slopes employed the linearly elastic model and Duncan-Chang's E-ν model with various values of Young's modulus(or parameter K),Poisson's ratio(or parameter G) and internal friction angle.The calculated results show that the deformation parameters have certain influence on the safety factor of soil slopes.The Young's modulus almost has no influence on the safety factor,but the Poisson's ratio has much influence on it.The FEM considering deformation of soil slopes is of superiority in the analysis of slope stability.