皖南山区阳台古滑坡稳定性数值模拟研究

Numerical simulation of stability of the Yangtai ancient landslide in the mountain area of south Anhui

以皖南山区阳台古滑坡堆积体为例,在工程地质勘察的基础上,运用三维有限差分数值模拟结合极限平衡理论对其稳定性进行了详细研究。结果表明:该滑坡整体处于稳定状态,但在暴雨的影响下,其前缘可能出现浅层的蠕滑-拉裂破坏,坡体中上部可能出现较深层的蠕动变形-拉裂破坏。对于这类滑坡堆积体的防治应当采用多级治理措施分别控制其变形部位,同时疏通截排水系统。

A large-scale landslide tends to generate multistage local sliding because of its slope shape. Therefore,it is of important significance in selecting the control measures to study the failure mode and the landslide stability evaluation. In this paper,the Yangtai ancient landslide is considered as a case to examine the stability through numerical simulation. Based on the engineering geological survey of the Yangtai ancient landslide,the stability is analyzed in detail by a combination of the 3-D finite difference numerical simulation and the limit equilibrium theory. The results indicate that the landslide is in a steady state. However,shallow creep and tensile failure may occur in the leading edge of the landslide and the deeper creep deformation and failure may exist in the upper slope under the influence of the torrential rain. For the prevention and treatment of this kind of landslide,the muti-level governance measures should be adopted to control the deformation and dredge drainage system.