三峡库区巴东复杂斜坡系统变形机理数值模拟与稳定性研究

Numerical simulation for deformation mechanism and stability study of Badong large slope system in the Three Gorges Reservoir

三峡库区巴东斜坡系统复杂,其变形机理与稳定性研究对移民迁建和地质灾害防治具有重要意义。本文采用FLAC3D数值计算方法,对巴东复杂斜坡系统变形机理进行研究,为“重力成因论”提供了支持和佐证。从整个斜坡系统的角度,联合使用数值计算方法(FLAC3D)和极限平衡法(Sarma法),系统研究了巴东复杂斜坡系统在不同蓄水状态下不同层次的稳定性问题,结果表明斜坡系统不存在整体深层滑动的可能性;斜坡系统沿岩层界面或软弱层发生失稳的可能性较小,但赵树岭滑体和黄土坡滑体在表层滑体发生较大变形或失稳的条件下,可能导致滑坡整体复活;在水库调蓄过程中,部分滑坡表层堆积体产生变形破坏的可能性较大。另外,斜坡的表层改造可能会引起斜坡中层稳定性的恶化。

With its complexity, the deformation mechanism and stability study of Badong large slope system is very important to emigration project and geologic hazard control. FLAC^30 numerical simulation is used to research deformation mechanism of Badong large slope system, which provides support to the review of gravity genesis. In the research of slope system stability in different water table conditions, numerical simulation technique and limit equilibrium method are used from the whole slope system. The results show ： （ 1 ） the whole deep slide of slope system is impossible; （2） the probability of slope system failure along reck interface or weak layer is little, but Zhaoshuling and Huangtupo landslide maybe relive in the condition of large deformation or failure of surface landslide; （3） under the influence of reservoir water level changing, it is very possible of some surface landslide failure. Furthermore, the slope surface rebuilds maybe lead to worsen of slope system middle level stability.