锦屏Ⅰ级水电站解放沟左岸边坡倾倒变形机制的3D数值模拟

Analyses of 3D numerical simulation of toppling deformation mechanism of Jiefanggou left slope in Jingping Step 1 hydropower station

为研究某一边坡的变形机制问题 ,采用 3D -σ模拟了地质体演化机理 ,用FLAC - 3D模拟与3D -σ的模拟结果相互验证 ;获得了河谷下切过程中边坡的变形特征 ,揭示左岸边坡的变形破裂形成机制。经分析得出如下主要结论 :从地应力的角度分析河谷边坡变形的成因机制是切实可行的方法 ;坡体的卸荷促进弯曲倾倒变形的进行 ,并为它划定界限 ;作者提出的解放沟左岸边坡变形的成因机制是合理的 ;卸荷回弹也是促进倾内层状体边坡中深层弯曲倾倒变形进行的起始因素 ,并为变形划定界限 ;倾倒变形的破坏面是双折线型的。

The paper discussed the problem of the slope's deformation mechanism.It adopted 3D-σ limit elements numerical modeling and FLAC-3D numerical modeling.The purpose of 3D-σ modeling was the knowledge of slope evolvement mechanism.The purpose of FLAC-3D had two.The one of them was reciprocally validate results between the 3D-σ and FLAC-3D,and the other got deformation characters in cutting valley to understand the deformation cracking mechanism of left slope.The paper gained some conclusions by analyzing.The way that deformation mechanism of valley slope is analyzed from the point of terra stress is feasible. The unloading of slope accelerated the developing of bending and toppling deformation and drew a line of demarcation. The deformation mechanism of Jiefanggou left slope that is explained by author is rational. The unloading of slope also accelerated the developing of deep bending and toppling deformation and drew a line of demarcation too. The figure of breakage face of toppling deformation is double fold line.