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水库滑坡抗滑桩治理设计工作中,桩位的合理选择直接关系到工程安全和造价。以张桓候庙园区东侧滑坡为例,在分析滑坡地质条件的基础上,依据三峡水库实际运行条件进行不同桩位滑坡变形规律及稳定性变化规律的GeoStudio数值模拟研究。结果表明:①库水位上升时,滑坡前缘位移减小,后缘位移增大。滑坡前缘在水位下降和最低水位时出现位移极大值;滑坡后缘在水位上升和最高水位时出现位移极大值。②对滑坡后缘位移最有效的控制桩位为位于地面高程175 m的下滑段接近滑坡最大推力区域的桩位Ⅰ,对前缘和中部位移最有效的控制桩位是位于距滑坡剪出口130 m阻滑段的桩位Ⅱ,最优桩位是桩位Ⅱ。考虑水位波动的影响,提出了对现有抗滑桩设计的设计安全系数修正方法,为水库滑坡抗滑桩设计提供参考。
Reservoir landslide anti-slide pile management design work, a reasonable choice of the pile is directly related to project safety and cost. Taking the landslide on the east side of Zhanghuan Munmiao Park as an example, GeoStudio numerical simulation of landslide deformation and stability of different piles based on the geological conditions of landslide was conducted according to the actual operating conditions of the Three Gorges Reservoir. The results show that: (1) When the reservoir water level rises, the displacement of the landslide front decreases and the trailing edge displacement increases. The maximum value of displacement occurs when the front of landslide drops at the lowest water level and the lowest one. When the water level rises and reaches the highest water level, the trailing edge of the landslide appears the maximum displacement value. ② The most effective control pile for the landslide trailing edge displacement is the pile Ⅰ located in the maximum thrust area with a ground elevation of 175 m near the landslide. The most effective control pile for the front and middle displacements is the pile located at the exit 130 m blocking section of the pile Ⅱ, the best pile is the pile Ⅱ. Considering the influence of water level fluctuation, a method to correct design safety coefficient of existing anti-slide pile design is put forward, which can provide a reference for anti-slide pile design of reservoir landslide.