三峡库区马家沟滑坡模型形态概化

以三峡库区秭归县马家沟滑坡I号滑体为例, 为研究其在库水位升降和降雨条件下的变形破坏及稳定性, 对其采用框架式模型试验, 参照1∶40相似比进行了缩放.以模型概化前后滑坡稳定性系数相一致为目的, 在2.0m×1.0m×1.5m的试验框架内, 通过改变抗滑桩前的滑体、滑带的几何形态, 建立了与研究对象应力边界条件一致的地质力学模型.概化后对滑坡桩前边界推力和研究区后边界推力进行拟合, 得出相应于实际滑坡在不同水位时边界推力的折减系数.通过调节水位的升降速率来保证在水位变化时滑坡概化前后稳定性系数等效, 数值模拟结果显示滑坡模型的水位变化速率为0.7m/d、水位在183~204m范围内升降满足模拟实际滑坡水位在145~175m间变动的情况, 从而也验证了滑坡概化后模型的合理性. 

Generalizability Metgod of Pgysical Model Sgape for Maj iagou Landslide in Tgree Gorges Reservoir Area

To study the deformation and stability in the condition of water level fluctuation and rainfall, the frame type model test was taken on the sliding body I of Majiagou landslide with a ratio of 1∶40.The shapes of sliding body and sliding zone in the front of the anti-slide pile were changed in the 2.0m×1.0m×1.5m frame to make sure that the stability coefficients were the same before and after being generalized. The reduction factors of the boundary thrust in the different water levels corresponding natural conditions were put forward. The rate of water level rise and fall was changed in order to guarantee equal stability coefficients, and the numerical simulation results show that the rate of 0.7m/d ranging from 183 to 204m is in accordance with the actual landslide, and the rationality of the model is verified.