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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.
Taking the I-slide of Majiagou landslide in Zigui County of the Three Gorges Reservoir area as an example, in order to study its deformation, failure and stability under the condition of water level rise and rainfall in the reservoir, frame-type model test was conducted with reference to 1:40 similarity ratio Aiming at the consistency of the landslide stability coefficient before and after the model generalization, by changing the geometry of the sliding body and the sliding belt before the anti-slide pile in the test frame of 2.0m × 1.0m × 1.5m, The geomechanical model with consistent stress boundary conditions was studied.After the generalization of the landslide pile front boundary thrust and the study area back-boundary thrust fitting, the reduction coefficient corresponding to the actual landslide boundary thrust at different water levels was obtained.Through adjusting the water level The numerical simulation results show that the rate of change of the water level in the landslide model is 0.7m / d, and the water level rises and falls in the range of 183 ~ 204m to meet the actual landslide water level of 145 ~ 175m between the changes in the situation, which also validated the rationality of the landslide generalized model.