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三峡库区复活型滑坡多为粘质土型,自三峡水库蓄水以来,在降雨及库水的周期性作用下,该类滑坡均出现不同程度的拉裂现象。由于库水位上升,可能导致该类滑坡稳定性降低,处于临界状态,这类滑坡是否失稳,将取决于大气降雨。常规数值模拟时,一般默认滑坡土体为各向同性渗透材料,没有考虑裂隙的优势渗流,其结果通常与实际情况不符。本项研究考虑采用各向异性渗透材料对滑坡在降雨作用下进行渗流场及位移场的模拟,并与常规模拟及监测数据进行对比。发现考虑材料各向异性渗透系数时,滑坡体孔压分布及位移变化均与实际情况接近,说明了该简化优势流模型的可靠性。
The resurrection landslide in the Three Gorges reservoir area is mostly of clayey soil type. Since the Three Gorges reservoir has been impounding, the landslides of this kind have different degrees of cracking and cracking under the periodic effect of rainfall and reservoir water. As the reservoir water level rise, may lead to the stability of such landslides reduce the critical state of such landslides is not stable, will depend on the rainfall. Conventional numerical simulation, the general default landslide soil isotropic material, did not take into account the advantages of fracture seepage, the results usually do not match with the actual situation. In this study, we consider the simulation of seepage field and displacement field of landslide under the action of rainfall with anisotropic seepage material, and compare with the conventional simulation and monitoring data. It is found that the pore pressure distribution and displacement change of the landslide body are close to the actual situation considering the material anisotropic permeability coefficient, which shows the reliability of the simplified dominance flow model.