摘要
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。
Many landslides in Three Gorges Reservoir area belong to those of clayey soil type,Since the impoundment of the Three Gorges Reservoir,in the periodic effect of rainfall and reservoir water,crack phenomenon appeared in this kind of landslide in different degree. As the water level rises,it may lead to reduction of the stability of these landslides,which are in a critical state,the stability of these landslides will depend on the atmospheric rainfall. In a conventional numerical simulation,in general,it is acquiesced in the simulation of the permeability of these landslides,the soil material is taken as isotropic,the results are often inconsistent with the actual situation. The present study uses anisotropic permeability materials to have a landslide simulation about seepage field and displacement field under rainfall,Compared with conventional simulation and monitoring data,it discovers that with considering the anisotropy permeability coefficient of material,the distribution of pore pressure and displacement of the landslide are close to those in the actual situation,it demonstrates the reliability of simplified preferential flow method.
出处
《地下空间与工程学报》
CSCD
北大核心
2015年第4期1047-1052,1065,共7页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金面上项目(41372359)
关键词
优势流
降雨入渗
滑坡监测
数值模拟
preferential flow
rainfall infiltration
landslide monitoring
numerical simulation
