摘要
以西藏俄米水电站坝址上游500 m处滑坡体为研究对象,针对库水位上升时滑坡体的变化,利用二维有限元模拟软件Geo-Studio中的SLOPE/W和SEEP/W模块来对滑坡体进行渗流运动数值模拟和稳定性分析。研究结果表明:随着库水位的上升,基岩的浸润线较滑体的浸润线滞后,且在2条浸润线交界面处出现明显的突变区,滑坡总水头等值线高于基岩;坡体内最大水平水力梯度分布在滑坡体与基岩的交界面,而滑坡体内的最大水平梯度分布在坡体表面并表现出由坡体表面向坡内水平水力梯度呈降低环;水平流速等值线在浸润线以下较稀疏,而在浸润线以上较密集,在滑坡体内由底部向上水平流速呈增大环;滑坡稳定性系数表现为先减小后增大,当库水位比水库初始地下水位高150 m时,稳定性系数最小。
Taking Dibet Emi hydropower station dam upstream of the 500 m landslide as the research object, ac- cording to the change of the reservoir water level when the landslide body changes, by using two - dimensional fi- nite element simulation software Geo -Studio in SLOPE/W and SEEP/W module, landslide seepage numerical simulation and stability analysis were conducted. The results show that with the increase of the reservoir water level, the bedrock infiltration line is lagged compared with slippery body infiltration line, and in the two invasion line interface appear obvious mutant area, and total head contour is above the bedrock landslide. The maximum horizontal hydraulic gradient of a slope distributes at the interface of the landslide and bedrock, but the maximum horizontal gradient of the landslide body is located in the surface of the slope and presents depressed loop from the surface of slope to the inner of the horizontal hydraulic gradient. Horizontal velocity contour is sparse below the saturation line, but dense up the saturation line, and horizontal velocity increases gradually in the landslide body from bottom to top. The landslide stability coefficient decreases first then increases, and when the reservoir water level is 150 m higher than the initial ground water level of reservoir, the stability coefficient is minimum.
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2013年第3期76-81,共6页
Journal of Railway Science and Engineering
关键词
变形体滑坡
库水位
饱和一非饱和理论
渗流场
稳定性
deformation landslide
reservoir water level
saturated - unsaturated theory
seepage field
stability
