水库蓄水初期库岸边坡变形特征  

Deformation Characteristics of Reservoir Slopes in the Initial Impoundment Period

作　　者：薛秀[1] 李凯[1] 黄秋香[1] 徐博[1] 

机构地区：[1]成都理工大学/地质灾害防治与地质环境保护国家重点实验室,四川成都610059

出　　处：《山地学报》2016年第3期323-330,共8页Mountain Research

基　　金：国家自然科学基金4140020411~~

摘　　要：为研究水库蓄水过程中库岸边坡的变形特征,以雅砻江某水电站库岸边坡为例,充分利用第一手监测资料进行变形分析,另外再结合Geo-Studio程序(Slope/W和Seep/W耦合)对边坡地下水渗流情况及稳定性进行计算,结果表明:库水位上升初期,库水向坡体由表及里、由前缘向后缘入渗,坡体变形滞后于库水位变化;随着库水位快速上升,库水来不及入渗到坡体内部,故先是库水对坡脚的压重起主要作用,坡体稳定性增大,后期库水入渗到坡体后,库水对岸坡岩土体力学参数弱化起主要作用,稳定性降低;在整个蓄水过程中,坡体变形以蠕变为主。结合数值模拟和变形分析可知,蓄水会导致研究区稳定性降低,但该变化在允许变形范围内,边坡最终仍处于稳定状态。With the rise of groundwater level, the stress field of reservoir slopes will adjust during reservoir filling. Coupled with the weakening role of water in the rock mass slopes, the slope may slide. To research on the deforma- tion characteristics of reservoir slopes during reservoir filling, in this paper, a reservoir slope of large hydro-power station on the Yalong River in western Sichuan of China was discussed here. It used firsthand monitoring data in the region to analyze the deformation characteristics of the reservoir slopes, and combined the Geo - Studio （ Slope/W ＆ Seep/W） to analyze ground-water seepage and slope stability. It turned out that reservoir water infiltration in to the slope was a process from its out to core, from the leading edge to the rear in early days, so the deformation of reservoir slopes had lagged behind the reservoir water level. As the reservoir level rose, there wasnl enough time to infiltrate into the slopes, so weights of reservoir level at the foot of slope increased the factor of safety. When water infiltrated into the slopes, the weakening action of water decreased the factor of safety. The slope kept creep during this process. Numerical simulation and deformation analysis showed that water storage can reduce stability of slope. However, its deformation should be controlled within tolerances and was still in a stable state.

关 键 词：水库蓄水 库岸边坡 变形特征 稳定性 

分 类 号：P642.2[天文地球—工程地质学]