水位下降对复杂地基重力坝深层抗滑稳定分析——以武都水库重力坝19^#坝段为例  

Deep Anti-sliding Stability Analysis of Gravity Dam Under Water Level Drawdown Condition： Case of Wudu 19^# Dam

作　　者：刘咏梅 

机构地区：[1]湖南省水利水电职业技术学院,湖南长沙410131

出　　处：《水利与建筑工程学报》2016年第4期123-126,146,共5页Journal of Water Resources and Architectural Engineering

基　　金：城市实现生态化防洪治涝措施建设探索研究(湖南教育厅13C581)

摘　　要：武都重力坝基岩地质构造复杂,对坝体深层抗滑稳定极为不利。为了研究水位下降对武都重力坝抗滑稳定性的影响,以武都水库重力坝19^#坝段为例,采用有限元法计算了坝体在库水位下降过程中的应力应变特性,重点研究坝基塑性破坏区的发展规律、坝体位移变化趋势以及坝体抗滑稳定性。结果表明：坝基塑性区主要分布在断层10f2两侧,随着上游水位的降低,塑性区的分布范围逐渐减小,重力坝和坝基发生逆时针方向的倾倒变形,坝顶最为明显;上游水位降低导致扬压力减小,坝体抗滑稳定系数增大,在死水位时稳定系数最大为3.0。说明随着库水位下降,重力坝抗滑稳定安全系数将逐渐增大。Geological structure of the foundation of Wudu gravity dam is complex,which is extremely unfavorable to the stability of the dam. In order to analyze the influence of the water level drawdown to the stability of Wudu gravity dam,this paper taking Wudu Reservoir 19^# dam as an example,and the finite element method was adopted to simulate the changing process of stress and strain characteristics under water level drawdown condition,with a special focus on the foundation of plastic failure zone development law,trend of dam displacement and dam anti slide stability of size. The results showed that the dam foundation of plastic zone were mainly distributed on both sides of the fault 10F2,with decrease of the upstream water level,plastic the distribution range decreased gradually,gravity dam and its foundation reversed clockwise toppling deformation,the crest was the most obvious; upper level reduced uplift pressure decreased with the increase of dam stability against sliding coefficient increases,stability coefficient was 3. 0 in the dead water level. With the drawdown of reservoir water level,the safety factor of anti-sliding stability of gravity dam will be increased gradually.

关 键 词：抗滑稳定 有限元法 塑性区 安全系数 

分 类 号：TV642.3[水利工程—水利水电工程]