高重力坝岸坡坝段侧向稳定分析研究

Analysis of Lateral Stability of Bank Monolith of High Gravity Dam

某水电站为一等大(1)型工程,其主体挡水建筑物高达203m,是目前国内在建最高的碾压混凝土重力坝。在施工期,为了满足施工进度安排的要求,需要分析研究左岸岸坡进水口坝段的侧向稳定性。为此,分别采用刚体极限平衡法和有限元法,按分项系数法的原理进行计算分析,得到了以抗力与效应比值表征的点安全度和面安全度,以及最大稳定高度等成果。坝段的侧向抗滑稳定分析所得比值大于1,抗滑稳定性能够能够满足规范要求,但为了稳妥起见,施工时应控制最高浇筑高程。

The HD hydropower station is a large project of grade （ 1 ） with the highest rank. Its main water retai- ning structure is a RCC gravity dam with the height of 203m, which is the highest RCC dam Constructed in China. During the construction period, the lateral stability of those bank monoliths where the water intake is located, need to be analyzed to meet the need of construction schedule. So, both the limit equilibrium method and the finite ele- ment method are used in the study of the lateral stability. According to the principle of the partial coefficient method stipulated in the design specification for concrete gravity dams, both the safeties on the point and the slide facet, which are represented by the ratio of resistance to load, and some other results such as the limit retainable height, are obtained. Meanwhile, the regularities of the lateral stability of the bank monoliths are also revealed. These re- suits can provide robust sut）oort for the decision in the project construction.