根据青天河浆砌石重力坝的工程地质条件, 选择溢流坝段建立了坝体和坝基的三维有限元模型, 采用三维有 限元法和振型分解反应谱法对坝体进行了地震响应分析和安全评价。考虑水工结构物受地震荷载作用的荷载组 合, 按受拉最不利组合原则组合静态响应和动态响应, 从而得到综合的静动力响应, 并在此基础上对大坝进行强度 和抗滑稳定性分析和评价。结果表明: 在地震基本烈度为×度时, 在静动荷载共同作用下, 坝体强度满足规范要求; 坝基面抗滑稳定安全系数 3 1 47, 大于规范允许最小安全系数, 抗滑稳定性满足规范要求, 但是坝基承载能力不足, 需进行相应的加固处理。

According to the engineering geological conditions of Qingtianhe masonry gravity dam, a three 2dimensional finite ele 2 ment model of the overflow dam section was built using the three 2dimensional finite element method. The response spectrum method was used to conduct the seismic response and safety evaluation of the dam. In consideration of the load combinations caused by the seismic loading, the most disadvantaged tensile stress superposition principle was adopted to linearly superpose the static and dynamic calculation results, and the comprehensive static dynamic response was obtained. On the basis, the strength and stability against sliding of the dam were analyzed and evaluated. T he results showed that the strength of the dam meets the standard requirement under the static and dynamic loadings with seismic intensity of level VII; the safety coefficient of stability against sliding of the dam foundation is 3. 47, which is greater than the minimum safety coefficient allowed by the standard; and however, the carrying capacity of dam foundation is insufficient and needs to be reinforced.

江苏省普通高校研究生科研创新计划项目( CXZZ13_0253)