极端环境下工程边坡运行稳定性模拟分析

Operational Stability Simulation Analysis of Engineering Slope under Extrme Environment

利用有限元软件ADINA对某水电站进口建筑物边坡在极端环境(降雨工况、地震工况、降雨地震组合工况)下进行了数值模拟,分析其变形和应力发展规律,并对边坡稳定性进行评价.得出如下结论:在降雨和降雨地震组合工况下,处于第一开挖平台处的岩体水平位移较大,处于第二开挖平台处的竖向位移较大,在该处易引起边坡失稳,但在地震工况下位移分布规律较好,故在开挖平台处需对边坡采取以排水为主的防范措施;在3种工况下边坡基本都处在受压状态下,受拉区域较小,但受拉最大值发生在同一位置,需对该位置进行重点监测;通过塑性区分布图的对比可发现地震是影响该边坡稳定的最关键因素,降雨地震组合工况为最不利于边坡稳定的工况.

The finite element software station inlet structure under extreme ADINA is adopted to simulate the engineering slope of a hydropower environment （rainfall condition, earthquake condition, rainfall comes with earthquake condition）. And then the development law of deformation and stress is analyzed. Some con- clusions are drawn as follows. Under rainfall and rainfall comes with earthquake condition, horizontal dis- placement of rock mass is larger in the first excavation platform and the larger vertical displacement appears in the second excavation platform; but the distribution law of displacements is better under earthquake condi- tion, so drainage preventive measures should be taken in the excavation platform as main method. Under three conditions, slope is almost in the state of compression; tensile area is little; but the maximum tension occurs in：the same position; we need to focus on monitoring this location. Through the comparison for distri- bution of plastic zone we find that earthquake is the most critial influencing factor on stability of the slope; rainfall comes with earthquake condition is the most disadvantage condition to slope stability.