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为了研究山区水库边坡的稳定性,以拟建红河特大桥的岸坡为例,采用不同理论计算方法分析了岸坡在自然、暴雨、水库水位变化、地震等不同工况下的边坡稳定性。计算结果表明,自然状态下以及库区排水过程,陡坡的安全系数均大于1,正常情况不出现滑动,处于欠稳定状态。但是地震、暴雨、以及地震和暴雨耦合工况均出现安全系数小于1。而且,暴雨工况比小震工况影响更显著,水位下降也会显著降低边坡安全性。正常工况下边坡潜在滑动体主要出现在边坡中部的上覆土区域,而在小震以上级别地震时边坡潜在滑动体范围扩散显著,甚至延伸到坡底范围。由于拟建桥梁位于边坡中部附近,建议对中部区域上覆土进行挖除或者进行加固,此外建议库区水不宜快速排泄,同时加强对坡体长期稳定性监测,保障桥墩稳定性。
In order to study the stability of mountainous reservoir slope, taking the bank slope of Honghe Super Major Bridge as an example, the slope stability under different conditions such as natural, heavy rain, reservoir water level changes and earthquakes is analyzed by different theoretical calculation methods Sex. The calculation results show that the safety factor of steep slopes is greater than 1 in the natural condition and drainage in the reservoir area, and does not slip under normal conditions and is in an unstable state. However, there is a safety factor of less than 1 for earthquakes, heavy rains, and seismic and storm coupling conditions. Moreover, heavy rainfall conditions have more significant effects than small earthquakes. Decreasing water levels can also significantly reduce slope safety. Under normal conditions, the potential slides of the slope mainly appear in the overlying soil area in the middle part of the slope, while the scope of the potential sliding body in the slope spreads significantly even beyond the magnitude of small earthquakes, even extending to the slope bottom. Because the proposed bridge is located near the middle of the slope, it is suggested to excavate or reinforce the overlying soil in the middle area. In addition, it is suggested that the water in the reservoir area should not be expelled rapidly and the long-term stability monitoring of the slope should be strengthened to ensure the stability of the piers.