选取三峡库区典型库岸的砂岩进行“浸泡-风干”循环试验,模拟库水升降条件对库区水位变幅区岩石强度的影响。根据岩石试验结果和岩体RMR法推算出经历不同水位条件下岩体参数劣化规律,并通过数值模拟研究变幅区砂岩的劣化对库岸典型滑坡区库岸稳定性的影响,分析库岸边坡在库水长期作用下演化规律。研究表明水位升降过程对变幅区岩体质量的劣化作用较为明显,会导致库岸边坡破坏的时间大为缩短;库岸坍塌破坏过程与此类滑坡稳定性有直接的联系,可能最终会导致此类滑坡复活。研究成果可为库区内此类滑坡长期稳定性分析提供参考。
Abstract
The influence of reservoir water level on rock strength in the water level variation zone was researched through immerse-dry test on sandstone collected from typical bank slope in Three Gorges Reservoir area. The degradation of rock mass parameters in the presence of different water levels was deduced by using the test results and RMR method. Furthermore, the impact of rock degradation in the variation zone on the stability of a typical landslide in the Three Gorges Reservoir Area was analyzed through numerical simulation. Results reveal that the increase and drawdown of water level has obvious deterioration effect on rock mass, and shortens the time of bank slope failure. The reservoir bank collapse is directly related with the landslide stability and may cause the reliving of landslide. This research is a reference for analyzing the long-term stability of landslide in the reservoir area.
关键词
库岸边坡 /
浸泡-风干试验 /
库水位变幅区 /
滑坡复活 /
岩体RMR法
Key words
bank slope of reservoir /
immerse-dry test /
variation zone of reservoir water level /
landslide relive /
RMR method
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