运用非饱和土渗流理论和抗剪强度理论,以付家坪子高陡滑坡为例,采用极限平衡法,分析了库水位不同升速和降速、降雨不同强度以及库水位变化与降雨联合作用工况下滑坡的稳定性。计算结果表明库水位上升越快,滑坡安全系数的增长速率越大;降速对滑坡稳定性的影响基本上呈抛物线变化,即安全系数先减小,后增加,每个降速下均存在一个临界水位;降雨强度越大,滑坡的稳定性就越差,随着库水位的升高,降雨对安全系数的降低幅度有所减小;在研究库水位下降与降雨在时间上的最不利组合方式时,发现降雨作用在最末对滑坡稳定性的影响比作用在最初要有利;该高陡滑坡在库水位变化、降雨以及库水位变化和降雨联合作用下,安全系数的变化幅度均很小。
Abstract
In accordance with theories of unsaturated flow and shear strength, limit equilibrium method was employed to analyze the stability of landslide in different conditions different raising and falling rates of water level, different rainfall intensities, and combined action of water level fluctuation and rainfall infiltration. Fujiapingzi landslide on the Jinsha river was taken as an example. The calculation results show that when the water level raises faster, the growth rate of landslide’s safety factor increases; the effect of water level drawdown velocity is generally parabolic, which means that the safety factor reduces firstly and then increases. There is a critical water level at each drawdown velocity. When rainfall intensity increases, the stability of landslide worsens. With the raise of water level, the effect of rainfall on safety factor decreases. By analyzing the most unfavorable combination of reservoir water lever drawdown and rainfall infiltration in terms of time, we found that the rainfall acting in the last period is more beneficial than that acting in the initial period. The variation of safety factor of this high and steep landslide is small in all the above conditions.
关键词
高陡滑坡 /
库水位变化 /
降雨 /
滑坡稳定性
Key words
high and steep landslide /
reservoir water level fluctuation /
rainfall /
landslide stability
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基金
国家自然科学基金项目集成项目(91215301);中国科学院知识创新工程重要方向项目(Y028021C01);中国科学院院地合作项目(ZNWH-2011-011)
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