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首页> 外文期刊>Canadian Geotechnical Journal >Stability and failure mass of unsaturated heterogeneous slopes
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Stability and failure mass of unsaturated heterogeneous slopes

机译：非饱和非均质边坡的稳定性和破坏质量

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摘要

Rainfall infiltration in an unsaturated soil slope induces loss of suction (and even positive pore-water pressures), which can eventually lead to failure. This paper investigates the probability and the size of failure of an unsaturated slope with spatially variable void ratio, subjected to a constant intensity rainfall. The random finite element method is employed in conjunction with a Monte Carlo simulation to stochastically evaluate the factor of safety and the size of the sliding mass. The results indicate that the mean value and the variability of these two quantities depend on both correlation length and coefficient of variation of the void ratio field. This dependency is more prominent during the transient regime than at steady states. Notably, the factor of safety in some cases can be low but the corresponding sliding mass is relatively small, while in other instances, the factor of safety might remain large though the associated sliding mass is very sizeable. The correlation between the factor of safety and the size of the sliding mass shifts from positive to negative as the rainfall progresses. A simple quadrant plot is suggested to assess the risk associated with slope failure, taking into account both the factor of safety and the size of failure, rather than the factor of safety alone as it is usually the case. The study also demonstrates an application of a numerical approach to assess stability of geostructures composed of complex multiphase materials such as unsaturated soils or frozen soils.
机译：在非饱和土壤斜坡中的降雨入渗会导致吸力损失（甚至是正的孔隙水压力），最终可能导致破坏。本文研究了在恒定强度降雨条件下具有空间可变孔隙比的非饱和斜坡的概率和破坏规模。随机有限元方法与蒙特卡洛模拟结合使用，以随机评估安全系数和滑动质量的大小。结果表明，这两个量的平均值和变异性取决于空隙长度场的相关长度和变异系数。在过渡状态下，这种依赖性比在稳态下更为突出。值得注意的是，在某些情况下安全系数可能较低，但相应的滑动质量相对较小，而在其他情况下，尽管相关的滑动质量非常大，安全系数仍可能保持较大。随着降雨的进行，安全系数与滑动块大小之间的相关性从正变负。建议使用简单的象限图来评估与边坡破坏相关的风险，同时考虑安全因素和破坏的规模，而不是通常情况下的仅考虑安全因素。该研究还证明了数值方法在评估由复杂多相材料（例如不饱和土壤或冻土）组成的地质结构的稳定性中的应用。

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