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首页> 外文期刊>Indian Geotechnical Journal >Effect of Spatial Variability of Soil Properties on Slope Reliability Using Random Finite Element and First Order Second Moment Methods
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Effect of Spatial Variability of Soil Properties on Slope Reliability Using Random Finite Element and First Order Second Moment Methods

机译：随机有限元和一阶二阶矩法研究土壤性质的空间变异性对边坡可靠度的影响

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摘要

Spatial variability of soil properties is an important factor that affects the probability of slope failure. Random finite element method (RFEM) is the most effective method to evaluate the probability of failure of slopes. In this study, the probability of slope failure is calculated using Monte Carlo simulation based on displacement based criteria. The probability of failure of an undrained cohesive slope is studied using RFEM, first order second moment (FOSM) method and FOSM combined with variance reduction theory, called modified FOSM (MFOSM). A comparison among FOSM, MFOSM and RFEM is shown for different values of undrained shear strength and scales of fluctuation. As FOSM does not consider the spatially varying nature of soil properties, it gives a constant probability of failure for varying scales of fluctuation, a parameter that represents the spatial variability of soil properties. In general, MFOSM has similar trend with RFEM, however, MFOSM cannot demonstrate the failure mechanism for spatially varying soils. The use of RFEM and determination of realistic scales of fluctuation, coefficient of variation of soil properties is recommended for slope reliability analysis.
机译：土壤特性的空间变异性是影响边坡破坏概率的重要因素。随机有限元法（RFEM）是评估边坡破坏概率的最有效方法。在这项研究中，基于基于位移的标准，使用蒙特卡洛模拟计算了边坡破坏的可能性。利用RFEM，一阶二阶矩（FOSM）方法和FOSM结合方差减少理论（称为修正FOSM（MFOSM））研究了不排水内聚坡的破坏概率。 FOSM，MFOSM和RFEM之间的比较显示了不排水剪切强度和波动范围的不同值。由于FOSM没有考虑土壤特性的空间变化性质，因此它给出了变化的尺度波动的恒定失效概率，该参数代表土壤特性的空间变异性。通常，MFOSM与RFEM具有相似的趋势，但是，MFOSM无法证明空间变化土壤的破坏机理。建议使用RFEM并确定实际的波动范围，土壤特性的变化系数来进行边坡可靠度分析。

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