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坡体地下水水位变化引起坡内水力梯度的变化是导致边坡失稳的重要因素。通过将强度折减技术与极限上限定理结合,利用安全系数指标对地下水位变化影响下的均质边坡进行了稳定性分析,并进行了对比计算和参数分析。分析中将孔隙水压力当作外力,水位变化对边坡的影响作用通过虚功方程表现出来。对比计算表明:与已有结果的对比可以证明表明本文方法的正确性,且本文是较同类方法略好的上限解答;参数分析表明:坡内地下水位升降对边坡稳定性和潜在破坏面影响较大,地下水位上升引起孔隙水压力增大是坡体发生失稳的重要原因。
The change of hydraulic gradient caused by the change of groundwater level in slope body is the important factor leading to the instability of slope. By combining the strength reduction technique with the limit upper bound theorem, the stability analysis of the homogeneous slope under the influence of groundwater level changes is carried out by using the safety factor index, and the comparative calculation and parameter analysis are carried out. Analysis of pore water pressure as an external force, the water level changes on the impact of the slope through the virtual work function shown. The comparison shows that compared with the existing results, this method can be proved to be correct, and this paper is a slightly better upper bound solution than other similar methods. Parametric analysis shows that the influence of the rise and fall of groundwater table on the slope stability and potential failure surface Larger, the increase of pore water pressure caused by the rise of groundwater level is an important reason for slope instability.