强降雨条件下具有张裂缝边坡临界滑动场

发布时间：2018-04-11 05:07

本文选题：边坡临界滑动场 + 边坡稳定性　；参考：《岩土力学》2016年S2期

【摘要】：降雨持时较长且雨强较大时,雨水的入渗不仅会增大孔隙水压力,且易使张裂缝充水形成静水压力,对边坡稳定不利。结合降雨条件下饱和-非饱和渗流分析,考虑降雨过程中的瞬态孔隙水压力场与瞬态强度场,并同时考虑张裂缝充水时的静水压力,对边坡临界滑动场法进行改进,提出降雨条件下具有张裂缝边坡临界滑动场数值模拟方法,且对其进行了验证。将该方法用于一个典型均质黏土边坡算例,结果表明,(1)文中方法可考虑张裂缝具体位置、深度及其充水状态下对边坡稳定性的影响,并能搜索出任意形状危险滑面,计算结果合理可靠;(2)降雨条件下张裂缝中静水压力对边坡稳定性及滑面形状有较大影响;(3)降雨条件下张裂缝位置对边坡稳定有较大影响,距坡肩越近,张裂缝对边坡稳定性影响越大;(4)张裂缝处在最不利位置且充水时存在一个最不利深度。
[Abstract]:When the rainfall duration is longer and the rainfall intensity is larger, the infiltration of Rain Water will not only increase the pore water pressure, but also make the tension fracture fill water to form hydrostatic pressure, which is unfavorable to the slope stability.Based on the analysis of saturated-unsaturated seepage flow under rainfall condition, the critical sliding field method of slope is improved by considering the transient pore water pressure field and transient strength field in the process of rainfall, and considering the hydrostatic pressure when the tension fracture is filled with water at the same time.A numerical simulation method for critical sliding field of slopes with tensile cracks under rainfall conditions is proposed and verified.The method is applied to a typical homogeneous clay slope. The results show that the method can take into account the influence of the concrete position of the tensile crack, the depth and the filling state on the slope stability, and can search the dangerous slip surface of any shape.The calculated results are reasonable and reliable. Under rainfall condition, hydrostatic pressure in tension crack has great influence on slope stability and slip surface shape. Under rainfall condition, the position of tension crack has great influence on slope stability, and the closer it is to the slope shoulder, the more close it is to slope stability.The greater the influence of tension fracture on slope stability, the greater the influence of tension fracture on slope stability. (4) the tension crack is in the most unfavorable position and there exists a most disadvantageous depth when filling water.
【作者单位】：合肥工业大学土木与水利工程学院;合肥工业大学安徽省土木工程与材料省级重点实验室;
【基金】：教育部优先发展课题(No.2013JYYF0661) 水利部公益项目(No.201401063) 国家自然科学基金(No.51179043)~~
【分类号】：TU43

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