边坡下滑推力计算的有限元法

发布时间：2018-05-06 16:22

本文选题：边坡工程 + 下滑推力　；参考：《岩石力学与工程学报》2017年S2期

【摘要】：滑坡推力计算一直是边坡防治核心问题。针对我国规范中传递系数法只适用于二维问题且滑移面形状只能为圆弧形或坡度不大的折线形问题,基于边坡体当前有限元应力状态,参考传递系数法的力学模型,推导加载型及强度储备型下滑推力计算公式,提出一种计算滑坡剩余下滑推力的有限元法。该方法考虑坡体下滑力的矢量特征,以局部潜在滑体为研究对象,通过应力矢量积分不仅能给出设计安全系数下坡体沿滑移面的下滑推力曲线和对应的下滑方向曲线,而且根据坡脚处下滑推力的迭代计算可得到坡体当前的稳定安全系数。典型算例计算结果表明:该方法与传递系数法得到的剩余下滑推力曲线规律一致,且通过下滑推力迭代得到的坡体安全系数与严格极限平衡法相比,精度均较高,计算误差在工程上完全可以接受。最后将该方法应用到西藏樟木典型折线形边坡体,两种方法得到的剩余下滑推力基本一致,验证了该方法计算下滑推力的合理性及工程应用可行性。
[Abstract]:Landslide thrust calculation is always the core problem of slope prevention and control. According to the fact that the transfer coefficient method is only suitable for two-dimensional problems and the slip plane shape is only circular arc or the slope is not large in the code of our country, based on the current finite element stress state of the slope body, the mechanical model of the transfer coefficient method is referred to. The formulas for calculating sliding thrust of loading type and strength reserve type are derived, and a finite element method for calculating the residual sliding thrust of landslide is presented. This method takes into account the vector characteristics of sliding force of slope body and takes the local potential sliding body as the research object. By means of stress vector integration, not only the sliding thrust curve along the slip plane and the corresponding gliding direction curve of the slope body under the design safety factor can be obtained by means of the stress vector integral. According to the iterative calculation of the sliding thrust at the foot of the slope, the current stability factor of the slope can be obtained. The calculation results of typical examples show that the method is consistent with the law of residual sliding thrust curve obtained by transfer coefficient method, and the slope body safety factor obtained by iteration of sliding thrust is more accurate than that of strict limit equilibrium method. The calculation error is completely acceptable in engineering. Finally, the method is applied to the typical zigzag slope of Zhangmu, Tibet. The residual sliding thrust obtained by the two methods is basically the same, which verifies the rationality of the calculation of the sliding thrust and the feasibility of engineering application.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;中国科学院大学;
【基金】：国家自然科学基金面上项目(51674239,51379204)~~
【分类号】：TU43

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