A limit equilibrium stability analysis of slopes with stabilizing piles
A limit equilibrium stability analysis of slopes with stabilizing piles
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DOI：
10.1061/40512(289)25
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发表时间：
2000-07
期刊：
影响因子：
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通讯作者：
T. Yamagami;Jingcai Jiang;K. Ueno
中科院分区：
文献类型：
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作者：
T. Yamagami;Jingcai Jiang;K. Ueno
本文提出了一种带有排桩的边坡设计方法，以增强边坡稳定性或防止边坡破坏。该方法的基本思想是允许在桩排的上坡和下坡土体中假设两个不同的滑移面。与针对给定滑移面计算安全系数的传统极限平衡程序相反，在本方法中，基于给定滑移面来估计作用在稳定桩上的力，该给定滑移面的安全系数被规定以确保边坡稳定性。通过分别假设上部土体和下部土体中的滑动面，可以根据现有的极限平衡方法和规定的安全系数值来计算作用在桩上的力。采用Bishop法，通过反复试验程序找出桩最危险的情况以及对应的桩排上、下两个临界滑移面。可以理解的是，如果稳定桩在最危险的情况下仍然完好，那么边坡至少具有规定的（目标）安全系数。在所提出的方法中，我们清楚地区分了连续桩所能承受的力，即被动桩的水平承载力，和目标安全系数下连续桩应承受的力。后者不超过前者的考虑使得稳定桩的设计更加合理。一些例子的结果说明了该方法的有效性。
This paper presents a design method for slopes with a row of piles to enhance slope stability or to prevent slope failure. The basic idea of the method is to allow that two different slip surfaces can be assumed in upslope and downslope earth masses of the row of piles. Contrary to the conventional limit equilibrium procedure where a factor of safety is calculated for a given slip surface, in the present method forces acting on the stabilizing piles are estimated based on a given slip surface whose factor of safety is prescribed to ensure the slope stability. By assuming a slip surface in upper and lower earth masses respectively, the forces acting on the piles can be calculated from an existing limit equilibrium method with a prescribed value of the factor of safety. The Bishop method is employed, and a repeated trial procedure is used to find the most dangerous situation for the piles and the corresponding two critical slip surfaces in the upside and downside of the pile row. It may be understood that if the stabilizing piles are still sound under the most dangerous situation, then the slope will have, at least, the prescribed (target) factor of safety. In the proposed method, we clearly distinguish between forces which piles in a row can bear, i.e. the horizontal bearing capacity as passive piles, and forces which piles in a row should bear under the target factor of safety. The consideration in which the latter does not exceed the former makes possible a more rational design for stabilizing piles. The results of some examples illustrate the effectiveness of the proposed method.