摘要
探讨计算复合土钉支护边坡稳定性安全系数的一种方法,为设计提供较为科学合理的分析手段。基于土坡稳定性分析的Bishop法,建立了稳定性安全系数的计算公式。采用几何控制参数法对最危险滑移面进行搜索。通过分别移动基底、地表水平面和位于基坑高度一半处的水平面上的三个几何控制点,寻找到边坡最危险滑移面并计算出对应的稳定性安全系数。计算表明:(1)用几何控制参数法搜索的最危险滑移面有且仅有一个;(2)改进后的搜索方法趋于完善、合理和准确;(3)对于软弱土层,当边坡侧壁垂直时,滑移面通过坡趾的假设不合理;(4)用该方法计算的工程实例安全系数与实际情况吻合较好,具有较高的工程应用价值。
A method for calculating the stability safety factor of slope supported by composite soil nailing is proposed. A formula of stability safety factor is established using the Bishop method. The critical slip surface and its safety factor are found by expressing the position of trial slip surface in terms of a few properly chosen geometric parameters. The slip surface is searched through moving the three geometric control points on the ground surface, the bottom of excavation and the surface at half of the height of the excavation, respectively. Several engineering projects are analyzed using the proposed method. Results show that (a) the critical slip is obtainable and unique; (b) the improved method is more reasonable than previous methods; (c) the hypothesis that the slip surfaces through the foot of slope is unreasonable for vertical slopes in soft ground; and (d) the agreement with the factual results indicate that the present method is of practical value.
出处
《工程力学》
EI
CSCD
北大核心
2005年第3期126-133,共8页
Engineering Mechanics
基金
河北省普通高等学校博士科研资助基金项目(B2002114)
关键词
土力学
边坡稳定
复合土钉支护
安全系数
最危险滑移面
soil mechanics
slope stability
composite soil nailing
safety factor
critical surface
