为了在初期勘察阶段少量室内和现场试验基础上准确快速地对开挖边坡进行稳定性评价,提出了一种新的边坡稳定性评价方法。基于极限分析上限定理,推导不排水条件下开挖边坡二维稳定性极限分析理论,根据理论公式编程计算,得到不排水条件下开挖边坡稳定系数图表及滑动面变化规律,从而建立不排水条件下开挖边坡稳定性评价方法。结果表明,以极限分析上限定理为依据确定边坡稳定系数和不排水抗剪强度比值的关系、滑动面与限制深度的关系来评价边坡稳定性,其物理意义明确,计算结果客观,相比于极限平衡法和数值分析法,极限分析法更适合于开挖边坡的稳定性评价。
Abstract
A new slope stability evaluation method is proposed to evaluate the stability of excavation slope accurately and rapidly based on a small amount of indoor and field tests during initial survey. On the basis of the upper bound theorem of limit analysis, a two-dimensional limit analysis expression for the stability of excavation slope under undrained condition is derived. Tables and diagrams of stability coefficient and the variation of sliding surface under undrained condition are obtained and analyzed according to the calculation result. Finally a method of evaluating the stability of excavation slope under undrained condition is established. Results indicate that the relations between stability coefficient and undrained strength ratio, sliding surface and controlling depth can be quantified by upper bound theorem of limit analysis, which is of definite physical meaning and high calculation precision. Compared with limit equilibrium method and numerical analysis method, limit analysis method is more suitable for the evaluation of excavation slope’s stability.
关键词
开挖边坡 /
极限分析法 /
边坡稳定系数 /
不排水抗剪强度 /
滑动面 /
限制深度
Key words
excavation slope /
limit analysis /
stability coefficient of slope /
undrained shear strength /
sliding surface /
limit depth
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参考文献
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基金
国家重点实验室开放基金项目(YK913004); 国家重点基础研究发展计划项目(2015CB057901); 水利部公益性行业科研专项项目(201501035-03)
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