抗滑桩施工中边坡稳定系数分析

The Effect of Excavation on the Safety Factor of Slope in Slide-resistant Piles Construction

采用连续介质快速拉格朗日差分分析方法,结合强度折减技术,设定解不收敛的破坏标准,来探讨抗滑桩施工过程中桩孔开挖对边坡安全系数的影响这一三维问题。结合工程实例,模拟几种开挖顺序,结果表明,合理的施工方案对边坡扰动甚微;而随意开挖桩孔可能使边坡失稳,且失稳时的位移不大,破坏征兆不明显,破坏更加突然,应特别注意。分析施工等因素对边坡稳定系数的影响,特别是处在极限状态下的边坡,十分必要。

The fast Lagrangian difference method of continua is used to analyze the effect of excavation on the safety factor of slope in slide-resistant piles construction. Strength reduction technic by setting a failure criterion the divergence of maximum unbalance force is also employed to study such a three dimensions problem. The authors compare the obtained safety factors of different construction process and come up with rational construction project, draw several conclusions which is of some reference value for similar engineering. The rational construction project can not only make the whole process under a higher safety factor,but also capture a more obvious displacement symptom before the collapse. It is necessary to analyze the safety factor decrease caused by construction especially for slope in critical state.