抗滑桩加固非均质边坡稳定性上限分析OA北大核心CSTPCD
Upper bound analysis of heterogeneous slopes reinforced by anti-slide piles
针对非均质边坡的稳定性分析,基于极限分析上限法构建边坡离散运动学破坏机构以考虑土体内摩擦角非均质性的影响,结合强度折减法推导出了孔隙水压力作用下抗滑桩加固边坡安全系数的表达式.采用序列二次规划优化算法结合二分法进行优化求解并与已有文献成果进行对比,验证了该方法的正确性,并将新方法应用于案例分析.结果表明:孔隙水压力的增加会导致内摩擦角非均质性对边坡稳定性的影响减小,同时使非均质边坡安全系数下降以及临界滑动面向坡内转移,边坡破坏模式由坡趾破坏转变为坡底破坏;内摩擦角非均质性与孔隙水压力对抗滑桩最优加固位置影响可忽略不计;边坡形状及土层分布情况对滑动面及抗滑桩最优加固位置影响较大,在实际工程中应给予重视.
Aiming at the stability analysis of heterogeneous slopes,a discrete kinematic failure mechanism of slopes was con-structed based on the upper limit analysis method to consider the influence of heterogeneity of soil internal friction angles.Com-bined with the strength reduction method,an expression of the safety factor of slopes reinforced by anti-slide piles subjected to pore water pressure was derived.Sequential quadratic programming optimization algorithm combined with dichotomy method was used to optimize the solution,and the correctness of the method was verified by comparing the results with the existing literature solutions,and a case study was carried out.The results show that the increase of pore water pressure will reduce the influence of heterogeneity of internal friction angles on slope stability,and also lead to the decrease of the safety factor of the heterogeneous slope and the critical sliding surface shifting inward the slope,which change slope failure mode from toe failure to base failure.The heterogeneity of internal friction angles and pore water pressure have little effect on the optimal position of anti-slide piles.The shape of slopes and soil layer distribution have great influence on the critical sliding surface and the optimal reinforcement position of anti-slide piles,which should be paid attention to in practical engineering.
颜平;颜丹
广西昇龙工程勘察设计检测有限公司,广西河池 547000
土木建筑
边坡稳定性极限分析孔隙水压力非均质性抗滑桩
slope stabilitylimit analysispore water pressureheterogeneityanti-slide pile
《人民长江》 2024 (008)
202-209 / 8
上海市"科技创新行动计划"软科学研究领域青年项目(22692193700)
评论