摘要
基于极限分析运动学定理与拟静力法,建立了二级边坡抗震稳定性分析模型。根据边坡不同的外形拓展出了两种坡面破坏形式。在此基础上,分析了边坡外形、上级边坡深度系数以及水平向地震力等因素对边坡稳定性的影响。对于不满足设计要求的二级边坡,考虑采用抗滑桩加固的方式,建立了单排抗滑桩加固边坡的功率方程,将桩身有效抗力作为目标函数进行优化,分析了抗滑桩最优桩位问题。研究结果表明,边坡外形与深度系数等因素对边坡稳定性及破坏模式均有较大影响。根据抗滑桩提供抗力最小的原则,二级边坡的最优布桩位置应靠近坡趾。对于二级边坡设计及施工具有一定的指导价值。
The seismic stability of a two-stage slope is studied based on the kinematic theorem of limit analysis and the pseudo-static method.Two kinds of face-failure mechanism are introduced according to the shape of the slope.On this basis,the effects of slope shape,depth coefficient and horizontal seismic coefficient on the slope stability are investigated.For a specific two-stage slope that does not meet the design requirements,stabilizing piles are placed to increase the slope stability.Then the power equation of the slope reinforced with one row of piles is established.The effective resistance of pile body is optimized as the objective function.Finally,the optimal pile location is discussed.The results show that the slope shape and the depth coefficient have great influence on the stability and the failure mode of the two-stage slope.The optimal location for placing piles should be close to the slope toe.The solution obtained may provide practical guidance for the design and construction of the two-stage slope.
作者
蒋赣猷
JIANG Ganyou(Guangxi Luqiao Engineering Group Co.,Ltd., Nanning 530011, China)
出处
《结构工程师》
北大核心
2019年第4期190-197,共8页
Structural Engineers
关键词
二级边坡
极限分析
抗滑桩
抗震稳定性
two-stage slope
limit analysis
stabilizing pile
seismic stability
