针对加固城市渣土堆填边坡的抗滑桩桩位优化问题,基于强度折减技术和极限分析上限法,采用遗传算法结合非线性规划SQP算法,提出了渣土边坡抗滑桩桩位优化方法。深圳市某渣土堆填边坡抗滑桩桩位优化分析结果表明:给定安全系数下,抗滑桩桩位对抗滑桩需提供的抗滑力、滑裂面以上桩长和最可能滑裂面都有显著影响;暴雨工况下的抗滑力、滑裂面以上桩长和最可能滑裂面范围均大于自然工况下的。考虑局部失稳问题,综合确定天然工况和暴雨工况下加固案例边坡抗滑桩最优桩位分别位于为桩位系数ε=0.3和ε=0.6附近。研究结果可为渣土边坡抗滑桩桩位优化设计提供技术指导和理论支撑。
Abstract
In line with the upper-bound limit analysis method and strength reduction technic, a method of optimizing the position of stabilizing piles in reinforcing construction solid waste (CSW) landfill slopes is proposed through genetic algorithm combined with nonlinear programming SQP (Sequence Quadratic Program) to determine the optimal position of stabilizing piles. A CSW landfill slope in Shenzhen is taken as the case slope. Research results evince that at a given required safety factor, the location of stabilizing piles have remarkable impact on the anti-sliding force, the pile length above slip surface and the critical slip surface. In addition, the anti-sliding force, the pile length above slip surface and the range of critical slip surface under heavy rain condition are greater than those under natural condition. Moreover, the local stability of the case slope is discussed. The optimal locations of stabilizing piles for the case slope under natural and heavy rain conditions are around the position where ε=0.3 and 0.6, respectively. The results offer technical guidance and theoretical support for the optimal design of the position of stabilizing piles in CSW landfill slopes.
关键词
渣土边坡 /
抗滑桩桩位优化 /
极限分析上限法 /
强度折减技术 /
遗传算法
Key words
construction solid waste landfill slope /
optimal pile position /
upper-bound limit analysis method /
strength reduction method /
genetic algorithm
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基金
深圳市科技创新委员会深圳市科技计划技术攻关项目(JSGG20160331154546471);中国地质大学(武汉)中央高校基本科研业务费专项资金资助项目(1810491A23)
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