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基于可靠性的复合土钉支护基坑稳定性分析

DOI: doi:10.3969/j.issn.1006-7043.2011.10.007

Keywords: 预应力锚杆, 复合土钉, 基坑, 内部整体稳定, 可靠性??

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Abstract:

针对预应力锚杆复合土钉支护基坑内部整体稳定的可靠性计算问题,以边坡极限平衡理论与圆弧滑动面法为基础,应用扰动力法建立了基坑内部整体稳定性分析的功能函数与最危险滑动面的计算模型.通过SLP优化法与单形调优法实现了最危险滑动面的优化搜索.以土体的抗剪强度指标作为随机变量,应用AFOSM(2)法计算了基坑内部整体稳定可靠性指标,并结合工程实例进行了分析.分析表明:基坑内部整体稳定的可靠性指标??β受土体粘聚力、内摩擦角与摩阻力变异系数的影响较大,且随变异系数的增大而减小;其中,内摩擦角的变异系数对β的影响最大,摩阻力的变异系数对β的影响最小;并且在基坑开挖深度范围内,中下部土层对β的影响较大,上部土层对β的影响较小.??

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