渐近搜索算法在软土基坑基底抗隆起上限分析中的应用
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TU 432

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重庆市建设科技计划(2019-0045);重庆市教委科学技术研究项目(KJZD-K201900102)


Application of progressive search algorithm in upper bound analysis of basal stability for braced excavations in soft clay
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    摘要:

    潜在破坏面的确定是软土基坑基底抗隆起上限分析的难点与重点。在传统的上限分析法中,破坏面仅假设与基坑开挖宽度有关。而采用渐进搜索算法确定破坏面,无需假设破坏面具体形状,通过多次迭代计算即可确定临界破坏面,且该算法已在边坡稳定与可靠度分析中成功应用。介绍了应用多块体上限法分析基坑抗隆起稳定性的基本步骤,并详细介绍了渐进搜索算法的流程,针对基坑抗隆起分析问题的特点,对渐进搜索算法中的初始破坏面生成、搜索边界、收敛准则等重新进行了设置;针对搜索过程中遇到的问题,给出了解决方法。通过实例分析检验渐近搜索算法的实际应用效果,并围绕算法中的初始搜索步长、破坏面结点个数、搜索次数等关键参数进行讨论,给出建议取值。案例分析表明,渐近搜索算法在软土基坑基底抗隆起上限分析中应用效果很好,且相比于其他的上限分析方法,渐近搜索算法计算简单,无需假设破坏面形状参数。

    Abstract:

    Determining the potential failure surface plays an important role in basal stability analysis of braced excavations in soft clay by upper bound method. For traditional upper bound method, it is assumed that failure surfaces are only related with excavation width. However, for progressive search method, the critical failure surfaces can be evaluated by multi-iterations without assuming detailed shape of failure surfaces. And this method was successfully applied to slope stability analysis. Firstly, this paper introduced the step of basal stability analysis of excavation via multi-block upper bound method. Secondly, this paper illustrated the framework of progressive search method. Considering the characteristic of basal stability analysis of excavation, the generation of initial failure surfaces, the search boundary and the convergence criteria are reset. And some solutions are proposed to deal with the problems during search process. Moreover, this paper verifies the performance of progressive search method by case studies, and proposes conclusions about search length, number of pointsat the failure surface and number of searches. At last, this paper concludes that progressive search method is applied in basal stability analysis successfully. And compared to other upper bound method, progressive search method without assuming detailed shape of surfaces is easier to calculate.

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洪利,仉文岗.渐近搜索算法在软土基坑基底抗隆起上限分析中的应用[J].土木与环境工程学报(中英文),2020,42(6):46-53.

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  • 收稿日期:2020-04-23
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  • 在线发布日期: 2020-11-26
  • 出版日期: 2020-12-31