基于土拱效应抗滑桩桩间距计算及土拱可靠度分析

Calculation of anti-slide piles spacing based on soil arching effect and reliability analysis of soil arch

根据土拱效应产生条件及抗滑桩桩间土拱形成过程,分析了抗滑桩桩间土拱的结构形式和合理拱轴线。建立土拱受力分析模型,提出以拱脚强度、拱顶强度、静力平衡和桩间绕流为控制条件,计算考虑土拱效应的抗滑桩间距。此外,为衡量抗滑桩桩间土拱效应的可靠性,采用Rosenblueth法对桩间土拱的可靠度进行计算,并建议在设计施工中采取有效措施,提高土拱的可靠度。

According to the production conditions of arching effect and tormatlon process ot me arch oetween anti-slide piles, the structure form and the reasonable arch axis of soil arch were analyzed. Based on the mechanical analysis model of the soil arch, it put forward that arch foot strength, vault strength, static equilibrium and flow between piles should be the control conditions in calculation of anti-slide piles spacing when considering the soil arching effect. Besides, in order to ensure reliably of the soil arching effect, the reliability could be calculated by Rosenblueth. And during design and construction, some effective measures should be taken to improve the reliability of the soil arching.