考虑尺寸效应的狭窄型基坑稳定性分析

按传统基坑理论设计的狭窄基坑偏保守,造成较大的工程浪费.从基坑的尺寸效应入手,借助ABAQUS有限元软件,建立半无限空间弹性体和无限空间弹性体的支护结构模型,模拟桩撑围护结构在不同基坑开挖深度H、支护桩嵌入深度D、基坑宽度B组合情况下的力学特性;根据抗倾覆稳定理论和圆弧滑移理论,深入分析了H、D及B与基坑稳定性的内在关...

Stability analysis of narrow excavation considering size effect

Engineering practice and studies show that the narrow excavation designed according to the traditional foundation pit theory is conservative and causes a large engineering waste. Based on size effect of excavation, with the help of finite element software ABAQUS, the retaining structure model of semi-infinite space elastomer and infinite space elastomer was established to simulate the mechanical properties of pile support envelope under different combinations of the excavation depth H, the embedded depth of retaining pile D and excavation width B. Based on the anti-overturning stability theory and the circular slip theory, the inner relationship between H, D and B as well as the stability of excavation is deeply analyzed. In the actual working conditions, the critical width of excavation is determined based on the restraint effect of retaining structures on the soil at the bottom of the pit, and excavation is classified accordingly, applicability of the existing codes in the design is defined. The research results can guide the design and construction of narrow excavation, which will bring better engineering benefits and social benefits.