基坑临时加深双层围护结构破坏研究*
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（1辽宁工程技术大学建筑工程学院，阜新 123000； 2沈阳建都工程建设监理公司，沈阳112700）[摘 要] 基坑需要临时加深时，在原围护结构内侧再增设一道围护结构已成为确保开挖安全的重要措施。内侧围护结构的位置以及尺寸的选择对整个基坑的变形及稳定性有重要影响。通过有限元法研究了不同内侧围护结构参数选择对基坑破坏形态的影响，其中包括内外墙重叠深度、内墙嵌入比、内外墙距离等。分析结果表明，该双层围护结构的破坏形态可能有外墙的踢脚破坏，强度破坏，内墙的踢脚、倾覆破坏，整体失稳等，不同的内墙设计可能导致不同的潜在破坏形态，在分析的基础上，提出了防止不同围护结构破坏形态的设计注意事项，为类似的基坑工程设计提供了依据。[关键词] 破坏形态; 基坑; 双层围护结构; 有限元法中图分类号：TU471.99 文献标识码：A 文章编号：1002-848X(2013)S2-0605-04Study on failure mode of double-row support structure for deepened braced excavationLiu Wu 1 , Liu Shubo2(1 College of Civil Engineering and Architecture, Liao Ning Technical University, Fuxin 123000，China; 2 Shenyang Jiandu Supervision Company of Construction Engineering , Shenyang 110181, China)Abstract: Adding another supporting wall inside the original support wall is an important measure to ensure the safety of the excavation when the excavation depth increases temporarily. The location and dimension of the inner wall has a significant influence on the deformation and stability of the excavation. Parametric studies were carried out to investigate the influence factors on the failure model of the support structures with finite element analysis. The parameters include overlapping length of the two support walls, embedment ratio of the inner wall and distance between the two support walls. The results show that the potential failure mode including ‘kick foot’ failure and strength failure of the outer wall, ‘kick foot’ failure and overturn failure of the inner wall, integral instability and so on. Suggestions preventing failure were presented and provide a basis for the design of similar foundation pits.Keywords: failure mode; foundation pit; double-row support structure; finite element method作者简介：刘婺，学士，Email：lntuliushuxian@163.com。
