基于临界滑动场的深基坑稳定数值分析及应用  

Numerical analysis of deep foundation pit stability based on critical sliding field and application

作　　者：杨彬 朱大勇 YANG Bin;ZHU Dayong(Institute of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China;Ningbo Tech University,Ningbo 315100,China;Ningbo Research Institute,Zhejiang University,Ningbo 315100,China)

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009 [2]浙大宁波理工学院,浙江宁波315100 [3]浙江大学宁波研究院,浙江宁波315100

出　　处：《人民长江》2020年第7期193-199,共7页Yangtze River

基　　金：国家自然科学基金资助项目(51179043)。

摘　　要：支撑作用是深基坑整体抗滑稳定性分析中不可忽视的影响因素。在考虑基坑开挖深度变化、多层地基土和支护结构的条件下,进一步推广原有边坡临界滑动场理论,初步提出一种复杂土体结构基坑临界滑动场数值分析方法。以隧道基坑工程为背景,研究了基坑整体稳定性在挖深和支撑影响下的变化,并将验算结果与圆弧滑动条分法进行对比。结果表明:相比基坑规范假定的圆弧滑动面,提出的方法能搜索出更为合理的任意形状的临界滑面,且安全系数验算值可信度高;支撑是影响深大复杂基坑整体抗滑稳定的重要因素,验算时若不考虑支撑作用将会造成滑面位置的改变和安全系数结果的不合理。Supporting effect is a non-negligible influence in the analysis of the overall anti-sliding stability of deep foundation pits.By considering the depth change of foundation pit excavation,multi-layer foundation soil and supporting structure,the original theory of critical slip field of slope was further extended,and a numerical analysis method on foundation pit of complex soil structure by critical slip field was preliminarily proposed.Taking a foundation pit of a tunnel as the background,the variation of the overall stability of the foundation pit under the influence of depth and support was studied,and the calculation results were compared with the arc sliding strip method.The conclusions showed that compared with the arc sliding surface assumed by the foundation pit specification,the proposed method could search for a more reasonable critical sliding surface of arbitrary shape,and the reliability of the safety factor was high.The support is an important factor affecting the overall anti-sliding stability of deep and complex foundation pits,if the support is not considered during the calculation,the position of the sliding surface will be changed and the safety factor will be unreasonable.

关 键 词：临界滑动场 深基坑 稳定性分析 支护结构 

分 类 号：P642[天文地球—工程地质学]