通过全国各地城市轨道交通基坑工程实测案例分析，研究基坑围护桩( 墙) 及周边地表的变形特点和监控要求。对不同监测项目的实测结果进行数理统计分析，结合相关研究成果和技术规范要求、分场地土类型给出变形监测控制指标的建议数值，合理评价基坑工程的安全状态。基坑工程变形监测控制指标的影响因素众多，工程实际应继续深入开展相关研究，以提高基坑工程的安全风险管控水平。

Based on the actual cases study of many cities in China，authors analysed the deformation characteristics and controlindexes of retaining structure and surrounding ground of the foundation pit engineering of urban rail transit． Measured results wereprocessed by statistical analysis． According to related research results and technical codes，the recommended controlled values fordeformation were given for different soils which can reasonably evaluate the safety state of foundation pit engineering． Deformationmonitoring controlled indexes are affected by many factors and in － depth research should be carried out to improve the safety riskcontrol level of foundation pit engineering．

U239． 5

中共北京市委组织部：北京市优秀人才培养资助个人项目（2012ZG-40）