对某隧道基坑工程的施工监测数据进行了分析，得出了基坑开挖施工过程中，桩-内撑支护结构中桩体的水平位移随开挖深度的变化规律。提出了该种结构可靠度指标并编制了基于Monte Carlo法的深基坑支护结构桩体水平位移可靠度分析程序。对实例工程的四个施工工况分别进行了计算，结果表明：可靠度分析计算结果与实例监测结果一致，符合性好。%On a certain tunnel construction monitoring data of foundation pit engineering is analyzed, it is conclud⁃ed that, in the process of excavation of the pile-stay within a horizontal displacement of supporting of pile a with the change rule of the excavation depth. This kind of structure reliability index is presented and is established based on the Monte Calor method for pile retaining structure of deep foundation pit horizontal displacement reli⁃ability analysis program. For the working condition of four construction of engineering cases are calculated respec⁃tively, the results show that the reliability calculation results agree with monitoring results, and good conformity.
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