成都市地铁深基坑施工风险评价实证研究

Empirical study on construction risk evaluation of deep foundation pit of Chengdu metro

地铁车站深基坑工程由于其周边环境的特殊性,往往给施工带来较大影响,需要对影响深基坑开挖的因素进行详细的风险评价,以避免在实际施工过程中发生风险事故。以成都地铁十七号线凤溪站深基坑工程为研究对象,提出富水卵石层深基坑施工开挖风险评价模型。通过专家走访调研并结合富水卵石层的施工特点确定了该工程的风险因素,采用层次分析法确定各级风险因素的权重指标,建立风险因素分级,根据模糊综合评判理论确定各级风险因素的风险等级水平,最终计算出总风险水平等级,并根据计算结果提出有针对性的措施,为成都地区地铁深基坑工程施工开挖的风险评价提供参考。

Due to the special nature of the surrounding environment,the deep foundation pit engineering of metro station often has a great impact on the construction.It is necessary to carry out detailed risk assessment on the factors affecting the excavation of deep foundation pit to avoid the risk in the actual construction process accident.The deep foundation pit engineering of Fengxi Station on the 17 th line of Chengdu Metro is taken as the research object,and the risk assessment model for deep excavation of deep foundation pit with water-rich pebble layer is proposed.The risk factors of the project were determined through experts’investigation and investigation combined with the construction characteristics of the rich water pebble layer.The analytic hierarchy process was used to determine the weight indicators of risk factors at all levels,the risk factors were graded,and the risk factors at all levels were determined according to the fuzzy comprehensive evaluation theory.At the level of risk level,the total risk level is finally calculated,and targeted measures are proposed based on the calculation results to provide reference for the risk assessment of the construction excavation of the deep foundation pit of the subway in Chengdu.