一种深基坑开挖风险控制方法设计与仿真

Design and Simulation of Risk Control Method for Deep Foundation Pit Excavation

采用目前方法对深基坑开挖风险进行控制时,无法有效地分析深基坑开挖过程中存在的风险因素,导致方法存在风险识别率低、风险误判率高和风险控制效果差的问题。提出复杂地质条件下深基坑开挖风险控制方法,在“4M1E”系统安全理论的基础上采用事故树分析方法对深基坑开挖风险进行分析与识别,构建深基坑开挖事故树。构建深基坑开挖风险评价指标体系。体系由环境因素、人员因素、施工技术因素、机械设备因素、管理因素和施工材料因素构成,采用模糊综合评判法构建风险评判矩阵,对深基坑开挖风险进行评价,根据评价结果制定深基坑开挖风险控制策略,实现风险控制。仿真结果表明,所提方法的风险识别率高、风险误判率低、风险控制效果好。

Generally, the prediction of risk factors is essential in the process of deep foundation pit excavation. Traditional methods cannot effectively analyze the risk factors existing in the process of deep foundation pit excavation, resulting in a low-risk identification rate, high-risk misjudgment rate and poor risk control effect. This paper reports the risk control method of deep foundation pit excavation under complex geological conditions. According to the "4 M1 E" system safety theory, the fault tree analysis method was applied to analyze and identify the risk of deep foundation pit excavation in order to construct the fault tree of deep foundation pit excavation. Based on this, the risk evaluation index system of deep foundation pit excavation was established(including environmental factors, personnel factors, construction technology factors, mechanical equipment factors, management factors and construction materials factors). The fuzzy comprehensive evaluation method was used to construct the risk evaluation matrix for evaluating the risk of deep foundation pit excavation. According to the evaluation results, the risk control strategy of deep foundation pit excavation was formulated to realize risk control. The simulation results show that this method has a high-risk identification rate, low-risk misjudgment rate and excellent risk control effect.