基于模糊评判理论的深基坑施工风险评价

深基坑工程建设过程涉及大量不确定因素,随着基坑开挖深度与规模增加,面临的风险也越多。因为风险具有必然性、动态性、多样性和模糊性等特点,风险评估结果往往不能用单一指标完全表达。本文以郑州轨道交通车站深基坑为工程背景,利用现场监测数据,对于深基坑施工期间内潜在的风险采用模糊数学综合评判理论进行评价。首先,分析基坑监测的数据,据此对基坑主体以及周边环境进行安全性评估,在此基础上建立基坑施工安全状态评价体系并建立与之对应的因素集;然后,假设每一单因素所属函数是相同的,且都符合线性分布,得到深基坑在不同安全条件下的隶属函数;最后,采用层次分析法并结合工程经验,确定安全评价指标权重集及评判模型。综合评判得出本基坑整体工程综合评分为91.6,表明基坑是安全的。

Risk Assessment on Deep Excavation Construction Based on Fuzzy Evaluation Theory

The construction process of deep excavation engineering involves a large number of uncertain factors. With the increase in excavation depth and scale, more and more risks are encountered in engineering. With the characteristics of inevitability, dynamic, diversity and ambiguity, the risk assessment results cannot be expressed by a single index. Based on the Zhengzhou rail transit station excavation work and field monitoring data, this paper evaluates the risk of deep excavation construction process by using fuzzy math theory. Firstly, the security of deep excavation and surrounding environment are assessed according to the monitoring data, and the safety state of construction and factor set are established. Then, assuming that every single factor membership function is the same, obeying the linear distribution and the subordinate functions at safety status are gained; Finally, using the analytic hierarchy process and engineering experience, the safety evaluation index weight set and judgment model can be determined. The comprehensive evaluation shows that the whole comprehensive score of this excavation is 91.6, which indicates that this work is safe.