深基坑施工邻近既有隧道安全风险分析  

Safety Risk Analysis of Existing Tunnel Adjacent to Deep Excavation

作　　者：陈大川[1] 董玲 CHEN Dachuan;DONG Ling(College of Civil Engineering,Hunan University,Changsha,Hunan 410082,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《公路工程》2018年第6期40-45,145,共7页Highway Engineering

基　　金：国家自然科学基金资助项目(50778067)

摘　　要：为科学地评估深基坑开挖邻近既有隧道安全风险的大小,基于综合风险指数矩阵法建立可用于工程实践的安全风险评价体系。分析深基坑施工邻近既有隧道风险事件的主要风险源,从深基坑和既有隧道两个方面各选取四个风险指标;引入熵权法改进评价指标权重确定过程,提高评价体系的可靠性;通过对工程实例的统计及已有文献的总结,提出各指标等级赋值标准和评价准则;最后通过工程实例对评价体系进行验证,验证结果表明该评价体系能为工程决策提供有效参考。In order to assess the safety risk grade of existing tunnel adjacent to deep foundation pit excavation,a feasible safety risk assessment system was established on basis of synthetic risk index matrix method.According to the analysis of the main security sources,4 risk indexes from deep excavation and 4 risk indexes from existing tunnel were selected.Then,the dependability of the assessment system was enhanced by applying the entropy method into the process of determining weights.Based on the statistical analysis of actual project cases and the summary of former study,the scoring method for the evaluating indexes and the evaluation standard were put forward.Finally,the evaluation system was verified with project example.The verification results showed that the evaluation system can well provide some valid references for engineering decision.

关 键 词：深基坑 既有隧道 安全风险 综合指数矩阵法 熵权法 

分 类 号：X947[环境科学与工程—安全科学]