西安市地铁二号线地裂缝灾害风险评估  

Risk Assessment for Ground Fissure Disasters at Xi'an Metro Line 2

作　　者：王启耀[1] 滕宏泉 

机构地区：[1]长安大学建筑工程学院,西安710061 [2]陕西省地质环境总站,西安710054

出　　处：《地下空间与工程学报》2013年第4期954-958,共5页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金项目(No.50908018);中央高校科研基本业务费项目(No.CHD2010JC052)

摘　　要：考虑到西安市特殊的地质环境,地铁工程建设将会遇到严重的地裂缝灾害,工程建设的风险性较大。根据分析将地裂缝对地铁的灾害事件定义为地裂缝活动引起地铁隧道开裂和漏水,同时由模型试验和数值分析的结果,确定了西安地铁地裂缝灾害事件的地裂缝最小垂直活动量。在假定活动量满足正态分布的情况下,计算了灾害事件发生的概率,预测了各相交段灾害事件发生将会引起的价值损失,最后采用风险度R=F(C,P)的评价模型,计算得到了地铁二号线通过地裂缝的各段的风险度。结果表明:按常规的设计,西安地铁二号线在7个地裂缝地段的风险高或极高,需要采取特殊的工程措施来降低风险。Owing to special geological environment in Xi＇an, there will be great risk for serious ground fissure disasters in metro construction. The risk event involved in subway destruction is defined as structure cracking and leakage. Based on the results of model test and numerical analysis, the minimum sedimentation value of ground fissure disasters on subway was determined. Provided that the active value of ground fissures satisfied the normal distribution, by using the evaluation model of risk as R = F（ C ,P）, the risk degree of each segment at the point where the tunnel crossed ground fissures was calculated. The results showed that in normal design circumstances, there were seven high risk segments or ultra-high risk ones. Therefore, special measures should be taken to reduce risks for these segments with high risk or higher.

关 键 词：西安地铁 地裂缝 风险分析 期望损失 

分 类 号：TU921[建筑科学—建筑设计及理论]