山岭隧道施工期静态与动态风险评估方法及应用

Static and dynamic risk assessment method of mountain tunnel during construction period and its application

为对隧道施工风险做出及时、准确判断,以便现场采取相应工程措施,预防隧道大变形、塌方灾害的发生,将多级加权迭代法和功效系数法应用于隧道定性与定量风险评价中,建立山岭隧道施工静态与动态风险评估模型。基于我国300多例隧道大变形、坍塌案例的统计分析,建立以地质、设计和施工因素为指标的静态风险评价指标体系,并制定指标打分标准;此外,将风险分析与监控量测相结合,确定动态风险评价指标。在对风口山隧道风险因素及监控量测分析基础之上,运用该模型对风口山隧道进行风险评价。研究结果表明:评价结果与实际施工情况一致,验证了该模型的有效性和适用性,为山岭隧道施工风险评估提供了新的研究思路和经验。

In order to make timely and accurate judgement on tunnel construction risk,so that corresponding engineering measures can be taken to prevent the occurrence of large deformation and collapse of the tunnel,the multi-level weighted iterative method and the efficiency coefficient method were applied to evaluate tunnel risk qualitatively and quantitatively,and the static and dynamic risk assessment model of the tunnel was established.Based on the statistical analysis of more than 300 cases of large deformation and collapse of tunnels in China,the static risk assessment index system was established with geological,design and construction factors as the index,and the index scoring stander was formulated.In addition,the dynamic risk assessment indexes were determined by combining risk analysis with monitoring measurement.Based on the analysis of risk factors and monitoring measurement,the model was used to evaluate the risk of the Fengkoushan tunnel.The results show that the evaluation results are consistent with the practical situation.And the method is effective and practical.It provides a new research idea and experience for the risk assessment of the mountain tunnel construction.