基于集对-可拓层次法的富水隧道围岩安全风险评价

Based on Set Pair-Extension Hierarchy Method,Safety Risk Assessment of Surrounding Rock in Water-Rich Tunnel is Presented

基于可拓学原理,选取岩体软化系数、地下水流量、岩体完整性指数、岩石单轴抗压强度、结构面状况、主要结构面与洞轴夹角6个评价指标建立富水隧道围岩安全风险评价体系。运用集对分析原理构建联系隶属度函数,采用层次分析法计算各个安全风险评价指标权重,根据最大隶属度原则,通过计算结果判断待评价隧道围岩安全风险等级。以油坊坪隧道DK387+330-DK387+600段为实例,根据评价指标现场实测值,计算得到围岩安全风险等级为中度风险,与现场实际情况相吻合,验证了基于集对-可拓层次法的富水隧道围岩安全风险评价模型的可靠性。

Based on the theory of extenics,the safety risk evaluation system of surrounding rock in water-rich tunnels was established by selecting six evaluation indexes,including rock mass softening coefficient,ground water seepage volume,integrity coefficient of rock mass,uniaxial compressive strength of structural surface,angle between main structural surface and tunnel shaft;Based on the principle of set pair analysis,the related membership function was constructed,and the weight of each safety risk evaluation index was calculated by AHP. According to the principle of maximum membership,the safety risk level of surrounding rock was determined by the calculation results.Taking the section DK387 + 330-DK387 + 600 of youfangping tunnel as an example,according to the field measured value of evaluation index,the safety risk grade of surrounding rock is calculated to be medium risk,which is consistent with the actual situation of the site,verifying the reliability of the safety risk evaluation model of surrounding rock of the water-rich tunnel based on the set pairingextension hierarchy method.