基于EW-AHP和未确知测度理论的隧道瓦斯风险评价

铁路隧道施工中很多需要穿越瓦斯地层，施工的安全风险较高。为提高隧道瓦斯风险评价的准确性，基于未确知测度理论，建立铁路隧道瓦斯风险评价模型。以兴泉铁路于都二号隧道工程为依托，选取影响瓦斯风险的9个因素作为评价指标，并建立各评价指标的分级标准，运用乘法归一化方法将层次分析法和熵权法计算的权重耦合成综合权重，再由综合权重和评价指标的未确知测度矩阵确定多指标综合测度评价向量，最后根据置信度识别准则确定隧道瓦斯风险等级。研究结果表明:此评价模型相对于传统评价模型能够提高隧道瓦斯风险评价的准确性，且与实际施工情况高度吻合，可作为类似隧道项目施工中的瓦斯风险有效评价模型。 

Tunnel gas risk assessment based on EW-AHP and unascertained measurement theory

In the construction of railway tunnel, many need to pass through the gas stratum so that the safety risk of construction is quite high. A railway tunnel gas risk assessment model based on the unascertained measurement theory was established to improve the accuracy of tunnel gas risk assessment. Yudu No.2 tunnel project of Xingquan railway was taken as a case study. Nine factors affecting gas risk were selected as evaluation indexes, and their grading standards were established. The weight calculated by AHP and entropy weight method was coupled into comprehensive weight by using the method of multiplication normalization, and then the comprehensive weight and the unascertained measure matrix of evaluation index were used to determine the multi index comprehensive measure evaluation vector. Finally the risk level of tunnel gas was determined according to the confidence recognition criteria. The results showed that: compared with the traditional evaluation model, this evaluation model could improve the accuracy of tunnel gas risk evaluation, and it was highly consistent with the actual construction situation, and could be used as an effective evaluation model for gas risk in similar tunnel projects.