Adaptability Evaluation on Gas Drainage of Tunnels in Non-Coal Measure Strata
(1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500; 2. Research Institute of Underground Space Development and Utilization, Southwest Petroleum University, Chengdu 610500)
Abstract：
In order to evaluate whether tunnel gas in the non-coal measure strata can be depressurized and emitted through the gas drainage means, a gas tunnel in the non-coal measure strata is taken as the research caset. Based on the characteristics of the gas tunnel in non-coal measure strata, a comprehensive evaluation method with fuzzy mathematics is used to establish an adaptability evaluation model for tunnel gas drainage in the non-coal measure strata. An adaptability evaluation system is established for gas drainage in non-coal measure strata tunnels from three aspects:gas occurrence control factors, feasibility control factors for gas drainage and drilling stability control factors. Ten basic factors are selected as evaluation indicators. The product scale method based on the Analytic Hierarchy Process is used to calculate the weights of evaluation indicators. A membership function that can quantitatively characterize the membership degree of each evaluation indicator factor is constructed.and Class I and Class Ⅱfuzzy comprehensive evaluation models are establish. This can assign corresponding scores to each remark in the evaluation vector,and achieve uniformization of the evaluation vector, thus determing the gas drainage adaptability in tunnels in the non-coal measure strata, and conducting verification and analysis in combination with instances. The results show that the adaptability of the full-section advance gas drainage in the high gas content section of the Mazui Tunnel on the Nanchuan-Daozhen Expressway is Class B (relatively adaptive), and theoretical and practical response measures are in good agreement.
ZHANG Junwei1,
2 GAO Xia1 WANG Haoquan1
.Adaptability Evaluation on Gas Drainage of Tunnels in Non-Coal Measure Strata[J] MODERN TUNNELLING TECHNOLOGY, 2023,V60(5): 20-29
2023, Vol. 60 