成都地铁龙泉山隧道瓦斯赋存特征分析与预测评价  

Characteristics Analysis and Forecast Evaluation of Gas Occurrence of the Longquanshan Tunnel on Chengdu Metro

作　　者：张小林[1] 蔡建华[2] 廖烟开[2] ZHANG Xiaolin;CAI Jianhua;LIAO Yankai(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031;China Railway Southwest Research Institute Co.,Ltd., Chengdu 611731)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031 [2]中铁西南科学研究院有限公司,成都611731

出　　处：《现代隧道技术》2019年第3期25-30,共6页Modern Tunnelling Technology

基　　金：国家自然基金面上项目(41372337)

摘　　要：针对隧道施工安全及瓦斯设防需要,文章首先从宏观上考察了四川盆地龙泉山区域地质背景及天然气构造,结合隧址区地质构造发育分布情况,认定成都地铁龙泉山隧道属非煤系地层瓦斯隧道,并指出其瓦斯构造的宏观特性。其次,结合钻孔天然气检测、物探测试及室内试验等详细勘察成果进一步进行细化,指出了龙泉山隧道瓦斯赋存的埋深、高程、地层、围岩等细观(工程)特性。最后,与即将贯通的龙泉山水工隧洞进行工程类比,并利用其瓦斯监测成果对以上特性进行校验,进行了针对成都地铁龙泉山隧道瓦斯赋存与设防等级的预测评价,为瓦斯灾害预测预防提供决策依据。In light of the tunnel construction safety and gas fortification,the regional geological background and gas structure of the Longquan Mountain in Sichuan Basin were investigated from a macro perspective,the Longquanshan tunnel of Chengdu Metro was identified as a gas tunnel in non-coal measure strata considering the development and distribution of geological structure at tunnel site,and its macroscopic characteristics of gas structure were presented.Based on the detailed exploration results of gas detection,geophysical exploration and laboratory test of boreholes,the microscopic characteristics of gas buried depth,elevation,strata and rock mass of the Longquanshan tunnel were stated.By comparing with the Longquanshan water tunnel to be completed soon,the above mentioned characteristics were proved by gas monitoring results,and a prediction and evaluation of gas occurrence and fortification grade of the Longquanshan tunnel were conducted.

关 键 词：成都地铁 龙泉山隧道 瓦斯赋存 浓度 检测监测 预测 

分 类 号：U456.33[建筑科学—桥梁与隧道工程] TU452[交通运输工程—道路与铁道工程]