综合地球物理勘探在铁路隧道高压气体勘探中的应用  

Application of Comprehensive Geophysical Exploration in High Pressure Gas Exploration of Railway Tunnels

作　　者：姚志勇[1,2] 李响 赵文[1,2] 蔡少峰 张志亮[1] 季备 朱光喜[3] YAO Zhiyong;LI Xiang;ZHAO Wen;CAI Shaofeng;ZHANG Zhiliang;JI Bei;ZHU Guangxi(China Railway First Survey and Design Institute Group Ltd.,Xi'an 710043,China;Shaanxi Railway and Underground Traffic Engineering Key Laboratory(FSDI),Xi'an 710043,China;China Railway First Survey and Design Institute Group Co.,Ltd.,Lanzhou 730000,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043 [2]陕西省铁道及地下交通工程重点实验室(中铁一院),西安710043 [3]中铁第一勘察设计院集团有限公司甘肃勘察院,兰州730000

出　　处：《铁道标准设计》2020年第5期120-125,136,共7页Railway Standard Design

基　　金：中铁第一勘察设计院集团有限公司科技研究开发计划项目(院科19-08)。

摘　　要：西宁至成都铁路勘察阶段XCDCSZ-3-1号深孔突发高压CO2气体,具有压力大、持续喷发时间长、对环境影响大、气体封堵专业性强及现场处置麻烦的特点。在收集、分析区域地质、深孔钻探、气体样品资料的基础上,认为高压CO2气体为无机成因,基底大理岩受热分解产生,主要聚集在基底不整合面界面,主控因素为基底构造。以1-1′为标准物探剖面,通过综合地球物理勘探手段和合理的物探测线布置,快速、有效、安全的查明基底构造分布规律。研究认为:采用二维地震反射法、音频大地电磁法两种物探手段相互验证、综合解译,查明海东南山特长隧道发育走向近东西、枢纽东倾的鼻状隆起构造,是高压CO2气体存储、运移的主控构造,分析鼻状隆起构造与线路的关系,达到优化线路方案绕避高压气体的目的。The carbon dioxide gas, outbursting in the deep borehole of XCDCSZ-3-1 during the investigation stage of Xi’ning-Chengdu Railway, is characterized by high pressure, long duration of eruption, great environmental impact, strong specialty in gas plugging and troublesome on-site disposal. On the basis of collecting and investigating regional geology data, deep-hole drilling data and gas sample data, it is considered that the origin of high-pressure CO2 gas is inorganic. High-pressure CO2 is generated by thermal decomposition of basal marble, mainly gathering at the interface of the basement unconformity and controlled by basement tectonics. Through comprehensive geophysical explorations and reasonable geophysical detection line arrangement and taking 1-1′ as the standard geophysical profile, the distribution law of basement tectonics can be quickly, effectively and safely ascertained. With comprehensive interpretation and mutual verification of the two-dimensional seismic reflection method and audio-frequency magnetotelluric method, it is found that the Haidongnanshan Tunnel has a nose-shaped uplifted structure with a strike direction near east-west and an eastward inclination of the axis, which forms the main control structure to transport and deposit high-pressure CO2 gas. And the relationship between uplifted structure and railway line is clarified, then the goal of optimizing the line scheme to avoid high pressure gas region is reached.

关 键 词：高压气体 二维地震反射法 音频大地电磁法 综合解译 铁路隧道 

分 类 号：P631[天文地球—地质矿产勘探] U452.1[天文地球—地质学]