大地电磁测深进行隧道围岩分级的可行性研究  

Research on Feasibility of Sorting Surrounding Rock of Tunnel with Telluric Electromagnetic Sounding

作　　者：许广春[1] 

机构地区：[1]铁道第三勘察设计院集团有限公司,天津300251

出　　处：《铁道工程学报》2010年第8期83-86,共4页Journal of Railway Engineering Society

摘　　要：研究目的:以往工作中,物探专业通过开展浅层地震折射法取得岩体纵波速度,但浅层地震折射法受理论以及震源能量限制无法取得深埋隧道洞身附近的岩体速度,使得围岩等级的划分缺少依据。寻求利用电性差异即应用大地电磁测深技术进行隧道围岩分级的研究是十分必要和迫切的。研究结论:浅层地震折射法在取得深埋隧道围岩的纵波速度方面存在很大限制;大地电磁测深法在铁路地质勘察中已成为主要方法,在电阻率区分上是有效的,其成果可以成为判断岩石完整性的依据,应用大地电磁测深技术进行隧道围岩分级是可行的。Research purposes：In the past geophysical prospecting,the p-wave velocity of terrane was obtained with shallow seismic refraction method.But with the shallow seismic refraction method,the terrane velocity nearby the deep buried tunnel portal could not be obtained because of the limitations of the theory and the hypocenter energy source.In that way,there was no enough evidence to sort the surrounding rock.So,it is necessary and urgent to do the research on sorting the surrounding rock with the technology of telluric electromagnetic sounding.Research conclusions：There are some very big limitations for getting the p-waves of the surrounding rock of deep buried tunnel with the shallow seismic refraction method.Therefore,the telluric electromagnetic sounding sounding has become the major method for railway geological exploration.Using the telluric electromagnetic sounding can effectively distinguish the resistivity and its outcomes can be as the basis to judge the integrity of surrounding rock,so it is feasible to use the telluric electromagnetic sounding to sort the surrounding rock.

关 键 词：大地电磁测深 电阻率 铁路勘察 围岩分级 可行性研究 

分 类 号：P319.12[天文地球—固体地球物理学]