高寒艰险山区和复杂地质条件的铁路物探  

Railway Geophysical Prospecting of Alpine Mountainous Areas with Complex Geological Condition

作　　者：李坚[1] 马文德[1] 吴正刚[1] 尹小康[1] 曹云勇[1] 

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《铁道工程学报》2015年第8期5-11,共7页Journal of Railway Engineering Society

摘　　要：研究目的:新建铁路川藏线拉萨至林芝段位于西藏高寒山区峡谷地段,隧道占该段线路长度的53%,由于隧道深孔钻探困难等原因,大量地采用天然场音频大地电磁法(AMT)进行隧道物探。因缝合带是西藏特有的地质构造产物,根据工程物探资料直接解释缝合带目前国内外带鲜见公开文献报道。因此,本次物探在现有后勤保障体制下,面对缺氧、低温等特殊环境困难并且保证尽可能多地采集有效资料的前提下,探讨物探工区的极限地面高程,并研究音频大地电磁资料与缝合带的对应关系和规律,为今后拟建世界上地形地质条件最为艰险复杂的川藏线康定至林芝段的铁路物探提供技术支撑和借鉴。研究结论:(1)在AMT资料采集方面,川藏线拉萨至林芝段物探与内地物探的差别非常大,物探人员面临高寒缺氧的极端环境、负重仪器和给养沿地形陡峻的隧道地面线行走并进行物探等巨大困难,因此在地形陡峻、地面高程超过4 500 m等极端困难地段,现有体制的后勤给养条件无法保证人员安全,难以采集物探资料,会出现大量资料空白;(2)在AMT资料处理和解释方面,川藏线拉萨至林芝段物探与内地物探没有差别;(3)在反演电阻率断面图中,向下贯通延伸的条带状低阻异常或梯度高值位置对应缝合带;(4)该研究成果可用于其他高寒山区的工程物探领域中。Research purposes： Lhasa to Linzhi section of Sichuan - Tibet Railway canyon area. The length of tunnel is 53% for the total length of line. Due to drilling is located in the alpine mountain difficulties for deep tunnel, a lot of work about the natural field audio frequency magnetotelluric method （AMT） has carried out for tunnel prospecting. Suture zone is the product of Tibet＇s special geological structure, and the suture zone is interpreted directly by the engineering geophysical data with rare public literature at home and abroad. Therefore, under the existing logistics system, in the face of difficult and hypoxia, low temperature and other special environment under the premise of guaranteeing as much as possible to collect effective information, this geophysical prospecting discusses the limit of ground elevation for geophysical prospecting work area, researches the corresponding relation and regularity between audio frequency magnetotellurie data and suture zone, is to prospecting on Kangding to Linzhi section of Sichuan - Tibet geological conditions in the world. provide technical support and reference for the geophysical Railway in future, which the most complex topographic and Research conclusions： （ 1 ） Data collection ： The difference of data collection for geophysical exploration between Lhasa to Linzhi section and general areas is very big, geophysical workers face the great difficulties such as environment of hypoxia, low temperature along the steep terrain, a footrace with heavy armor, instruments and supplies of tunnel ground walking. Therefore in the steep terrain and extremely difficult location where the ground elevation is more than 4 500 m, the existing system of logistics supplies condition cannot ensure the safety of the personnel, it is difficult to collect the geophysical data, so there would be a lot of data blank. （2） Data processing and interpretation： There is no difference between Lhasa to Linzhi section and general areas. （3） In the inverted resistivity prof

关 键 词：高寒艰险山区 复杂地质条件 AMT勘探 缝合带 

分 类 号：U212.2[交通运输工程—道路与铁道工程]