CSAMT法在昆玉线宝峰深埋隧道勘察中的应用  

Application of CSAMT exploration in Baofeng tunnel of Kunming-Yuxi Railway

作　　者：闵刚[1] 王绪本[1] 李坚[2] 雷旭友[2] 余年[1,2] 

机构地区：[1]成都理工大学地球探测与信息技术教育部重点实验室,四川成都610059 [2]中国中铁二院工程集团有限责任公司地勘岩土公司,四川成都610031

出　　处：《煤田地质与勘探》2012年第3期78-81,共4页Coal Geology & Exploration

基　　金：国家自然科学基金项目(40074036)

摘　　要：宝峰深埋隧道洞深附近地质情况复杂,需对岩体完整性进行评价。依据可控源音频大地电磁法(CSAMT)的带地形二维非线性共轭梯度(NLCG)反演结果,把电阻率异常分为Ⅴ类、Ⅳ类、Ⅲ类及Ⅱ类,分别对应极破碎岩体(Ⅴ级围岩)、破碎岩体(Ⅳ级围岩)、较破碎岩体(Ⅲ级围岩)和完整岩体(Ⅱ级围岩)。结合围岩分级结果,查明了宝峰深埋隧道洞深附近岩性、断层破碎带及岩溶位置,对岩体完整性进行了评估。经钻孔及地质资料验证,CSAMT勘探达到了预期效果。Based on the NLCG inversion results of CSAMT, resistivity anomaly of CSAMT data were divided into four types （type V, type IV, type III and type II ）, four tunnels （route） in the lines were compared and one of them was recommended in the light of engineering geological condition- based extent of anomaly and hard rock. Ac- cording to the rock classification results, we identified the distribution of fault fracture zone and karst area, and we also assessed the integrity of the rock. Verified by drilling and geological data, CSAMT exploration reached the desired results.

关 键 词：CSAMT 隧道 电阻率异常 围岩分级 断层破碎带 岩溶发育区 

分 类 号：P631[天文地球—地质矿产勘探]