摘要
介绍了两个高密度电阻率成像技术在中国西南铁路勘察中的应用实例。数据采集采用supersting~R8/IP高密度电法仪,采用5m道距,每个排列84道。依据野外装置试验结果,固定测量电极(MN)的施伦贝尔排列方式,随供电电极距(AB)增大,采集的数据质量变差,因而采用不同测量偶极距的施伦贝尔排列。在XM的应用实例中,高密度电阻率成像成功探测了喀斯特地貌区的浅地表结构,查明暗河和多处溶洞,探测结果表明:暗河区发育较大范围的低阻,岩溶主要表现为低阻圈闭特征。在DF的实例中,高密度电法主要用于探测隐伏的煤层和采空区,结果表明:煤层和软质岩类具有明显的低阻特征,在灰岩区有显著的电阻率差异,但由于煤层和采空区都呈现显著的低阻特征,因而高密度电法在探测煤层中的小采空区依然有较大的难度。试验结果表明,即便采用0.5m的道距,依然难以圈定采空区的形态和精确位置。
Two case histories of mapping the near surface for railway route investigation in SW China using high resolution resistivity imaging （ERI） are presented in the paper. A set of Superting R8/IP was used for data acquisition. Four cables with 84 passive stainless steel electrodes spaced 5 m apart were used. Based on the testing result, schlumberger with varied MN was used in data acquisition. The Schlumberger array with fixed MN as one trace space has poor data quality in while AB is move far from MN stakes. Case history in XM indicates that ERI could be successfully used for mapping the near surface in karst area, the underground river is characterized by lower risistivity, most karst caves features as low resistivity traps. Case history in DF indicate that ERI could be successfully used for mapping the coal bearing rocks and soft rocks, but it is hard to use ERI to shape and locate the coal goafs, even using the trace space as little as 0. 5 m.
作者
王思桐
李坚
曹礼刚
曹云勇
雷旭友
魏栋华
何兰芳
WANG Sitong LI Jian CAO Ligang CAO Yunyong LEI Xuyou WEI Donghua HE Lanfang(Chengdu University of Technology,Chengdu 610059 , China China Railway Eryuan Engineering Grou p,Chengdu 610031,China Chinese Academy of Sciences, Beijing 100029, China)
出处
《物探化探计算技术》
CAS
CSCD
2017年第2期219-223,共5页
Computing Techniques For Geophysical and Geochemical Exploration
关键词
高分辨电阻率成像
勘察
暗河
煤采空区
中国西南
high resolution resistivity imaging
route investigation
ground river
coal goaf
SW China
