高密度电法在查明隧洞砂化白云岩不良地质体的应用  

The application of a high-density electrical method in detecting the bad geological body of sandy dolomite in tunnel

作　　者：王子铭 米健 郑广宇 查宇翔 苏利明 WANG Ziming;MI Jian;ZHENG Guangyu;ZHA Yuxiang;SU Liming(Yunnan Institute of Water&Hydropower Engineering Investigation,design Co.,Ltd.,Kunming 650021,China;Yunnan Institute of Water&Hydropower Engineering Investigation,Design and Research,Kunming 650021,China)

机构地区：[1]云南省水利水电勘测设计院有限公司,昆明650021 [2]云南省水利水电勘测设计研究院,昆明650021

出　　处：《物探化探计算技术》2025年第2期282-292,共11页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：云南省重大科技专项项目(202002AF080003)。

摘　　要：滇中引水工程玉溪段扯那苴隧洞穿越富水砂化白云岩不良地质体地层,涌水涌砂灾害频繁发生,给施工安全、难度和进度带来了挑战。应用高密度电法对滇中引水工程玉溪段扯那苴隧洞改线段进行物探勘察,结合前期勘察及施工地质资料,查明扯那苴隧洞改线段砂岩与白云岩的分界线,并推断出断层构造和岩溶破碎带的空间展布。通过钻孔岩芯编录、钻孔声波测试和钻孔电视成像进行物探成果验证,与高密度电法探测结果基本吻合,表明高密度电法适用于隧洞砂化白云岩不良地质体勘察,具有优质、高效的特点,在砂化白云岩隧洞勘察中探测地质构造、岩性界线和岩溶发育情况是一种有效的物探手段,为隧洞改线论证提供了科学依据。The Chenaju tunnel of Yuxi section of the central Yunnan water diversion project passes through the water-rich sandy dolomite bad geological body stratum,and the water and sand gushing disasters occur frequently,which pose challenges to the construction safety,difficulty and progress.The high-density electrical method is used to carry out geophysical exploration on the rerouted section of Chenaju tunnel in Yuxi section of the central Yunnan water diversion project.Combined with the previous investigation and construction geological data,the boundary between sandstone and dolomite in the Chenaju tunnel's rerouted section is found,and the spatial distribution of fault structure and karst fracture zone is inferred.The geophysical exploration results are verified by borehole core logging,borehole acoustic wave test and borehole TV imaging,which are consistent with high-density electrical method's detection results.It shows that the high-density electrical method is suitable for investigating bad geological bodies of sandy dolomite in tunnels.It has the characteristics of high quality and high efficiency.It is an effective geophysical exploration method to detect geological structure,lithology boundary,and karst development in the investigation of sandy dolomite tunnels,and it provides a scientific basis for the demonstration of tunnel rerouting.

关 键 词：滇中引水工程 高密度电法 砂化白云岩 岩性界线 

分 类 号：P631.3[天文地球—地质矿产勘探]