高密度电法在隧道工程勘察中的应用研究  

Application Research of High-density Electrical Method in Tunnel Engineering Survey

作　　者：桂鹏 GUI Peng(Anhui Building Materials Geological Engineering Survey Institute Co,Ltd,Hefei 230088,China)

机构地区：[1]安徽建材地质工程勘察院有限公司,合肥230088

出　　处：《建材世界》2024年第2期129-132,共4页The World of Building Materials

摘　　要：为圈定隧道隐伏地质构造、查明地层分布和岩性,以贵池区公共矿产品运输廊道建设项目为研究对象,运用高密度电法温纳-施伦贝尔装置对场区岩土体的视电阻率进行实测,分析隧道洞身段地层岩性、岩体风化程度、隐伏地质构造的分布及基岩面起伏形态。结果表明,C1-02、C1-03隧道段基岩地层为志留系下统高家边组中~微风化石英砂岩、粉砂岩、粉砂质泥岩;整个隧道段地层总体分为两层,浅部呈低电阻率为第四系残坡积层(含基岩风化层),深部高电阻率层为志留系下统高家边组中~微风化细砂岩、粉砂岩、粉砂质泥岩的反映;C1-02隧道洞身段共圈定2处断裂构造异常,均呈低阻断异常反映,分别为F21断裂构造位于隧道里程K2+513处,走向北东,倾向南东,产状较陡;F22断裂构造位于K1+988处,走向北东,向南东倾斜;C1-03隧道入口处K2+710~K2+800呈低阻异常反映,解译为浅部覆盖层厚度较大。In order to delineate the hidden geological structure of the tunnel,determine the distribution and lithology of the strata,the construction project of the public mining product transportation corridor in Guichi District is taken as the research object.The high-density electrical method Wenner Schlumberger device is used to measure the apparent resistivity of the rock and soil in the site,analyze the lithology of the ground layer in the tunnel body section,the degree of rock weathering,the distribution of hidden geological structures,and the undulating shape of the bedrock surface.The results show that the bedrock strata of the C1-02 and C1-03 tunnel sections are medium to slightly weathered quartz sandstone,siltstone,and sandy mudstone of the Lower Silurian Gaojiabian Formation;The overall geological strata of the entire tunnel section are divided into two layers.The shallow layer has a low resistivity and is composed of the Quaternary residual slope layer(including the weathered bedrock layer),while the deep layer with high resistivity is a reflection of the middle to slightly weathered fine sandstone,siltstone,and sandy mudstone of the Lower Silurian Gaojiabian Formation;There are two abnormal fault structures delineated in the body section of the C1-02 tunnel,all of which reflect low blocking anomalies.The F21 fault structure is located at the tunnel mileage K2+513,running northeast and leaning southeast,with a steep attitude;The F22 fault structure is located at K1+988,trending northeast and tilting southeast;At the entrance of the C1-03 tunnel,K2+710~K2+800 show a low resistance anomaly,which is interpreted as a thicker shallow covering layer.

关 键 词：高密度电法 隧道工程 低电阻率 矿产品 运输廊道 断裂构造 

分 类 号：U452.1[建筑科学—桥梁与隧道工程] P631.32[交通运输工程—道路与铁道工程]