高密度电法在叙大铁路凉水井段充水采空区探测中的应用  

Application of High-Density Electrical Method in Water-Filled Goaf Detection at Liangshui Well Section of Xu-Da Railway

作　　者：伍小刚 朱锐杰 寇正中 周世文 李彦彬 WU Xiaogang;ZHU Ruijie;KOU Zhengzhong;ZHOU Shiwen;LI Yanbin(The 6th Geological Brigade of Sichuan,Luzhou,Sichuan 646000)

机构地区：[1]四川省第六地质大队,四川泸州646000

出　　处：《四川地质学报》2025年第1期170-173,共4页Acta Geologica Sichuan

摘　　要：高密度电法是反映岩土体导电性变化的物探法,常被用于隧道勘察、隧道超前地质预报、地质灾害勘查和矿业勘察等领域。叙永至大村铁路凉水井段存在采空区,影响工程建设,由于采空区资料不详,采用高密度电法探测采空区位置和规模,测线基本沿线路布置(120个测点,测点间距5 m),将探测结果用于指导铁路改线。结果显示测点51~68间和测点70~118间存在低阻异常区,推测为采空区。为了验证物探结果的准确性,在测线上布置3个钻孔(ZK01~ZK03)进行验证,ZK01孔口以下39.80~41.30 m、ZK02孔口以下42.41~43.67 m和ZK03孔口以下35.46~37.22 m钻具掉钻现象,证明采空区存在,地下水埋深较浅(孔口下5~10 m),故该采空区为充水采空区,钻探结果表明高密度电法对充水采空区的探测是准确的。此次高密度电法对充水采空区的探测并结合钻探验证的经验可为类似工作提供一定参考。High-density electrical method is a geophysical exploration method that reflects the change of electrical conductivity of rock and soil,and is often used in tunnel investigation,tunnel geological prediction,geological disaster exploration and mining exploration.There is a goaf in the Liangshui well section of Xuyong to Dacun railway,which affects the construction of the project.Since the data of the goaf is unknown,High-density electrical method is adopted to detect the location and scale of the goaf,and the basic route layout of the survey line(120 measuring points,measuring point spacing of 5 m),and the detection results are used to guide the railway rerouting.The results show that there are low-resistance abnormal areas between 51-68 and 70-118 measuring points,which are presumed to be goaf.In order to verify the accuracy of the geophysical exploration results,three boreholes(ZK01~ZK03)were arranged on the survey line for verification.The drilling tools were emptied below ZK01 hole 39.80~41.30 m,below ZK02 hole 42.41~43.67 m and below ZK03 hole 35.46~37.22 m,proving the existence of goaf.The underground water depth is shallow(5~10 m below the hole),so the goaf is a water-filled goaf.The drilling results show that the high-density electric method is accurate in the detection of water-filled goaf.The exploration of water-filled goaf by high-density electrical method combined with the experience of drilling verification can provide some reference for similar work.

关 键 词：采空区 高密度电法 钻探验证 

分 类 号：P319.2[天文地球—固体地球物理学]