高密度电阻率法在高速公路不良地质体勘探中的应用  

The Application of High Density Resistivity Method to Prospecting Defective Geological Bodies of Highways

作　　者：龚术 张智[2] Gong Shu Zhang Zhi(Hunan Nonferrous Geological Prospecting Research Institute, Changsha Hunan 410015, China School of Geosciences , Guilin University of Technology, Guilin Guangxi 541004, China)

机构地区：[1]湖南省有色地质勘查研究院,湖南长沙410015 [2]桂林理工大学地球科学学院,广西桂林541004

出　　处：《工程地球物理学报》2016年第6期765-774,共10页Chinese Journal of Engineering Geophysics

基　　金：国家自然科学基金项目(编号:41574078;41274070);广西自然科学基金项目(编号:2013GXNSFAA019271;2015GXNSFAA139238);广西壮族自治区地质资源与地质工程"八桂学者"经费专项(编号:2013GXBG13015)

摘　　要：为了寻找高速公路建设中不良地质体的分布位置及范围和地表下岩溶发育情况,探查地表下方30m深度内的大溶洞和地下暗河情况等不良地质体,利用高密度电阻率方法对汕昆高速公路阳朔至鹿寨施工段进行了勘察。通过对野外数据的精细处理和和反演解释,得到如下结论：WK0410线36~52m处以及55~68m处为溶洞,并且有充填物,顶部深约为16.5m和14.5m;WK6960线40~52m处以及60~65m处为溶洞,顶部深均约为10m;K11＋445中桥34~44m处有一无充填溶洞,顶深约为10m,66~74m处有一局部高阻异常,推断为无充填溶洞,顶深约为6m;WK12080线52m处有一接触界面,接触面的倾角为80°~85°,该界面的西北方向岩石较为完整,东南方向裂隙较为发育;马岭河大桥中层为含水较丰富的圆砾,下层为灰岩;狮子岭大桥48~68m处以及80~88m处为含水及其他充填物的溶洞,前者顶深约为10m,后者顶深约为7.5m;蒲芦互通上层为较为含水的黏土,下层为泥灰岩;大坪子隧道15~340m表层为较为干燥的黏土层,190~210m、250~340m之间为含水的岩体破碎带,其余区域为较为完整的泥岩。This paper prospects the construction section from Yangshuo to Luzhai of Shankun highway by the high density resistivity method,in order to find the distribution position and scope of bad geological bodies in the highway-building and the developmental condition of subsurface karst,to probe the bad geological bodies under the condition of big karst caves below the surface of 300 meters and the condition of underground rivers.After processing intensively field data and conducting inversion interpretation on the field data,conclusions are obtained as follows：the karst cave lies in 36~52meters and 55~68meterswith filling materials in the WK0410 line,and the top depth of the karst caves are located at16.5meters and 14.5meters.The karst cave in the WK6960 line is located at 40~52meters and 60~65 meters and the top depth of karst cave is about at 10 meters.There is a karst cave without filling between 34~44 meters of K11＋445bridge,the top depth of karst cave about 10 meters.It is inferred as an unfilled karst cave between 66~74meters for there is a part of abnormal high resistivity and the top depth is at about 6meters.There is a contact interface whose inclination angle is 80~85degrees,at 52 meters of WK12080 line,and the rock interface located at northwest direction is complete and fracture in the southeast direction is more developmental.There exists some round gravels with relatively abundant water in the middle layer of Maling river bridge,the lower layer of which is full of limestone.Karst cave containing water and other fillings are placed at 48~68meters and88~95meters in the lion ridge bridge,and the former top depth of karst cave is about 10 meters,the latter top depth is about 7.5meters.Clay with more water is at the upper layer of Pulu exchange section,lower layer of which is filled with marl.The relatively dry clay layer is at 15~340meters of Daping tunnel,the rock fracture zone with water is between190~210meters and 250~340meters,and complete mudstones exist in the rest of the region of the section.

关 键 词：高速公路 高密度电阻率法 溶洞 断层 

分 类 号：P631.3[天文地球—地质矿产勘探]