综合物探方法在南宁地铁溶洞探测中的应用

发布时间：2018-05-02 17:23

本文选题：溶洞探测 + 高密度电法　；参考：《地球物理学进展》2017年03期

【摘要】：随着城市化进程的加速,城市轨道交通得以快速发展.地铁成为未来城市主要交通建设方向之一.溶洞的地质特征又是地铁施工中的难点.本次研究区位于南宁市境内,地铁线路将穿越邕江堆积、河谷阶地区、溶蚀残丘谷地区和侵蚀、剥蚀丘陵区.经初步勘察发现研究区有多处溶洞且该段地处市中心,车流量较大、地下管线较复杂,以商业和居住为主.为了查明研究区溶洞发育情况,结合当地地质构造条件且考虑到地球物理存在多解性的特点.采用高密度电法与地质雷达相结合对研究区内的溶洞进行探测,其中地质雷达用来填补高密度电法勘探效果不理想的区域(例如沥青或混凝土路面).两种方法相互结合达到研究区全面覆盖的目的.进而对研究区的溶洞性质和溶洞空间发育形态进行确定,再通过钻孔对比验证取得了良好效果.物探方法共推断9处溶洞的研究结果表明地质雷达可以较好的填补高密度电法勘探效果不理想的区域.使这种综合物探方法针对溶洞探测获得了较好的效果.最终为工程设计及施工提供了可靠的依据.
[Abstract]:With the acceleration of urbanization, urban rail transit can develop rapidly. Subway will become one of the major traffic construction directions in the future. The geological characteristics of karst cave are also the difficult points in subway construction. The study area is located in Nanning City, the subway line will pass through the accumulation of Yongjiang River, the river valley terrace, the area of the dissolved hilly valley and the erosion and denudation hilly area. Through preliminary investigation, it is found that there are many karst caves in the study area, which is located in the center of the city, with a large traffic flow and complicated underground pipelines, mainly in commercial and residential areas. In order to find out the development of karst caves in the study area, combined with the local geological structural conditions and taking into account the existence of geophysical characteristics of multiple solutions. The high density electric method combined with the ground penetrating radar (GPR) is used to detect the cave in the study area. The GPR is used to fill the area (such as asphalt or concrete pavement) where the exploration effect of the high density electrical method is not satisfactory. The two methods are combined to achieve the purpose of comprehensive coverage of the study area. Furthermore, the properties of the cave and the spatial morphology of the cave were determined, and good results were obtained by drilling comparison. The research results of 9 caverns inferred by geophysical prospecting method show that GPR can fill the area where the effect of high density electrical exploration is not satisfactory. The comprehensive geophysical exploration method has been proved to be effective for cave detection. Finally, it provides a reliable basis for engineering design and construction.
【作者单位】：东华理工大学地球物理与测控技术学院;中铁时代建筑设计院有限公司;东华理工大学测绘工程学院;中核通辽铀业有限责任公司;
【基金】：基于电测井的裂缝正演模拟研究基金资助项目(GJJ150579)
【分类号】：P631;U231.1

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