综合物探方法在岩溶区桩基勘察中的应用分析  

Application of comprehensive geophysical prospecting methods in the pile foundation geotechnical investigation in karst region

作　　者：万文涛 郭清石 邓书鹏 Wan Wentao;Guo Qingshi;Deng Shupeng(Jiangxi Communications Design and Research Institute Co.Ltd,Nanchang 330002,China;Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]江西省交通设计研究院有限责任公司,南昌330002 [2]成都理工大学,成都610059

出　　处：《工程勘察》2023年第7期72-78,共7页Geotechnical Investigation & Surveying

摘　　要：石灰岩地区地质条件十分复杂,岩溶发育的形态、延伸及分布缺乏规律,难以用单一的钻探勘察方法就能解决问题,往往需要与多种物探手段相结合。本文依托某高速公路桥梁桩基勘察项目,运用高密度电法初步圈定岩溶强发育区。针对岩溶强发育区,采用跨孔弹性波CT法和管波探测法逐排查明桩基附近岩溶发育情况,寻找可靠的桩基持力层,并给出合理的推荐桩长,最后结合具体案例分析了各种物探方法的优缺点。The geological environment of limestone area are very complex,and the shape,extension and distribution of karst development lack regularity,which is difficult to solve the problem only by drilling exploration,the combination of a variety of geophysical exploration methods are often required.The strong karst development area are preliminarily delineated using high-density electrical method in a highway bridge pile foundation investigation project.For areas with strong karst development,the cross-hole elastic wave CT method and the tube wave detection method are used to investigate the karst development situation near the pile foundation row by row,to determine the reliable pile fonding statum,and to propose a reasonable pile length.Finally,the advantages and disadvantages of various geophysical methods are discussed according to the engineering case.

关 键 词：岩溶 高密度电法 跨孔弹性波CT法 管波探测法 桩基持力层 

分 类 号：P631[天文地球—地质矿产勘探]