复杂地表条件对瞬态瑞雷波法探测软弱夹层的影响研究  

Influence on the detection of soft layer by Rayleigh-wave under the condition of complex terrain

作　　者：李建宁[1] 张平松[1] 郭立全[1] 吴荣新[1] LI Jian-ning;ZHANG Ping-song;GUO Li-quan;WU Rong-xin(School of Earth and Environment, Anhui University of Science and Technology, Anhui Huainan 232001, China)

机构地区：[1]安徽理工大学,地球与环境学院,安徽淮南232001

出　　处：《地球物理学进展》2018年第2期830-834,共5页Progress in Geophysics

基　　金：安徽省教育厅自然科学研究重大项目(KJ2016SD17); 安徽省学术和技术带头人科研活动经费资助项目(2016D079)联合资助

摘　　要：复杂地形条件下,瞬态瑞雷波法对软弱夹层的探测精度会受到影响.文章采用交错网格高阶有限差分法,构建不同地表条件下三组瑞雷波数值模型,讨论地表条件对瑞雷波传播波场的响应特征,以及对软弱夹层频散曲线中"之"字形结构的影响.结果表明:利用"之"字形结构拐点可较为准确的判断软弱夹层的存在及其位置,但在不同地表条件下,向下台阶型及凹陷型对瑞雷波探测软弱层影响程度较大,在现场探查应用中应加以校正或避免.Under the condition of complex terrain,the detection precision of the transient Rayleigh-wave method for weak interlayer will be affected. In this paper,staggered grid high-order finite difference method is used to build three groups of Rayleigh-wave numerical models to response characteristics of surface conditions to the propagating wave field of Rayleigh-wave, as well as the influence on the＂zigzag＂structure in the dispersion curves of weak interlayer. The results show that the existence and location of the weak interlayer could be accurately judged by the inflection point of the zigzag structure. However,under different surface conditions,the downward step type and depression type have great influence on the detection of soft layer by Rayleigh-wave, which should be corrected or avoided in field exploration.

关 键 词：瑞雷波 有限差分法 软弱夹层 复杂地表条件 频散曲线 

分 类 号：P631[天文地球—地质矿产勘探]