地下障碍物探测井中地震散射波成像数值模拟  

Numerical Simulation of Borehole Seismic Scattered Wave Imaging for the Detection of Underground Obstacles

作　　者：刘伍[1] 曾来[1] 司永峰[1] 沈恩来[1] 

机构地区：[1]上海市地质调查研究院,上海200072

出　　处：《上海国土资源》2012年第3期66-70,共5页Shanghai Land & Resources

基　　金：上海市规划和国土资源管理局科研项目"城市初始地下地籍调查"

摘　　要：井中地震具有多波接收、高精度、高分辨率、能量传播距离短、接近探测目标、避开低速带等优点,在工程中得到了越来越广泛的应用。地震散射波是由地下三维不均匀体引起的地震波的变化,因此散射波成像特征与不均匀体分布情况密切相关。采用声波方程有限差分法对城市地下不均匀体如桩基、深埋管道等的散射波成像特征进行了数值模拟和分析;根据理论模拟给出了多种探测方式,并讨论了各方式的适用条件及应注意的问题。为城市地下空间开发中地下障碍物探测提供了理论指导。Borehole seismic imaging has been widely applied in a variety of engineering projects, and its advantages include multi-wave receiving, accuracy, high resolution, a short energy transfer distance, ease of use, and the avoidance of low-speed zones. Scattered seismic waves are generated when the original waves pass through subsurface 3D inhomogeneous layers, and the imaging characteristics of such scattered waves are closely related to the characteristics of the inhomogeneous body. This paper discusses the numerical simulation and analysis of the imaging features of scattered waves from typical inhomogeneous bodies in urban underground spaces （e.g., piles and deep-buried tubes） by applying the finite difference method to the acoustic equation. Several detection methods are used in the theoretical simulations, with the relevant conditions and other important points highlighted for each method, and we present theoretical guidance for detecting underground obstructions in urban developments.

关 键 词：地下障碍物 地球物理探测 井中地震 地震散射波 数值模拟 

分 类 号：P631.443[天文地球—地质矿产勘探]