隧道反射波层析成像正反演模拟与TRT反演的对比分析  

Forward and Inversion Simulation of Tunnel Reflection Wave Tomography and a Contrastive Analysis of TRT Inversion

作　　者：彭炎 方慧[1,2] 吕琴音 PENG Yan;FANG Hui;LV Qinyin(Institute of Geophysical and Geochemical Exploration,CAGS,Langfang 065000;The National Center for Geological Exploration Technology,Langfang 065000)

机构地区：[1]中国地质科学院地球物理地球化学勘查研究所,廊坊065000 [2]国家现代地质勘查工程技术研究中心,廊坊065000

出　　处：《现代隧道技术》2020年第1期105-114,共10页Modern Tunnelling Technology

基　　金：中国地质科学院基本科研业务费项目(AS2016J11)

摘　　要：由于隧道反射层析成像技术(TRT)仅支持10个接收点以内的观测系统进行超前预报和反演,而且在施工中常有坏道情况,导致有效接收点道数不足10道,严重地影响了工作进度,极大地限制了该仪器的实用性。基于此,文章通过推导得出隧道拱面上观测系统直达波和反射波的走时公式,结合波前扩散原理,借鉴TRT反演技术原理,得出了隧道拱面上任意布置接收点和震源点的正反演方法。该方法可以达到和TRT软件一致的反演结果,并且不受道数限制,在有坏道的情形中,保证有足够的有效道数参与反演,可为研制更加经济实用国产设备提供方法条件。As for the tunnel reflection tomography(TRT),receiving points only within 10 channels can be installed and used for inversion,and due to destruction in installation,the numbers of effective receiving points are often less than 10 channels,which seriously affects the work progress and greatly limits the practicability of the instrument.In view of this,the travel time formulae for the direct wave and reflected wave of observing system on tunnel arch sur⁃face are deduced.And the forward and inversion method for the random receiving point and seismic focus point on tunnel arch surface is obtained based on the principles of wavefront diffusion and TRT inversion technology.With this method,the inversion results comply with that of TRT software with no restriction by channel numbers,ensuring enough effective channels involving in inversion in the case of some bad channels.

关 键 词：超前预报 反射波层析成像技术 正反演模拟 直达波 反射波 震源点 有效道数 

分 类 号：U456.33[建筑科学—桥梁与隧道工程]