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反射波法隧道超前地质预报地震波走时模拟研究

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隧道施工安全常常由于复杂的地质情况面临着巨大的挑战,反射波法地震勘探具有探测深度大、抗干扰能力强等优点,是确保隧道施工安全的重要超前地质预报手段.反射地震波走时计算与地震数据处理中的纵横波分离、速度建模、偏移成像等多个步骤息息相关,直接影响着隧道地质预报的结果.本文将仿照反射波法隧道超前地质预报的实际施工区域进行速度建模,以求解程函方程为基础,结合快速推进法(FMM)中的迎风有限差分方法以及窄带扩展技术实现针对隧道模型的初至地震波走时模拟.并通过对隧道模型中反射界面位置信息的提取,构建反射波初始窄带以及结合窄带扩展技术实现针对隧道模型反射波走时的计算.通过数值分析以及复杂隧道模型计算表明,文中给出的反射波法隧道超前地质预报地震波走时模拟具有良好的计算精度以及较强的适应能力.
STUDY ON SIMULATION OF SEISMIC WAVE TRAVEL TIME IN TUNNEL ADVANCED GEOLOGICAL PREDICTION USING REFLECTION WAVE METHOD
Tunnel construction safety often faces enormous challenges due to complex geological conditions.Reflec-tion wave seismic exploration has the advantages of a large detection depth and strong anti-interference ability,mak-ing it an important advanced geological prediction method to ensure tunnel construction safety.The calculation of re-flected seismic wave travel time is closely related to multiple steps in seismic data processing,such as the separa-tion of longitudinal and transverse waves,velocity modeling,and migration imaging,which directly affect the re-sults of tunnel geological prediction.This article will simulate the actual construction area of advanced geological prediction for tunnels using the reflected wave method for velocity modeling.Based on solving the functional equa-tion,combined with the upwind finite difference method and narrowband expansion technology in the Fast Moving Method(FMM),the first break seismic wave travel time simulation for the tunnel model will be achieved.By extrac-ting the location information of the reflection interface in the tunnel model,an initial narrow band of the reflection wave is constructed,and,combined with narrowband expansion technology,the calculation of the travel time of the reflection wave in the tunnel model is achieved.Through numerical analysis and complex tunnel model calculations,it is shown that the reflected wave method proposed in the article has good computational accuracy and strong adapt-ability in predicting seismic wave travel time in the advanced geological prediction of tunnels.

Reflected seismic waveSeismic traveltime calculationTunnel geological forecastFirst-arrival trav-eltime calculationFast marching method

徐若格、孙辉、陈瑞、任洪涌、张健、李猛、高福柳、赵晓彦

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西南交通大学地球科学与工程学院,成都 611756,中国

地震反射波 地震波走时计算 隧道超前地质预报 初至走时计算 快速推进法

国家自然科学基金项目四川省自然科学基金项目国家重点研发计划中央高校基本科研业务费

423741662023NSFSC07702022YFF080260042374166

2024

10.13544/j.cnki.jeg.2023-0465

工程地质学报
中国科学院地质与地球物理研究所

工程地质学报

CSTPCD北大核心
影响因子：1.215
ISSN：1004-9665
年,卷(期)：2024.32(2)
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