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《工程(英文)》 >> 2022年 第18卷 第11期 doi: 10.1016/j.eng.2021.06.018

基于频率域全波形反演的隧道超前探测研究

a Hubei Subsurface Multiscale Imaging Key Laboratory (SMIL), Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China
b Hubei Key Laboratory of Marine Geological Resources, China University of Geosciences, Wuhan 430074, China

收稿日期: 2020-04-27 修回日期: 2020-07-05 录用日期: 2021-06-26 发布日期: 2021-08-17

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摘要

地震超前探测方法是获取隧道前方复杂地质体结构的重要手段,对隧道工程的安全建设和灾害防治极为重要。针对目前隧道地震超前探测方法在获取掌子面前方地质体结构和物性参数时存在精度不足的问题,本文将高分辨率成像的声波频率域全波形反演方法应用于地震隧道超前探测,并研究了频率组选择策略以及观测系统对反演效果的影响,实现了隧道前方不良地质体的结构成像与物性反演。研究结果显示:本文基于常规频率域声波全波形反演的频率组选择策略,提出的覆盖垂直波数和抗混叠相结合的频率组选择策略,能够有效获得隧道前方地质体的空间结构和物性参数,并提高反演分辨率;本文通过线性增加隧道观测系统侧边长度,讨论不同隧道双边观测系统长度对反演成像的影响,得出侧边长度近似于掌子面宽度5 倍时反演效果最佳,超过该范围后继续增加侧边观测长度对反演结果影响可忽略;最后采用研究结果对复杂的多地层模型进行反演,得出掌子面前方复杂地层的准确结构形态和物性参数,验证了本文方法的可行性。

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