近垂直反射正演模拟及其地下工程应用

doi:10.11720/wtyht.2020.1314

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Abstract

The approximate vertical reflection method is a seismic exploration technique with a minimum offset,which does not need a sufficiently large offset and is suitable for tunnel,roadway and other underground projects with narrow space.It can be used to locate and track medium and large geological structures such as faults and corrosion zones.Firstly,combined with the actual engineering situation,the tunnel and fault model are modeled,and the model parameters which are in accordance with the actual engineering are given.The forward simulation research is carried out,and the theoretical detection results of the fault are obtained.Then,approximate vertical reflection method detection is carried out three times in practical engineering by using forward simulation of seismic array parameters,and the results of forward simulation are compared and analyzed.Finally,the validity of approximate vertical reflection method in fault detection is proved by the actual excavation of tunnel.

Key words： approximate vertical reflection method forward simulation seismic exploration underground engineering fault detection

Received: 10 June 2019 Published: 24 June 2020

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	Articles by authors
	Lei XU
	Si-Yuan WANG
	Jian-Qing ZHANG
	Wen-Zhong LI
	Peng LI

Cite this article:

Lei XU,Si-Yuan WANG,Jian-Qing ZHANG, et al. Forward simulation of approximate vertical reflection method and its application to underground engineering[J]. Geophysical and Geochemical Exploration, 2020, 44(3): 635-642.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1314 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I3/635

The principle sketch of vertical reflection method

Wave impedance parameters of typical rock

The sketch of staggered grids

The sketch of perfectly matched layer

The sketch of 400 Hz ricker wavelet

Amplitude spectrum of 400 Hz ricker wavelet

Engineering geological map of 2# inclined shaft

Sketch of forward modeling

The result of the first forward simulation

The result of the second forward simulation

The results of the third forward simulation

Schematic layout of vertical reflection method

Field work photos

First detection result

Second detection result

Third detection result

Comprehensive analysis chart of the three survey results

Right side wall rock photos

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