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Method for carrying out shallow exploration by using SH wave excited by axisymmetric probe on ground

An axisymmetric, ground-based technology, used in seismology, geophysical measurement, seismic signal processing, etc., can solve the problems of low spatial resolution, limited improvement, complex measurement waveforms, etc., and achieve high spatial resolution and waveform shape. Simple, simple dispersion curve effects

Pending Publication Date: 2022-03-01
BEIJING HUAHUI GEOXPLORA TECH CO LTD
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Problems solved by technology

Because various waves are coupled together, the measurement waveform is complicated, useful information extraction is difficult, and the spatial resolution of exploration is not high, which limits further improvement.

Method used

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  • Method for carrying out shallow exploration by using SH wave excited by axisymmetric probe on ground
  • Method for carrying out shallow exploration by using SH wave excited by axisymmetric probe on ground
  • Method for carrying out shallow exploration by using SH wave excited by axisymmetric probe on ground

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] The present invention utilizes the SH wave excited on the ground by the axisymmetric probe to carry out the shallow exploration method, comprising the following process:

[0031] 1) The axisymmetric transmitting probe is stuck on the ground to excite the vibration in the circumferential direction, and all the excitation sources are simultaneously excited to obtain the axisymmetric vibration along the circumferential direction, which propagates in the formation in the form of SH wave. Wherein, the emission probe includes a circular tube 1 and excitation sources 2, and the excitation sources 2 are evenly distributed in the circumferential direction of the bottom of the circular tube 1.

[0032] There are two conditions for exciting SH waves on the ground, one is the vibration in the circumferential direction, and the other must meet the axisymmetric requirements. ...

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Abstract

The invention discloses a method for shallow exploration by using an SH wave excited by an axisymmetric probe on the ground. The method comprises the following steps: pricking an axisymmetric transmitting probe on the ground, exciting vibration in the circumferential direction, and spreading the vibration in an SH wave mode; array receiving probes are placed in the radial direction of the transmitting probe, SH wave waveforms at different source distances are measured, and vibration in the circumferential direction is received; processing the SH wave waveform to obtain a wave number-frequency distribution curve and a time difference frequency dispersion curve; converting the wave number-frequency distribution curve into a reciprocal of the wave number to obtain a depth-time difference relation curve; extending the high-order mode wave distribution curve to a frequency axis with a wave number of 0 on a wave number-frequency plane to obtain a corresponding frequency and a stratum depth; according to an actual time difference frequency dispersion curve assumption model, a time difference frequency dispersion curve is calculated and compared with an actually measured time difference frequency dispersion curve, the model is modified, parameters of the model are recalculated, and after the model is consistent with the actually measured time difference frequency dispersion curve, the model is an actually measured stratum model. According to the invention, the exploration precision and the spatial resolution are improved.

Description

technical field [0001] The invention belongs to the technical field of special instruments for stratum physical parameter measurement and lithology evaluation in various ground engineering constructions, and more specifically relates to a shallow exploration method using SH waves excited by an axisymmetric probe on the ground. Background technique [0002] In the process of ground exploration and underground space development, the shear wave velocity parameter of the formation is very important. It can be used to evaluate the lithology of the formation, detect the underground mined-out area, and design the construction plan. At present, there are two methods of surface acoustic wave exploration: shallow profile and surface wave exploration. The shallow profile is mainly explored by the reflection wave method, and the surface wave is explored by the surface wave close to the shear wave velocity. The directions of the vibration displacements excited by them are all perpendicu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/303G01V1/305G01V1/306G01V2210/6222
Inventor 沈永进
Owner BEIJING HUAHUI GEOXPLORA TECH CO LTD
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