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A method and system for calculating the velocity of seismic direct waves

A calculation method and direct wave technology, applied in seismology, seismic signal processing, complex mathematical operations, etc., can solve the problems of slow calculation speed, inaccurate effect, slow efficiency of seismic direct wave velocity, etc., and achieve the goal of reducing surrounding noise Influence, eliminate the interference of surrounding noise, and the effect of accurate direct wave velocity

Active Publication Date: 2022-06-17
SHANDONG UNIV +1
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the data processing process of the traditional seismic wave reflection wave method for advanced geological prediction of tunnels, the efficiency of calculating the velocity of the direct seismic wave is very slow, and most of them are based on the manual selection of the amplitude peak points of all gathers based on expert experience and linear fitting
The inventor found that when calculating the distance between the geophone and the source point, a simple straight-line distance between two points is used, the effect is inaccurate and the calculation speed is slow

Method used

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  • A method and system for calculating the velocity of seismic direct waves
  • A method and system for calculating the velocity of seismic direct waves
  • A method and system for calculating the velocity of seismic direct waves

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Embodiment 1

[0039] refer to Figure 10 , a method for calculating the wave velocity of a direct seismic wave in the present embodiment, comprising:

[0040] Step 1: Receive and preprocess the seismic wave data of all channels. The seismic wave data includes the distance between the source point and the receiver point of the geophone around the tunnel surface and the sampling time of the geophone.

[0041] Seismic reflection wave method is a method of artificial seismic exploration using seismic reflection waves, and it is a commonly used engineering geophysical prospecting method for tunnel advance geological prediction. When hammering or other seismic wave source excitation is performed in the tunnel, the seismic wave propagates in the form of spherical waves in the rock. When the seismic wave encounters the interface of wave impedance difference, such as fault, rock mass fracture zone, lithology change or karst development zone, etc. , part of the seismic wave signal is reflected back,...

Embodiment 2

[0102] This embodiment provides a seismic direct wave velocity calculation system, including:

[0103] (1) A receiving and preprocessing module, which is used to receive and preprocess the seismic wave data of all channels. The seismic wave data includes the distance between the source point and the receiving point of the geophone around the curved surface of the tunnel and the sampling time of the geophone;

[0104] (2) an initial fitting module, which is used to find the distance and time corresponding to the maximum amplitude peak value of each waveform after preprocessing, form corresponding fitting points, eliminate outlier amplitude values, and perform initial straight line fitting;

[0105] (3) Re-fitting module, which is used to obtain the upper and lower time limits of each waveform based on the upper and lower limits of the wave velocity of the rock mass and the initial straight line, and then find out the maximum amplitude within the upper and lower time limits and i...

Embodiment 3

[0109] This embodiment provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, implements the steps in the method for calculating the velocity of a direct seismic wave as described above.

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Abstract

The invention belongs to the field of seismic direct wave velocity calculation, and provides a seismic direct wave velocity calculation method and system. Among them, the calculation method of the seismic direct wave velocity includes: receiving and preprocessing the seismic wave data of all channels, the seismic wave data includes the distance between the source point and the receiving point of the geophone around the tunnel surface and the sampling time of the geophone; The distance and time corresponding to the maximum amplitude peak form the corresponding fitting points, remove outlier amplitude values, and perform initial straight line fitting; based on the upper and lower limits of the wave velocity of the rock mass and the initial straight line, obtain the upper and lower limits of the time of each waveform, and then find out The maximum amplitude within the upper and lower limits of time and its corresponding distance and time are fitted to a straight line again; the reciprocal of the slope of the fitted straight line is obtained to directly obtain the velocity of the direct seismic wave.

Description

technical field [0001] The invention belongs to the field of direct seismic wave velocity calculation, and in particular relates to a method and system for calculating the wave velocity of direct seismic waves. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] In the data processing process of the traditional seismic wave reflection wave method for advanced geological prediction of tunnels, the efficiency of obtaining the direct seismic wave velocity is very slow. Most of the peak amplitude points of all gathers are manually selected based on expert experience, and a straight line is fitted. . The inventors found that the simple straight-line distance between the two points is used to obtain the distance between the detector and the epicenter, which is inaccurate and slow in calculation speed. SUMMARY OF THE INVENTION [0004] In order t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30G06F17/11
CPCG01V1/303G06F17/11
Inventor 陈磊陈安太左志武孙法合张灵莉李铎李凯王凯许新骥
Owner SHANDONG UNIV