Earthquake reflection data collection method with concentric-circle equivalent shot-geophone distance

A technology of data acquisition and seismic reflection, applied in seismic data acquisition, seismology for well logging records, seismology, etc., can solve the problems of hammer energy imbalance, affecting acquisition efficiency, consistency, etc., and achieve detection coverage Wide range and high collection efficiency

Active Publication Date: 2016-06-15
CHANGJIANG GEOPHYSICAL EXPLORATION & TESTING WUHAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the vertical survey line is affected by the climbing operation, which affects the collection efficiency even more
[0005] 2. Unbalanced hammering energy
It is impossible for different measurement points to have exactly the same energy every time they are hammered, so when processing data, the signal amplitudes between channels vary greatly
[0006] 3. Only two-dimensional information can be obtained, and the horizontal or vertical survey line can only obtain the profile information in front of the survey line

Method used

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  • Earthquake reflection data collection method with concentric-circle equivalent shot-geophone distance
  • Earthquake reflection data collection method with concentric-circle equivalent shot-geophone distance
  • Earthquake reflection data collection method with concentric-circle equivalent shot-geophone distance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] For example, the traffic tunnel project of a hydropower station in Yunnan uses the vertical reflection method of the concentric circle offset observation system for detection, and the tunnel radius is about 9 meters. Let the lower left corner of the pit face be point (0,0), take the coordinate point (4.4,3.5) as the excitation point, use the electric spark source, the drilling depth of the electric spark source is 1m, and the hole axis is perpendicular to the pit face wall and downward Tilt 10 degrees. Drilling location see attached figure 1 in the center of the circle. The radius of concentric circle measuring line 1 is 0.5m, the radius of concentric circle measuring line 2 is 1m, and the radius of concentric circle measuring line 3 is 1.5m. Draw 8 rays through the center of the circle in the face of the palm, and the angle between adjacent rays is 45 degrees. The 8 rays and the 3 concentric circles form 24 intersection points, and the detectors are respectively arra...

Embodiment 2

[0035] For example, the abutment groove project on the right bank of a hydropower station in Yunnan uses the vertical reflection method of the concentric circle offset observation system for detection, and the radius of the tunnel face is about 11 meters. Let the lower left corner of the face be the point (0,0), take the coordinate point (5.3,3.6) as the excitation point, and use the hammering source. The radius of concentric circle measuring line 1 is 0.6m, the radius of concentric circle measuring line 2 is 1.2m, and the radius of concentric circle measuring line 3 is 1.8m. Draw 8 rays through the center of the circle in the face of the palm, and the angle between adjacent rays is 45 degrees. The 8 rays and the 3 concentric circles form 24 intersection points, and the detectors are respectively arranged on the 24 intersection points. The geophone adopts a triangular iron base, which is fully coupled with the face of the tunnel through instant gypsum. The layout is as attache...

Embodiment 3

[0037] For example, the underground powerhouse project of a hydropower station in Yunnan uses the vertical reflection method of the concentric circle offset observation system for detection, and the tunnel radius is about 11 meters. Let the lower left corner of the pit face be point (0,0), take the coordinate point (6.4,5.3) as the excitation point, use the electric spark source, the drilling depth of the electric spark source is 1m, and the hole axis is perpendicular to the pit face wall and downward Tilt 10 degrees. The radius of the concentric circle measuring line 1 is 1.5m, the radius of the concentric circle measuring line 2 is 3m, and the radius of the concentric circle measuring line 3 is 4.5m. Draw 8 rays through the center of the circle in the face of the palm, and the angle between adjacent rays is 45 degrees. The 8 rays and the 3 concentric circles form 24 intersection points, and the detectors are respectively arranged on the 24 intersection points. The geophone ...

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Abstract

The invention relates to an earthquake reflection data collection method with the concentric-circle equivalent shot-geophone distance, and belongs to the technical field of engineering geophysical exploration. Geophones are arranged in concentric circles, a rock close point of a tunnel face is selected as an epicenter point, three concentric-circle measuring lines are arranged by taking the epicenter point as the circular center, seismic waves are excited at the circular center, and the geophones obtain reflection wave information in front of a tunnel. a 3D model diagraph is generated based on the spatial positions of the geophones at the tunnel face, a 3D geological construction surface can be observed clearly, and information of a geological structure in front or a defect geological body can be obtained via corresponding analyzing and processing methods.

Description

technical field [0001] The invention relates to a seismic reflection data acquisition method using concentric circles and other offsets, which belongs to the technical field of engineering geophysical exploration and is used for the geophysical prospecting method of the tunnel data acquisition method—vertical reflection method. The center of the circle excites seismic waves, the reflected wave information in front of the tunnel face is obtained through the geophone, and the information of the geological structure or unfavorable geological bodies ahead is obtained through corresponding analysis and processing methods. Background technique [0002] This method is actually a kind of vertical reflection method for tunnel geological advance prediction. The method works with a minimum offset (the distance between the excitation and the receiver tends to zero), and it can also be called the minimum offset reflection method. The biggest advantage of this method is that the waveform ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
CPCG01V1/288G01V1/42G01V1/003G01V1/20G01V2210/16
Inventor 张建清李鹏马圣敏丁亮清刘方文陆二男程建设
Owner CHANGJIANG GEOPHYSICAL EXPLORATION & TESTING WUHAN CO LTD
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