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Detection method of shallow interface between volcanic rock and granite

A detection method and interface technology, applied in measurement devices, geophysical measurements, instruments, etc., can solve problems such as difficult to achieve detection, and achieve good consistency.

Inactive Publication Date: 2014-10-01
BEIJING RES INST OF URANIUM GEOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of ordinary surface wave exploration is more effective for relatively soft overburdens, but when the detection object is the interface between hard volcanic rock and granite, the traditional surface wave exploration method is also difficult to achieve the purpose of detection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The present invention comprises the following steps in turn:

[0018] Step 1. When the buried depth of the interface to be detected is less than 5 meters, the number of seismic acquisition channels is 6, the geophone frequency is 100 Hz, the offset distance is 2 meters, the channel spacing is 0.5 meters, the sampling rate is 0.125 milliseconds, and the recording length is 0.5 seconds. Hammering; along the survey line, conduct field measurements according to a fixed excitation distance of 2 meters; artificially excite seismic waves to extract longitudinal wave velocity and shear wave velocity;

[0019] Second step, obtain the first parameter, the first parameter is the difference between the square of the longitudinal wave velocity and the square of the shear wave velocity of 2 times; obtain the second parameter, and the second parameter is the square of the longitudinal wave velocity of 2 times and the shear wave velocity Poor; obtain the Poisson's ratio parameter, the ...

Embodiment 2

[0022] The present invention comprises the following steps in turn:

[0023] Step 1. When the buried depth of the interface to be detected is greater than or equal to 5 meters and less than 10 meters, the seismic acquisition channels are 12 channels, the geophone frequency is 40 Hz, the offset distance is 5 meters, the channel spacing is 1.0 meters, and the sampling rate is 0.25 milliseconds. The length is 1.0 seconds, and the end point is hammered; along the survey line, the field measurement is carried out according to the fixed excitation distance of 5 meters; the longitudinal wave velocity and the shear wave velocity are extracted by artificially exciting the seismic wave;

[0024] Second step, obtain the first parameter, the first parameter is the difference between the square of the longitudinal wave velocity and the square of the shear wave velocity of 2 times; obtain the second parameter, the second parameter is the square of the longitudinal wave velocity of 2 times an...

Embodiment 3

[0027] The present invention comprises the following steps in turn:

[0028] Step 1. When the buried depth of the interface to be detected is greater than or equal to 10 meters and less than or equal to 20 meters, the seismic acquisition channels are 24 channels, the geophone frequency is 10 Hz, the offset distance is 10 meters, the channel spacing is 2.0 meters, and the sampling rate is 0.5 milliseconds. The recording length is 2.0 seconds, and the end point is hammered; along the survey line, the field measurement is carried out according to a fixed excitation interval of 10 meters; the longitudinal wave velocity and the shear wave velocity are extracted by artificially exciting seismic waves;

[0029] Second step, obtain the first parameter, the first parameter is the difference between the square of the longitudinal wave velocity and the square of the shear wave velocity of 2 times; obtain the second parameter, the second parameter is the square of the longitudinal wave vel...

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Abstract

The invention relates to a detection method of the shallow interface between volcanic rock and granite. The method sequentially comprises the following steps that firstly, nearby the insidious interface between the volcanic rock and the granite, the velocity of longitudinal waves and the velocity of transverse waves are obtained through seismic waves generated due to excitation of an artificial seismic source; secondly, a first parameter, a second parameter and a Poisson ratio parameter are obtained, wherein the first parameter is a difference between the square of the velocity of the longitudinal waves and the square of the double velocity of the transverse waves, the second parameter is a difference between the square of the double velocity of the longitudinal waves and the square of the velocity of the transverse waves, and the Poisson ratio parameter is obtained by dividing the first parameter by the second parameter; thirdly, a Poisson ratio parameter low-value range from 0.10 to 0.23 is selected to represent the volcanic rock, and a Poisson ratio parameter high-value range from 0.24 to 0.31 is selected to represent the granite. According to the method, influences of a part of interference factors are reduce, the form of the interface between the volcanic rock and the granite is sketched, and a basis is provided for rock mass evaluation of high-level radioactive waste geological disposal.

Description

technical field [0001] The invention relates to a method for detecting the shallow interface of volcanic rock and granite, in particular to a method for detecting the shallow interface of volcanic rock and granite by using different value ranges of Poisson's ratio parameters to divide volcanic rock and granite body. Background technique [0002] In the site selection of geological repositories for high-level radioactive waste, granite bodies are often selected as rock masses for high-level radioactive waste repositories. As we all know, granite bodies are often associated with volcanic rocks, and detecting the trend and dip of the interface between volcanic rocks and granites on the surface is an important method to infer the scale of granite bodies. Due to the small difference in the physical properties (P-wave velocity, density, resistivity, magnetism, etc.) There's very little the interface can do. The use of ordinary surface wave exploration is more effective for relat...

Claims

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Application Information

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IPC IPC(8): G01V1/00
Inventor 徐贵来陈霜吴曲波潘自强万汉平
Owner BEIJING RES INST OF URANIUM GEOLOGY
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