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Method for detecting and analyzing evolution process of structure of surrounding rock in area of deep tunnel of coal mine

An analysis method and technology of surrounding rock, applied in the direction of using sonic/ultrasonic/infrasonic waves to analyze solids, etc., can solve problems such as difficult to grasp the change process, difficult to reflect the regional characteristics of the surrounding rock structure, and difficult to cover the entire area of ​​the surrounding rock with test drilling, etc. To achieve the effect of improving accuracy and reliability, and improving efficiency

Active Publication Date: 2015-05-06
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, restricted by objective conditions, it is difficult for the test borehole to cover the entire area of ​​the surrounding rock, and the information obtained through a single borehole camera can only reflect the structural characteristics of the local surrounding rock, and it is difficult to reflect the regional characteristics of the surrounding rock structure
In addition, the surrounding rock structure after excavation of the roadway is actually changing dynamically, and it is difficult to grasp this change process only through the borehole camera method
Therefore, there is an urgent need for a new detection and analysis method to obtain the structural evolution process of the surrounding rock in the deep coal mine roadway area, but this method has not been reported in domestic and foreign literature

Method used

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  • Method for detecting and analyzing evolution process of structure of surrounding rock in area of deep tunnel of coal mine
  • Method for detecting and analyzing evolution process of structure of surrounding rock in area of deep tunnel of coal mine
  • Method for detecting and analyzing evolution process of structure of surrounding rock in area of deep tunnel of coal mine

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Embodiment 1

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0033] according to figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 It can be seen that a detection and analysis method suitable for the surrounding rock structure in the deep coal mine roadway area, the steps are:

[0034] A. According to the project requirements, select the area to be tested around the excavated roadway 1-1. The depth of the area is 3~7 times the hole diameter. This area can be the first area surrounding rock 2-1 and the second Area surrounding rock 2-2 and the third area surrounding rock 2-3 located on the floor of the roadway. For the advanced detection of the surrounding rock structure of the adjacent unexcavated roadway, such as the unexcavated roadway 1-2, the surrounding rock 2-2 in the second area can be selected as the test area around the excavated roadway 1-1.

[0035] Test boreholes are respectively arranged at the ...

Embodiment 2

[0041] This example detects the surrounding rock structure in the deep roadway area of ​​a coal mine with a buried depth of -850m. The test area and drilling arrangement are as follows: Figure 6 As shown in the test, the diameter of the excavated roadway 1-1 is 4.50×3.45m. The specific methods and steps are as follows:

[0042] A. Select the second area 2-2 of the excavated roadway 1-1 as the area to be tested. The size of the area is 2×1×25m (width×height×depth), and the lower edge of the area is located 0.5m above the floor. Since the selected detection area is small, five boreholes are arranged at the boundary and center of the area, namely the first borehole 3-1, the second borehole 3-2, the third borehole 3-3, and the fourth borehole 3-4. The fifth drilling hole 3-5 has a diameter of 130mm, a downward slope of 2°, and a depth of 25m. In the first borehole 3-1, the second borehole 3-2, the third borehole 3-3, the fourth borehole 3-4, and the fifth borehole 3-5, install...

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Abstract

The invention discloses a method for detecting and analyzing the evolution process of the structure of surrounding rock in the area of a deep tunnel of a coal mine. The method comprises the following steps: (1) distributing testing drill holes in a to-be-detected area of the surrounding rock of the deep tunnel of the coal mine, and installing and propelling digital drill hole picture taking probes in the drill holes in sequence to obtain the principle on evolution of the propagation characteristic of sound waves along with time in the drill holes of the surrounding rock, wherein the drill holes are arranged in parallel, and have the same depth as the to-be-detected area of the surrounding rock; (2) obtaining the spacial distribution of the volumetric joint count (Jv) of the surrounding rock in the area of the deep tunnel according to single hole structure surface information; (3) obtaining the spacial distribution of the integrity index (Kv) of the surrounding rock in the area of the deep tunnel and the evolution principle of the surrounding rock by taking the propagation of sound waves of adjacent drill holes in the area of the deep tunnel as a boundary condition; and (4) comparing the integrity index, the volumetric joint count (Jv), with the integrity index (Kv) of the surrounding rock comprehensively to obtain the evolution process of the structure of the surrounding rock in the area of the deep tunnel of the coal mine. The method disclosed by the invention is practical, is easy and convenient to operate and is used for obtaining the integrity and evolution principle of the structure of the surrounding rock before and after excavating the tunnel of the coal mine so as to provide scientific basis for the stable control and security evaluation of the surrounding rock of the deep tunnel of the coal mine.

Description

Technical field [0001] The present invention belongs to the field of exploration and analysis technology of rock body structure, which specifically involves a detection and analysis method that is suitable for the evolution of the evolution of rock structure evolution in the deep alley in the coal mine. Background technique [0002] Affected by the geological environment and human excavation activities, there are a large number of structural surfaces in the deep lane surrounding rocks of coal mines.These structures are often parts with relatively weak intensity of the surrounding rock mechanics. It leads to the discontinuousness, unevenness, and the opposite sex of the nature of surrounding rock mechanics. The spatial distribution and combination areThe important impact.Therefore, it is of great significance to detect and analyze the structure of surrounding rocks and master its evolution process. [0003] At present, the main means of surrounding rock structure detection are sti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/07
Inventor 朱元广刘泉声张程远刘滨康永水
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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