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Detection and analysis method of surrounding rock structure evolution process in deep coal mine roadway area

An analysis method and technology of surrounding rock, applied in the direction of using sonic/ultrasonic/infrasonic waves to analyze solids, etc., can solve the problems of 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: 2017-03-22
INST OF ROCK & 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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  • Detection and analysis method of surrounding rock structure evolution process in deep coal mine roadway area
  • Detection and analysis method of surrounding rock structure evolution process in deep coal mine roadway area
  • Detection and analysis method of surrounding rock structure evolution process in deep coal mine roadway area

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Embodiment 1

[0032] The present invention will be further described in detail below in conjunction with the 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 of the deep tunnel area of ​​the coal mine, its steps are:

[0034] A. According to engineering requirements, select the area to be tested around the excavated roadway 1-1, the depth of the area is 3~7 times the tunnel diameter, this area can be the first area surrounding rock 2-1 and the second area located on the two sides of the roadway 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 unexcavated roadway, such as the unexcavated roadway 1-2, the second area surrounding rock 2-2 can be selected as the test area around the excavated roadway 1-1.

[0035] Layout test boreholes at the bound...

Embodiment 2

[0041] In this example, the surrounding rock structure of a deep roadway in a coal mine with a buried depth of -850m was detected. The test area and drilling layout are as follows Image 6 As shown, the diameter of the test 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 area size is 2×1×25m (width×height×depth), and the lower edge of the area is 0.5m above the floor. Due to the small detection area, five holes are arranged at the boundary and center of the area, namely the first hole 3-1, the second hole 3-2, the third hole 3-3, and the fourth hole. 3-4. The fifth drill hole 3-5, the hole diameter is 130mm, the downward slope is 2°, and the hole depth is 25m. Install and push the digital drilling camera probe 4 in the first hole 3-1, the second hole 3-2, the third hole 3-3, the fourth hole 3-4, and the fifth hole 3-5 in sequence To collect bore...

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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 invention belongs to the technical field of rock mass structure detection and analysis, and specifically relates to a detection and analysis method suitable for the evolution process of the surrounding rock structure in the deep mine roadway area. Background technique [0002] Affected by the geological environment and human excavation activities, there are a large number of structural surfaces in the surrounding rock of deep coal mine roadways. These structural planes are often parts with relatively weak mechanical strength of the surrounding rock, which lead to discontinuities, heterogeneity and anisotropy of the mechanical properties of the surrounding rock, and their spatial distribution and combination have a great influence on the medium characteristics and mechanical properties of the surrounding rock. Important impact. Therefore, detecting and analyzing the surrounding rock structure and mastering its evolution process is of great significance ...

Claims

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Application Information

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Patent Type & Authority Patents(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 & SOIL MECHANICS CHINESE ACAD OF SCI