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Method for quantitative observation determination of impact coal body volume expansion

A method to determine the impact of the coal body, applied in the direction of measuring devices, instruments, etc., to achieve the effect of easy impact risk assessment and early warning

Inactive Publication Date: 2014-10-15
SHANDONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no precedent for this strain gauge to be used to monitor the expansion process of impact coal seam roadway

Method used

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  • Method for quantitative observation determination of impact coal body volume expansion
  • Method for quantitative observation determination of impact coal body volume expansion
  • Method for quantitative observation determination of impact coal body volume expansion

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Embodiment Construction

[0025] Such as Figure 1-3 As shown, a method for quantitative observation and determination of impact coal expansion capacity, the steps are as follows:

[0026] 1. In the coal seam roadway 1 that has already been excavated, three horizontal observation boreholes shall be constructed in the lateral surrounding rock of a section prone to rock burst as monitoring points, and the depth of the boreholes shall be greater than 8.0m; two of them shall be Two adjacent boreholes are used as the displacement test borehole 4 for installing the displacement observation device, and the remaining one borehole is used for installing the stress observation device 3 as the stress test borehole 2;

[0027] Two, the stress observation device 3 and two displacement observation devices are installed respectively in the above-mentioned stress test borehole 2 and in the displacement test borehole 4; The stressed direction of the stress observation device 3 is required to be as follows figure 2 In...

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Abstract

The invention discloses a method for quantitative observation determination of impact coal body volume expansion. The method comprises the steps of first drilling three horizontal observation drill holes in surrounding rock from a lateral wall of one cross section of a tunneled coal seam roadway of an area where rock burst occurs easily so as to serve as monitoring points, respectively installing a stress observation device and two displacement observation devices in the drill holes, obtaining vertical displacement of a monitoring point coal seam through continuous recording of a stress display instrument in the coal mining process; obtaining the front-rear displacement of the monitoring point coal seam through displacement display instruments; and obtaining volume expansion of the monitoring points by subtracting the vertical displacement of the coal seam from double front-rear displacement of the monitoring point coal seam; and when the volume expansion at some moment is larger than zero, showing that an existing volume is larger than an original volume and volume expansion occurs. According to the method, through continuous observation in the impact coal seam volume expansion process under the conditions of multiple structures, high stress and a large buried depth, the coal seam roadway volume expansion is obtained, and the quantitative basis is provided for roadway impact risk judgment.

Description

technical field [0001] The invention belongs to the technical field of coal mining. Background technique [0002] Rock burst is one of the most serious natural disasters in coal mines worldwide. The disaster is to release the deformation energy of coal and rock in a sudden, sharp and violent form. The coal and rock are thrown out, causing damage to the support, blockage of the roadway, and huge noise and vibration of the rock mass. Rockburst is the failure process of coal-rock mass structure induced during mining and accompanied by microseismic activity and sudden release of elastic energy. The sudden destruction of the impacted coal body is accompanied by the rapid expansion of the volume, which is the expansion. "Rock Mechanics and Engineering" Journal, 2002, Issue 52, Pan Liyou and others put forward the "Expansion Theory of Coal Seam Rockburst". This theory is based on the experiment and numerical simulation calculation of the impact media's fracture and instability p...

Claims

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Application Information

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IPC IPC(8): G01B21/00
Inventor 潘立友陈理强
Owner SHANDONG UNIV OF SCI & TECH
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