Method for monitoring rock burst risk of soft coal roadway posterior

A kind of shock ground pressure, dangerous technology, applied in the direction of surface mining, earthwork drilling, underground mining, etc., to achieve the effect of large contact area

Inactive Publication Date: 2017-03-22
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to propose a reliable rock burst risk monitoring method for roadways in soft coal seams in view of the current characteristics of rock burst in soft coal seams

Method used

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  • Method for monitoring rock burst risk of soft coal roadway posterior
  • Method for monitoring rock burst risk of soft coal roadway posterior

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Embodiment Construction

[0018] like figure 1 , figure 2 As shown, the steps of the method for monitoring the risk of rock burst in the back road of soft coal seam roadway of the present invention are as follows:

[0019] 1. Determine the dangerous area behind the roadway

[0020] In soft coal seam roadway excavation, for the roadway back road 1 where there is rock burst appearance area, the high stress area 2 of the roadway is divided by analogy, analysis and judgment of the characteristics of rock burst appearance in the adjacent stope.

[0021] 2. Drilling and installing monitoring anchor cables

[0022] Drill an anchor cable hole 3 every interval a=30-60m in the high-stress area 2 of the roadway, the depth of the hole is b=10m or more, and the distance from the bottom plate is 1.5-2.0m, and then install the anchor cable 4 in the anchor cable eye. When installing, the anchor cable 4 is outside The end should be put on the W-shaped steel strip 5 with a rigid side length greater than 40cm, then p...

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Abstract

The invention discloses a method for monitoring a rock burst risk of a soft coal roadway posterior. The method comprises the following steps of firstly dividing a high-stress zone of a roadway in a rock burst appearing zone of a roadway posterior during tunneling of a soft coal roadway; then punching anchor cable holes and installing anchor cables in the high-stress zone, wherein during installation, W-shaped steel straps of which the side length is greater than 40cm are firstly arranged on the outer ends of the anchor cables in a sleeving way, then dynamometers are sleeved, and then trays are additionally arranged and are fastened by nuts; observing and recording pressure change situations of the dynamometers in real time, wherein when the interior pressure increment of a coal bed changes suddenly, a sudden change zone is verified to have the rock burst risk. Because of large contact area between the adopted W-shaped steel straps and coal wall surface, the steel straps change obviously when the interior pressure increment of the coal bed changes suddenly, the dynamometers have sensibility, and the rock burst risk of the soft coal roadway posterior can be judged according to the characteristics of easiness in stress expansion and occurrence of sudden change of a soft coal bed.

Description

technical field [0001] The invention belongs to the technical field of coal mining. Background technique [0002] At present, in the field of mining, coal seams whose coal body hardness f is less than or equal to 1.0 are called soft coal seams. When tunneling in soft coal seams, the back road of the tunnel is always in a state of dynamic change. If there are structures, abnormal coal and rock layer structures, abnormal gas, etc. in front of the tunnel during tunneling, there is a risk of rock burst. Although the monitoring of rock burst has made great progress in theory and technology, for example, the current monitoring methods of rock burst hazard include drilling cuttings method, physical method, stress monitoring method, mine pressure method, coal seam water content change, surrounding rock Deformation etc. Due to the complexity, randomness, suddenness, and diversity of damage forms of rock burst, the risk monitoring of rock burst is sometimes not accurate enough. Thes...

Claims

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Application Information

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IPC IPC(8): E21C41/18E21D20/00E21D21/02E21F17/18
CPCE21C41/18E21D20/003E21D21/008E21D21/02E21F17/18
Inventor 潘立友
Owner SHANDONG UNIV OF SCI & TECH
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