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
CN106522950AInactive Publication Date: 2017-03-22SHANDONG UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
SHANDONG UNIV OF SCI & TECH
Publication Date
2017-03-22
Estimated Expiration
Not applicable Β· inactive patent

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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.
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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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