Method for reducing mining vibration energy under hard rock stratum

A hard rock formation and energy technology, applied in the field of vibration energy control of coal mining under hard rock formations, can solve the problems of low recovery rate and efficiency, fracture, and failure to reduce stress concentration from the root cause, and achieve the effect of improving efficiency

Inactive Publication Date: 2017-04-26
HUABEI MINING GRP +1
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Problems solved by technology

However, since such rock formations are usually far away from the mining coal seam, and the spacing is mostly more than 100 meters, it cannot be broken by artificial methods, and technical measures to control the rock formation from breaking can only be adopted.
Most of the prevention and control measures currently adopted are based on the dynamic monitoring results during the mining process, and cannot reduce the stress concentration from the source; The overburden prevents it from breaking, and the recovery rate and efficiency are low

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  • Method for reducing mining vibration energy under hard rock stratum

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specific Embodiment approach

[0016] combine figure 1 , the specific embodiment of the present invention: a kind of method for reducing mining vibration energy under hard rock formation 1, comprises the following steps:

[0017] 1) Obtain the geological mining information of the mining area, and determine the maximum working face width allowed without breaking the hard rock layer 1 according to the mechanical parameters of the hard rock layer 1 and the distance between the hard rock layer 1 and the coal seam 6, and set aside 50-70m between the working faces Isolated coal pillar 5;

[0018] 2) Before mining at the coal mining face, several groups of drill holes 3 are constructed on the surface along the direction of the working face.

[0019] 3) During the mining process of the coal mining face, according to the distance between the coal mining face and each group of boreholes 3, each group of boreholes 3 is used to carry out grouting filling to the separation zone 7 under the hard rock layer 1, and the g...

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Abstract

The invention discloses a method for reducing mining vibration energy under a hard rock stratum. The method comprises 1) acquiring the geological exploitation information of a mining area, determining the maximum working face mining width under the condition of no breaking of a hard rock stratum and arranging 50-70m of partition coal pillars between work faces, 2) before mining on the mining face, along the working surface direction, drilling several holes on the ground surface, 3) in a mining process on the coal mining face, carrying out grouting filling on a separation area under the hard rock stratum orderly through the holes, forming several compressed support bands in a goaf through grouting filling pressure, wherein the width of each one of the support bands is 1/3 that of the coal mining face. Through grouting filling, a rock stratum having large thickness can be supported. The ground grouting filling does not disturb coal mining under the shaft. A normal long-wall work face can be arranged without a stripe so that a recovery rat and efficiency are significantly improved.

Description

technical field [0001] The invention relates to the field of mining, in particular to a method for controlling vibration energy of coal mining under a hard rock formation. Background technique [0002] Hard rock formations (especially thick hard rock formations) are a special form of rock formation above coal seams, which are distributed in many mining areas at home and abroad, such as Huafeng thick conglomerate, Jiaoping thick conglomerate, and Yima thick conglomerate , Jining extremely thick igneous rocks, Haizi extremely thick igneous rocks in the Huaibei mining area, etc. The extremely thick and hard rock formations mainly include sedimentary rock formations and igneous rocks (mostly bedrock type). The rock formations are relatively strong and complete, and are relatively far away from the mined coal seam, and most of them are beyond the range of the fracture zone caused by mining. It is generally believed that this rock layer does not have a great impact on the mine pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/18
CPCE21C41/18
Inventor 倪建明轩大洋董祥林许家林魏祥平王秉龙郭家标
Owner HUABEI MINING GRP
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