Method for reducing mining vibration energy under hard rock stratum

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...

AI Technical Summary

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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