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Top plate weaken danger removing method

A roof and directional drilling technology, which is applied in drilling equipment and methods, earthwork drilling, drilling equipment, etc., can solve the problems that the hard roof cannot be fundamentally treated, and the danger of large-area suspended roof impact mine pressure cannot be eliminated. Achieve the effect of simplifying the roadway support method, reducing the amount of repair work, and reducing maintenance costs

Inactive Publication Date: 2019-08-16
CHINA SHENHUA ENERGY CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inventor found in the process of realizing the present invention that the existing passive payment method cannot fundamentally control the hard roof, and cannot relieve the risk of rock burst caused by large-area suspended roof

Method used

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Embodiment Construction

[0026] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. Wherein the same components are denoted by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the words "inner" and "outer ” refer to directions towards or away from the geometric center of a particular part, respectively.

[0027] figure 1 It shows the flow chart of the method for roof weakening and danger relief according to the embodiment of the present invention, as figure 1 As shown, the roof weakening method provided by the embodiment of the present invention is mainly applicable to the advanced weakening of a hard roof, and the method includes:

[0028] S100, determining the key layer of the overlying rock mass;

[0029] There are certain key strata in the overlyin...

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Abstract

The embodiment of the invention discloses a top plate weaken danger removing method. The top plate weaken danger removing method comprises the steps that a critical layer of an overlying rock mass isdetermined; directional drilling holes are distributed in the critical layer; the directional drilling holes are constructed; and after constriction of the directional drilling holes are completed, staged fracturing is conducted on fracturing equipment by sending the fracturing equipment to the directional drilling holes. The directional drilling holes are accurately controlled in a hard top platerock layer by using the top plate weaken danger removing method, the rock intensity of the hard top plate can further be effectively reduced, the whole continuity of rock is destroyed, the top plateis effectively weakened, the top plate hanging arch area is eliminated or reduced, and the high mine pressure risk of working surface recovery is relieved in advance; and meanwhile, the pressure of anearby roadway rock layer can be lowered through effective collapsing of the whole working surface hard top plate, the supporting mode of a roadway is simplified, the repair work amount of the roadwayis reduced to great degree, and thus the maintenance cost of the roadway is lowered.

Description

technical field [0001] The invention relates to the technical field of coal mines, in particular to a roof weakening method for relieving danger. Background technique [0002] my country is one of the countries with the richest coal resources in the world. However, in the geological history, my country has experienced multiple periods of tectonic movements, and the phenomenon of composite superposition of basins is obvious, resulting in complex conditions for the overall occurrence of coal seams. According to statistics, nearly 1 / 3 of coal seams in my country are hard roofs, and they are widely distributed. The overlying hard roof is mainly a coal seam roof with stable thickness, high strength, good integrity, and difficult to collapse. Its stable mechanical properties and support structure of the working face lead to a large area of ​​roof overhang. With the advancement of the working face gradually increasing, when the roof is difficult to support, the suspended roof sudd...

Claims

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Application Information

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IPC IPC(8): E21C41/18E21B7/04
CPCE21B7/046E21C41/18
Inventor 杨俊哲虎维岳罗文王振荣郑凯歌李延军张俭高亮陈殿赋康健庞乃勇高振宇杨茂林高小伟江球
Owner CHINA SHENHUA ENERGY CO LTD
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