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Method for controlling influence range of mining by directional hydraulic fracturing in underground roadway

A technology of hydraulic fracturing and mining impact, applied in underground mining, surface mining, mining fluids, etc., can solve problems such as inability to actively protect buildings and control the impact range of surface mining.

Inactive Publication Date: 2018-08-03
HENAN POLYTECHNIC UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

This method can only estimate and demarcate the scope of impact of mining, but cannot actively control the scope of influence of surface mining, and cannot actively protect buildings in subsidence areas on the surface

Method used

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  • Method for controlling influence range of mining by directional hydraulic fracturing in underground roadway
  • Method for controlling influence range of mining by directional hydraulic fracturing in underground roadway
  • Method for controlling influence range of mining by directional hydraulic fracturing in underground roadway

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Embodiment Construction

[0022] It is planned to select Lane 53041 of a certain mine as the test area. Such as Figure 1~4 As shown, by obtaining the stratum level, thickness, strength and ground stress of the overlying strata, the point that sinks 10mm is taken as the boundary point A of the surface mobile basin, and the boundary angle of the surface mobile basin is determined 0 . Further, according to whether the structures are brick-wood or brick-concrete village houses, the protection level of the buildings in the mining area is divided into Level, the width of the enclosure belt is 10m, the horizontal movement distance S of the basin boundary of the surface movement is obtained, and the pre-crack height H of the overlying strata is finally determined.

[0023] The fracturing drilling is arranged in a single row, such as Figure 1~4 As shown, the drill hole spacing is calculated according to the wetting radius R of the water injection hole, and is determined to be 10m in order to form throug...

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Abstract

The invention relates to a method for controlling the influence range of mining by directional hydraulic fracturing in an underground roadway. The method comprises the following steps that (1) the geological and mining conditions of a working face and the geological conditions of overlying strata of a pre-splitting roadway are obtained, and the boundaries of a surface movement basin are analyzed;(2) according to the grade of surface construction needed to be protected, the width of an enclosing belt is determined and the boundaries of the surface movement basin are controlled; (3) according to the step (2), the boundaries of the surface movement basin are controlled and the pre-splitting heights and locations of the overlying strata are determined; and (4) hydraulic fracturing is carriedout on roofs of the overlying strata according to the pre-splitting heights and positions of the overlying strata determined in the step (3). According to the method for controlling the influence range of mining by the hydraulic fracturing in the underground roadway, the influence range of mining can be reduced, so that the mining damage to the surface construction is eliminated, and the purpose of protecting the surface construction is achieved.

Description

technical field [0001] The invention specifically relates to a method for controlling the influence range of mining from directional hydraulic fracturing of underground roadways, and belongs to the field of mining technical methods. Background technique [0002] Coal is the main energy in today's society. With the development of society and the progress of production technology, people's demand for energy is increasing. After the coal is extracted from the ground, the overlying rock layer above it loses its support, and the original stress balance state inside the rock mass is destroyed, which causes the redistribution of stress in the rock mass, causing displacement, deformation and even destruction of the rock mass around the goaf. When the goaf area reaches a certain range, the surface above the goaf will move and deform. The movement and deformation of the ground surface affect the foundation of the structure, resulting in movement and deformation of the structure, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21C41/18
CPCE21B43/26E21C41/18
Inventor 冯占杰郭文兵谭毅杨达明徐飞亚
Owner HENAN POLYTECHNIC UNIV
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