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Omnibearing pressure relief method for thick coal seam working face rock burst danger roadway

A technology of ground pressure and working face, which is used in tunnels, earthwork drilling, mining equipment, etc., can solve the different degrees of pressure relief of the surrounding rock of the roadway, and cannot ensure the coordination and integrity of the pressure relief effect of the surrounding rock of the roadway, etc. To achieve the effect of maintaining stability and safety, ensuring coordination and integrity, and preventing coal protruding

Inactive Publication Date: 2020-09-01
临沂矿业集团菏泽煤电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most of the pressure relief in the roadway is only to relieve the pressure in the local stress concentration area, and the degree of pressure relief in the surrounding rock of the roadway is different, so the coordination and integrity of the pressure relief effect of the surrounding rock of the roadway cannot be guaranteed. To improve the pressure relief effect, it is necessary to make further improvements to the existing pressure relief methods

Method used

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  • Omnibearing pressure relief method for thick coal seam working face rock burst danger roadway
  • Omnibearing pressure relief method for thick coal seam working face rock burst danger roadway
  • Omnibearing pressure relief method for thick coal seam working face rock burst danger roadway

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Embodiment 1

[0034] Thick coal seams are prone to plastic slip under the action of superimposed stress, leading to an increase in the stress of the surrounding rock of the roadway, especially under the action of external disturbance stress, the risk of rock burst in the coal body increases. An all-round pressure relief method for dangerous rockburst roadways in thick coal seam working faces, which is applied to mining roadways in thick coal seam working faces, and can avoid the influence of external stress disturbance on roadways. The specific steps are:

[0035] A. When the roadway is excavated to the rock burst dangerous area, the pressure relief method and pressure relief parameters shall be determined according to the mining conditions and geological conditions.

[0036] The risk area of ​​rock burst is determined by using the comprehensive index method or the possibility index method, and according to the coal seam burst tendency, mining depth, roof and floor lithology, tectonic stress...

Embodiment 2

[0049]In this embodiment, taking a certain mine as an example, an all-round pressure relief method and its beneficial effects are described for a dangerous rockburst roadway in a thick coal seam working face.

[0050] A mine field is a Carboniferous and Permian coalfield of North China type, and the strata from top to bottom are Quaternary, Upper Tertiary, Upper Shihezi Formation of Upper Permian System, Lower Shihezi Formation and Shanxi Formation of Lower System, Carboniferous The Taiyuan Formation of the Upper System and the Benxi Formation of the Central System. The main coal seam of the mine is 3 coal seams with an average thickness of 3.78m. The coal seam thickness of the 3301 working face is 6.0m, and the air inlet and return roadway of the working face adopts a rectangular section with a net width of 4.4m and a net height of 3.8m, and the top coal construction is carried out. The top plate adopts Φ22×2400 (mm) left-handed threaded steel anchor rod without longitudinal...

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Abstract

The invention provides an omnibearing pressure relief method for a thick coal seam working face rock burst danger roadway and relates to the technical field of rock burst danger prevention and control. The method is mainly applied to a thick coal seam working face and specifically comprises the steps that when the roadway is tunneled to a rock burst danger area, the pressure relief manner and pressure relief parameters are determined according to mining conditions and geological conditions; cut joints are constructed on a top plate for pressure relief, drilled holes are constructed on a bottomplate for water injection softening, large-diameter drilled holes are constructed on two walls of the roadway for pressure relief, and a barrel-shaped pressure relief zone is formed; and the stress state of surrounding rock of the roadway is determined, and it is guaranteed that a peak stress area is located outside a supporting range. According to the pressure relief method, the barrel-shaped weakening zone can be formed within a certain range of the surrounding rock of the roadway, so that high stress in the surrounding rock of the roadway is transferred to the deep portion, and then it isguaranteed that the surrounding rock of the roadway is located at low stress; and when impacts happen, the barrel-shaped area can bear overall stress, coal is prevented from protruding, a wedge-shapedresistance zone is generated, and therefore rock burst danger is prevented from happening.

Description

technical field [0001] The invention relates to the technical field of rock burst hazard prevention and control, in particular to an all-round pressure relief method for rock burst dangerous roadways in thick coal seam working faces. Background technique [0002] Rock burst is a typical dynamic disaster faced by deep mining of coal mines. It is characterized by the sudden and violent release of elastic energy accumulated in the coal rock mass, and the power throws the coal rock to the roadway or stope, causing strong vibration and damage to the coal rock mass and equipment. damage and casualties. With the development and extension of mines, mine rock burst disasters are becoming more and more serious. Judging from the current rock burst accidents, most of the rock burst accidents occurred during the roadway excavation or along the two sides of the coal mining face. There are less cases of rock burst. [0003] During the excavation of roadway, methods such as drilling and b...

Claims

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Application Information

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IPC IPC(8): E21D9/00
CPCE21D9/001
Inventor 李存禄吴继鲁赵艳鹏薛浩杰申世豹马洼
Owner 临沂矿业集团菏泽煤电有限公司
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