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Construction method of integrated comprehensive treatment of strip mining goaf

A technology of comprehensive treatment and construction method, applied in ground mining, mining equipment, earth-moving drilling, etc., can solve problems such as affecting safety, and achieve the effects of convenient operation, enhanced strength, and reduced bearing load

Active Publication Date: 2020-06-02
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the remaining coal pillars also form a certain range of broken areas and plastic areas, which also affect the safety of new construction (structures) on the surface.

Method used

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  • Construction method of integrated comprehensive treatment of strip mining goaf
  • Construction method of integrated comprehensive treatment of strip mining goaf
  • Construction method of integrated comprehensive treatment of strip mining goaf

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: For all roof collapse type goafs, a large amount of collapsed rocks are accumulated in the goafs, such as figure 1 As shown, the specific construction method is as follows:

[0030] 1) Filling with gangue: Set up a number of boreholes 1 from the ground to the goaf, inject gangue through the borehole 1 for filling, mainly from the left and right sides, so that the gangue and the collapsed rock in the goaf fill the goaf ;

[0031] 2) Goaf grouting: After the gangue filling is completed, place a grouting pipe 11 with several grouting holes in the borehole 1, and carry out self-flowing grouting filling in the goaf so that the grout and the goaf The gangue and collapsed rock solidify to form gangue cement;

[0032] 3) Grouting for cracks in the overlying strata and separated layers: After the grouting in the goaf, set grout stoppers 12 at the bottom of several grouting pipes 11 to close the bottom, and inject high pressure grouting into the grouting pipes 11,...

Embodiment 2

[0034] Example 2: For the partially collapsed goaf of the roof, partially collapsed rocks are accumulated at the bottom of the goaf, such as figure 2 As shown, the specific construction method is as follows:

[0035] 1) Filling with gangue: Set up a number of boreholes 1 from the ground to the goaf, and inject gangue into the goaf through the borehole 1 for filling, so that the gangue and part of the collapsed rock in the goaf fill the goaf;

[0036] 2) Goaf grouting: After the gangue filling is completed, place a grouting pipe 11 with several grouting holes in the borehole 1, and carry out self-flowing grouting filling in the goaf so that the grout and the goaf The gangue and collapsed rock solidify to form gangue cement;

[0037] 3) Grouting for cracks in the overlying strata and separated layers: After the grouting in the goaf, set grout stoppers 12 at the bottom of several grouting pipes 11 to close the bottom, and inject high pressure grouting into the grouting pipes 11...

Embodiment 3

[0039] Example 3: For the roof non-caving type goaf, the roof is bent, there is no collapsed rock at the bottom of the goaf, and the cracks and abscission range of the overlying strata are small, such as image 3 As shown, the specific construction method is as follows:

[0040] 1) Filling with gangue: Set up a number of boreholes 1 from the ground to the goaf, and inject gangue into the goaf through the borehole 1 for filling, so that the gangue fills the goaf;

[0041] 2) Goaf grouting: After the gangue filling is completed, place a grouting pipe 11 with several grouting holes in the borehole 1, and carry out self-flowing grouting filling in the goaf so that the grout and the goaf The gangue and collapsed rock solidify to form gangue cement;

[0042] 3) Grouting for cracks in the overlying strata and separated layers: After the grouting in the goaf, set grout stoppers 12 at the bottom of several grouting pipes 11 to close the bottom, and inject high pressure grouting into t...

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Abstract

The invention discloses a construction method for integrated and comprehensive treatment of strip mining goafs, which relates to the field of coal mine goaf management. Firstly, the gobs are filled with gangue, and then grouted and filled. The solidified gangue cemented body has strong stability , so that the goaf after strip mining has the bearing capacity again, enhances the overall strength, and reduces the bearing load of the coal pillars on both sides; grouting the cracks and separation layers on the goaf, making the overlying It is solidified and cemented with the grout, so that the rock formations that originally had cracks are reconnected together, thereby preventing the overlying strata from continuing to collapse into the goaf; finally, the grouting treatment of the yield zone of the coal pillar further enhances the strength of the coal pillar and prevents the collapse of the coal pillar. The deformation of the coal pillar; the construction method is simple, the operation is convenient, the integrated comprehensive construction, the cost is low, the overall stability and bearing capacity of the goaf are ensured, the effect of settlement reduction is remarkable, and it is suitable for large-scale promotion and application.

Description

technical field [0001] The invention relates to the field of goaf control in coal mines, in particular to a construction method for integrated and comprehensive treatment of strip mining goafs. Background technique [0002] Strip mining is an effective mining method to control surface subsidence, and it is widely used in "three-down" coal mining in China. With the development of economy and society, many new constructions (structures) in my country's mining cities have to be built on goafs. The stability of goafs is an important factor affecting new constructions (structures) on the surface. At present, a lot of research has been carried out on the treatment of goafs in longwall mining, mainly using the grouting method, while the goafs in strip mining and longwall mining have significant differences, which can be divided into three types, the roof does not collapse Fall type, roof partly collapse type and roof collapse fully type. At the same time, the remaining coal pilla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F15/00E21C41/18
CPCE21C41/18E21F15/005
Inventor 尹大伟陈绍杰江宁李志远常西坤郭惟嘉陈兵马宏发刘兴全汪锋赵增辉
Owner SHANDONG UNIV OF SCI & TECH
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