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A design method for key parameters of strip goaf control filling

A technology of key parameters and design methods, which is applied to filling materials, mining equipment, earthwork drilling and mining, etc., can solve the problems of large filling grouting volume, and does not consider the bearing performance of the remaining coal pillars, so as to reduce the filling cost and improve the filling effect , to ensure long-term stable effect

Active Publication Date: 2022-03-15
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a method for designing key parameters of strip-type goaf control filling to solve the problem of the lack of consideration of the bearing performance of the remaining coal pillars in the filling of coal mines after mining in the prior art. The technical problem of excessive filling and grouting

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  • A design method for key parameters of strip goaf control filling
  • A design method for key parameters of strip goaf control filling
  • A design method for key parameters of strip goaf control filling

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Embodiment 1

[0059] In this embodiment, what needs to be filled and treated is a strip-type goaf in Jining, Shandong. The specific parameters of the goaf include: mining depth H is 500m, overlying rock bulk density gamma 24kN / m 3 , the width of the remaining coal pillar a 50m, the remaining coal pillar spacing b 50m, the remaining coal pillar height h is 3m, the uniaxial compressive strength of coal σ s is 10MPa, the internal friction angle of coal φ s is 30°, the lateral pressure coefficient of the elastic-plastic contact surface of the legacy coal pillar lambda s is 0.43, the coefficient of broken expansion of coal k is 1.2, the angle of repose of the stacked body φ r is 40°, the elastic modulus of coal E s 1.5GPa, filling width c c2 50m.

[0060] Due to the large width of strip mining, the strip coal pillar left in the strip goaf includes plastic zone and elastic core zone. The stripping of the legacy coal pillar will reduce the effective size of the coal pillar and i...

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Abstract

The invention provides a method for designing key parameters of strip-type goaf control filling. The method comprises the following steps: Step 1. Sampling the coal and rock mass left over in the strip-type goaf, and testing to obtain coal rock mass The physical and mechanical parameters of the body, the physical parameters include the disintegration coefficient of coal and the angle of repose of the accumulation body; step 2, determine the maximum stripping depth of the remaining coal pillar according to the physical and mechanical parameters of the measured coal rock mass; step 3, according to the remaining The maximum peeling depth of the coal pillar determines the safety factor of the remaining coal pillar; step 4, determines whether the goaf needs to be filled and treated according to the safety factor of the left coal pillar, and determines the filling treatment method and control filling parameters; the method of the present invention makes full use of the goaf The bearing performance of the remaining coal pillars in the area improves the filling effect of the strip goaf and reduces the filling cost of the strip goaf.

Description

technical field [0001] The invention belongs to the field of coal mine subsidence prevention and control, and relates to goaf control filling parameters, in particular to a design method for key parameters of strip type goaf control filling. Background technique [0002] In order to effectively control the surface subsidence after coal mining, strip mining, as one of the effective means of coal mining for buildings and structures, is widely used in my country, and has been carried out in more than 10 provinces and more than 100 strip working faces. Strip mining, and mining over the years has formed a large number of strip goafs. [0003] At present, for strip goafs, the common method of goaf management is still used, the slurry full-fill grouting method. The slurry full-fill grouting method has the advantages of simple construction, fundamental treatment, and wide application range. However, the remaining voids in the strip-type goaf are large, and the amount of full fillin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/13E21F15/00G06F119/14
CPCG06F30/13E21F15/00G06F2119/14
Inventor 许刚刚王晓东杨建朱世彬武博强冯龙飞李渊王海
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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