Filling mining critical-fullness-rate design method

A design method and filling rate technology, applied in design optimization/simulation, calculation, special data processing applications, etc., can solve problems such as filling cost and equipment investment increase

Pending Publication Date: 2018-04-20
CHINA UNIV OF MINING & TECH
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Problems solved by technology

Filling rate is the key to controlling rock strata movement and surface subsidence in filling coal mining technology. The gradual increase of filling rate makes the direct roof, basic roof, and key layers show caving-fracture

Method used

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  • Filling mining critical-fullness-rate design method
  • Filling mining critical-fullness-rate design method
  • Filling mining critical-fullness-rate design method

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Embodiment Construction

[0042] Below in conjunction with accompanying drawing and specific embodiment the technical solution of the present invention is described in further detail:

[0043] Since the filling body has different densities during compaction, different densities determine different elastic foundation coefficients (usually non-linear), which manifest as different anti-deformation capabilities under the action of the overlying strata, resulting in direct The movement degree of the overlying strata at different layers such as the top, basic top, and the key layer of the structure are respectively controlled at different stages with obvious characteristic differences. Defined as the critical filling rate. The obvious differences in motion state characteristics specifically include the failure of key structural layers, only bending subsidence of structural key layers, only bending subsidence of the basic roof, and only bending subsidence of the direct roof. It provides a reference for the d...

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Abstract

The invention discloses a filling mining critical-fullness-rate design method. The method includes: A, obtaining a theoretical design value of a solid-filling coal-mining fullness rate according to afilling mining objective and a control object; B, establishing an overlying stratum structure model and an elastic-foundation beam model; C, calculating a load of a n-th stratum on a first stratum according to a composite-beam principle; D, adopting a stiffness discriminating condition of stratum separation occurrence and a force differential principle of a beam to construct a deflection differential equation of the n-th stratum; E, simplifying fractured n-1 strata to a total elastic-foundation coefficient k, and establishing a relationship of the k and a filling-body elastic-foundation coefficient k<g> and a relationship of the k<g> and the fullness rate phi; F, solving a deflection curve equation expression by boundary conditions of a clamped-clamped beam; G, obtaining a relationship ofthe elastic-foundation coefficient k and stratum allowable-stress [sigma<t>] according to a first strength theory; and H, obtaining a critical fullness rate of fracturing occurrence of the n-th stratum by the elastic-foundation coefficient k.

Description

technical field [0001] The invention relates to a filling coal mining technology, in particular to a design method for a critical filling rate of filling mining. Background technique [0002] At present, the solid filling coal mining technology is the most effective technical way to liberate the "three under" coal pressing, and it is also a key technology to realize the green mining of coal mines. Filling rate is the key to controlling rock strata movement and surface subsidence in filling coal mining technology. The gradual increase of filling rate makes the direct roof, basic roof, and key layers show caving-fracture and caving-local cracks respectively as the working face advances. Different degrees of movement states such as no breakage, no breakage - only bending and sinking, etc., also increase the filling cost and equipment investment. Therefore, it is necessary to scientifically design the control degree of the filling rate in combination with the overlying rock con...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 张强张吉雄齐文跃欧阳神央李猛孟国豪
Owner CHINA UNIV OF MINING & TECH
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