Method for designing supporting parameters of transition support for mixed mining face of filling and fully-mechanized mining

Patent metadata

Field	Value
Publication number	US-10301939-B2
Application number	US-201615770500-A
Country	US
Kind code	B2
Filing date	Nov 18, 2016
Priority date	Apr 29, 2016
Publication date	May 28, 2019
Grant date	May 28, 2019

Abstract

Disclosed is a method for designing supporting parameters of a transition support for a mixed mining face of filling and fully-mechanized mining. The method includes: first, determining a total length of a mixed mining working face and a length of a filling section according to requirements of a coal mining production capacity of the mixed mining working face and a filling capacity of the filling section working face; then, establishing a mixed mining numerical model of filling and fully-mechanized mining by using three-dimensional distinct element software, and simulating and calculating a caving height of a roof of a transition section and a stress influence range of the transition section when a filling rate of a mined-out area of the filling section changes; based on a result of numerical simulation and calculation, performing curve fitting according to a correlation coefficient to obtain a functional relationship between the filling rate and the caving height and a functional relationship between the filling rate and the stress influence range of the transition section; and finally designing supporting parameters of a transition support in combination with actual engineering geological parameters. The method can provide a reference for supporting design of a support, and enables a smooth transition between a filling support and a fully-mechanized mining support for a mixed working face, thereby further enriching filling mining theories and expanding the application range of filling mining.

First claim

What is claimed is:

1. A method for designing supporting parameters of a transition support for a mixed mining face of filling and fully-mechanized mining, comprising: first, determining a total length of a mixed mining working face and a length of a filling section working face according to requirements of a coal mining production capacity of the mixed mining working face and a filling capacity of the filling section working face; then, establishing a mixed mining numerical model of filling and fully-mechanized mining by using three-dimensional distinct element software according to tests of physical and mechanical parameters of coal rock in a working face area, and simulating and calculating a caving height of a roof of a transition section and a stress influence range of the transition section when a filling rate of a mined-out area of a filling section changes; based on a result of numerical simulation and calculation, performing curve fitting according to a correlation coefficient to obtain a functional relationship between the filling rate and the caving height and a functional relationship between the filling rate and the stress influence range of the transition section; and finally, determining parameters of a support of the transition section in combination with actual engineering geological parameters, wherein specific steps of the method are as follows:
(1) determining the total length of the mixed mining working face and the length of the filling section working face according to the requirements of the coal mining production capacity of the mixed mining working face and the filling capacity of the filling section working face;
(2) establishing the mixed mining numerical model of filling and fully-mechanized mining by using the three-dimensional distinct element software according to the tests of the physical and mechanical parameters of coal rock in the working face area;
(3) under the premise that a mining height, the total length of the mixed mining working face, and the length of the filling section working face are determined, simulating the caving height H of the roof of the transition section and the stress influence range of the transition section when the filling rate of the filling section changes;
(4) performing curve fitting according to the correlation coefficient to obtain the functional relationship between the filling rate and the caving height and the functional relationship between the filling rate and the stress influence range of the transition section;
(5) calculating a caving height H′ of the transition section of the mixed mining working face according to a designed filling rate in practical engineering, and performing calculation using the following formula to determine supporting strength of the support of the transition section:
F=γH′

in which: γ is 2.5 MPa/100 m; and
(6) calculating a stress influence range S′ of the transition section of the mixed mining working face according to the designed filling rate in practical engineering, and performing calculation using the following formula to determine a number of supports of the transition section:

N
≥
n

=

s
′

a

in which: N is a minimum positive integer greater than or equal to n, and
α is a width of a single transition support.

2. The method for designing supporting parameters of a transition support for a mixed mining face of filling and fully-mechanized mining according to claim 1 , wherein: the filling rate varies in a range of 60% to 80%.

Assignees

• Univ China Mining
• Pingdingshan Tianan Coal Mining Co Ltd
• China Pingmei Shenma Energy And Chemical Ind Group Co Ltd
• Xuzhou Zhongan Science & Tech Co Ltd

Inventors

• Zhang Jixiong
• Zhang Jianguo
• Zhang Qiang
• Sun Qiang
• Yin Wei
• Zhang Weiqing
• Yan Hao

Classifications

• E21F15/00

  Methods or devices for placing filling-up materials in underground workings (dams E21F17/103 {; chocks made of flexible containers filled with backfilling material E21D15/483}) · CPC title

• E21D23/00

  Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor ({transport of mine roof support units E21F13/008; } shifting of mine conveyors at the working face E21F13/08) · CPC title

• E21D23/0481 Primary

  Supports specially adapted for use in combination with the placing of filling-up materials (placing filling-up materials in underground workings per se E21F15/00) · CPC title

• E21C41/16

  Methods of underground mining (winning machines therefor E21C25/00 - E21C39/00); Layouts therefor · CPC title

• G06Q50/02 Primary

  Agriculture; Fishing; Forestry; Mining · CPC title