METHOD FOR REDUCING WITHDRAWAL ROADWAY ROOF PRESSURE AT END OF COAL FACE MINING

WIPO Patent Application WO/2021/093122

A1

Disclosed is a method for reducing withdrawal roadway roof pressure at the end of coal face mining, comprising the following steps: step 1, determining an optimum distance between a final fracture position of a main roof (1) of a coal face and a non-production side of a withdrawal roadway (7); step 2, calculating the critical size of separated coal pillars (8) between the coal face and the withdrawal roadway (7); step 3, determining a stop-mining isobaric position; and step 4, implementing, when the coal face reaches the stop-mining isobaric position, a stop-mining isobaric pressure on the basis of the optimum stop-mining isobaric position determined in step 3, and after a roof weighting phenomenon occurs after the mining of the coal face has stopped for a period of time, continuing to mining the coal face to a stop line to complete coal mining operations. The problem of high withdrawal roadway roof pressure at the end of coal face mining can be solved, and the periodic weighting position of the main roof is changed by taking a stop-mining isobaric pressure measure in an appropriate position at the end of coal face mining, thereby reducing the withdrawal roadway roof pressure at the end of coal face mining, and ensuring the smooth withdrawal of the coal face.

NING JIANGUO (CN)
QIU PENGQI (CN)
SHANG HEFU (CN)
LI XUEHUI (CN)
WANG JUN (CN)
HU SHANCHAO (CN)

PCT/CN2019/129988

May 20, 2021

December 30, 2019

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UNIV SHANDONG SCIENCE & TECH (CN)

E21D15/60

CN102086769A	2011-06-08
CN107654250A	2018-02-02
CN2934574Y	2007-08-15
CN108930548A	2018-12-04
SU1177485A1	1985-09-07
RU2513607C2	2014-04-20

QINGDAO JINJIA PATENT AGENCY (GENERAL PARTNERSHIP) (CN)

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