doi:10.16186/j.cnki.1673-9787.2020090083

Received:2020/09/18

Revised:2021/03/22

Published:2021/11/15

Study on the technology of gob-side entry retaining by roof cutting to release pressure in fully mechanized mining working face with high stress

ZHENG Lijun 1, WANG Wen 2, ZHANG Guangjie 3

1.Guhanshan Coal Mine， Henan Coking Coal Energy Co. ， Ltd. ， Jiaozuo  454000 ， Henan， China;2.School of Energy Science and Engineering， Henan Polytechnic University， Jiaozuo  454000 ， Henan， China;3.Henan Institute of Technology， Henan Polytechnic University， Jiaozuo  454000 ， Henan，China

Abstract:To research the gob-side entry retaining mining technology under special geological conditions such as large buried depth ， high stress and hard roof ， taking the 1604 fully mechanized working face of Guhanshan coal mine of Henan Coal Energy Co. ，Ltd.as the engineering geological background ， based on the combination of theoretical analysis and numerical simulation ， the movement law of gateway roof was studied ， the key parameters of gob-side entry retaining were determined ， and the engineering test was carried out on site. The results showed that： The directional presplitting blasting could block the stress transmission of the basic rock above the gateway and goaf ， and achieved the purpose of pressure relief and presplitting ， When the cutting height was 12.3 m ， the lower key strata could be cut off； The average roof subsidence of gob-side entry retaining was 256 mm ， the average wall displacement of goaf was 214 mm， and the surrounding rock of gob-side entry retaining tended to be stable after 110 m behind the working face， which could meet the requirements of safety production. The research results could provide technical reference for gob-side entry retaining mining under similar geological conditions.

Key words:fully mechanized mining working face;roof cutting to release pressure;gob-side entry retaining;directional presplitting blasting key strata;surrounding rock control;numerical simulation

 高应力综放工作面切顶卸压沿空留巷开采技术研究_郑立军.pdf