doi:10.16186/j.cnki.1673-9787.2021010080

Received:2021/01/18

Revised:2021/05/11

Published:2022/01/10

Study on coordinated control technology of surrounding rock in self-made roadway without coal pillar in roof-cutting and pressure-relief of fully-mechanized caving face with deep buried thin bedrock

ZHAO Shehui 1, ZHANG Guangjie 2, WANG Wen 3

1.Zhaogu （ Xinxiang） Energy Co. ,Ltd. ,Jiaozuo Coal Industry Group ,Xinxiang  453634 ,Henan,China；2.Henan Institute of Technology,Henan Polytechnic University,Jiaozuo  454000 ,Henan,China；3.School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo  454000 ,Henan，China

Abstract:  In order to solve the problem of support difficulty of deep gob side entry retaining affected by mining，taking the gob side entry retaining of 18060 fully mechanized top coal caving face in Zhaogu No.1 mine as the engineering background，based on the movement of surrounding rock structure and mechanical transfer characteristics of overlying rock，the coordinated control system of surrounding rock of deep gob side entry retaining was proposed.The study results showed that the directional presplitting blasting technology could cut off the key strata under the roof of the retaining roadway and formed a short wall beam structure; Compared with no roof cutting，the lateral abutment pressure of roadway after roof cutting decreased by 14.17 MPa( 37.67% ) ,and the peak vertical stress of roof decreased by 5.22 MPa( 22.5% ) ; The rock pressure on the cutting side was significantly lower than that on the non cutting side，and the influence range of cutting was about 30 m; The maximum shrinkage of the two sides of the retained roadway was 471 mm，the maximum approach of the roof and floor was 727 mm，and it started to stabilize about 200 m behind the working face.The field application effect was good，which could provide technical reference for the application of roof-cutting and pressure-relief without coal pillar self forming roadway under similar engineering conditions.

Key words:coal pillar;roof-cutting and pressure-relief;roadway without coal pillar;presplitting blasting;sur-rounding rock;coordinated control

 深埋薄基岩综放工作面切顶卸压沿空留巷围岩协同控制技术研究_赵社会.pdf