Control of surrounding rock structure for gob-side entry retaining by cutting roof to release pressure and its engineering application
HE Manchao
CHEN Shangyuan
GUO Zhibiao
YANG Jun
GAO Yubing
Abstract：In light of the problems of cockamamie construction technology and high cost of constructing roadway existing in traditional gob-side entry retaining technology,an innovative no coal pillar mining technology by cutting roof to release pressure was proposed.Based on the movement laws of overlying strata in traditional gob-side entry retaining technology,the mechanism of pressure relief of gob-side roof was studied.In addition,several "surrounding rock structure-roadside support body" mechanical models were established considering different types of roof state,and the design formula of each roadway-side supporting resistance was obtained.The results show that the lower basic roof fall enough and then support the upper roof better by presplitting blasting,thereby limiting the rotational deformation of upper roof and reducing the impact load of roof break.The frature location of roof is shifted to the gob side,the length of the roof cantilever beam is reduced and the short cantilever beam is formed by roof cut,thus reducing the additional load of roadside support.Apart from that,some surrounding rock control technologies such as directional pre-splitting roof cutting technology,the constant resistance large deformation (CRLD) bolt and roadside intensive individual props were proposed.These technologies have been used in 12201 working face of Halagou coal mine and a good effect of field application was achieved.
Keywords：gob-side entry retainingsurrounding rock structurepressure releasing mechanismshort cantilever beam by roof cuttingcontrol technologyengineering application
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：11( 959-969 )