Based on the difficult problem of surrounding rock control in deep coal roadway with large section and thick top-coal

surrounding rock deformation and failure mechanism and its supporting technology are studied. The results show that

for deep coal roadway with large section and thick top-coal

plastic zone of top-coal presents “arched” or “inverted trapezoid” with wide upper and narrow lower

however plastic zone of immediate roof presents “rectangular”; the shoulder stable region exists in the immediate roof. Bedding surface shear failure effect mechanism for “inverted trapezoid” plastic zone is proposed: under the effect of high stress (especially high horizontal stress) and horizontal stress caused by larger roof subsidence; bedding surface between top-coal and immediate roof goes to shear failure

which causes coal body near bedding surface failure; and it promotes the formation of “inverted trapezoid” plastic zone. Based on above

high prestressed bolt with strip and steel mesh combining with diagonal cable and beam structure support is put forward. It is thought that diagonal cable can be anchored to the stability region in the shoulder; and it can limit the shear deformation of bedding surface between top-coal and immediate roof

and also can prevent the development of top-coal plastic zone from “arch” to “inverted trapezoid”. The research results have been successfully applied to roadway supporting.