Abstract:

With the continuous increase of coal mining depth，many domestic mines have entered

deep mining，the stability of deep roadway surrounding rock is poor，the phenomenon of floor heave is prom⁃

inent，and the mine pressure is obvious. Based on the engineering background of a coal mine in Pingding⁃

shan mining area，the deformation and failure characteristics of the roadway surrounding rock were ana⁃

lyzed，and a combined support scheme of "four-level shotcrete + three-level wire rope mesh + three-level

anchor bolt + floor relief trough + wall grouting" was proposed. The distribution characteristics of the stress

field of the roadway surrounding rock were calculated using UDEC. It can effectively ensure the stress trans⁃

fer of roadway floor to the depth. When the width of pressure relief groove is 1 600 mm，the plastic zone of

roadway floor surrounding rock is 14.84 m，and the peak horizontal stress of roadway floor is transferred to

the depth by 14.5 m，which provides certain theoretical support for the deformation control of roadway deep

surrounding rock.

Key words:

deep mining, pressure relief groove, UDEC numerical simulation, surrounding rock

stress field, plastic zone