Abstract:

The surrounding rock deformation of the goaf roadway was greatly affected by the mining

movement，which seriously affected the safety production of the 2301 working face of a mine in Shanxi Prov⁃

ince. Based on the mechanics model of simple supported beam，it is found that the main factors affecting

roadway floor heave are roadway width and horizontal stress through theoretical analysis. At the same time，

FLAC3D numerical software is used to simulate the changes of roadway floor heave under the two influencing

factors. The results show that the width of roadway retention has the most significant effect on the floor heave

volume of roadway，and the concentrated area of structural stress should be avoided as far as possible when

the gob roadway is arranged on site. According to the simulation results and the specific geological condi⁃

tions of the 2301 working face，the section size of the roadway is reasonably optimized，the support strength

of the wall is improved and the anchor cable of the floor is reinforced by grouting.

Key words:

gob-side entry retaining, floor heave, FLAC3D numerical simulation