Research on deformation control of roadway in reverse fault fracture zone of Tunbao Coal Mine

Abstract

In reverse fault fracture zone of Tunbao Coal Mine, the coal pillar side roadway is affected by mining, which leads to large roadway deformation, roadway floor heave, coal pillar side wall heave, and local subsidence of roadway roof. Anchor stress was monitored by anchor dynamometer, and roadway stress distribution and roadway deformation were studied by means of PASAT-M detection. The results show that the peak value of anchor stress on coal pillar side of belt roadway appears at 10-15 m of the leading working face and the one of anchor stress on upper side of track roadway appears at 5-10 m of the leading working face. The anchor stress, surrounding rock stress and roadway deformation at different positions are all affected by T2 reverse fault, and the stress and deformation are distributed near the reverse fault. The medium risk area of surrounding rock stress is relatively concentrated within 25 m from the reverse fault. According to the research results, a comprehensive control measure of roadway reinforcement and large pore pressure relief was proposed. The results of engineering practice show that the measure provides a stable supporting force for surrounding rock and can apply to preventing and controlling surrounding rock deformation in the area affected by the reverse fault of Tunbao Coal Mine.

Keywords

• fully mechanized caving face
• surrouding rock control
• reverse fault fracture zone
• reserved pillar side roadway deformation
• anchor stress
• reinforcement support