关键词: 巷道挖底, 帮顶稳定性, 底鼓治理, 承载圈

Abstract: In order to develop a more safe and reliable technology of roadway repair, In view of the phenomenon that coal mine roadway bottom ripping may influence the stability of the roadway roof and two sides. The similar material simulation test and engineering project analysis was carried out to research the influence of roadway bottom ripping for the stability of sides and roof. The analysis results show that：The roadway floor, roof and two sides are an interactive whole. Roadway bottom ripping will cause the stress distribution characteristics in roadway floor, induce the load-bearing ring move to the deep that can cause tunnel breakage depth increases in both sides and roof, it’s not conducive to the overall stability of the roadway. Then with the conclusion of the research, this article put forward the general principles of roadway bottom ripping: reinforcing roof and two sides before roadway bottom ripping. Roadway repair should mainly clean up the rock mass within the load-bearing ring. Try not to touch the load-bearing ring, Reserved corner or do circular arc transition are beneficial to the overall stability of the roadway when roadway bottom ripping.