Study On Technology Of Pre-stressed Bolt (Cables) Supporting In Inclined Roadway

More than 70 percent of energy is coal which occupies a pivotal position in construction of national economy in our country.Because of the complexity of distributing conditions of coal seam, the inclined coal roadway is ubiquitous. The keys of mining successfully and producing safely are building the compatible calculation model of bolt (cable) and solving the problem of reinforcement of the inclined coal roadway. They are needed lucubrated and researched imminently.The paper is on the basis of the mechanized roadway of 8th coal seam of Wulan mine coal, analyzes the basic theory and design method of the bolt (cable) systematically, lucubrates the control mechanism of the surrounding rock by pre-stress bolt, expatiate the reinforcement mechanism of the stratified rock roof by pre-stress bolt, and point out that it is significant to stability of steep roadway reinforcement to bringing reasonable pre-stress bolt into the reinforcement parameter design of inclined coal seam roadway bolt.Based upon the theory analysis and local research and the theory of surrounding rock releasing rock and inclined caving arch, there are three calculation model of the inclined coal seam roadway bolt reinforcement. The prime reinforcement project is confirmed by contrasted between the models and the monitoring of surrounding rock releasing ring. Based on the theory analysis of tangential anchor-hold of the inclined coal roadway bolt, the necessity of calculation of inclined coal seam bolt shear capacity is pointed out and the calculation expressions of the bolt shear capacity are found. By using finite difference software FLAC, this paper analyze the rule of mine pressure distribution, find out that the roof , upside of the low side and high side of the roadway are main objects when steep coal roadway is reinforced. In addition to, floor heave in roadway should be noticed. By the numerical simulation analysis to roadway floor lowering and stress distributing change, the safety and credibility of new reinforcement project are validated. Surrounding rock releasing ring and abscises layer in gateway floor and constringency transmutation are monitored and analyzed, consequently, the safety and credibility of the calculation model and reinforcement project are proved.The research and practice of this paper advance the engineering analogue method of inclined coal seam roadway reinforcement to quantitative analysis, and provide a new way for calculation of press and transmutation of inclined coal roadway surrounding rock reinforcement. It must be a important reference for inclined coal roadway reinforcement.