Study On Basic Parameters Of Roadway Caving Mining In Steep Coal Seam Experiment

Steep coal reserves of the national coal reserves of about 15% ~ 20% or so, especially in China's western mining area more than 50% of mine mining steep coal seam is urgent. Nasty steep coal seam mining has been one of the problem of mining technology.This paper firstly to build Jian Jiang coal as the research object, by similar material simulation, numerical simulation and theory analysis combination of integrated research methods to mining, "double lane level of pseudo inclined small face" mix mining and big push degrees of roadway sub-level caving roadway mining methods of three kinds of stability and analyzed, determine the big push degrees of roadway sub-level caving mining scheme for optimal. Secondly use similar material simulation study the big push degrees caving roadway sub-level caving migration regularity and thickness of coal seam and coal seam inclination and the relationship between stoping rate. Main draw the following conclusions:(1)"False inclined small face mix spirit" mining methods stress release area, a hump shape distribution of roadway displacement contour is asymmetric, stretch the roof and floor of roadway destruction is given priority to, two help criterion with shear failure is given priority to, the plastic damage in coal seam and the bottom contact surface are significantly extends along the surface, and with the increase of coal seam mining Angle, the better the stability of surrounding rocks.(2)Coal seam, Angle than 70 caving process easy to form the arch structure, and high Angle, arch structure, the greater the structure is also more stable; Less than 60 Angle when coal caving mouth, not in the above form arch structure.(3)Coal seam thickness of coal seam Angle, the same small recovery rate is high. Other conditions, the same large dip Angle, caving coal along toward the flow Angle and tendency. When coal seam in60?~80?, stoping rate Angle for 85%, with the increase of coal seam, dip the recovery rate reduced.This paper studies for acute steep coal seam roadway sub-level caving mining theory and similar conditions seam mining has certain reference value.