Study Of Roadway Stability Of The Extreme Distance Cross Mining In The Bottom

The problem of stability in roadway of extreme distance cross mining is the supporting problem of high stress roadway affected by mining,is one of the stress and difficult point studied.This dissertation uses theoretical analysis method,deriving the distribute figure of stress in the body of slate of bottom,draw changes and maximum positions that vertical stress,horizontal stress,shearing stress,calculate the most heavy destory depth of rock and the horizontal distance of face and the largest destory length in horizontal direction of the slate rock of district. And using analytic hierarchy process (AHP) to determine the weight of each factor, rock strength and normal distance two dominant factors determine stability in the body of slate of bottom.A computational rock mechanics software, FLAC3D,was introduced to simulate the feature of stress field in different vertical distance and position of mining face.In the surrounding rock is a moderately stable conditions, subject to cross-effects of mining coal face rock roadway, with the upper seam of the vertical distance between the more favorable for the 10m.By numerical simulation and field test results show that affected roadway by the dynamic pressure in the body of slate of bottom, using the yielding U-steel complemented backfilling and bolting and grouting support technology can effectively control the roadway surrounding rock deformation, achieve good support effect.