Abstract:
To research support technology of coal roadway with high rock burst tendency passing through extremely close overlying goafs, taking the return airway and haulage roadway in No.2 mining area of Shanzai Coal Mine as objects, by using field measurement, we make investigation on stress areas formed near terminal mining line on overlying working face, and formulate corresponding support plans according to the ranges, stress states and exhibiting degree of rock burst in different areas. For pressurized zones formed in front of terminal mining line on overlying working face, using surrounding rock for pressure relief, reducing range distance, increasing the quantity of anchor lines, and installing single hydraulic props for reinforced support are rational measures. The result shows that the deformation of surrounding rock in pressurized zones is comparatively large. The maximum head-on displacement between the roof and floor is 730 mm. The maximum displacement of two sides of roadway is 150 mm. High frequency and low energy level are the exhibiting characteristics of rock burst. The deformation of the area underneath goafs is small, and has no rock burst behavior.