High ground pressure laneway stress transfer method based on fracturing ring

摘要

A high ground pressure laneway stress transfer method based on a fracturing ring. Fracturing is conducted by constructing a drill hole (1) according to a laneway (2) stress source; a circle of artificial weakening zone, i.e., "a fracturing ring (5)", is formed in a surrounding rock, the high stress (8-1) of the laneway (2) surrounding rock is transferred under the action of unloading, stress blocking and yielding, the impact energy is absorbed by an added weak structure area, and the influence of loads on deformation of the laneway surrounding rock is controlled. The fracturing ring (5) is the weakening zone with a certain width, the inner boundary is called as a guard circle (4), and the fracturing ring with a small belt width is called as a blocking circle and a blocking arc (9). The radius of the guard circle (4) is generally determined by a safety coal and rock pillar barrier which is reserved at the edge of a support and has a certain width. The width of the fracturing ring (5) is determined according to the surrounding rock structure, geological stress conditions and construction process conditions, and the higher the geological stress is, the wider the fracturing ring is. All target stratums for spreading stress are blocked by the blocking circle and the blocking arc (9). The blocking arc (9) of a hard hanging arch (7-2) approaches or is the boundary between a plastic zone (12) and a crushing zone (11) of a coal pillar.