Study On The Supporting Measures And Deformation Mechanism Of The High Stress Soft Rock Roadway

Along with the technical development, the demand of coal climbs gradually, the coal mine mining scale and the mining depth also gradually increase along with it, the high stress distorts the soft crag tunnel stability problem even more to highlight greatly, however the high stress soft crag tunnel supports and protections difficult problem is puzzling many domestic and foreign experts continuously, whether effectively solves the high stress big distortion tunnel supports and protections difficult problem, is at present solves the energy supply and demand scarce and question and so on safeguard safety in production keys. In order to solve the high stress big distortion tunnel supports and protections difficult problem, the domestic and foreign experts have conducted the massive experimental study and the project application, proposed many different supports and protections ways, in which often uses has the union supports and protections, the release of pressure supports and protections and the contractibility through metal and so on.But still had many deficiencies, like the union supports and protections had two repair problems in the field application; Release of pressure supports and protections existence destruction adjacent formation own integrity, reduces insufficiencies and so on adjacent formation own bearing capacity; The contractibility through metal amount of deformity is small, cannot satisfy the high stress to distort the soft crag tunnel to distort greatly needs to wait for the question. Many questions bring the adverse effect for the coal mine safety production. Therefore needs to study the high stress to distort greatly thoroughly the soft crag tunnel adjacent formation distortion characteristic and the adjacent formation and the supports and protections sports association synergy mechanism, studies one kind to be able to satisfy the high stress to distort greatly the soft crag tunnel distortion characteristic supports and protections method, solves the high stress to distort greatly the soft crag tunnel supports and protections difficult problem, has the high research value and the significance.In view of the high stress soft crag tunnel amount of deformity big, the initial period distortion speed big as well as it had characteristics and so on effectiveness, this article studies the high stress to distort greatly the soft crag tunnel adjacent formation destruction distortion characteristic as well as analyzes the high stress to distort greatly the soft crag tunnel supports and protections body jitter mechanism; Discusses the high stress soft crag tunnel adjacent formation and the supports and protections sports association synergy mechanism, studies the high stress soft crag tunnel best depressurization quantity the concept and the computational method, then the establishment sets at the hole depressurization supports and protections model; Studies the high stress soft crag tunnel one time to become the lane supports and protections project countermeasure and the supports and protections plan optimization principle.The present paper is take the Shanxi Dong He coal mine2308working surfaces as the project example, through research techniques and so on theoretical analysis, value simulation, analog simulation and scene monitor, unifies the theory and the practice.Establishes the tunnel using the RFPA value simulation software to excavate the model and the supports and protections model, the analysis does not have the supports and protections, the anchor wire rope+steel awning supports and protections as well as sets at the hole depressurization to support and protect under three different supports and protections ways the tunnel adjacent formation destruction evolution rule.Through to three different supports and protections ways under the tunnel adjacent formation destruction process evolution simulation, separately from the tunnel adjacent formation stress, the displacement and the distortion characteristic analyzes three supports and protections ways the analogue result, compared with three kind of supports and protections way fit and unfit quality, and unified the analog simulation and the site survey data then had proven set at the hole depressurization to support and protect this way in the high stress soft crag tunnel to be able the good supports and protections function, thus also big reduced the high stress soft crag tunnel after the tunneling the repair and the supports and protections expense, realized the high stress soft crag tunnel one time to become the lane supports and protections technology.