The Effect Of Mining Protecting Strata To The Stability Of Roadway On The Overlying Strata

Based on the characteristic and law of the roadway on the overlying strata after mining protecting strata, Multi-research methods, such as the theoretical analysis, the computer numerical simulation, simulation of similar materials, filed research was synthetically used in this paper. It processed the systemic research to the surrounding rock stress distribution, the law of distortion, the influent factor, supporting methods and Marithan grouting. The relationship of roof flexure and support resistance, the stress distribution characteristics and the distortion laws and the general technical parameters of Marithan grouting were found. The pressure relief angle was 50°, the reason for the distortion of roadway on the pressure relief area was that there was vertical fissure, the surrouding rock was disturbed by vertical stress and shear stress, it was loose and the roof was crushing, the effect of bolting was better than U-type supporting. When mining was close to the relaxing area, Marithan grouting coule re-generate roof and improve its strength. On other hand was reasonable layout of roadway, such as avoiding abutment area and layouting the roadway on the stress decreasing zone. Results in this paper did great good to the supporting and reasonable layout of roadway on the overlying strata.