Mechanical mechanism and control technology of floor heave of high stress thick coal seam under dynamic pressure

In order to solve the problem of roodway floor heave of high stress thick coal seam under dynamic pressure in wuyang Coal Mine，Based on Rankine stress theory and treating the broken floor surrounding rock as loose body,the mechanism and control technology of floor heave are studied.Through this research,the Wuyang Coal Mine’s problem of floor heave in dynamic pressure roadway with high stress thick seam has been solved.The main conclusions of this paper are as follows:①Full-section extrusion flow of roadway surrounding rock leads to the floor failure of No.2 special return air roadway in No.76 mining area of Wuyang Coal Mine.②The main factors causing floor heave of roadway are the characteristics of surrounding rock,high horizontal stress,side abutment pressure of goaf in adjacent working face and failure to take reinforcement measures on floor.③The control of the floor must be placed in the same important position as the control of the roof.The reinforcement of the floor should be carried out while supporting the roof so as to make the whole roadway form an integral bearing structure.④ After adopting strong roof bolt and anchor cable support and full-length pre-stressed grouting anchor cable support technology in roadway,the deformation of surrounding rock meets the requirements,which not only effectively controls the floor heave of roadway,but also ensures the stability of roof and two sides,and ensures the overall stability of roadway.