Design of large spacing anchor rod support in thick and hard roof roadway
Aiming at the supporting conditions of thick and hard roof of No.15 coal seam roadway in Qiyi Mine,the physical and mechanical parameters of surrounding rock of No.15 coal seam roadway were obtained by means of theoretical analysis,laboratory test,engineering analogy and numerical simulation.It was determined that the loose range was about 0.65～0.8 m,which belonged to the small loose circle.The RMR scores of K2 limestone,mudstone and bauxite mudstone in the surrounding rock of the roadway were calculated to be 51,45 and 47 respectively,which belonged to the better rock mass of grade Ⅲ,which provided a certain basis for the selection of bolt length and strength.By analyzing the axial force,deviatoric stress,maximum principal stress and plastic zone distribution of bolt and anchor cable under four support schemes,the design of large spacing bolt support was put forward.It was considered that the bolt spacing of No.15 coal seam roadway was 1.2 m and the anchor cable spacing was 2.4～3.6 m,which can meet the support requirements.The research results provide some reference for the stability control of roadway surrounding rock under similar conditions.
thick and hard rooflarge spacegeological mechanics evaluationnumerical simulationsupport design
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