Bearing effect and mechanical analysis of the anchoring system of"prestressed anchor bolt-surrounding rock"
In view of the inharmonious engineering problem of surrounding rock deformation and stress,the stress distribution and influencing factors of"prestressed anchor bolt-surrounding rock"anchoring system are systematically studied by theoretical analysis and numerical simulation.The results show that the prestress of bolts can effectively improve the surrounding rock stress environment,the longer the length of bolt and the smaller the row spacing,the better the control effect on surrounding rock,and the obvious compressive stress zone is formed in the shallow surrounding rock,which can effectively control the deformation of roadway.The anchorage agent and bolt member directly affect the stress distribution of the anchorage system.The effect of diffusion prestress of the spherical plate is obviously better than that of the flat plate.The variation of stress value in the area from the end of the anchorage section to the end of the anchorage section shows an exponential curve.The research results can provide theoretical basis for bolt support design.
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