基于计算机视觉的深部软岩巷道变形破裂特征试验研究OA北大核心CSTPCD

The large deformation of surrounding rock caused by roadway rupture is a difficult problem in the stability control of surrounding rock in deep coal mining.Aiming at the problem,the evolution characterization of bulking deformation in surrounding rock of deep roadway was investigated,a large-scale similarity model test was conducted and a self-developed computer vision measurement system was used for deformation of surrounding rock precise field measurement and rupture identification characterization.The results show that with the development and evolution of the number,length and area of cracks can be divided into radial crack development stage and ring crack development stage.Displacement changes of the surrounding rock exhibit inconsistency,the vertical displacement of the surrounding rock mass is mainly in the radial crack development stage,and the horizontal displacement of the surrounding rock mass is mainly in the ring crack development stage.Shear failure occurs in both supported and unsupported roadway sections under loading conditions.However,support structures effectively restrict mutual slip and dislocation among block of surrounding rock after shear failure,thereby reducing bulking deformation of roadway.The deformation and fracture evolution of the surrounding rock in deep roadway is manifested by the shear failure of the surrounding rock along the structural plane,resulting in radial cracks cutting the surrounding rock mass.As load increases,dislocation and slip of the surrounding rock mass lead to ring cracks formation and subsequent bulking deformation.