Study on the Evolution Law of Deep Rock Cracks and the Mechanism of Graded Gradient Support

The surrounding rock of deep roadway is mostly composed fractured rock. deformation complicated, which not only involves the stress change, but also support means. This paper aims to study and fracture evolution law in underground engineering. According rebalancing characteristics, after excavation, development characteristics cracks are studied. At same time, different seepage zones divided according relationship between failure its total stress–strain, that is, complete zone, shielding proto-rock zone. crack distribution studied, graded control gradient proposed. In broken area, bearing shell outside achieved by means bolting high-strength grouting. As pore sizes plastic zone gradually decrease along radial direction roadway, open change into closed cracks, it difficult for ordinary grouting materials better consolidation filling. Therefore, small particle size reinforcement (fracture zone) reinforced with nano-scale material, internal three-dimensional formed combining anchor cable. research plays an important guiding role stability