Abstract:
Under the action of frequent blasting disturbance, the micro-cracks in the deep roadway surrounding rocks are constantly generated, expanded and penetrated, forming macro-fractures, and the rock mass instability disaster is becoming increasingly prominent.In this paper, the FLAC
3Dsoftware is used to study the damage law of the surrounding rock under the condition of high stress blast disturbance, considering different pressure coefficients.The results show that the stress environment obviously affects the damage characteristics of the surrounding rock of the roadway.The initial stress conditions determine the damage area and the shape distribution of the surrounding rock of the roadway.The blasting disturbance will aggravate the damage of the surrounding rock of the roadway and accelerate the destruction speed.Compared with the initial stress state, the blasting disturbance causes the surrounding rock in the roadway to be loosened, the stress concentration and the scope of influence are increased.At the same time, the distribution form and range of displacement in the surrounding rock are changed, and the maximum displacement in the surrounding rock is increased.The greater the difference between the two-way load on the surrounding rock of the roadway, the deeper the plastic zone after the blasting action is used, and the greater the damage increase.The range of the plastic zone of the roadway surrounding rock is much larger than the relaxation zone.The support engineering should control the surrounding rocks in the slack zone to avoid collapse.The study provides support for surrounding rock control in deep roadways.