Abstract: From creep experiments of deep mudstones in digital speckle method, the phenomenon of deformation concentration that occurs in the surface of specimen is obvious under the first step loading. And it indicates that the damage begin to appear in rock mass under the relatively low stress level. With the increasing of loading level, a shear fracture band is formed until the whole specimen failure. Then the BKS model which can reflect rock damage effect is put forward by introducing damage variable Dt. By using FISH function, the model’s program composition is realized in the FLAC3D. Finally, the model is applied to simulating the bolting surrounding rock control in Kouzidong mining area. The result shows that creep failure zone increases and occurs beyond the anchorage range due to the damage characteristics, and non-continuity failure is obvious during deep surrounding rock. Meanwhile, it is confirmed that the numerical simulation considering damage effect can objectively reflect the creep failure characteristics of deep rock mass by contrasting simulated results with detection results of field borehole. Consequently, there is a guiding significance for the research on failure mechanism of deep roadways.

Key words: deep rock mass, bolting roadways, damage effect, creep failure, digital speckle