Dynamic disturbance damage of rock mass in layered blasting of deep underground plant

This paper established a constitutive model for rock dynamic tension based on HJC and TCK, and achieved the material model embedding through the LS-DYNA UMAT secondary development module analyzed the effect of blasting load, in-situ stress unloading and coupled load on damage distribution of surrounding rock of factory building during layered excavation. Studies have shown that the damage degree of the surrounding rock near the outline of the plant is the largest during the blasting excavation of deep underground powerhouses; when the in-situ stress level is low, the surrounding rock damage near the excavation surface is mainly affected by the blasting load, when the in-situ stress level is high, the surrounding rock damage near the excavation surface caused by the blasting load will be squeezed by the ground stress; in the remote excavated area, the surrounding rock damage is mainly caused by the redistribution of in-situ stress.