Influence Research of Underground Caverns Blasting Excavation on Excavation Damage Zone of Adjacent Cavern

Abstract

The influence of the single cavern blasting excavation in underground caverns on the stability of surrounding rock of adjacent caverns can not be ignored.In–situ blasting vibration test and dynamic finite element analysis were used to study the laws of blasting seismic wave propagation, two different material constitutive models were adopted, compared with measured data,to select material constitutive model which was more in line with the dynamic characteristics of rock mass in underground caverns.On this basis, the influence mechanism for blast–induced EDZ(Excavation Damage Zone) of the adjacent cavern is studied through the method of numerical simulation. The results show that the numerical simulation resulted by adopting kinematic hardening model were more close to measured data than adopting ideal elastic–plastic model; the middle part of adjacent tunnel side wall facing blasting had the largest damaged rock mass range; both sides of the arch and the foundation rock of the adjacent cavern emerged damaged rock mass area, and the area of adjacent tunnel side wall facing blasting was larger than side wall not facing blasting.