The paper firstly defines the quasi-plastic strain tensor with fourthorder damage influence tensor,and assumes that the total strain is composed of elastic strain and quasi-plastic strain which doesn t create stress.

The multi cleavage behaviour of rock mass is simulated by introducing the damage tensor which is determined from in situ data of joint sets,and the net stress is also introduced to account the mechanical effects of jointed rock mass.

The dynamic response of the uniform Bernoulli-Euler beam was discussed by introducing a damage distribution function, and a “damage influence matrix(DIM)" was constructed, which can show the structural modal coupling induced by damage.

Study on the Blast-induced Damage Zone for Rock Excavation;