(1. Institute of Road and Bridge Engineering，Dalian Maritime University，Dalian，Liaoning 116026，China；2. Construction Branch of Shanghai Civil Engineering Group Co.，Ltd. of CREC，Shenyang，Liaoning 110000，China)
Abstract：Aiming at deficiency of the numerical calculation method of damage zone of surrounding rock in tunneling by drilling and blasting，the elastoplastic damage model based on generalized Hoek-Brown criterion(H-B) is established which considering the cyclic blasting effect. First of all，the rock cumulative damage(RCD) evolution formula under cyclic blasting effect located in far-field is deduced based on fatigue damage theory. The RCD is coupled with the plastic damage caused by stress redistribution and an elastoplastic damage model based on generalized H-B criterion is established. Secondly，the numerical solution of the damage model is given by using completely implicit stress reflection algorithm and operator separation method. Finally，the model is applied to the stability analysis of surrounding rock of Dalian metro project. The RCD evolution formula is verified by field acoustic monitoring. The displacement value and damage area distribution characteristics of the studied section are calculated. The results show that the RCD formula can well express the rock damage evolution law under cyclic blasting. The elastoplastic damage model can reflect the distribution characteristics of surrounding rock damage area under different blasting times，which is more advantageous than the traditional method and has a better guiding effect on engineering safety design.
许梦飞1，姜谙男1，蒋腾飞1，张子龙1，于 海2. 考虑循环爆破效应的Hoek-Brown弹塑性损伤模型及其工程应用[J]. 岩石力学与工程学报, 2020, 39(S1): 2683-2692.
XU Mengfei1，JIANG Annan1，JIANG Tengfei1，ZHANG Zilong1，YU Hai2. A cumulative blasting damage model of rock based on Hoek-Brown criterion and its engineering application. , 2020, 39(S1): 2683-2692.
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2020, Vol. 39 
