考虑循环爆破效应的Hoek-Brown弹塑性损伤模型及其工程应用

doi:10.13722/j.cnki.jrme.2019.1062

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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.

Key words： rock mechanics damage zone of surrounding rock coupling failure generalized Hoek-Brown criterion cyclic blasting field acoustic monitoring

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	Articles by authors
	XU Mengfei1
	JIANG Annan1
	JIANG Tengfei1
	ZHANG Zilong1
	YU Hai2

Cite this article:

XU Mengfei1,JIANG Annan1,JIANG Tengfei1, et al. A cumulative blasting damage model of rock based on Hoek-Brown criterion and its engineering application[J]. , 2020, 39(S1): 2683-2692.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.1062 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/IS1/2683

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