考虑循环爆破效应的Hoek-Brown弹塑性损伤模型及其工程应用  

A cumulative blasting damage model of rock based on Hoek-Brown criterion and its engineering application

作　　者：许梦飞 姜谙男[1] 蒋腾飞 张子龙 于海 XU Mengfei;JIANG Annan;JIANG Tengfei;ZHANG Zilong;YU Hai(Institute of Road and Bridge Engineering,Dalian Maritime University,Dalian,Liaoning 116026,China;Construction Branch of Shanghai Civil Engineering Group Co.,Ltd.of CREC,Shenyang,Liaoning 110000,China)

机构地区：[1]大连海事大学道路与桥梁工程研究所,辽宁大连116026 [2]中铁上海工程局集团有限公司建设分公司,辽宁沈阳110000

出　　处：《岩石力学与工程学报》2020年第S01期2683-2692,共10页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51678101);中央高校基本科研业务费专项资金项目(3132014326);吉林省交通运输项目(No.2017ZDGC–4)。

摘　　要：针对钻爆法开挖隧道围岩损伤区数值计算方法的不足,建立考虑循环爆破效应的Hoek-Brown(以下称H-B)弹塑性损伤模型并给出数值解法。首先,根据疲劳损伤理论推导了中远场循环爆破累积损伤演化公式,将爆破损伤与应力重分布造成的塑性损伤进行耦合,建立基于广义H-B准则的岩石弹塑性损伤模型;其次,利用完全隐式的应力回映算法和算子分离法给出上述损伤模型的数值解法;最后,将该模型应用于大连地铁工程的围岩稳定性分析当中,通过现场声波测试验证了循环爆破累积损伤演化公式,并对研究断面的位移值和损伤区分布特性进行计算。结果表明:循环爆破累积损伤演化公式能够较好的表达循环爆破作用下岩体损伤的演化规律,同时所建弹塑性损伤模型可以反映不同爆破次数下围岩损伤区的分布特性,比传统方法更具有优势,对工程安全设计具有较好的指导作用。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.

关 键 词：岩石力学 围岩损伤区 耦合破坏作用 广义Hoek-Brown准则 循环爆破 现场声波监测 

分 类 号：TU45[建筑科学—岩土工程]