摘要
针对爆破效应对围岩力学参数及渗透系数的劣化问题,根据岩石弹塑性力学、连续损伤力学、有效应力原理及渗透系数演化方程,提出了基于Hoek-Brown准则的岩体弹塑性损伤模型,并给出了模型的有限元数值求解算法.以甄峰岭隧道为工程依托,对所选断面开挖损伤区进行数值分析,通过声波检测手段确定爆破扰动范围及损伤值,修正计算力学参数和渗透系数.结果表明,考虑爆破效应后的开挖损伤区,位移值和涌水量均大于不考虑爆破效应时的数值,进行工程稳定性评价时应充分考虑爆破因素的影响.
Aiming at the deterioration of mechanical parameters and permeability coefficient of surrounding rock caused by the blasting effect,a rock elastoplastic damage model based on the Hoek-Brown criterion was proposed according to the rock elastoplastic mechanics,continuous damage mechanics,effective stress principle and permeability coefficient evolution equation.A finite element numerical solution algorithm of the model was suggested.Taking Zhenfengling tunnels as the project background,the excavation damage area of selected section was performed with the numerical analysis.The blasting disturbance range and damage value were determined by means of acoustic wave detection,and the calculated mechanical parameters and permeability coefficient were modified.The results show that the displacement value and the water inflow of excavation damage area considering the blasting effect are bigger than those with no consideration of blasting effect,indicating that the blasting effect should be fully considered in the engineering stability evaluation.
作者
许梦飞
姜谙男
蒋腾飞
申发义
白涛
XU Meng-fei;JIANG An-nan;JIANG Teng-fei;SHEN Fa-yi;BAI Tao(Institute of Road and Bridge Engineering,Dalian Maritime University,Dalian 116026,China;Jilin Provincial Expressway Group Co.Ltd.,Changchun 130000,China;Jilin Province Traffic Planning and Design Institute,Changchun 130000,China)
出处
《沈阳工业大学学报》
EI
CAS
北大核心
2020年第6期706-713,共8页
Journal of Shenyang University of Technology
基金
中央高校基本科研业务费专项基金项目(3132014326)
吉林省交通运输项目(2017ZDGC-4).
关键词
爆破效应
HOEK-BROWN准则
弹塑性损伤模型
求解算法
开挖损伤区
声波监测
位移值
涌水量
blasting effect
Hoek-Brown criterion
elastoplastic damage model
solution algorithm
excavation damage area
acoustic monitoring
displacement value
water inflow
