岩土力学2011，Vol.32Issue(5)：1531-1537,7.
深埋隧洞爆破开挖扰动损伤效应的数值模拟
Numerical simulation of blasting excavation induced damage to deep tunnel
摘要
Abstract
Blasting excavation disturbance is an important influence factor to the inoculation and evolution of deep tunnel damaged zone.According to the drilling and blasting excavation process of the nmnel, the disturbance effects induced by blast load and transient unloading of excavation load are analyzed; and based on the LS-DYNA dynamic finite element program, the numerical simulation method of blasting excavation disturbance is proposed tbat using nodes reaction to simulate the constraint of the awaiting excavation tunnel rock.contralling the change process of nodes reaction to simulate transient unloading of excavation load, and using blasting loading change curve to simulate the effect of explosion.After that, the blasting excavation induced damage of tunnel rock mass is analyzed by the method.The results show that the surrounding rock damage zone is mainly caused by the in-situ stress redistribution and increased by blasting load; the surroundjng rock damage zone is maximum when the transient unloading of excavation load is taken into account; andd in-situ stress is higher, the damage caused by transient unloading of excavation load is more remarkable.关键词
隧洞/爆破/损伤/瞬态卸荷/数值模拟分类
数理科学引用本文复制引用
陈明,胡英国,卢文波,严鹏,周创兵..深埋隧洞爆破开挖扰动损伤效应的数值模拟[J].岩土力学,2011,32(5):1531-1537,7.基金项目
国家973计划项目(No.2010CB732003) （No.2010CB732003）
国家自然科学基金项目(No.50909077,No.50725931,No.51097111). （No.50909077,No.50725931,No.51097111）
