大型地下厂房开挖爆破振动动力响应数值模拟  

Numerical simulation of dynamic response of large underground powerhouse subjected to blasting vibration

作　　者：姚强[1,2] 杨兴国[1,2] 陈兴泽[2,3] 李洪涛[1,2] 

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室,成都610065 [2]四川大学水利水电学院,成都610065 [3]国电大渡河流域水电开发有限公司,成都610041

出　　处：《振动与冲击》2014年第6期66-70,76,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(51009104);四川省科技支撑计划(2008SZ0232)

摘　　要：针对向家坝水电站主厂房爆破施工诱发振动效应对围岩稳定及相关结构安全性影响,通过动力有限元数值模拟,研究地下厂房在开挖爆破振动荷载作用下动力响应。结果表明,顶拱拱脚处质点振速及拉应力最大,拱脚以上质点振速及最大拉应力迅速衰减;岩锚梁黏结面底部或顶部拉应力最大,与水平向质点振速相关性较好;高边墙质点振速与最大拉应力随高差增加而减小。综合分析数值计算结果与大量爆破振动实测数据,建议围岩及混凝土龄期大于28d的岩锚梁安全质点振速分别取15 cm/s及10 cm/s,且有一定安全储备。Aiming at the safety of the main powerhouse in the Xiangjiaba Hydropower Station,the blasting vibration response of the rock masses of the powerhouse during excavation process was simulated by using the dynamical finite element method （FEM）.The simulation results show that,the vibration velocity and tensile stress at the feet of top arch are very large,and rapidly decrease with the increase of height.The tensile stress at the bottom or top of rock anchor beam is also large,and has a close correlation with the horizontal vibration velocity.The vibration velocity and tensile stress at the sidewall decrease with the increase of height difference.Comprehensily analysing the simulated results and field monitoring data,the safe vibration velocity levels were suggested to be 15cm/s and 10cm/s respectively for surrounding rock mass and anchor concrete.

关 键 词：地下厂房 爆破振动 数值模拟 

分 类 号：TD235[矿业工程—矿井建设]