锚杆系统低应变动力响应的数值模拟分析  

Numerical analysis of low strain dynamic response of anchorage bolt system

作　　者：陈建功[1] 张永兴[1] 

机构地区：[1]重庆大学土木工程学院,重庆400045

出　　处：《岩土力学》2007年第S1期730-736,共7页Rock and Soil Mechanics

基　　金：国家杰出青年科学基金(No.5062824);重庆市科技攻关计划项目(No.CSTC;2006AB7003)。

摘　　要：建立了锚杆-围岩结构系统三维轴对称有限元计算模型,并利用动力有限元法对锚杆系统瞬态动力响应进行了分析。对于完整锚杆系统,围岩质量较好、较为坚硬时,杆顶速度响应信号的衰减速度较快,锚杆杆底反射信号较不明显;围岩质量较差、较为软弱时,信号衰减速度较慢,杆底反射信号较清晰;在损伤锚杆系统中,当锚杆系统筋材存在损伤时,损伤处反射波较明显,而当锚固砂浆存在局部损伤时,损伤处的反射波不明显,但杆底反射波比较明显。The numerical experiment is mode by using finite element analysis. The dynamic responses are simulated for undamaged anchorage system and damaged anchorage systems by axis symmetry numerical calculate. For undamaged anchorage system,the signal of bar's top speed fade down quickly as the surrounding-rock is hard and the bar's bottom reflected signal is not clear. Meanwhile the signal of bar's top speed fade down slowly as the surrounding-rock is weak and the bar's bottom reflected signal is clear. For damaged anchorage system,the reflected signal of impairment is distinct as steel have impairment. When anchorage mortar has defect,the reflected signal of defect is indistinct but he bar's bottom reflected signal is distinct.

关 键 词：锚杆 动力响应 有限元 

分 类 号：TU476[建筑科学—结构工程]