小净距隧道爆破对加固既有隧道震动影响数值模拟研究  

Numerical Simulation of the Influence of Small-Interval Tunnel Blasting on the Reinforcement of the Existing Tunnel

作　　者：李萍萍[1] LI Pingping

机构地区：[1]杨凌职业技术学院,陕西咸阳712100

出　　处：《科技创新与应用》2023年第4期13-15,20,共4页Technology Innovation and Application

摘　　要：该文以实际的工程为依托,主要研究新建小净距隧道的爆破对加固既有隧道的震动影响。建立模型进行有限元计算,通过计算分析既有隧道最大主拉应力和既有隧道边墙X方向位移。结果得出,在某个值内,弹性模量增大,钢拱架间距减小,钢拱架增加,则抗爆加固效果提高;当弹性模量为23 GPa左右时,衬砌位移值小,则抗爆效果好。Based on the actual project,this paper mainly studies the vibration effect of the blasting of the newly built smallinterval tunnel on the reinforcement of the existing tunnel.A model is established for finite element calculation,and the maximum principal tensile stress of the existing tunnel and the x-direction displacement of the existing tunnel side wall are calculated and analyzed.The results show that,in a certain value,with the increase of elastic modulus,the decrease of steel arch spacing and the increase of steel arch,the antiknock reinforcement effect is improved.When the elastic modulus is about 23 GPa,the lining displacement value is small,and the antiknock effect is good.

关 键 词：小净距隧道 爆破震动 加固 有限元计算 数值模拟 

分 类 号：TU352[建筑科学—结构工程]