摘要
采用动力有限元建立三维模型,并参考实际爆破振动速度,计算了开挖隧道位于既有隧道上部、左边和下部3种布置情况,通过分析既有隧道围岩的质点振动速度以及混凝土衬砌的应力分布,得出迎爆侧首先是纵波到达,因此垂直于壁面的质点振速要远远大于其他2个方向上的质点振速;随着应力波的传播,纵波的衰减指数大于面波的衰减指数.边界条件影响质点振动规律,质点振速在突变边界条件下的峰值衰减指数大于渐变边界条件下的衰减指数.另外,拱形结构的抗冲击荷载的能力大于平面的情况.
Based on actual tunnel excavation project, the three-dimensional finite element model of tunnel excavation was set up, including the three conditions when excavating tunnel was above, to the left of and below the existing tunnel respectively, and the particle vibration velocity and stress distribution were analyzed at the existing adjacent tunnel concrete lining. The calculation results show that longitudinal wave reaches the side of blasting first, and thus the vertical peak particle vibration velocity is far greater than that in the other two directions. With the propagation of wave, attenuation index of longitudinal wave is greater than that of Rayleigh-wave. Border influences particle vibration law, and the attenuation index of peak particle vibration velocity in abrupt change border is greater than that in gradual change border. In addition, the ability of arch structure withstanding blasting load is greater than that of the plane structure.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2009年第10期1339-1343,共5页
Journal of China Coal Society
基金
国家自然科学基金资助项目(50774056)
武汉科技大学科学基金资助项目(080068)
关键词
隧道
爆破
爆破振动
振动速度
tunnel
blasting
blasting vibration
vibration velocity
