【摘要】 结合在建的贵昆线六盘水至沾益段增建二线扒挪块隧道开挖工程,采用动力有限元程序建立了三维模型,并对贵昆线狮子口隧道混凝土衬砌的应力分布情况进行了研究。结果表明,在整个考察范围内,拱顶和底板单元的主要拉伸应力为水平方向,说明垂直振速不能完全代表围岩的受力状况。在实际工程中,不仅要控制好爆破振动速度,而且对围岩的受力状况也要进行分析。更多还原

【Abstract】 Based on an actual tunnel excavation project,a three-dimensional finite element model of tunnel excavation is set up,and stress distribution on the existing adjacent tunnel concrete lining is analyzed.The result shows that,in the whole range of investigation,the main tensile stress in the tunnel vault crown and bottom is in the horizontal direction,which proves that the vertical peak particle vibration cannot totally represent the stress state of rock.In the actual project,the blasting peak particle vibration should be controlled,and the stress state of rock should be analyzed as well.更多还原