摘要
结合在建的贵昆线六盘水至沾益段增建Ⅱ线扒挪块隧道开挖工程,采用动力有限元程序建立了3维模型,对贵昆线狮子口隧道混凝土衬砌的质点振动速度以及应力分布情况进行了计算。计算结果表明,在整个考察范围内,垂直方向振速峰值比其他2个方向上的振速峰值大,但在拱顶以及底板单元的主要拉伸应力为水平方向,说明垂直振速并不能完全代表围岩的受力状况。在实际工程中,不仅要控制爆破振动速度,而且对围岩的受力状况也要进行分析。计算最大振速为4.94cm/s,小于工程要求的5.00cm/s;拱顶最大拉伸应力为0.54MPa,既有隧道混凝土衬砌没有受到破坏。
Based on an actual tunnel excavation project,the three-dimensional finite element model of tunnel excavation was set up,and the particle vibration and stress distribution were analyzed at the existing adjacent tunnel concrete lining.The calculation result shows that in the whole range of investigation,the vertical peak particle vibration is bigger than those in the other two directions,but the main tensile stress in the tunnel vault crown and bottom is in the horizontal direction,which proves that the vertical peak particle vibration can not totally represent the stress state of rock.In actual projects,the blasting peak particle vibration should be controlled,and the stress state of rock should be analyzed as well.The maximum peak particle vibration calculated is 4.94cm/s,which is smaller than 5.00cm/s required in projects;the maximum tensile stress in the tunnel vault crown is 0.54MPa,so the tunnel concrete line is not affected.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2010年第5期456-462,共7页
Explosion and Shock Waves
基金
国家自然科学基金项目(50774056
51004079)
湖北省自然科学基金项目(B20091103)~~
关键词
爆炸力学
爆破振动
爆破
隧道
mechanics of explosion
blasting vibration
blasting
tunnel
作者简介
钟冬望（1963-），男，博士，教授。
