硬岩浅埋中等断面隧道爆破的数值模拟与安全性分析
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摘要
从经济和工艺技术方面考虑,在硬岩地区进行地铁隧道的开挖,最适合的方法就是钻爆施工方法。但是钻爆法施工产生的爆破地震效应会对地表建筑物产生较大的危害,尤其是紧贴既有建筑物的浅埋中等断面隧道。控制爆破的地震效应,就要对爆破方法进行地震效应的研究。文章采用显示动力学分析有限元软件ANSYS/LS-DYNA3D对传统乳化炸药爆破方式和引进的金属膨胀剂爆破方式进行数值模拟,利用计算出爆破振动速度的时程和爆破破碎围岩的效果进行对比分析,并评价2种爆破方式的优缺点。
In view of the economy and technology, the most suitable method of subway tunnel excavation in the hard rock area is drilling blasting construction. However, the blasting seismic effect caused by the drilling and blasting construction will do great harm to the surface buildings, especially the shallow buried medium cross section tunnels close to the existing buildings. To control the seismic effect of blasting, it is necessary to study the seismic effect of the blasting method. In this paper, the finite element software ANSYS/LS-DYNA3 D is used to numerically simulate the traditional emulsion explosive blasting method and the introduced metal bulking agent blasting method. The time-history of the blasting vibration velocity and the effect of rock blasting are compared and analyzed, and the advantages and disadvantages of the two blasting methods are evaluated.
In view of the economy and technology, the most suitable method of subway tunnel excavation in the hard rock area is drilling blasting construction. However, the blasting seismic effect caused by the drilling and blasting construction will do great harm to the surface buildings, especially the shallow buried medium cross section tunnels close to the existing buildings. To control the seismic effect of blasting, it is necessary to study the seismic effect of the blasting method. In this paper, the finite element software ANSYS/LS-DYNA3 D is used to numerically simulate the traditional emulsion explosive blasting method and the introduced metal bulking agent blasting method. The time-history of the blasting vibration velocity and the effect of rock blasting are compared and analyzed, and the advantages and disadvantages of the two blasting methods are evaluated.
引文
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[2] MA Y D,CAO J B.MHD and kinetic analysis of flow bursts in the Earth’s plasma sheet[J].Science China(Technological Sciences),2014,57(1):55-66.
[3] 郭永葆,薛红云,雷丽平.离子切割工艺特征及其污染治理[J].环境工程,2015,33(增刊1):448-449,508.
[4] 王海亮.工程爆破[M].北京:中国铁道出版社,2008:12-110.
[5] 白金泽.LS-DYNA3D理论基础与实例分析[M].北京:科学出版社,2005:74-100.
[6] 尚晓江,苏建宇.ANSYS/LS-DYNA动力分析方法与工程实例[M].北京:中国水利水电出版社,2006:257-274.
[7] 白瑞雪,钱德玲,韩青青,等.连跨箱型隧道紧贴下穿地下建筑施工方案研究[J].合肥工业大学学报(自然科学版),2013,36(7):836-840.
[8] 汪旭光,于亚伦.关于爆破震动安全判据的几个问题[J].工程爆破,2001,7(2):88-92.
[9] 许红涛,卢文波.几中爆破震动安全判据[J].爆破,2002,19(1):8-10.
[10] 张振,孟益平,李和平,等.下穿文保建筑隧道爆破的数值模拟与安全分析[J].合肥工业大学学报(自然科学版),2015,37(9):1112-1115.