全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...
工程力学  2015 

基于精确爆破载荷分析的安全距离判据

DOI: 10.6052/j.issn.1000-4750.2014.03.0248, PP. 123-129

Keywords: 隧道工程,毫秒延时爆破,爆破动力载荷,FLAC3D,安全判据

Full-Text   Cite this paper   Add to My Lib

Abstract:

爆破振动灾害严重威胁着爆破振动场内既有构筑物的安全及稳定。然而,由于毫秒延时爆破的振动载荷表征复杂,若采用简化的三角形或者梯形动力载荷进行分析,与实际的工程情况差异显著。基于对爆破孔内爆破压力变化、炮孔体积扩张、围岩裂隙发展、爆破气体运动等的分析,建立起爆破动力载荷随时间变化的精确数学模型;在远场爆破振动分析时,统一理论下各个爆破孔的动力载荷,其规律满足圣维南定理,因此,可将每分段内各孔的爆破载荷等效为其作用区域上的均布载荷,毫秒延时爆破问题就转化为一个等效边界问题;最后通过有限元数值模拟软件FLAC3D建立三维隧道模型,代入物理力学参数、传播及衰减规律参数以及动力载荷模型,预测峰值速度曲线,与现场实际监测数据进行对比分析,确定数值模拟的准确性,并结合预测的有效应力曲线计算得出爆破安全判据公式。

References

[1]  沈世伟, 许君臣, 代树林, 徐燕. 基于熵值赋权法的节理岩体隧道爆破质量可拓学评价[J]. 土木工程学报, 2013, 46(12): 118―126.
[2]  Shen Shiwei, Xu Junchen, Dai Shulin, Xu Yan. Extenics evaluation of joint rock tunnel blasting quality based on entropy weighting method [J]. China Civil Engineering Journal, 2013, 46(12): 118―126. (in Chinese)
[3]  Ansell A. In situ testing of young shotcrete subjected to vibration from blasting [J]. Tunneling and Underground Space Technology, 2004, 19: 587―593.
[4]  Nateghi R. Prediction of ground vibration level induced by blasting at different rock units [J]. International Journal of Rock Mechanics and Mining Sciences, 2011, 48: 899―908.
[5]  Ozer U. Environmental impacts of ground vibration induced by blasting at different rock units on the Kadikoy-Kartal metro tunnel [J]. Engineering Geology, 2008, 100: 82―90.
[6]  Shi X Z, Lin D N, Chen S R. Blasting vibration induced damage prediction by rough set-based fuzzy-neural network [J]. Explosion and Shock Waves, 2009, 29(4): 401―407.
[7]  Wu C Q, Lu Y, Hao H. Numerical prediction of blast-induced stress wave from large-scale underground explosion [J]. International Journal for Numerical and Analytical Methods in Geomechanics, 2004, 28(1): 93―109.
[8]  Zhu W C, Tang C A. Numerical simulation of Brazilian disk rock failure under static and dynamic loading [J]. International Journal of Rock Mechanics and Mining Sciences, 2006, 43: 236―252.
[9]  Kim S, Jeong W, Jeong D, Seok J. Numerical simulation of blasting at tunnel contour hole in jointed rock mass [J]. Tunneling and Underground Space Technology, 2006, 21: 306―307.
[10]  Jiang L C, Hu L Q, Lai X Y. Investigation on the threshold control of safety blasting vibration velocity for the extraction of complicated orebody under railway [J]. Mining Science and Technology, 2011, 21: 169―174.
[11]  王维玉, 赵拓, 孟艳杰. 爆破地震作用下CFG桩复合地基动力特性的数值模拟[J]. 工程力学, 2012, 29(6): 150―155.
[12]  Wang Weiyu, Zhao Tuo, Meng Yanjie. The numerical analysis on bearing capacity of CFG pile composite foundation under blasting [J]. Engineering Mechanics, 2012, 6(29): 150―155. (in Chinese)
[13]  魏炯, 朱万成, 魏晨慧, 白羽, 李帅. 导向孔对两爆破孔间成缝过程影响的数值模拟[J]. 工程力学, 2013, 30(5): 335―339.
[14]  Wei Jiong, Zhu Wancheng, Wei Chenghui, Bai Yu, Li Shuai. Numerical simulation on contribution of guide-hole to crack coalescence of two boreholes [J]. Engineering Mechanics, 2013, 30(5): 335―339. (in Chinese)
[15]  Hustrulid W A. Blasting principles for open pit mining [M]. Brookfield: A.A. Balkema Publishers, 1999: 48―52.
[16]  Henrych J. The dynamics of explosion and its use [M]. New York: Elsevier Scientific Publishing Company, 1979: 73―74.
[17]  Lu W B, Yang J H, Chen M, Zhou CH B. An equivalent method for blasting vibration simulation [J]. Simulation Modelling Practice and Theory, 2011, 19: 2050―2062.
[18]  Jiang N, Zhou C B. Blasting vibration safety criterion for a tunnel liner structure [J]. Tunneling and Underground Space Technology, 2012, 32: 52―57.
[19]  Li W X. One-dimensional nonsteady flow and shock waves [M]. Beijing: National Defense Industrial Press, 2003: 124―130.
[20]  XaHyKaeB A H. Physical process of rock blasting in mining [M]. Leningrad: Mineral Press, 1974: 41―43.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133