隧道明挖段拉槽爆破时既有隧道结构动力响应特性

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振动与冲击 ›› 2015, Vol. 34 ›› Issue (19) : 203-207.

论文

邹新宽 1, 张继春1, 潘强1, 葛竟辉2

作者信息 +

Dynamic response characteristics of existing tunnel structure induced by cutting blast utilized in open excavation

Zou Xin-kuan1, Zhang Jichun1, Pan Qiang1,Ge Jinghui2

Author information +

文章历史 +

摘要

研究确定拉槽爆破开挖对既有隧道结构的影响特征是制定正确合理控制爆破方案的前提。为此，以雅山隧道明挖段岩体拉槽爆破开挖为背景，利用数值模拟和现场爆破试验研究浅孔拉槽爆破时下部既有隧道结构的振动特性。数值模拟结果表明：在既有隧道上部进行浅孔拉槽爆破时，既有隧道衬砌各质点的竖向振动均明显较水平振动强烈，对爆破振动控制起主要作用；距爆源较近一侧隧道拱肩衬砌的质点竖向振速峰值为最大，且其随单段起爆药量增加而显著增大；既有隧道衬砌上的竖向质点振速峰值与Von-Mises应力间呈明显线性关系，当衬砌振速阈值设定为4.5cm/s时，既有隧道衬砌的动力安全系数为2.0。现场试验结果证明了利用数值模拟方法可有效指导拉槽爆破开挖和爆破振动测试方案的制定，并据实测振动数据回归分析得到了可优化设计拉槽爆破单段起爆药量的计算公式。

Abstract

To investigate and determine the effect of open excavation blasting on the dynamic characteristics of existing tunnel structure is the prerequisite for designing a scientific and reasonable controlled cutting blast scheme. Thus, in combination with the utilization of cutting blast in the open excavation segment of Yalimak tunnel, which adjacent to the top of the existing small-distance tunnel, the vibration characteristics of the existing tunnel structure during blasting were investigated by numerical simulation and field tests. The numerical simulation results indicate that the vertical PPV( Particle Peak Vibration ) on the lining of existing tunnel is higher than the horizontal PPV and plays a major role in blasting vibration control as open excavation blasting is performed. The vertical PPV on the spandrel of right existing tunnel closer to the blasting source is highest and increases obviously with the maximum charge per delay increasing. Von-Mises stress on the existing tunnel approximately follows a linear relationship with the vertical PPV, the dynamic safety factor of existing tunnel structure is 2.0 when the control value of safety vibration velocity is set to 4.5cm/s. According to the field tests results numerical simulation has been proved correct and can be utilized to guide the design of open excavation cutting blast as well as vibration measurement effectively. Moreover, the predication formula, which could be used to determine and further optimize the maximum charge per delay, has been obtained by means of regression analysis.

导出引用

邹新宽 1, 张继春1, 潘强1, 葛竟辉2. 隧道明挖段拉槽爆破时既有隧道结构动力响应特性[J]. 振动与冲击, 2015, 34(19): 203-207

Zou Xin-kuan1, Zhang Jichun1, Pan Qiang1,Ge Jinghui2. Dynamic response characteristics of existing tunnel structure induced by cutting blast utilized in open excavation[J]. Journal of Vibration and Shock, 2015, 34(19): 203-207

参考文献

[1] 张继春，曹孝君，郑爽英，等. 浅埋隧道掘进爆破的地表震动效应试验研究[J]. 岩石力学与工程学报，2005,24(22):4158－4163.
ZHANG Jichun, CAO Xiaojun, ZHENG Shuangyin, et al. Experimental study on vibration effects of ground due to shallow tunnel blasting[J]. Chinese Journal of Rock Mechanics and Engineering, 2005,24(22):4158－4163.
[2] 叶培旭，杨新安，凌保林，等. 近距离交叉隧洞爆破对既有隧道的振动影响[J]. 岩土力学，2011,32(2):537－541.
YE Peixu, YANG Xinan, LING Baolin, et al. Vibration effects on existing tunnel induced by blasting of an adjacent cross tunnel[J]. Rock and Soil Mechanics, 2011,32(2):537－541.
[3] R. Resende , L. Lamas, J. Lemos, et al. Stress wave propagation test and numerical modelling of an underground complex[J]. International Journal of Rock Mechanics & Mining Sciences, 2014,72:26－36.
[4] 管晓明，傅洪贤，王梦恕. 隧道近距下穿山坡楼房爆破振动测试研究[J]. 岩土力学，2014,35(7):1995－2003.
GUAN Xiaoming，FU Hongxian，WANG Mengshu. Blasting vibration characteristics monitoring of tunnel under－passing hillside buildings in short－distance[J]. Rock and Soil Mechanics, 2014,35(7):1995－2003.
[5] 杨年华, 张志毅. 隧道爆破振动控制技术研究[J]. 铁道工程学报, 2010, (1): 82－86.
YANG Nian－hua, ZHANG Zhi－yi. Research on the control technology for tunnel blasting vibration[J]. Journal of Railway Engineering Society, 2010, (1): 82－86.
[6] 朱正国，孙明路，朱永全，等. 超小净距隧道爆破振动现场监测及动力响应分析研究[J]. 岩土力学，2012,33(12):3747－3753.
ZHU Zhengguo , SUN Minglu , ZHU Yongquan , et al. Field monitoring on blasting vibration and dynamic response of ultra－small spacing tunnels[J]. Rock and Soil Mechanics, 2012,33(12):3747－3753.
[7] 曹孝君，张继春，吕和林，等. 浅埋隧道掘进爆破地表震动效应数值模拟[J]. 西南交通大学学报，2006, 41(6):680－684.
CAO Xiaojun, ZHANG Jichun, LV Helin, et al. Numerical simulation of ground vibration effects in shallow tunneling blasting [J]. Journal of Southwest Jiaotong University, 2006, 41(6): 680－684.
[8] 姚强，杨兴国，陈兴泽，等. 大型地下厂房爆破振动动力响应数值模拟[J]. 振动与冲击，2014,33(6):66－70.
YAO Qiang, YANG Xingguo, CHEN Xingze, et al. Numerical simulation of dynamic response of large underground powerhouse subjected to blasting vibration[J]. Journal of Vibration and Shock, 2014, 33(6):66－70.
[9] 汪波，何川，夏炜洋. 爆破施工新建地铁隧道与既有运营地铁的相互动力响应研究[J]. 中国铁道科学，2011,32(5):64－70.
WANG Bo, HE Chuan, XIA Weiyang. Study on the interactive dynamic response between the New－Built tunnel by blasting construction and the existing operation subway tunnel[J]. China Railway Science, 2011,32(5):64－70.
[10] 蒋楠，周传波，罗钢，等. 铁路隧道混凝土衬砌爆破振动安全判据[J].中南大学学报（自然科学版），43(7):2746－2750.
JIANG Nan , ZHOU Chuanbo , LUO Gang , et al. Blasting vibration safety criterion of railway tunnel concrete lining[J]. Journal of Central South University (Science and Technology), 43(7):2746－2750.
[11] GB 6722—2003, 爆破安全规程[S].
GB 6722—2003, Safety regulations for blasting[S].
[12] JTJ 004－89, 公路工程抗震设计规范[S].
JTJ004－89, Specification for railway tunnel design TB10003－2005[S].
[13] JTGT D70—2010, 公路隧道设计规范[S].
JTGT D70—2010, Code for Design of Road Tunnel[S].