Theoretical analysis of blasting vibration zone considering viscous effect

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (17) : 107-114.

LI Zhiwen 1,2, LI Jianchun 1, HONG Shengnan 1,2, LI Haibo 1, ZHANG Guokai 1,2,3

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Abstract

Due to geometric diffusion of wave fronts and absorption of medium,amplitude and frequency of blasting seismic waves have a series of changes in their propagation process. In order to study generation and propagation laws of blasting seismic waves,rock mass was considered as a viscoelastic medium,blasting loads were equivalently exerted on the boundary of the vibration zone,the integral solution to the problem was obtained in frequency domain. The numerical calculation and parametric analysis were done for the integral solution. The results showed that the shorter the rise time of blasting loads,the larger the boundary vibration amplitude of the vibration zone; the longer the duration for blast loads lasting,the longer the duration for the boundary vibration lasting,but the vibration amplitude is not influenced; under the action of the same blasting loads,the smaller the medium’s elastic modulus and viscosity coefficient,the larger the boundary vibration amplitude; geometric decay of blasting seismic waves is divided into near-field attenuation and far-field attenuation,the decay rate of near field is obviously larger than that of far field; with increase in the ratio of viscous coefficient to elastic modulus,medium absorbs blasting seismic waves more obviously; with increase in the propagation distance of blasting seismic waves,their higher frequency components decrease relative to their lower frequency components,the larger the viscosity coefficient,the faster the decrease speed.

Key words

viscoelastic medium / blasting vibration / vibration propagation law / vibration amplitude / blast loading

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LI Zhiwen 1,2, LI Jianchun 1, HONG Shengnan 1,2, LI Haibo 1, ZHANG Guokai 1,2,3. Theoretical analysis of blasting vibration zone considering viscous effect[J]. Journal of Vibration and Shock, 2018, 37(17): 107-114

References

[1] LANGEFORS U, KIHLSTRÖM B. The modern technique of rock blasting[M]. Almquist and Wiksell, 1963.
[2] 王文龙. 钻眼爆破[M]. 煤炭工业出版社, 1984.
[3] 张永哲. 爆破地震波传播特性研究[J]. 爆破, 2000(S1):6-10.
ZHANG Yong-zhe. Study on propagation characteristics of explosive seixmic wave[J]. Blasting, 2000(S1):6-10.
[4] 龙源, 冯长根, 徐全军,等. 爆破地震波在岩石介质中传播特性与数值计算研究[J]. 工程爆破, 2000, 6(3):1-7.
LONG Yuan,FENG Chang-gen,XU Quan-jun,et al. Study on propagation characteristics of blasting seismic waves in a rock medium and numerical calculation[J]. Engineering Blasting, 2000, 6(3):1-7.
[5] SINGH P K. Blast vibration damage to underground coal mines from adjacent open-pit blasting[J]. International Journal of Rock Mechanics & Mining Sciences, 2002, 39(8):959-973.
[6] 李重情, 穆朝民, 石必明. 变埋深条件下混凝土中爆炸应力传播规律的研究[J]. 振动与冲击, 2017, 36(6): 140-145.
LI Zhong-qing, MU Chao-min, SHI Bi-ming. Investigate on shock stress propagation in concrete at different depths under blasting [J].Journal of Vibration and Shock, 2017, 36(6): 140-145.
[7] 赵明生, 梁开水, 李本伟. 段药量对爆破振动信号时频特性的影响研究[J]. 振动与冲击, 2012, 31(7):85-88.
ZHAO Ming-sheng,LIANG Kai-shui, LI Ben-wei. Influence of deck charge on time-frequency characteristics of a blasting vibration signal[J]. Journal of Vibration & Shock, 2012, 31(7):85-88.
[8] 赵坚, 陈寿根, 蔡军刚,等. 用UDEC模拟爆炸波在节理岩体中的传播[J]. 中国矿业大学学报, 2002, 31(2):111-115.
ZHAO Jian, CHEN Shou-gen, CAI Jun-gang, et al. Simulation of blast wave propagation in jointed rock mass using UDEC[J]. Zhongguo Kuangye Daxue Xuebao/journal of China University of Mining & Technology, 2002, 31(2):111-115.
[9] 夏祥, 李俊如, 李海波,等. 爆破荷载作用下岩体振动特征的数值模拟[J]. 岩土力学, 2005, 26(1):50-56.
XIA Xiang,LI Jun-ru, LI Hai-bo,et al. Udec modeling of vibration characteristics of jointed rock mass under explosion[J]. Rock & Soil Mechanics, 2005, 26(1):50-56..
[10] 李鹏, 卢文波, 吴新霞,等. 爆源因素对岩体开挖爆破振动频谱特性的影响研究[J]. 长江科学院院报, 2014, 31(11):182-188.
LI Peng ,LU Wen-bo ,WU Xin-xia,et al. Influence of blast source parameters on spectral characteristics of vibration induced by blast of rock mass[J]. Journal of Yangtze River Scientific Research Institute, 2014, 31(11):182-188.
[11] 周俊汝, 卢文波, 张乐,等. 爆破地震波传播过程的振动频率衰减规律研究[J]. 岩石力学与工程学报, 2014, 33(11):2171-2178.
ZHOU Jun-ru,LU Wen-bo,ZHANG Le,et al. Attenuation of vibration frequency during propagation of blasting seismic wave. Chinese Journal of Rock Mechanics & Engineering, 2014, 33(11):2171-2178.
[12] LI J C, MA G W, ZHOU Y X. Analytical study of underground explosion-induced ground motion[J]. Rock Mechanics & Rock Engineering, 2012, 45(6):1037-1046.
[13] LI J C, LI H B, MA G W, et al. Assessment of underground tunnel stability to adjacent tunnel explosion[J]. Tunnelling & Underground Space Technology Incorporating Trenchless Technology Research, 2013, 35(35):227-234.
[14] 魏晓林, 陈颖尧, 郑炳旭. 浅眼爆破地震波传播规律[J]. 工程爆破, 2002, 8(4):56-61.
WEI Xiao-lin, CHEN Ying-yao, ZHENG Bing-xu. On the principle of propagation of seismic wave from short-hole blasting[J]. Engineering Blasting, 2002, 8(4):56-61..
[15] 王永庆, 魏晓林, 夏柏如,等. 爆破振动频率预测研究[J]. 爆破, 2007, 24(4):17-20.
WANG Yong-qing, WEI Xiao-lin, XIA Bo-ru et al. Study on forecast of blasting seismotic frequency[J]. Blasting, 2007, 24(4):17-20.
[16] 卢文波, 张乐, 周俊汝,等. 爆破振动频率衰减机制和衰减规律的理论分析[J]. 爆破, 2013, 30(2):1-6.
LU Wen-bo, ZHANG Le, ZHOU Jun-ru,et al. Theoretical analysis on decay mechanism and law of blasting vibration frequency[J]. Blasting, 2013, 30(2):1-6.
[17] 杨建华, 卢文波, 陈明,等. 岩石爆破开挖诱发振动的等效模拟方法[J]. 爆炸与冲击, 2012, 32(2):157-163.
YANG Jian-hua,LU Wen-bo,CHEN Ming,et al. An equivalent simulation method for blasting vibration of surrounding rock[J]. Explosion & Shock Waves, 2012, 32:157-163.
[18] 牛滨华. 半空间介质与地震波传播[M]. 石油工业出版社, 2002.
[19] 牛滨华. 黏弹性介质与地震波传播[M]. 地质出版社, 2007.
[20] 逄焕东, 陈士海. 弹性介质中爆破地震波传播的分区变化规律研究[J]. 振动与冲击, 2009, 28(3):105-107.
PANG Huan-dong, CHEN Shi-hai. Variation law of blasting seismic wave's propagation in elastic media[J]. Journal of Vibration & Shock, 2009, 28(3):105-107.