爆破震动频率对边坡稳定性的影响
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摘要
建立爆破地震波作用下的边坡震动有限元模型,利用模态分析、谐响应分析得到边坡固有频率,利用瞬态动力学分析方法,得到不同爆破频率作用下的边坡动力响应。最后分析预测适合该地区边坡的爆破频率。研究结果表明:通过调整爆破规模,选择合适的爆破主频,避免与边坡固有频率产生共振,可提高边坡稳定性。
A slope finite element model with the blasting seismic waves was set up.Using modal analysis and harmonic response analysis,the natural frequency of the slope was obtained.The slope dynamic response at different blasting frequencies was obtained through transient dynamics analysis.Finally,the reasonable blasting frequency was forecasted for the slope.The results show that by adjusting the blasting scale and choosing appropriate blasting frequency to avoid producing resonance with the slope,the stability of the slope can be improved.
A slope finite element model with the blasting seismic waves was set up.Using modal analysis and harmonic response analysis,the natural frequency of the slope was obtained.The slope dynamic response at different blasting frequencies was obtained through transient dynamics analysis.Finally,the reasonable blasting frequency was forecasted for the slope.The results show that by adjusting the blasting scale and choosing appropriate blasting frequency to avoid producing resonance with the slope,the stability of the slope can be improved.
引文
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[2]刘佳,鲁海,崔颖辉,等.边坡稳定性的动力影响因素分析[J].北方工业大学学报,2009,21(1):90-94.LIU Jia,LU Hai,CUI Ying-hui,et al.Research on stability of slopes under dynamic forces[J].Journal of North China University of Technology,2009,21(1):90-94.
[3]舒大强,何蕴龙,董振华.岩质高边坡开挖爆破震动荷载及其对边坡稳定性影响的研究[J].工程爆破,1996,2(4):39-43.SHU Da-qiang,HE Yun-long,DONG Zhen-hua.Research on vibration load from excavation blasting and its influence on stability of rock high-slope[J].Engineering Blasting,1996,2(4):39-43.
[4]谭文辉,乔兰.爆破震动对公路边坡稳定性影响的数值模拟[J].岩石力学与工程学报,2005,24(增1):4837-4842.TAN Wen-hui,QIAO Lan.Numerical simulation of blasting vibration on highway-slope stability[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(Supp1):4837-4842.
[5]Ling H I,Cheng A H D.Rock sliding induced by seismic force[J].International Journal of Rock Mechanics and Mining Sciences,1997,34(6):1021-1029.
[6]刘汉龙,费康,高玉峰.边坡地震稳定性时程分析方法[J].岩土力学,2003,24(4):553-560.LIU Han-long,FEI Kang,GAO Yu-feng.Time history analysis method of slope seismic stability[J].Rock and Soil Mechanics,2003,24(4):553-560.
[7]张建海,范景伟,何江达.用刚体弹簧元求解边坡、坝基动力安全系数[J].岩石力学与工程学报,1999,18(4):387-391.ZHANG Jian-ha,FAN Jing-wei,HE Jiang-da.Dynamic safety evaluation of slopes or dam foundation using rigid body-spring element method[J].Chinese Journal of Rock Mechanics and Engineering,1999,18(4):387-391.
[8]薄景山,徐国栋,景立平.土边坡地震反应及其动力稳定性分析[J].地震工程与工程振动,2001,21(2):117-120.BO Jing-shan,XU Guo-dong,JING Li-ping.Seismic response and dynamic stability analysis of soil slopes[J].Earthquake Engineering and Engineering Vibration,2001,21(2):116-120.
[9]陈玲玲,陈敏中,钱胜国.岩质陡高边坡地震动力稳定分析[J].长江科学院院报,2004,21(1):33-35.CHEN Ling-ling,CHEN Min-zhong,QIAN Sheng-guo.Stability analysis of high-steep rocky slope under earthquake loads[J].Journal of Yangtze River Scientific Research Institute,2004,21(1):33-35.
[10]宋光明,史秀志,张劲松,等.利用爆破振动观测求解边坡自振频率[J].金属矿山,2001(3):4-6.SONG Guang-ming,SHI Xiu-zhi,ZHANG Jin-song,et al.Working out the natural frequency of slope on the basis of blast vibration monitoring[J].Metal Mine,2001(3):4-6.
[11]秋仁东,石玉成,付长华.高边坡在水平动荷载作用下的动力响应规律研究[J].世界地震工程,2007,23(2):131-138.QIU Ren-dong,SHI Yu-cheng,FU Chang-hua.General laws of dynamic responses of the high slope under horizontal dynamic input[J].World Earthquake Engineering,2007,23(2):131-138.
[12]徐继言,刘红帅,高山.均质岩石边坡自振周期及其估算方法研究[J].世界地震工程,2009,25(1):64-69.XU Ji-yan,LIU Hong-shuai,GAO Shan.Study on natural period of homogeneous rock slope and its estimation method[J].World Earthquake Engineering,2009,25(1):64-69.
[13]Mucciarelli M,Masi A,Gallipoli M R,et al.Analysis of RC building dynamic response and soil-building resonance based on data recorded during a damaging earthquake[J].Bulletin of the Seismological Society of America,2004,94(5):1943-1953.
[14]刘红帅,薄景山,耿冬青,等.岩质滑坡稳定性有限元分析[J].岩土力学,2004,25(11):1786-1790.LIU Hong-shuai,BO Jing-shan,GENG Dong-qing,et al.Rock landslide stability analysis by finite element method[J].Rock and Soil Mechanics,2004,25(11):1786-1790.
[15]许红涛,卢文波,周创兵,等.基于时程分析的岩质高边坡开挖爆破动力稳定性计算方法[J].岩石力学与工程学报,2006,25(11):2213-2219.XU Hong-tao,LU Wen-bo,ZHOU Chuang-bing,et al.Time history analysis method for evaluating dynamic stability of high rock slope under excavation blasting[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(11):2213-2219.
[16]祁生文,伍法权,刘春玲,等.地震边坡稳定性的工程地质分析[J].岩石力学与工程学报,2004,23(16):2792-2797.QI Sheng-wen,WU Fa-quan,LIU Chun-ling,et a1.Engineering geology analysis on stability of slope under earthquake[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(16):2792-2797.
[17]张立国,龚敏,于亚伦.爆破振动频率预测及其回归分析[J].辽宁工程技术大学学报,2005,24(2):187-189.ZHANG Li-guo,GONG Min,YU Ya-lun.Forecast and regression analysis of blasting vibration frequency[J].Journal of Liaoning Technical University,2005,24(2):187-189.
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