爆破开挖对路堑高边坡稳定性影响分析
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摘要
岩质高边坡是山区公路建设中常见的一类边坡工程,其动力稳定性分析一直是岩土工程密切关注的问题。在分析路堑开挖爆破振动及其效应的基础上,探讨边坡动力稳定性的分析方法和安全评价标准;结合延庆—龙庆峡路改建工程,建立爆炸荷载作用下路堑边坡动力响应的有限元分析模型,探讨不同爆破方法和不同设计边坡条件下,下台阶爆破开挖对上台阶边坡稳定性的影响。研究结果表明,采用缓冲爆破技术,同时设计采用适宜的边坡坡度,可有效降低边坡质点振动速度,控制爆破开挖对路堑边坡稳定性的影响。
High rock slope is a common type of slope in mountainous areas during highway construction,and the issue of its stability has been closely followed by geotechnical research scholars.Based on research of the blasting vibration and its effect during the excavation of cutting slope,the analytical methods and the evaluation criteria of the high rock slope's dynamic stability were discussed.Taking Yanqing—Longqingxia road reconstruction project as the background,a finite element analysis model of the dynamic response of high rock cutting slope under the load of explosion was established and the explosion's influence on the dynamic stability of upper bench slope during the excavation of lower bench slope with different blasting design parameters and different slope design types was discussed.The results of the detailed research indicated that the particle vibration velocity of slope strikingly decreased when using cushion blasting technology and suitable design degree of slope,and the influence of blasting on the cutting slope stability was effectively controlled.
High rock slope is a common type of slope in mountainous areas during highway construction,and the issue of its stability has been closely followed by geotechnical research scholars.Based on research of the blasting vibration and its effect during the excavation of cutting slope,the analytical methods and the evaluation criteria of the high rock slope's dynamic stability were discussed.Taking Yanqing—Longqingxia road reconstruction project as the background,a finite element analysis model of the dynamic response of high rock cutting slope under the load of explosion was established and the explosion's influence on the dynamic stability of upper bench slope during the excavation of lower bench slope with different blasting design parameters and different slope design types was discussed.The results of the detailed research indicated that the particle vibration velocity of slope strikingly decreased when using cushion blasting technology and suitable design degree of slope,and the influence of blasting on the cutting slope stability was effectively controlled.
引文
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[15]陈建平,高文学,陶连金.爆破工程地质控制论[J].工程地质学报,2006,15(5):616-619.(CHEN Jianping,GAO Wenxue,TAO Lianjin.Theory of rock blasting control in geology engineering[J].Journal of Engineering Geology,2006,15(5):616-619.(in Chinese))
[2]林士炎,李长洪,乔兰,等.爆破震动对高速路边坡影响的数值模拟[J].北京科技大学学报,2003,25(6):507-509.(LIN Shiyan,LI Changhong,QIAO Lan,et al.Numerical simulation on the influenceof blasting vibration on the freeway slope[J].Journal of University of Science and Technology of Beijing,2003,25(6):507-509.(in Chinese))
[3]祁生文,伍法权.边坡动力响应规律研究[J].中国科学(E辑),2003,33(增):28-40.(QI Shengwen,WU Faquan.Research of rock slope dynamic response[J].Science in China(Technological Science),2003,33(Supp.):28-40.(in Chinese))
[4]刘运通,高文学.现代公路工程爆破[M].北京:人民交通出版社,2005.(LIU Yuntong,GAO Wenxue.Modern highway engineering blasting[M].Beijing:China Communications Press,2005.(in Chinese))
[5]张建海,范景伟,何江达.用刚体弹簧元法求解边坡、坝基动力安全系数[J].岩石力学与工程学报,1999,18(4):387-391.(ZHANG Jianhai,FAN Jingwei,HE Jiangda.Dynamic safety evaluation of slopes or dam foundations using rigid body spring element method[J].Chinese Journal of Rock Mechanics and Engineering,1999,18(4):387-391.(in Chinese))
[6]张伯艳,陈厚群,杜修力,等.拱坝坝肩抗震稳定分析[J].水利学报,2000,(11):55-59.(ZHANG Boyan,CHEN Houqun,DU Xiuli,et al.Arch dam abutment asiesmatic stability analysis[J].Journal of Hydraulic Engineering,2000,(11):55-59.(in Chinese))
[7]苏超,李俊宏,任青文.有限单元法在高拱坝坝肩动力稳定分析中的应用[J].河海大学学报(自然科学版),2003,31(2):144-147.(SU Chao,LI Junhong,REN Qingwen.FEM-based dynamic stability analysis of abutment for high arch dams[J].Journal of Hohai University(Natural Science),2003,31(2):144-147.(in Chinese))
[8]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):553-556.(LIU Hanlong,FEI Kang,GAO Yufeng.Time-history analysis method of slope seismic stability[J].Rock and Soil Mechanics,2003,24(4):553-556.(in Chinese))
[9]薄景山.三峡重庆库区区域滑坡灾害的综合研究报告[R].哈尔滨:中国地震局工程力学研究所,2003.(BO Jingshan.Research report of Three Gorges land slip in Chongqing area[R].Harbin:Institute of Engineering Mechanics,China Earthquake Administration,2003.(in Chinese))
[10]张志毅,王中黔.交通土建工程爆破工程师手册[M].北京:人民交通出版社,2002.(ZHANG Zhiyi,WANG Zhongqian.Blasting engineer handbook of traffic and construction engineering[M].Beijing:China Communications Press,2002.(in Chinese))
[11]国道通公路设计研究院.延龙路延长线改建工程设计资料[R].北京:国道通公路设计研究院,2007.(Guodaotong Highway Design Institute.Yanlong road elongation line conversion works design data[R].Beijing:Guodaotong Highway Design Institute,2007.(in Chinese))
[12]许红涛,卢文波,周小恒.爆破震动场动力有限元模拟中爆破荷载的等效施加方法[J].武汉大学学报(工学版),2008,41(1):67-71,103.(XU Hongtao,LU Wenbo,ZHOU Xiaoheng.An equivalent approach for acting blasting load in dynamic finite element simulation of blasting vibration[J].Engineering Journal of Wuhan University,2008,41(1):67-71,103.(in Chinese))
[13]陈明,卢文波,吴亮,等.小湾水电站岩石高边坡爆破振动速度安全阈值研究[J].岩石力学与工程学报,2007,26(1):51-56.(CHEN Ming,LU Wenbo,WU Liang,et al.Safety threshold of blasting vibration velocity to high rock slope of Xiaowan hydropower station[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(1):51-56.(in Chinese))
[14]SWOBODA G,AENZ G.Practical considerations of blasting loading using numerical modeling[C]//Proceedings of the6th Int.Conf.Numer.Methods Geomech.Insbrush:[s.n.],1988:1681-1688.
[15]陈建平,高文学,陶连金.爆破工程地质控制论[J].工程地质学报,2006,15(5):616-619.(CHEN Jianping,GAO Wenxue,TAO Lianjin.Theory of rock blasting control in geology engineering[J].Journal of Engineering Geology,2006,15(5):616-619.(in Chinese))
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