基于FLAC~(3D)对爆破振动下某土坝的安全振速预测
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摘要
在大量现场爆破振动监测的基础上,对速度信号进行分析,近似得到了坝体的黏滞阻尼比,基于坝体动力响应特征通过FLAC~(3D)建立了某土石坝的2维模型.基于土体力学参数计算简化得到了坝基瑞利波分布函数,确定了使坝体发生最大响应的振动信号主频为2.00Hz,通过加大最不利地震波振幅,计算得到使坝体破坏的速度阈值为16cm/s,以此阈值作为土坝安全振速,可有效保证坝体的结构安全.
Based on a large amount of on-site blasting vibration monitoring and signal analysis,the approximate viscous damping ratio of the earth dam was obtained,and the quasi-twodimensional model of an earth dam was established based on the dynamic response characteristics of the dam by FLAC~(3D).The Rayleigh wave distribution of the dam foundation was obtained based on the calculation and simplification of soil mechanical parameters,and the main frequency of the dam body was determined.The frequency of the most unfavorable seismic waves was 2.00 Hz.The velocity threshold of dam damage was 16 cm/s by increasing the amplitude of the worst seismic waves,and the threshold was taken as the safe vibration velocity of the dam,which effectively guaranteed the safety of the dam.In this paper,dam vibration speed was predicted by FLAC~(3D),which can be referred to and used by production and scientific research units.
Based on a large amount of on-site blasting vibration monitoring and signal analysis,the approximate viscous damping ratio of the earth dam was obtained,and the quasi-twodimensional model of an earth dam was established based on the dynamic response characteristics of the dam by FLAC~(3D).The Rayleigh wave distribution of the dam foundation was obtained based on the calculation and simplification of soil mechanical parameters,and the main frequency of the dam body was determined.The frequency of the most unfavorable seismic waves was 2.00 Hz.The velocity threshold of dam damage was 16 cm/s by increasing the amplitude of the worst seismic waves,and the threshold was taken as the safe vibration velocity of the dam,which effectively guaranteed the safety of the dam.In this paper,dam vibration speed was predicted by FLAC~(3D),which can be referred to and used by production and scientific research units.
引文
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[11]陈庆凯,李贵臣,李克民.某露天煤矿高台阶抛掷爆破地震效应监测与分析[J].爆破器材,2008,37(6):30-33.Chen Qingkai,Li Guichen,Li Kemin.Monitor and analysis on explosive seismic effect of high-bench cast blast of surface coal mine[J].Explosive Materials,2008,37(6):30-33.(in Chinese)
[2]言志信,吴德伦,王漪,等.地震效应及安全研究[J].岩土力学,2002,23(2):201-203.Yan Zhixin,Wu Delun,Wang Yi,et al.The study of blast vibration effect and safety[J].Rock and Soil Mechanics,2002,23(2):202-204.(in Chinese)
[3]刘春玲,祁生文,童立强,等.利用FLAC3D分析某边坡的稳定性[J].岩石力学与工程学报,2004,23(16):2730-2733.Liu Chunling,Qi Shengwen,Tong Liqiang,et al.Stability analysis of slope under earthquake with FLAC3D[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(16):2730-2733.(in Chinese)
[4]尹贤刚,李庶林,唐海燕,等.厂坝铅锌矿岩石物理力学性质测试研究[J].矿业研究与开发,2003,23(5):12-14.Yin Xiangang,Li Shulin,Tang Haiyan,et al.The tests and studies of physical mechanical properties of the rocks from Changba lead-zinc mine[J].Mining Research and Development,2003,23(5):12-14.(in Chinese)
[5]霍永基,费骥鸣,王湘钧,等.溢洪道开挖爆破对土坝安全影响研究[C]∥水利水电科学研究院科学研究论文集第16集.北京:水利电力出版社,1984:192-203.Huo Yongji,Fei Jiming,Wang Xiangjun,et al.Study on safety influence of spill way excavation explosion to earth dam[C]∥Proceedings of the 16th China Institute of Water Resources and Hydropower Research.Beijing:China Water and Power Press,1984:192-203.(in Chinese)
[6]邓成发,许昌,葛国昌.大坝爆破振动响应评估分析[J].长江科学院院报,2012,29(4):26-29,39.Deng Chengfa,Xu Chang,Ge Guochang.Modal analysis and wavelet transform in evaluating dam vibration response caused by blasting[J].Journal of Yangtze River Scientific Research Institute,2012,29(4):26-29,39.(in Chinese)
[7]杨伟俊.近区爆破对土石坝安全影响分析[J].水利与建筑工程学报,2012,10(3):178-181.Yang Weijun.Impact analysis of blasting nearby on safety of earth-rock dam[J].Journal of Water Resources and Architectural Engineering,2012,10(3):178-181.(in Chinese)
[8]闫长斌,徐国元.爆破振动对采空区稳定性影响的FLAC3D分析[J].岩石力学与工程学报,2005,24(16):2894-2899.Yan Changbin,Xu Guoyuan.Stability analysis of minedout areas influenced by blasting vibration with FLAC3D[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(16):2894-2899.(in Chinese)
[9]Singh P K.Blast vibration damage to underground coal mines from adjacent open-pit blasting[J].International Journal of Rock Mechanics and Mining Sciences,2002,(39):959-973.
[10]李胜林,刘殿书,崔英伟,等.基于实测爆破地震波下的铁路特大桥桥墩动力影响研究[J].北京理工大学学报,2015,35(2):123-126.Li Shenglin,Liu Dianshu,Cui Yingwei.et al.Research on the dynamic effect of long-span railway bridge pier based on real blasting seismic waves[J].Transactions of Beijing Institute of Technology,2015,35(2):123-126.(in Chinese)
[11]陈庆凯,李贵臣,李克民.某露天煤矿高台阶抛掷爆破地震效应监测与分析[J].爆破器材,2008,37(6):30-33.Chen Qingkai,Li Guichen,Li Kemin.Monitor and analysis on explosive seismic effect of high-bench cast blast of surface coal mine[J].Explosive Materials,2008,37(6):30-33.(in Chinese)