竖向排列地下硐室群动力稳定性的数值模拟分析
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摘要
以竖向排列地下硐室群为研究对象,将爆破地震波简化为谐波形式,运用三维有限差分程序FLAC3D研究不同速度、不同动荷载频率以及不同硐室间距条件下硐室群隔板位移和围岩塑性区面积的变化规律,以及上方硐室跨度变化对隔板位移和下方硐室稳定性的影响,通过工程实例分析爆破震动作用下地下硐室群的稳定性。研究结果表明:动荷载速度对地下硐室群稳定性的影响最明显,隔板位移和围岩塑性区面积随爆破地震波速度增大而增大;随着爆破地震波频率的增大,隔板位移先增大后减小;随着硐室间距的增加,隔板位移减小,有利于地下硐室群的稳定;随着上方硐室跨度增加,隔板位移增大;地下硐室群围岩中出现多处应力集中,但最大拉应力小于岩体的抗拉强度,不会出现拉裂破坏;分析结果与实际观测结果相吻合。
Based on vertically arranged underground chambers,when blasting seismic wave was simplified to harmonic wave,the law of displacement of interlayer and the area of plastic zone of surrounding rock at different amplitudes,different frequencies of blasting seismic wave and different spaces between chambers was systemically studied by using the program of FLAC~(3D).The influence on the displacement of interlayer and the stability of the bottom chamber by the variance of the span of upper chamber were also discussed.The stability of underground chambers at blasting vibration was analyzed through engineering case.The results show that the influence of amplitude on the stability of underground chambers is the most obvious,and the displacement of interlayer and the area of plastic zone of surrounding rock increase with the increase of amplitude.The displacement of interlayer increases at the beginning and then decreases with the increase of frequency.With the increase of space between chambers,the displacement of interlayer decreases,which is advantageous for the stability of chambers.The displacement increases with the increase of span of above chamber;The stress concentration occurs at many places in surrounding rock,while the maximum tension stress is less than tensile strength of rock mass,so tensile crack does not take place.The analytical results are in accordance with the observed results.
Based on vertically arranged underground chambers,when blasting seismic wave was simplified to harmonic wave,the law of displacement of interlayer and the area of plastic zone of surrounding rock at different amplitudes,different frequencies of blasting seismic wave and different spaces between chambers was systemically studied by using the program of FLAC~(3D).The influence on the displacement of interlayer and the stability of the bottom chamber by the variance of the span of upper chamber were also discussed.The stability of underground chambers at blasting vibration was analyzed through engineering case.The results show that the influence of amplitude on the stability of underground chambers is the most obvious,and the displacement of interlayer and the area of plastic zone of surrounding rock increase with the increase of amplitude.The displacement of interlayer increases at the beginning and then decreases with the increase of frequency.With the increase of space between chambers,the displacement of interlayer decreases,which is advantageous for the stability of chambers.The displacement increases with the increase of span of above chamber;The stress concentration occurs at many places in surrounding rock,while the maximum tension stress is less than tensile strength of rock mass,so tensile crack does not take place.The analytical results are in accordance with the observed results.
引文
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[2]Huang W L.Assessment of damage in mountain tun-nels due to the Taiwan Chi-Chi earthquake[J].Tunne-ling and Underground Space Technology,2001,16(2):133 150.
[3]陈健云,胡志强,林皋,等.超大型地下洞室群的随机地震响应分析[J].水利学报,2002(1):71 75.CHEN Jian-yun,HU Zhi-qiang,LIN Gao,et al.Ran-dom seismic response analysis of large scale under-ground caverns[J].Shuili Xuebao,2002(1):71 75.
[4]Chern J C,Chang Y L,Lee H C.Seismic safety analy-sis of Kukuan underground power cavern[J].Tunne-ling and Underground Space Technology,2004,19(5):516 527.
[5]许增会,宋宏伟,赵坚.地震对隧道围岩稳定性影响的数值模拟分析[J].中国矿业大学学报,2004,33(1):40 43.XU Zeng-hui,SONG Hong-wei,ZHAO Jian.Numeri-cal analysis of stability of tunnel surrounding rocks un-der earthquake[J].Journal of China University ofMining&Technology,2004,33(1):40 43.
[6]Singh P K.Blast vibration damage to underground coalmines from adjacent open-pit blasting[J].InternationalJournal of Rock Mechanics&Mining Sciences,2002,39(8):959 973.
[7]谭忠盛,杨小林,王梦恕.复线隧道施工爆破对既有隧道的影响分析[J].岩石力学与工程学报,2003,22(2):281 285.TAN Zhong-sheng,YANG Xiao-lin,WANG Meng-shu.Effect of blast in double line tunnel on existingtunnel[J].Chinese Journal of Rock Mechanics andEngineering,2003,22(2):281 285.
[8]Yang R L,Rocque P,Katsabanis P,et al.Measure-ment and analysis of near-field blast vibration and dam-age[J].Geotechnical&Geotechnical Engineering,1994,12(3):169 182.
[9]言志信,王永和,江平,等.爆破地震测试及建筑结构安全标准研究[J].岩石力学与工程学报,2003,22(11):1907 1911.YAN Zhi-xin,WANG Yong-he,JIANG Ping,et al.Study on measurement of blast induced seism and build-ing safety criteria[J].Chinese Journal of Rock Me-chanics and Engineering,2003,22(11):1907 1911.
[10]Akky M R,Rosidi D,Madianos M N,et al.Dynamicanalysis of large underground caverns using discrete-element code verification and reliability[C]//Salam ME A.Tunneling and Ground Conditions.Cairo:ProcCongress,1994:477 484.
[11]陈卫军,张璞.列车动载作用下交叠隧道动力响应数值模拟[J].岩土力学,2003,23(6):770 774.CHEN Wei-jun,ZHANG Pu.Numerical simulationof dynamic response of overlap tunnels in close prox-imity due to train vibrating load[J].Rock and SoilMechanics,2003,23(6):770 774.
[12]潘昌实.隧道力学数值方法[M].北京:中国铁道出版社,1995.PAN Chang-shi.Numerical methods of tunnel me-chanics[M].Beijing:Chinese Railway Press,1995.
[13]张璞.列车振动荷载作用下上下近距离地铁区间交叠隧道的动力响应分析[D].上海:同济大学土木工程学院,2001.ZHANG Pu.Analysis of dynamic response of criss-cross and overlapping tunnels between stations in closeproximity due to train vibrating load[D].Shanghai:School of Civil Engineering,Tongji University,2001.
[14]Itasca Consulting Group Inc.FLAC3D(Fast lagrangiananalysis of continua in 3 dimensions),Version 2.10,Users manual[M].Minnesota:Itasca ConsultingGroup Inc,2002.
[15]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,2003,22(5):12 14.YIN Xian-gang,LI Shu-lin,TANG Hai-yan,et al.The tests and studies of physical mechanical propertiesof the rocks of Changba Lead-Zinc mine[J].MiningResearch and Development,2003,22(5):12 14.
[16]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 Chun-ling,QI Sheng-wen,TONG Li-qiang,etal.Stability analysis of slope under earthquake withFLAC3D[J].Chinese Journal of Rock Mechanics andEngineering,2004,23(16):2730 2733.
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