露天-地下联合开采中洞室群动力响应分析
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摘要
利用FLAC3D软件模拟了露天爆破荷载作用下地下洞室群的动态响应.采用IDTS3850测试仪实测爆破振动数据,利用萨道夫斯基经验公式计算在最大装药量和最短爆心距情况下的爆破振动参数;将速度时程转换为应力时程,并利用FLAC3D内置的Fish函数,通过在边界节点或内部节点上输入动力荷载时程来实现动力加载,然后从塑性区、位移和应力方面对动力模拟和静力分析结果进行比较,得出动力荷载对洞室群稳定性的影响状况.研究表明:爆破振动会加大洞室群的竖直位移,尤其是洞室间交叉区域的位移;施加动力荷载后,对静力作用下所产生的应力集中有一定的卸荷作用,还会增大洞室壁的片帮,但不会使洞室群整体破坏.
The dynamic response of underground caverns under open blasting loads was simulated with FLAC3D software.On the basis of data from seismic waves measured with an IDTS3850 tester,blasting vibration parameters in the case of the maximal charge amount of explosives and the shortest blasting distance were calculated with Sadowsky's empirical formula.By conversion of the velocity-time history into the stress-time history and by use of the Fish function built-in FLAC3D software,dynamic loading was carried out by inputting the dynamic load-time history at boundary nodes or internal nodes.After comparison between the dynamic simulation and static analysis of plastic zones,displacement and stress,the corresponding impact of dynamic loads on the stability of caverns was assessed.It is shown that blasting vibrations can magnify the vertical displacement of caverns,especially in intersect zones,and on the other hand,the stress concentration under static action is alleviated when a dynamic load is applied.Besides,it also aggravates the wall fall of cavities,but cannot result in overall destruction.
The dynamic response of underground caverns under open blasting loads was simulated with FLAC3D software.On the basis of data from seismic waves measured with an IDTS3850 tester,blasting vibration parameters in the case of the maximal charge amount of explosives and the shortest blasting distance were calculated with Sadowsky's empirical formula.By conversion of the velocity-time history into the stress-time history and by use of the Fish function built-in FLAC3D software,dynamic loading was carried out by inputting the dynamic load-time history at boundary nodes or internal nodes.After comparison between the dynamic simulation and static analysis of plastic zones,displacement and stress,the corresponding impact of dynamic loads on the stability of caverns was assessed.It is shown that blasting vibrations can magnify the vertical displacement of caverns,especially in intersect zones,and on the other hand,the stress concentration under static action is alleviated when a dynamic load is applied.Besides,it also aggravates the wall fall of cavities,but cannot result in overall destruction.
引文
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[12]FLAC3D(Fast Lagrangian Analysis ofContinua in3D)Users Manual.Version3·0.Itasca ConsultingGroup Inc,2005
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[3]WangW L,WangT T,Su J J,et a.l Assessment of damage in mountain tunnels due to the Taiwan Chi-Chi earthquake.Tunne-ling Underground SpaceTechnol,2001,16(3):133
[4]Singh PK.Blastvibration damage to underground coalmines from adjacent open-pit blasting.Int J RockMech Min Sci,2002,39(8):959
[5]LiH N,Wang B Q,Lin G.Studies on some problems on explo-sion earthquake responses.ExplosShockWaves,1996,16(1):61(李宏男,王炳乾,林皋.爆破地震效应若干问题的探讨.爆炸与冲击,1996,16(1):61)
[6]Yang R L,Rocque P,Katsabanis P,et a.l Measurement and analysis of near-field blast vibration and damage.Geotech Geol Eng,1994,12(3):169
[7]KuhlemeyerR L,Lysmer J.Finite elementmethod accuracy for wave propagation problems.J SoilMech Found Div,1973,99(5):421
[8]YangW M,ChenW Z,LiS C,eta.l Analysis on stability of sur-rounding rockmass ofLongtan large underground powerhouse with FLAC3D.Chin JGeotech Eng,2005,27(2):230(杨为民,陈卫忠,李术才,等.快速拉格朗日法分析巨型地下洞室群稳定性.岩土工程学报,2005,27(2):230)
[9]Chen Y M.FLAC/FLAC3D Foundation and Engineering Exam-ples.Beijing:China Water Conservancy and Hydropower Press,2009(陈育民.FLAC/FLAC3D基础与工程实例.北京:中国水利水电出版社,2009)
[10]SoilMechanicsTeaching and Research Group,EastChina Insti-tute ofWater Conservancy.SoilMechanicsTheory and Calcula-tions.Beijing:WaterResources and Electric PowerPress,1984(华东水利学院土力学教研室.土工原理与计算.北京:水利电力出版社,1984)
[11]Yan C B,XuG Y,LiX B.Stability analysis ofareas influenced by blasting vibration with FLAC3D.Chin J Rock Mech Eng,2005,24(16):2894(闫长斌,徐国元,李夕兵.爆破震动对采空区稳定性影响的FLAC3D分析.岩石力学与工程学报,2005,24(16):2894)
[12]FLAC3D(Fast Lagrangian Analysis ofContinua in3D)Users Manual.Version3·0.Itasca ConsultingGroup Inc,2005
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