边坡锚杆地震动特性的振动台试验研究
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摘要
为研究锚杆在地震作用下的动力响应,采用振动台进行锚杆支护岩质边坡模型试验。模型与原型相似关系按照重力相似律、相似比1∶10推导。输入Wolong、El Centro、Taft三种地震波,监测锚杆轴力、坡面加速度和位移时程,研究锚杆在地震作用下的受力机制、锚杆轴力分布规律、不同位置锚杆在地震作用下的动力响应差别。结果表明:地震作用下锚杆的轴力动力受力过程是由外向里;输入相同幅值的不同地震波,锚杆轴力动力响应不同;地震波强度较小时,位于边坡腰部锚杆的轴力最大,但随着地震波强度的增大,坡顶锚杆轴力增加较快,与边坡腰部锚杆轴力均为最大。研究结果为更加合理的进行锚杆抗震设计提供良好的基础。
In order to study the dynamic responses of anchor bars under earthquake,shaking table is adopted in the simulation experiments of rock slope supported by anchor bars.The similarity between the model and the prototype is in accordance with the similarity law of gravity and the similar ratio is 1∶10.The mechanism behavior of anchor bars under earthquake,the distribution of the axial force of anchor bars and the difference of dynamic response of anchor bars in different location are studied through inputting three kinds of seismic waves of Wolong,El Centro and Taft and monitoring the axial force of anchor bars,the acceleration on the slope and the displacement of time history.The results show that the force on the axial under earthquake develops from the outside to the inside,and different seismic waves with the same amplitude result in different dynamic response.When the seismic wave is little,the axial force of the anchor bars in the middle slope is maximum,which with the increase of the strength of seismic wave,the axial force of the anchor bars on the slope top increases most rapidly and the force of the anchor bars in the milled of the slope is also at maximum.The results provide a reasonable foundation for the design of the anchor bars supporting under earthquake.
In order to study the dynamic responses of anchor bars under earthquake,shaking table is adopted in the simulation experiments of rock slope supported by anchor bars.The similarity between the model and the prototype is in accordance with the similarity law of gravity and the similar ratio is 1∶10.The mechanism behavior of anchor bars under earthquake,the distribution of the axial force of anchor bars and the difference of dynamic response of anchor bars in different location are studied through inputting three kinds of seismic waves of Wolong,El Centro and Taft and monitoring the axial force of anchor bars,the acceleration on the slope and the displacement of time history.The results show that the force on the axial under earthquake develops from the outside to the inside,and different seismic waves with the same amplitude result in different dynamic response.When the seismic wave is little,the axial force of the anchor bars in the middle slope is maximum,which with the increase of the strength of seismic wave,the axial force of the anchor bars on the slope top increases most rapidly and the force of the anchor bars in the milled of the slope is also at maximum.The results provide a reasonable foundation for the design of the anchor bars supporting under earthquake.
引文
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[10]Stamatopoulosa C A,Bassanoua M,Brennanb A J,et al.Mitigation of the seismic motion near the edge of cliff-typetopographies[J].Soil Dynamics and EarthquakeEngineering,2007,(27):1082-1100
[11]叶海林,郑颖人,黄润秋,等.锚杆支护岩质边坡地震动力响应分析[J].后勤工程学院学报,2010(4):5-11(Ye Hailin,Zheng Yingren,Huang Runqiu,et al.Analysis on dynamic response of rockbolt in rock slopeunder earthquake[J].Journal of Logistical EngineeringUniversity,2010(4):5-11(in Chinese))
[12]叶海林,黄润秋,郑颖人,等.岩质边坡锚杆支护参数地震敏感性分析[J].岩土工程学报,2010,32(9):1374-1379(Ye Hailin,Huanng Runqiu,Zheng Yingren,et al.Sensitivity analysis of parameters for bolts in rock slopesunder earthquakes[J].Chinese Journal of GeotechnicalEngineering,2010,32(9):1374-1379(in Chinese))
[13]Susumu I.Similitude for shaking table tests on soil-structure fluid model in 1-g gravitational field[J].Soilsand Foundations,1989,29(1):105-118
[14]Meymand P J.Shaking table scale model tests of nonlinearsoil-pile-superstructure interaction in soft clay[D].U.C.Berkeley,1998
[2]Grasselli G.3D behavior of bolted rock joints:experimentaland numerical study[J].Int.J.Rock Mech.and Min.Sci.,2005,42(1):13-24
[3]洪海春,徐卫亚.地震作用下岩体锚固性能研究综述与展望[J].金属矿山,2006(3):5-11(Hong Haichun,XuWeiya.Review and prospect of anchorage properties ofreinforced rockmass under earthquake[J].Metal Mine,2006(3):5-11(in Chinese))
[4]Tannantf D D,Brummerf R K,Yi X.Rock bolt behaviorunder dynamic loading:field tests and modeling[J].Int.J.Rock Mech.Min.Sci.&Geomech,Abstr.,1995,32(6):537-550
[5]薛亚东,张世平,康天合.回采巷道锚杆动载响应的数值分析[J].岩石力学与工程学报,2003,22(11):1903-1906(Xue Yadong,Zhang Shiping,Kang Tianhe.Numerical analysis on dynamical response of rock boost inmining roadways[J].Chinese Journal of Rock Mechanicsand Engineering,2003,22(11):1903-1906(in Chinese))
[6]董建华,朱彦鹏.框架锚杆支护边坡地震响应分析[J].兰州理工大学学报,2008,34(2):118-124(DongJianhua,Zhu Yanpeng.Analysis of response of slopesupported with framed anchor to earthquake[J].Journal ofLanzhou University of Technolog,2008,34(2):118-124(in Chinese))
[7]高峰,石玉成,韦凯,等.锚杆加固对石窟地震反应的影响[J].世界地震工程,2006,22(2):84-88(Gao Feng,Shi Yucheng,Wei Kai,et al.The influence of anchor boltsupports on seismic responses of strengthening grottoes[J].World Earthquake Engineering,2006,22(2):84-88(inChinese))
[8]Zhang C S,Zou D H,Madenga V.Numerical simulationof wave propagation in grouted rock bolts and the effects ofmesh density and wave frequency[J].International Journalof Rock Mechanics&Mining Sciences,2006(43):634-639
[9]汪鹏程,朱大勇,许强.强震作用下加固边坡的动力响应及不同加固方式的比较研究[J].合肥工业大学学报,2009,32(10):1501-1504(Wang Pengcheng,ZhuDayong,Xu Qiang.Dynamic response of slopes subjectedto intense earthquakes and effect comparison betweenvarious support modes[J].Journal of Hefei University ofTechnology,2009,32(10):1501-1504(in Chinese))
[10]Stamatopoulosa C A,Bassanoua M,Brennanb A J,et al.Mitigation of the seismic motion near the edge of cliff-typetopographies[J].Soil Dynamics and EarthquakeEngineering,2007,(27):1082-1100
[11]叶海林,郑颖人,黄润秋,等.锚杆支护岩质边坡地震动力响应分析[J].后勤工程学院学报,2010(4):5-11(Ye Hailin,Zheng Yingren,Huang Runqiu,et al.Analysis on dynamic response of rockbolt in rock slopeunder earthquake[J].Journal of Logistical EngineeringUniversity,2010(4):5-11(in Chinese))
[12]叶海林,黄润秋,郑颖人,等.岩质边坡锚杆支护参数地震敏感性分析[J].岩土工程学报,2010,32(9):1374-1379(Ye Hailin,Huanng Runqiu,Zheng Yingren,et al.Sensitivity analysis of parameters for bolts in rock slopesunder earthquakes[J].Chinese Journal of GeotechnicalEngineering,2010,32(9):1374-1379(in Chinese))
[13]Susumu I.Similitude for shaking table tests on soil-structure fluid model in 1-g gravitational field[J].Soilsand Foundations,1989,29(1):105-118
[14]Meymand P J.Shaking table scale model tests of nonlinearsoil-pile-superstructure interaction in soft clay[D].U.C.Berkeley,1998
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