地震作用下边坡预应力锚索振动台试验研究
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摘要
为研究边坡预应力锚索在地震作用下的动力响应,采用振动台进行预应力锚索支护岩质边坡模型试验。模型试验相似关系依据重力相似律及量纲分析法推导。输入Wolong,El Centrol,TAFT三种地震波,监测锚索轴力、坡面加速度和位移时程,研究预应力锚索轴力和预应力损失在地震作用下的动力特性、边坡在锚索支护下的整体稳定性。结果表明:不同地震作用下,锚索的轴力和预应力损失动力响应不同,试验中锚索的预应力损失最大达15.7%,随着输入地震波峰值的增大,锚索预应力损失呈先增大后减小的趋势,达到临界值后,不再发生预应力损失。建议预应力锚索抗震设计时,施加的预应力应该达到预应力设计值的1.1～1.2倍,高于静力情况下的值。该研究结果可为更加合理的进行边坡预应力锚索抗震设计提供良好的基础。
the large-scale shaking table model test is adopted for study the behavior associated with earthquake shaking of the prestressed anchor cable retaining the slope.Similarity relation is derived by law of gravitivity similitude and dimension analysis method.Three kinds of seismic waves are inputted to study the dynamic response characters of prestressed anchor cable while the amplitudes of input seismic waves are increased.Axial force of prestressed anchor cable and the acceleration and displacement time history are monitored to study the loss of prestress and axial force of prestressed anchor cable subjected to earthquake shaking.Slope stability is also studied.The results show that loss of axial force and prestress of prestressed anchor cable varies with the change of input seismic wave.The maximum value of prestressing loss is 15.7% and with the increment of the peak value of input seismic waves,the prestresssing loss increased at first and then decreased to the critical value while prestressing loss is no longer occurred.It is proposed that the applied prestress value should be 1.1 to 1.2 times of the designed value of the prestress during seismic design of prestessed cable anchor,which is higher than the value under static conditions.
the large-scale shaking table model test is adopted for study the behavior associated with earthquake shaking of the prestressed anchor cable retaining the slope.Similarity relation is derived by law of gravitivity similitude and dimension analysis method.Three kinds of seismic waves are inputted to study the dynamic response characters of prestressed anchor cable while the amplitudes of input seismic waves are increased.Axial force of prestressed anchor cable and the acceleration and displacement time history are monitored to study the loss of prestress and axial force of prestressed anchor cable subjected to earthquake shaking.Slope stability is also studied.The results show that loss of axial force and prestress of prestressed anchor cable varies with the change of input seismic wave.The maximum value of prestressing loss is 15.7% and with the increment of the peak value of input seismic waves,the prestresssing loss increased at first and then decreased to the critical value while prestressing loss is no longer occurred.It is proposed that the applied prestress value should be 1.1 to 1.2 times of the designed value of the prestress during seismic design of prestessed cable anchor,which is higher than the value under static conditions.
引文
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[12]叶海林,郑颖人,黄润秋,等.强度折减动力分析法在滑坡抗滑桩抗震设计中的应用研究[J].岩土力学,2010,31(增1):317–323.(YEHailin,ZHENG Yingren,HUANG Runqiu,et al.Study of applicationof strength reduction dynamic analysis method to aseismic design ofanti-slide piles for landslide[J].Rock and Soil Mechanics,2010,31(Supp.1):317–323.(in Chinese))
[13]叶海林,郑颖人,黄润秋,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,ZHENG Yingren,HUANG Runqiu,et al.Analysis on dynamicresponse of rockbolt in rock slope under earthquake[J].ChineseJournal of Geotechnical Engineering,2010,32(9):1 374–1 379.(inChinese))
[14]IAI S.Similitude for shaking table tests on soil-structure fluid modelin 1g gravitational field[J].Soils and Foundations,1989,29(1):105–118.
[15]MEYMAN D,PHILIP J.Shaking table scale model tests of nonlinearsoil-pile-superstructure interaction in soft clay[Ph.D.Thesis][D].Berkeley:Berkeley University,1998.
[2]高大水,曾勇.三峡永久船闸高边坡锚索预应力状态监测分析[J].岩石力学与工程学报,2001,20(5):653–656.(GAO Dashui,ZENGYong.Monitoring analysis of prestress state of anchor cable ofhigh slope in the TGP Permanent shiplocks[J].Chinese Journal ofRock Mechanics and Engineering,2001,20(5):653–656.(inChinese))
[3]曾宪明,陈肇元,王靖涛,等.锚固类结构安全性与耐久性问题探讨[J].岩石力学与工程学报,2004,23(13):2235–2242.(ZENGXianming,CHEN Zhaoyuan,WANG Jingtao,et al.Research onsafety and durability of bolt and cable-supported structures[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(13):2 235–2 242.(in Chinese))
[4]李宁,钱七虎.岩质高边坡稳定性分析与评价中的四个准则[J].岩石力学与工程学报,2010,29(9):1754–1760.(LI Ning,QIANQihu.Four criteria of stability analysis and assessment of highrock slope[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(9):1 754–1 760.(in Chinese))
[5]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,XU Weiya.Review andprospect of anchorage properties of reinforced rock mass underearthquake[J].Metal Mine,2006,(3):5–11.(in Chinese))
[6]李忠,朱彦鹏.框架预应力锚杆边坡支护结构稳定性计算方法及其应用[J].岩石力学与工程学报,2005,24(21):3922–3926.(LIZhong,ZHU Yanpeng.Stability calculation methods for grillagesupporting structure with presstressed anchor and its application[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(21):3 922–3 926.(in Chinese))
[7]李英勇,王梦恕,张顶立,等.锚索预应力变化影响因素及模型研究[J].岩石力学与工程学报,2008,27(增2):3140–3146.(LIYingyong,WANG Mengshu,ZHANG Dingli,et al.Study oninfluential factors and model for variation of anchor cable presress[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(Supp.2):3 140–3 146.(in Chinese))
[8]杨苏杭,梁斌,顾金才,等.锚固洞室抗爆模型试验锚索预应力变化特性研究[J].岩石力学与工程学报,2006,25(增2):3749–3 756.(YANG Suhang,LIANG Bin,GU Jincai,et al.Reserch oncharacteristics of prestress change of anchorage cable in anti-expulsion model test of anchored cavern[J].Chinese Journal of RockMechanics and Engineering,2006,25(Supp.2):3 749–3 756.(inChinese))
[9]苏华友,张继春.紫坪铺进水口高陡边坡锚索抗爆破振动分析[J].岩石力学与工程学报,2003,22(11):1916–1918.(SU Huayou,ZHANG Jichun.Analysis of blasting vibration effect on prestressedcable of high slope in Zipingpu project[J].Chinese Journal of RockMechanics and Engineering,2003,22(11):1 916–1 918.(in Chinese))
[10]秋仁东,石玉成,徐舜华,等.预应力锚索加固石窟岩体的地震动力响应研究[J].西北地震学报,2007,29(1):49–54.(QIU Rendong,SHI Yucheng,XU Shunhua,et al.Study on dynamical responseof grotto rock reinforced by prestress anchor cable under the seismicload[J].North Western Seismological Journal,2007,29(1):49–54.(in Chinese))
[11]郑颖人,叶海林,黄润秋,等.边坡地震稳定性分析探讨[J].地震工程与工程振动,2010,30(2):66–73.(ZHENG Yingren,YE Hailin,HUANG Runqiu,et al.Study on the stability analysis of earthquakeslope[J].Earthquake Engineering and Engineering Vibration,2010,30(2):66–73.(in Chinese))
[12]叶海林,郑颖人,黄润秋,等.强度折减动力分析法在滑坡抗滑桩抗震设计中的应用研究[J].岩土力学,2010,31(增1):317–323.(YEHailin,ZHENG Yingren,HUANG Runqiu,et al.Study of applicationof strength reduction dynamic analysis method to aseismic design ofanti-slide piles for landslide[J].Rock and Soil Mechanics,2010,31(Supp.1):317–323.(in Chinese))
[13]叶海林,郑颖人,黄润秋,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,ZHENG Yingren,HUANG Runqiu,et al.Analysis on dynamicresponse of rockbolt in rock slope under earthquake[J].ChineseJournal of Geotechnical Engineering,2010,32(9):1 374–1 379.(inChinese))
[14]IAI S.Similitude for shaking table tests on soil-structure fluid modelin 1g gravitational field[J].Soils and Foundations,1989,29(1):105–118.
[15]MEYMAN D,PHILIP J.Shaking table scale model tests of nonlinearsoil-pile-superstructure interaction in soft clay[Ph.D.Thesis][D].Berkeley:Berkeley University,1998.
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