岩质边坡在地震荷载作用下的动力响应分析
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摘要
在动力有限元理论的基础上,运用ANSYS软件对石家庄至武汉铁路客运专线岩质边坡进行地震荷载作用下的动力响应分析。获得了位移、加速度和锚杆(索)轴向力放大系数及其变化规律,结果表明:边坡对地震加速度存在放大作用,坡顶水平向峰值加速度为5.13m.s-2,约为输入地震峰值加速度的1.6倍,锚杆(索)框架梁支护能有效地提高岩质边坡的动力稳定性,具有良好的抗震效果。研究结果对岩质边坡的抗震设计具有一定的借鉴意义。
On the basis of dynamic finite element theory,the rock slopes of Shijiazhuang-Wuhan high-speed railway are computed on dynamic response under earthquake load by ANSYS software.The amplification coefficient and change rules of displacement,acceleration of slope response and the axial force of rock bolt(anchor cable)frame beam are obtained.It is shown that the slope has an amplification effect on earthquake acceleration.The horizontal peak acceleration in the slope roof is 5.13 m.s-2and approximately 1.6 times of the input earthquake peak acceleration.The action of bolting(anchor cable)frame beam can enhance the stability of rock slope.The results would have a great reference value to aseismic design of rock slopes.
On the basis of dynamic finite element theory,the rock slopes of Shijiazhuang-Wuhan high-speed railway are computed on dynamic response under earthquake load by ANSYS software.The amplification coefficient and change rules of displacement,acceleration of slope response and the axial force of rock bolt(anchor cable)frame beam are obtained.It is shown that the slope has an amplification effect on earthquake acceleration.The horizontal peak acceleration in the slope roof is 5.13 m.s-2and approximately 1.6 times of the input earthquake peak acceleration.The action of bolting(anchor cable)frame beam can enhance the stability of rock slope.The results would have a great reference value to aseismic design of rock slopes.
引文
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[10]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,2010,26(4):1-7.(Ye Hailin,Zheng Yingren,Huang Runqiu,et al.Analysis on dynamic response of rock bolt in rockslope under earthquake[J].Journal of Logistical engi-neering University,2010,26(4):1-7.(in Chinese))
[2]张华,陆阳,程强.岩质边坡锚杆(索)框架梁加固的数值模拟[J].公路交通科技,2008,25(1):21-26.(Zhang Hua,Lu Yang,Cheng Qiang.Numerical simu-lation of reinforcement for rock slope with rockbolt(an-chor cable)frame beam[J].Journal of Highway andTransportation Research and Development,2008,25(1):21-26.(in Chinese))
[3]张学东,言志信,张森.ANSYS在岩质边坡动力响应分析中的应用[J].西北地震学报,2010,32(2):117-121.(Zhang Xuedong,Yan Zhixin,Zhang Sen.Numerical analysis on dynamic response of rock slope u-sing ANSYS software[J].Northwestern SeismologicalJournal,2010,32(2):117-121.(in Chinese))
[4]郑颖人,沈珠江,龚晓南.岩土塑性力学原理[M].北京:中国建筑工业出版社,2002.(Zheng Yingren,Shen Zhujiang.,Gong Xiaonan.Geotechnical plasticmechanics principle[M].Beijing:China Architecture&Building Press,2002.(in Chinese))
[5]伍平,于建华.结构抗震设计中地震动输入的若干问题[J].西南交通大学学报,2002,37(11):44-49.(Wu Ping,Yu Jianhua.Review on seismic input inaseismic design[J].Journal of Southwest Jiaotong Uni-versity,2002,37(11):44-49.(in Chinese))
[6]刘春玲,祁生文,童立强,等.利用FLAC3D分析某边坡地震稳定性[J].岩石力学与工程学报,2004,23(16):2 730-2 733.(Liu Chunling,Qi Shengwen,TongLiqiang,et al.Stability analysis of slope under earth-quake with FLAC 3D[J].Chinese Journal of Rock Me-chanics and Engineering,2004,23(16):2 730-2 733.(in Chinese))
[7]毕辉.岩质高边坡稳定性及支护结构体系有限元分析[D].武汉:湖北工业大学,2010.(Bi Hui.Analysison high rock slope stability and supporting structure sys-tem with FEM[D].Wuhan:Hubei University of Tech-nology,2010.(in Chinese))
[8]GB500112001,建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.(GB500112001,Code forseismic design of buildings[S].Beijing:China Archi-tecture&Building Press,2001.(in Chinese))
[9]陈昌凯,阮永芬,熊恩来.地震作用下边坡稳定的动力分析方法[J].地下空间与工程学报,2005,1(增1):1 054-1 057.(Cheng Changkai,Ruan Yongfen,Xiong Enlai.Dynamic analysis method of slope stabilityin earthquake function[J].Chinese Journal of Under-ground Space and Engineering,2005,1(Supp.1):1054-1 057.(in Chinese))
[10]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,2010,26(4):1-7.(Ye Hailin,Zheng Yingren,Huang Runqiu,et al.Analysis on dynamic response of rock bolt in rockslope under earthquake[J].Journal of Logistical engi-neering University,2010,26(4):1-7.(in Chinese))
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