循环荷载下非饱和重塑土土钉支护边坡的模型试验研究
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摘要
设计循环荷载下土钉支护边坡室内试验模型,利用多通道协调加载系统,采用正弦波形式的循环荷载进行坡顶加载,频率为2Hz,研究4种载荷参数即10～30,30～50,40～60,40～80kN时循环荷载作用下土钉轴力、面板位移和坡顶沉降的累积效应和面板的动力响应,并研究载荷参数为10～30kN时土钉支护的侧边界效应。研究表明:在考虑侧边界效应时,土钉轴力和面板位移较小;当忽略侧边界效应时,且载荷参数保持不变时,随着加载次数增加,面板加速度、土钉轴力和面板位移有一定增加,坡顶沉降较显著;加载次数相同而载荷平均值增加时,面板加速度变化很小,土钉轴力、面板位移和坡顶沉降出现明显的增长;坡面中部位移似抛物线形状。
A laboratory model for studying dynamic behaviour of soil nailed slope under cyclic load is designed. The sinusoidal cyclic load is produced by a multi-channel load system with four kinds of load magnitude,which are 10–30,30–50,40–60,40–80 kN,and the frequency is 2 Hz.Considering boundary condition influence and accumulative effect of cyclic numbers,axial force of soil nails,displacement and acceleration of the panel, and settlement of top surface,are studied in detail.When the load is 10–30 kN,test results with fixed bilateral boundaries are compared with free ones.Axial force of soil nails and displacement of the panel in the former case are less than that in the latter one under the same cyclic numbers.Then comparative experiments with 4 kinds of load magnitudes with free lateral boundaries are studied.With a certain load magnitude,with increase of cyclic numbers,acceleration and displacement of the panel increases slowly,whereas settlement of top surface increases distinguishedly.With the same cyclic numbers,with increase of average load magnitude,acceleration of panel doesn′t vary obviously,nevertheless axial force of soil nails,displacement of the panel and settlement of top surface increase significantly,and displacement along slope height is parabolic curve like.
A laboratory model for studying dynamic behaviour of soil nailed slope under cyclic load is designed. The sinusoidal cyclic load is produced by a multi-channel load system with four kinds of load magnitude,which are 10–30,30–50,40–60,40–80 kN,and the frequency is 2 Hz.Considering boundary condition influence and accumulative effect of cyclic numbers,axial force of soil nails,displacement and acceleration of the panel, and settlement of top surface,are studied in detail.When the load is 10–30 kN,test results with fixed bilateral boundaries are compared with free ones.Axial force of soil nails and displacement of the panel in the former case are less than that in the latter one under the same cyclic numbers.Then comparative experiments with 4 kinds of load magnitudes with free lateral boundaries are studied.With a certain load magnitude,with increase of cyclic numbers,acceleration and displacement of the panel increases slowly,whereas settlement of top surface increases distinguishedly.With the same cyclic numbers,with increase of average load magnitude,acceleration of panel doesn′t vary obviously,nevertheless axial force of soil nails,displacement of the panel and settlement of top surface increase significantly,and displacement along slope height is parabolic curve like.
引文
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[10]HAIDER S W,HARICHANDRAN R S.Relating axle load spectra to truck gross vehicle weights and volumes[J].Journal of Transportation Engineering,2007,133(12):696–705.
[11]KRUNTCHEVA M R,COLLOP A C,THOM N H.Effect of bond condition on flexible pavement performance[J].Journal of Transportation Engineering,2005,131(11):880–888.
[12]杨果林,王永和.加筋土挡墙在重复荷载作用下的模型试验与动态响应分析[J].岩石力学与工程学报,2002,21(10):1541–1546.(YANG Guolin,WANG Yonghe.Model testing and dynamic respond analysis on reinforced earth wall under repeated load[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(10):1541–1546.(in Chinese))
[13]白顺果,侯永峰,张鸿儒.交通荷载下饱和软基的模型试验及变形分析[J].中国安全科学学报,2004,14(12):108–110,107.(BAI Shunguo,HOU Yongfeng,ZHANG Hongru.Model test and deformation analysis on saturated soft foundation under traffic loading[J].China Safety Science Journal,2004,14(12):108–110,107.(in Chinese))
[14]颜可珍,夏唐代,姜爱华.交通荷载作用下地基中瑞利波的传播特性[J].岩土力学,2004,25(增2):414–417.(YAN Kezhen,XIA Tangdai,JIANG Aihua.Characteristics of rayleigh wave in soils generated by traffic load[J].Rock and Soil Mechanics,2004,25(Supp.2):414–417.(in Chinese))
[15]陈忠源,戴自航.土钉抗弯剪能力分析[J].福州大学学报(自然科学版),2007,35(5):744–748.(CHEN Zhongyuan,DAI Zihang.Analysis on bending and shearing capability of soil nails[J].Journal of Fuzhou University(Natural Science),2007,35(5):744–748.(in Chinese))
[16]何建勇,张钦喜,朱绪平,等.土钉抗弯抗剪性能的数值分析[J].北京工业大学学报,2004,30(4):446–449.(HE Jianyong,ZHANG Qinxi,ZHU Xuping,et al.An analysis of soil nailings intension against shear and moment[J].Journal of Beijing University of Technology,2004,30(4):446–449.(in Chinese))
[17]蔡英,曹新文.重复加载下路基填土的临界动应力和永久变形初探[J].西南交通大学学报,1996,31(1):1–5.(CAI Ying,CAO Xinwen.Study of the critical dynamic stress and permanent strain of the subgrade-soil under the repeated load[J].Journal of Southwest Jiaotong University,1996,31(1):1–5.(in Chinese))
[18]张明聚.土钉支护工作性能的研究[博士学位论文][D].北京:清华大学,2000:107–108.(ZHANG Mingju.Research on behaviors of soil nailing[Ph.D.Thesis][D].Beijing:Tsinghua University,2000:107–108.(in Chinese))
[2]彭炳芬.谈山区重载公路的路基支挡加固措施[J].路基工程,2004,117(6):43–45.(PENG Bingfen.Discussions on reinforcement methods of embankment with heavy traffic load in moutainous areas[J].Embankment Engineering,2004,117(6):43–45.(in Chinese))
[3]董建华,朱彦鹏.地震作用下土钉支护高速公路边坡动力参数分析[J].西安建筑科技大学学报(自然科学版),2007,39(5):661–666.(DONG Jianhua,ZHU Yanpeng.Parametric analysis on seismic behavior of highway slope protected by soil nailing retaining wall under earthquake[J].Journal of Xi′an University of Architecture and Technology(Natural Science),2007,39(5):661–666.(in Chinese))
[4]张宗领.复合土钉支护施工过程及地震作用下的有限元分析[硕士学位论文][D].兰州:兰州理工大学,2007.(ZHANG Zongling.The FE analysis of composite soil nailed wall in construction process and earthquake action[M.S.Thesis][D].Lanzhou:Lanzhou University of Technology,2007.(in Chinese))
[5]王光彬.土钉支护施工过程及地震作用下的有限元分析[硕士学位论文][D].兰州:兰州理工大学,2006.(WANG Guangbin.The FEM Analysis of soil Nailing Wa11in Construction Process and Earthquake Action[M.S.Thesis][D].Lanzhou:Lanzhou University of Technology,2006.(in Chinese))
[6]喻晓今.土钉瞬态应力动力特性对比研究[J].合肥工业大学学报(自然科学版),2007,30(11):1505–1508.(YU Xiaojin.Contrast research on dynamic behavior of transient stresses in soil nails[J].Journal of Hefei University of Technology(Natural Science),2007,30(11):1505–1508.(in Chinese))
[7]曾宪明,杜云鹤,李世民.土钉支护抗动载原型与模型对比试验研究[J].岩石力学与工程学报,2003,22(11):1892–1897.(ZENG Xianming,DU Yunhe,LI Shimin.Testing study of prototype and model comparison on resisting dynamical load with soil nail supporting[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(11):1892–1897.(in Chinese))
[8]中国人民解放军总参谋部.土钉支护技术规范(GJB5055–2006)[S].北京:人民交通出版社,2007.(General Staff Headquarters of People's Liberation Army of China.GJB5055–2006Technical specifications for soil nailed support[S].Beijing:China Communications Press,2007.(in Chinese))
[9]查文华,洪宝宁,徐毅.交通荷载下低路堤高速公路路面路基振动测试与分析[J].公路工程,2007,32(4):113–117.(ZHA Wenhua,HONG Baoning,XU Yi.Vibration measurement and analysis of low embankment freeway pavement and roadbed under traffic loading[J].Highway Engineering,2007,32(4):113–117.(in Chinese))
[10]HAIDER S W,HARICHANDRAN R S.Relating axle load spectra to truck gross vehicle weights and volumes[J].Journal of Transportation Engineering,2007,133(12):696–705.
[11]KRUNTCHEVA M R,COLLOP A C,THOM N H.Effect of bond condition on flexible pavement performance[J].Journal of Transportation Engineering,2005,131(11):880–888.
[12]杨果林,王永和.加筋土挡墙在重复荷载作用下的模型试验与动态响应分析[J].岩石力学与工程学报,2002,21(10):1541–1546.(YANG Guolin,WANG Yonghe.Model testing and dynamic respond analysis on reinforced earth wall under repeated load[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(10):1541–1546.(in Chinese))
[13]白顺果,侯永峰,张鸿儒.交通荷载下饱和软基的模型试验及变形分析[J].中国安全科学学报,2004,14(12):108–110,107.(BAI Shunguo,HOU Yongfeng,ZHANG Hongru.Model test and deformation analysis on saturated soft foundation under traffic loading[J].China Safety Science Journal,2004,14(12):108–110,107.(in Chinese))
[14]颜可珍,夏唐代,姜爱华.交通荷载作用下地基中瑞利波的传播特性[J].岩土力学,2004,25(增2):414–417.(YAN Kezhen,XIA Tangdai,JIANG Aihua.Characteristics of rayleigh wave in soils generated by traffic load[J].Rock and Soil Mechanics,2004,25(Supp.2):414–417.(in Chinese))
[15]陈忠源,戴自航.土钉抗弯剪能力分析[J].福州大学学报(自然科学版),2007,35(5):744–748.(CHEN Zhongyuan,DAI Zihang.Analysis on bending and shearing capability of soil nails[J].Journal of Fuzhou University(Natural Science),2007,35(5):744–748.(in Chinese))
[16]何建勇,张钦喜,朱绪平,等.土钉抗弯抗剪性能的数值分析[J].北京工业大学学报,2004,30(4):446–449.(HE Jianyong,ZHANG Qinxi,ZHU Xuping,et al.An analysis of soil nailings intension against shear and moment[J].Journal of Beijing University of Technology,2004,30(4):446–449.(in Chinese))
[17]蔡英,曹新文.重复加载下路基填土的临界动应力和永久变形初探[J].西南交通大学学报,1996,31(1):1–5.(CAI Ying,CAO Xinwen.Study of the critical dynamic stress and permanent strain of the subgrade-soil under the repeated load[J].Journal of Southwest Jiaotong University,1996,31(1):1–5.(in Chinese))
[18]张明聚.土钉支护工作性能的研究[博士学位论文][D].北京:清华大学,2000:107–108.(ZHANG Mingju.Research on behaviors of soil nailing[Ph.D.Thesis][D].Beijing:Tsinghua University,2000:107–108.(in Chinese))
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