加筋土挡墙静动力学特性大模型试验研究
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摘要
为了研究加筋土挡墙在交通荷载作用下的受力变形特性,分别设计了在静载和动载作用下的加筋土挡墙大模型试验,分析了加筋土挡墙的竖向土压力、挡墙面板变形、加载板沉降以及动力加速度等参数的分布规律。试验结果表明:静、动荷载作用下加筋土挡墙受振源荷载的水平影响范围约为0.16H～0.54H(H为墙高),挡墙土压力均呈现水平方向上由振源中心向两侧减小的趋势;同时静动荷载下挡墙面板水平位移的主要影响范围为墙顶往下约为0.55H;加载前期加筋土挡墙内部结构是一个逐渐压密的过程,动荷载作用下加载板沉降量在整个逐级荷载值变化临界处随荷载值的增大呈斜坡"阶梯"式发展;筋土结构对加速度响应有着显著的消散作用,且随着离荷载作用点距离的增大而减小。
The aim of this study is to investigate the stress and deformation characteristics of reinforced earth retaining wall under the action of traffic load. Large-scale model tests on reinforced earth retaining wall were conducted under static load and dynamic load to reveal the distribution of the vertical earth pressure, the deformation of the retaining wall-panel, the loading-plate settlement and the dynamic acceleration. The results showed that the horizontal influence of the reinforced earth retaining wall under the action of static and dynamic loads was about 0.16H-0.54H(where H is wall height). The earth pressure of the retaining wall was reduced in the horizontal direction from the center of the vibration source trend. At the same time, the main influence of the horizontal displacement of the retaining wall under the static load was about 0.55 H. The internal structure of the prefabricated reinforced earth retaining wall was formed by gradual compaction. The settlement of the loading plate under the dynamic load was an inclining "step" shape with the increase of the load value at the critical value of the whole step-load. The reinforced structure had a significant dissipation effect on the acceleration response and decreased with the increase of the distance from the load.
The aim of this study is to investigate the stress and deformation characteristics of reinforced earth retaining wall under the action of traffic load. Large-scale model tests on reinforced earth retaining wall were conducted under static load and dynamic load to reveal the distribution of the vertical earth pressure, the deformation of the retaining wall-panel, the loading-plate settlement and the dynamic acceleration. The results showed that the horizontal influence of the reinforced earth retaining wall under the action of static and dynamic loads was about 0.16H-0.54H(where H is wall height). The earth pressure of the retaining wall was reduced in the horizontal direction from the center of the vibration source trend. At the same time, the main influence of the horizontal displacement of the retaining wall under the static load was about 0.55 H. The internal structure of the prefabricated reinforced earth retaining wall was formed by gradual compaction. The settlement of the loading plate under the dynamic load was an inclining "step" shape with the increase of the load value at the critical value of the whole step-load. The reinforced structure had a significant dissipation effect on the acceleration response and decreased with the increase of the distance from the load.
引文
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[16]杨果林,沈坚,陈建荣.柔性生态型加筋土结构工程应用研究[M].北京:科学出版社,2013.YANG Guo-lin,SHEN Jian,CHEN Jian-rong.Application of flexible ecological reinforced soil structure engineering[M].Beijing:Science Press,2013.
[17]杨广庆,吕鹏,庞巍,等.返包式土工格栅加筋土高挡墙现场试验研究[J].岩土力学,2008,29(2):517-522.YANG Guang-qing,LüPeng,PANG Wei,et al.Research on geogrid reinforced soil retaining wall with wrapped face by in-situ tests[J].Rock and Soil Mechanics,2008,29(2):517-522.
[18]王家全,张亮亮,刘政权,等.土工格栅加筋砂土地基大模型动载试验研究[J].岩土力学,2018,39(10):3539-3547.WANG Jia-quan,ZHANG Liang-liang,LIU Zheng-quan,et al.Large model test on geogrid reinforced sand soil foundation under dynamic loading[J].Rock and Soil Mechanics,2018,39(10):3539-3547.
[2]YANG G Q,LIU H,ZHOU Y T,et al.Post-construction performance of a two-tiered geogrid reinforced soil wall backfilled with soil-rock mixture[J].Geotextiles and Geomembranes,2014,42(2):91-97.
[3]王家全,李良,蒋祖高,等.生态加筋土高挡墙长期变形的现场试验分析[J].广西大学学报(自然科学版),2017,42(4):1407-1414.WANG Jia-quan,LI Liang,JIANG Zu-gao,et al.Field test analysis on long term deformation of ecological reinforced earth retaining wall[J].Journal of Guangxi University(Natural Science Edition),2017,42(4):1407-1414.
[4]刘华北,汪磊,王春海,等.土工合成材料加筋土挡墙筋材内力分析[J].工程力学,2017,34(2):1-11.LIU Hua-bei,WANG Lei,WANG Chun-hai,et al.Analysis methods for the reinforcement loads of geosynthetic-reinforced soil retaining walls[J].Engineering Mechanics,2017,34(2):1-11.
[5]周健,谢鑫波,姜炯,等.包裹式加筋土挡墙的变形特性及影响因素研究[J].岩石力学与工程学报,2015,34(1):148-154.ZHOU Jian,XIE Xin-bo,JIANG Jiong,et al.Deformation characteristics and influence factors of wrap reinforced retaining wall[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(1):148-154.
[6]COSTA C M L,ZORNBERG J G,BUENO B D S,et al.Centrifuge evaluation of the time-dependent behavior of geotextile-reinforced soil walls[J].Geotextiles and Geomembranes,2016,44(2):188-200.
[7]杨广庆,蔡英,苏谦.高路堤加筋土挡土墙变形和受力分析[J].岩石力学与工程学报,2003,22(2):321-326.YANG Guang-qing,CAI Ying,SU Qian.Testing study on deformation and stress of reinforced earth retaining wall for high embankment[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(2):321-326.
[8]陈建峰,柳军修,石振明.软土地基加筋土挡墙数值模拟及稳定性探讨[J].岩石力学与工程学报,2012,31(9):1928-1935.CHEN Jian-feng,LIU Jun-xiu,SHI Zhen-ming.Numerical simulation and stability discussion of a reinforced soil retaining wall on soft soil foundation[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(9):1928-1935.
[9]陈建峰,柳军修,石振明.软弱地基刚/柔性组合墙面加筋土挡墙数值模拟[J].岩石力学与工程学报,2016,35(2):422-432.CHEN Jian-feng,LIU Jun-xiu,SHI Zhen-ming.Numerical simulation of reinforced soil walls with flexible/rigid facings on yielding foundation[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(2):422-432.
[10]王贺,杨广庆,熊保林,等.模块面板式加筋土挡墙结构行为试验研究[J].岩土力学,2016,37(2):487-498.WANG He,YANG Guang-qing,XIONG Bao-lin,et al.An experimental study of the structural behavior of reinforced soil retaining wall with concrete-block pane[J].Rock and Soil Mechanics,2016,37(2):487-498.
[11]王贺,杨广庆,吴连海,等.墙顶荷载对加筋土挡墙工作特性影响的试验研究[J].岩石力学与工程学报,2014,33(12):2573-2581.WANG He,YANG Guang-qing,WU Lian-hai,et al.Experimental study of geogrids reinforced retaining wall under overhead loading[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(12):2573-2581.
[12]王贺,杨广庆,刘华北,等.返包式土工格栅加筋土挡墙动态行为研究[J].铁道学报,2016,38(2):131-140.WANG He,YANG Guang-qing,LIU Hua-bei,et al.Research on dynamic behavior of geogrid reinforced soil retaining wall with wrapped face[J].Journal of the China Railway Society,2016,38(2):131-140.
[13]肖成志,周霞,王嘉勇.受静载和循环荷载作用的基础下加筋挡墙工作性能分析[J].岩石力学与工程学报,2017,36(6):1542-1550.XIAO Cheng-zhi,ZHOU Xia,WANG Jia-yong.Performance study of geogrid-reinforced soil retaining walls subjected to static and cyclic footing loading[J].Chinese Journal of Rock Mechanics and Engineering,2017,36(6):1542-1550.
[14]KRISHNA A M,BHATTACHARJEE A.Behavior of rigid-faced reinforced soil-retaining walls subjected to different earthquake ground motions[J].International Journal of Geomechanics,2016,17(1).DOI:10.10611(ASCE)GM.1943-5622.0000668.
[15]中华人民共和国交通运输部.JTG B01―2014公路工程技术标准[S].北京:人民交通出版社,2014.Ministry of Transport of the People's Republic of China.JTG B01―2014 Technical Standard of Highway Engineering[S].Beijing:China Communications Press,2014.
[16]杨果林,沈坚,陈建荣.柔性生态型加筋土结构工程应用研究[M].北京:科学出版社,2013.YANG Guo-lin,SHEN Jian,CHEN Jian-rong.Application of flexible ecological reinforced soil structure engineering[M].Beijing:Science Press,2013.
[17]杨广庆,吕鹏,庞巍,等.返包式土工格栅加筋土高挡墙现场试验研究[J].岩土力学,2008,29(2):517-522.YANG Guang-qing,LüPeng,PANG Wei,et al.Research on geogrid reinforced soil retaining wall with wrapped face by in-situ tests[J].Rock and Soil Mechanics,2008,29(2):517-522.
[18]王家全,张亮亮,刘政权,等.土工格栅加筋砂土地基大模型动载试验研究[J].岩土力学,2018,39(10):3539-3547.WANG Jia-quan,ZHANG Liang-liang,LIU Zheng-quan,et al.Large model test on geogrid reinforced sand soil foundation under dynamic loading[J].Rock and Soil Mechanics,2018,39(10):3539-3547.
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