面板对加筋土挡墙影响的离心模型试验研究
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摘要
加筋土挡墙因其特有的景观性能、协调变形性能而日益受到设计者青睐。面板作为加筋土挡墙的组成部分,对墙体的承载能力影响显著。针对现有设计规范无法考虑面板形式对结构自身力学变形特性的影响,设计并开展了整体式与分块式面板的离心模型试验。数据测试分析显示:整体式面板加载期的位移小于分块式面板位移;由于分块式面板位移较大,所以其水平土压力小于整体式面板土压力;加筋土挡墙面板底部存在应力集中现象;分块式面板筋-土界面的摩擦系数发挥值大于整体式面板数值,但两者均小于设计规范建议值;由于模型筋材长度较长并且连接件的存在,导致原型设计较为保守。
Reinforced soil retaining walls are increasingly favored by designers in civil engineering because of its unique landscape performance and good seismic-resistance performance. As an integral part of the reinforced soil retaining walls, facing has a significant influence on its bearing capacity. In view of the fact that the existing design codes cannot consider the effect of facing form on the mechanical deformation characteristics of the structure itself, centrifuge model tests were carried out on walls with full-height panel facing and blocked facing. The following results are obtained: the displacement of the full-height panel facing is less than that of the blocked facing during the loading period. Since the larger displacement for the model wall with blocked facing, its horizontal earth pressure is smaller; stress concentration occurs at the bottom of the facing of the reinforced soil retaining wall. It is found that the soil-reinforcement friction coefficient for the reinforced soil retaining wall with blocked facing is larger than that in the case of full-height panel facing, while both of them are less than the recommended values from the design codes. The model walls are conservative due to the larger reinforcement length and the use of the anchor connector.
Reinforced soil retaining walls are increasingly favored by designers in civil engineering because of its unique landscape performance and good seismic-resistance performance. As an integral part of the reinforced soil retaining walls, facing has a significant influence on its bearing capacity. In view of the fact that the existing design codes cannot consider the effect of facing form on the mechanical deformation characteristics of the structure itself, centrifuge model tests were carried out on walls with full-height panel facing and blocked facing. The following results are obtained: the displacement of the full-height panel facing is less than that of the blocked facing during the loading period. Since the larger displacement for the model wall with blocked facing, its horizontal earth pressure is smaller; stress concentration occurs at the bottom of the facing of the reinforced soil retaining wall. It is found that the soil-reinforcement friction coefficient for the reinforced soil retaining wall with blocked facing is larger than that in the case of full-height panel facing, while both of them are less than the recommended values from the design codes. The model walls are conservative due to the larger reinforcement length and the use of the anchor connector.
引文
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[14]李浩,罗强,张良,等.衡重式加筋土路肩挡墙土工离心模型试验研究[J].岩土工程学报,2014,36(3):458-465.LI Hao,LUO Qiang,ZHANG Liang,et al.Centrifugal model tests on shoulder balance weight retaining wall with reinforced earth[J].Chinese Journal of Geotechnical Engineering,2014,36(3):458-465.
[2]肖成志,刘波,李雨润,等.加筋黏性土挡墙长期工作性能的试验研究[J].岩土力学,2012,33(1):109-115.XIAO Cheng-zhi,LIU Bo,LI Yu-run,et al.Test study of long-term performance of reinforce cohesion soil retaining wall[J].Rock and Soil Mechanics,2012,33(1):109-115.
[3]邹维列,冷建军,王协群.重力式加筋土挡墙的工作性能和土压力计算[J].岩土力学,2011,32(2):70-75.ZOU Wei-lie,LENG Jian-jun,WANG Xie-qun.Numerical analysis of working properties and soil pressure calculation of geosynthetic-reinforced soil gravity retaining wall[J].Rock and Soil Mechanics,2011,32(2):70-75.
[4]杨明,吴德伦.加筋挡墙侧向变形分析模型[J].土木工程学报,2001,34(5):68-71.YANG Ming,WU De-lun.A model for lateral displacement of reinforced soil retaining wall[J].China Civil Engineering Journal,2001,34(5):68-71.
[5]TATSUOKA F.Recent practice and research of geosynthetic-reinforced earth structures in Japan[J].Journal of Geoengineering,2008,3(3):77-100.
[6]铁道第二勘察设计院.TB10025-2006铁路路基支挡结构设计规范[S].北京:中国铁道出版社,2006.The Second Railway Survey and Design Institute of China Railway.TB 10025-2006 Code for design on retaining engineering structure of railway subgrade[S].Beijing:China Railway Publishing Press,2006.
[7]FHWA-NHI-10-024.Design and constrution of mechanically stabilized earth walls and reinforeced soil slopes-volume1[S].Washington,D.C:Federal Highway Administration and U.S,Department of Transportation,2009.
[8]叶观宝,张振,邢皓枫,等.面板对路堤式加筋土挡墙力学特性的影响[J].岩土力学,2012,33(3):881-886.YE Guan-bao,ZHAGN Zhen,XING Hao-feng,et al.Influence of facing on mechanical behavior of reinforced retaining wall for embankment[J].Rock and Soil Mechanics,2012,33(3):881-886.
[9]TATSUOKA F,TATEYAMA M,MOHRI Y,et al.Remedial treatment of soil structures using geosynthetic-reinforcing technology[J].Geotextiles and Geomembranes,2007,25(4):204-220.
[10]黄茂松,李波,程岳.长短桩组合路堤桩荷载分担规律离心模型试验与数值模拟[J].岩石力学与工程学报,2010,29(12):2543-2550.HUANG Mao-song,LI Bo,CHENG Yue.Centrifuge tests and numerical analysis of nonuniform pile-supported embankments on load sharing ratio[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(12):2543-2550.
[11]NAKAJIMA S.Study on seismic performance of geogrid reinforced soil retaining walls and deformation characteristics of backfill soil[C]//Proceedings of 4th Asian Regional Conference on Geosynthetics.Shanghai:[s.n.],2008.
[12]向科,罗凤.土工离心模型试验中的加筋材料[J].地下空间与工程学报,2007,3(5):889-892.XIANG Ke,LUO Feng.Reinforcing material in centrifugal model test[J].Chinese Journal of Underground Space and Engineering,2007,3(5):889-892.
[13]唐辉明,林彤.三峡工程库区巫山县加筋土挡墙离心模型试验研究[J].岩石力学与工程学报,2004,23(17):2893-2901.TANG Hui-ming,LIN Tong.Centrifuge modeling test on reinforced earth wall at Wushan County in reservoir area of the Three Gorges Project[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(17):2893-2901.
[14]李浩,罗强,张良,等.衡重式加筋土路肩挡墙土工离心模型试验研究[J].岩土工程学报,2014,36(3):458-465.LI Hao,LUO Qiang,ZHANG Liang,et al.Centrifugal model tests on shoulder balance weight retaining wall with reinforced earth[J].Chinese Journal of Geotechnical Engineering,2014,36(3):458-465.