抗滑桩-加筋土挡墙组合支挡结构开发
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摘要
针对山区陡坡地形上加筋土挡墙抗滑稳定性的不足,提出抗滑桩+刚/柔组合墙面加筋土挡墙组合支挡结构,阐述该组合支挡结构的研发思路、结构形式和技术特征。采用有限差分程序FLAC3D建立该组合支挡结构的数值模型,对比分析抗滑桩和抗滑桩+承台2种结构的加筋土挡墙墙面水平位移、抗滑桩位移和桩身弯矩、土工格栅拉力及路基稳定性,重点探讨抗滑桩桩长、覆盖层模量和上覆荷载的影响。研究结果表明:在抗滑桩顶部设置承台可以有效减小墙面和桩身水平位移,提高路基稳定性;将抗滑桩和承台的连接方式由刚接改成铰接会使桩身弯矩显著减小,而对墙面和桩身位移及路基稳定性影响不大;未设置承台时墙面和桩身水平位移更容易受到抗滑桩桩长、覆盖层模量和上覆荷载变化的不利影响。
A combined retaining structure(CRS) composed of anti-slide pile and reinforced earth retaining wall with flexible/rigid facings was proposed to improve the stability of reinforced earth retaining wall constructed on steep terrain of mountainous areas. The development process, structural style, and technical features of CRS were introduced. The finite difference program FLAC3 D was adopted to establish the numerical models of CRS. The horizontal displacement of facing of reinforced earth retaining wall, the displacement and bending moment of anti-slide pile, the tensile force of geogrid and the stability of subgrade of two cases, namely, anti-slide pile only and anti-slide pile connecting with bearing platform, were compared and analyzed. The influence of the length of anti-slide pile, the modulus of overburden and the surcharge load was also intensively explored. The results show that the horizontal displacements of the wall facing and anti-slide pile could be effectively reduced with a bearing platform installed on the anti-slide pile, and the stability of subgrade is also improved. The bending moment of anti-slide pile decreases significantly when the connection between the anti-slide pile and bearing platform is changed from rigidity to a hinge joint, while little effect on the displacements of wall facing and anti-slide pile and the stability of subgrade is obtained. The horizontal displacements of the wall facing and anti-slide pile of the case without bearing platform are easily affected by the variation of the length of anti-slide pile,the modulus of overburden and the surcharge load.
A combined retaining structure(CRS) composed of anti-slide pile and reinforced earth retaining wall with flexible/rigid facings was proposed to improve the stability of reinforced earth retaining wall constructed on steep terrain of mountainous areas. The development process, structural style, and technical features of CRS were introduced. The finite difference program FLAC3 D was adopted to establish the numerical models of CRS. The horizontal displacement of facing of reinforced earth retaining wall, the displacement and bending moment of anti-slide pile, the tensile force of geogrid and the stability of subgrade of two cases, namely, anti-slide pile only and anti-slide pile connecting with bearing platform, were compared and analyzed. The influence of the length of anti-slide pile, the modulus of overburden and the surcharge load was also intensively explored. The results show that the horizontal displacements of the wall facing and anti-slide pile could be effectively reduced with a bearing platform installed on the anti-slide pile, and the stability of subgrade is also improved. The bending moment of anti-slide pile decreases significantly when the connection between the anti-slide pile and bearing platform is changed from rigidity to a hinge joint, while little effect on the displacements of wall facing and anti-slide pile and the stability of subgrade is obtained. The horizontal displacements of the wall facing and anti-slide pile of the case without bearing platform are easily affected by the variation of the length of anti-slide pile,the modulus of overburden and the surcharge load.
引文
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[7]周健,李翠娜,黄金,等.扶壁式加筋土复合挡墙变形规律和受力机理[J].同济大学学报(自然科学版),2015,43(4):529-535.ZHOU Jian,LI Cuina,HUANG Jin,et al.The deformation law and stress mechanism of wrapped-reinforced and counterfort combined retaining wall[J].Journal of Tongji University(Natural Science),2015,43(4):529-535.
[8]徐超,罗玉珊,贾斌,等.短加筋土挡墙墙后连接作用的离心模型试验研究[J].岩土工程学报,2016,38(1):180-186.XU Chao,LUO Yushan,JIA Bin,et al.Effects of connection forms on shored mechanically stabilized earth walls by centrifugal model tests[J].Chinese Journal of Geotechnical Engineering,2016,38(1):180-186.
[9]蒋鑫,刘晋南,黄明星,等.抗滑桩加固斜坡软弱地基路堤的数值模拟[J].岩土力学,2012,33(4):1261-1268.JIANG Xin,LIU Jinnan,HUANG Mingxing,et al.Numerical simulation of embankment on sloped weak ground reinforced by anti-slide piles[J].Rock and Soil Mechanics,2012,33(4):1261-12683.
[10]年廷凯,徐海洋,刘红帅.抗滑桩加固边坡三维数值分析中的几个问题[J].岩土力学,2012,33(8):2521-2526,2535.NIAN Tingkai,XU Haiyang,LIU Hongshuai.Several issues in three-dimensional numerical analysis of slopes reinforced with anti-slide piles[J].Rock and Soil Mechanics,2012,33(8):2521-2526,2535.
[11]王聪聪,李江腾,廖峻,等.抗滑桩加固边坡稳定性分析及其优化[J].中南大学学报(自然科学版),2015,46(1):231-237.WANG Congcong,LI Jiangteng,LIAO Jun,et al.Stability analysis of slope reinforced with piles and optimization[J].Journal of Central South University(Science and Technology),2015,46(1):231-237.
[12]唐晓松,郑颖人,王永甫.加筋土挡墙与抗滑桩联合支挡的分析计算[J].土木建筑与环境工程,2011,33(S2):42-46.TANG Xiaosong,ZHENG Yingren,WANG Yongfu.Analysis and calculation of combined treatment of reinforced earth-retaining wall and anti-slide piles[J].Journal of Civil,Architectural&Environmental Engineering,2011,33(S2):42-46.
[13]薛鹏鹏,郑俊杰,曹文昭,等.加筋土挡墙-抗滑桩组合支挡结构数值模拟研究[J].长江科学院院报,2017,34(2):75-79.XUE Pengpeng,ZHENG Junjie,CAO Wenzhao,et al.Numerical simulation on composite retaining structure composed of reinforced soil retaining wall and anti-slide piles[J].Journal of Yangtze River Scientific Research Institute,2017,34(2):75-79.
[14]TATSUOKA F,TATEYAMA M,MOHRI Y,et al.Remedial treatment of soil structures using geosynthetic-reinforcing technology[J].Geotextiles and Geomembranes,2007,25(4/5):204-220.
[15]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 Jianfeng,LIU Junxiu,SHI Zhenming.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.
[16]曹文昭,郑俊杰,吕思祺,等.一种组合支挡结构:中国,ZL201520758168.9[P].2016-01-06.CAO Wenzhao,ZHENG Junjie,LüSiqi,et al.A combined retaining structure:China,ZL 201520758168.9[P].2016-01-06.
[17]陈华兴.典型陡横坡条件下新型桩墙联合受力结构体系的应用研究[J].公路,2015(10):18-22.CHEN Huaxing.Application and research on joint force of structure system of new pile wall under typical steep slope[J].Highway,2015(10):108-22.
[18]郑俊杰,吴文彪,曹文昭,等.桩基挡墙支挡结构极限状态及稳定性分析[J].华中科技大学学报(自然科学版),2016,44(4):74-78.ZHENG Junjie,WU Wenbiao,CAO Wenzhao,et al.Study on limit state and stability of retaining wall based on anti-slide pile retaining structure[J].Journal of Huazhong University of Science&Technology(Natural Science Edition),2016,44(4):74-78.
[19]JTG D30-2015,公路路基设计规范[S].JTG D30-2015,Specifications for design of highway subgrades[S].
[2]徐光黎,刘丰收,唐辉明.现代加筋土技术理论与工程应用[M].武汉:中国地质大学出版社,2004:1-5.XU Guangli,LIU Fengshou,TANG Huiming.Theory and engineering application of modem reinforced earth technology[M].Wuhan:China University of Geosciences Press,2004:1-5.
[3]张智超,刘汉龙,陈育民.山区公路微型桩-加筋土挡墙系统技术开发[J].中南大学学报(自然科学版),2017,48(7):1849-1857.ZHANG Zhichao,LIU Hanlong,CHEN Yumin.Development of road micropile-MSE wall system in mountainous areas[J].Journal of Central South University(Science and Technology),2017,48(7):1849-1857.
[4]张智超,陈育民,刘汉龙,等.微型桩-加筋土挡墙应力变形特性的多因素分析[J].岩土力学,2017,38(7):1911-1919.ZHANG Zhichao,CHEN Yumin,LIU Hanlong,et al.Multivariate analysis of stress and deformation behavior of micropile-MSE wall[J].Rock and Soil Mechanics,2017,38(7):1911-1919.
[5]BERG R,VULOVA C.Effects of pile driving through a full-height precast concrete panel faced,geogrid-reinforced,mechanically stabilized earth(MSE)wall[C]//Geo-Denver 2007:New Peaks in Geotechnics.Denver,Colorado,2007:1-10.
[6]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.
[7]周健,李翠娜,黄金,等.扶壁式加筋土复合挡墙变形规律和受力机理[J].同济大学学报(自然科学版),2015,43(4):529-535.ZHOU Jian,LI Cuina,HUANG Jin,et al.The deformation law and stress mechanism of wrapped-reinforced and counterfort combined retaining wall[J].Journal of Tongji University(Natural Science),2015,43(4):529-535.
[8]徐超,罗玉珊,贾斌,等.短加筋土挡墙墙后连接作用的离心模型试验研究[J].岩土工程学报,2016,38(1):180-186.XU Chao,LUO Yushan,JIA Bin,et al.Effects of connection forms on shored mechanically stabilized earth walls by centrifugal model tests[J].Chinese Journal of Geotechnical Engineering,2016,38(1):180-186.
[9]蒋鑫,刘晋南,黄明星,等.抗滑桩加固斜坡软弱地基路堤的数值模拟[J].岩土力学,2012,33(4):1261-1268.JIANG Xin,LIU Jinnan,HUANG Mingxing,et al.Numerical simulation of embankment on sloped weak ground reinforced by anti-slide piles[J].Rock and Soil Mechanics,2012,33(4):1261-12683.
[10]年廷凯,徐海洋,刘红帅.抗滑桩加固边坡三维数值分析中的几个问题[J].岩土力学,2012,33(8):2521-2526,2535.NIAN Tingkai,XU Haiyang,LIU Hongshuai.Several issues in three-dimensional numerical analysis of slopes reinforced with anti-slide piles[J].Rock and Soil Mechanics,2012,33(8):2521-2526,2535.
[11]王聪聪,李江腾,廖峻,等.抗滑桩加固边坡稳定性分析及其优化[J].中南大学学报(自然科学版),2015,46(1):231-237.WANG Congcong,LI Jiangteng,LIAO Jun,et al.Stability analysis of slope reinforced with piles and optimization[J].Journal of Central South University(Science and Technology),2015,46(1):231-237.
[12]唐晓松,郑颖人,王永甫.加筋土挡墙与抗滑桩联合支挡的分析计算[J].土木建筑与环境工程,2011,33(S2):42-46.TANG Xiaosong,ZHENG Yingren,WANG Yongfu.Analysis and calculation of combined treatment of reinforced earth-retaining wall and anti-slide piles[J].Journal of Civil,Architectural&Environmental Engineering,2011,33(S2):42-46.
[13]薛鹏鹏,郑俊杰,曹文昭,等.加筋土挡墙-抗滑桩组合支挡结构数值模拟研究[J].长江科学院院报,2017,34(2):75-79.XUE Pengpeng,ZHENG Junjie,CAO Wenzhao,et al.Numerical simulation on composite retaining structure composed of reinforced soil retaining wall and anti-slide piles[J].Journal of Yangtze River Scientific Research Institute,2017,34(2):75-79.
[14]TATSUOKA F,TATEYAMA M,MOHRI Y,et al.Remedial treatment of soil structures using geosynthetic-reinforcing technology[J].Geotextiles and Geomembranes,2007,25(4/5):204-220.
[15]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 Jianfeng,LIU Junxiu,SHI Zhenming.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.
[16]曹文昭,郑俊杰,吕思祺,等.一种组合支挡结构:中国,ZL201520758168.9[P].2016-01-06.CAO Wenzhao,ZHENG Junjie,LüSiqi,et al.A combined retaining structure:China,ZL 201520758168.9[P].2016-01-06.
[17]陈华兴.典型陡横坡条件下新型桩墙联合受力结构体系的应用研究[J].公路,2015(10):18-22.CHEN Huaxing.Application and research on joint force of structure system of new pile wall under typical steep slope[J].Highway,2015(10):108-22.
[18]郑俊杰,吴文彪,曹文昭,等.桩基挡墙支挡结构极限状态及稳定性分析[J].华中科技大学学报(自然科学版),2016,44(4):74-78.ZHENG Junjie,WU Wenbiao,CAO Wenzhao,et al.Study on limit state and stability of retaining wall based on anti-slide pile retaining structure[J].Journal of Huazhong University of Science&Technology(Natural Science Edition),2016,44(4):74-78.
[19]JTG D30-2015,公路路基设计规范[S].JTG D30-2015,Specifications for design of highway subgrades[S].