多级加筋土高挡墙的工程特性及影响因素
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摘要
通过8级加筋土高挡墙工程的现场原位监测,研究多级加筋土高挡墙后土体垂直土压力、墙背侧向土压力以及土工格栅筋材应变分布规律。结果表明:墙后垂直土压力、墙背侧向土压力和筋材应变均与填土高度成正比。墙后垂直土压力沿筋材方向呈非线性分布,最大值均靠近筋材中后部;墙背侧向土压力的增长速率随填土高度的增加而逐渐减小;土工格栅筋材沿筋长方向的应变非常小,且大部分呈双峰值分布,第1个峰值靠近墙面板,第2个峰值远离墙面板。运用PLAXIS2D软件进行多级加筋土高挡墙施工过程的数值模拟,研究筋材长度、间距及填料的内摩擦角对多级加筋土高挡墙水平变形特性的影响。结果表明,筋材的长度和间距对高挡墙水平变形的影响比较显著。
Through the in-situ monitoring of the eight-tiered reinforced soil high retaining wall,the vertical earth pressure behind the wall,the lateral earth pressure on the back of the wall and the strain distribution of geogrid reinforcement were studied.Results showed that the vertical earth pressure behind the wall,the lateral earth pressure on the back of the wall and the strain distribution of reinforcement were proportional to filling height.The vertical earth pressure behind the wall presented a nonlinear distribution along the length of reinforcement,and the maximum values were close to the middle and rear of the reinforcement.The increasing rate of the lateral earth pressure on the back of the wall decreased gradually with the increase of filling height.The strains of geogrid reinforcement along reinforcement length were very small,and most of them showed double-peak distribution.The first peak was near the wall panel,and the second peak was away from it.The effects of reinforcement length,reinforcement spacing and the internal friction angle of filler on the deformation characteristics of the multi-tiered reinforced soil high retaining wall were analyzed in the numerical simulation of the wall construction process with PLAXIS2 Dsoftware.Results show that the length and spacing of reinforcement have significant effects on the horizontal displacement of high retaining wall.
Through the in-situ monitoring of the eight-tiered reinforced soil high retaining wall,the vertical earth pressure behind the wall,the lateral earth pressure on the back of the wall and the strain distribution of geogrid reinforcement were studied.Results showed that the vertical earth pressure behind the wall,the lateral earth pressure on the back of the wall and the strain distribution of reinforcement were proportional to filling height.The vertical earth pressure behind the wall presented a nonlinear distribution along the length of reinforcement,and the maximum values were close to the middle and rear of the reinforcement.The increasing rate of the lateral earth pressure on the back of the wall decreased gradually with the increase of filling height.The strains of geogrid reinforcement along reinforcement length were very small,and most of them showed double-peak distribution.The first peak was near the wall panel,and the second peak was away from it.The effects of reinforcement length,reinforcement spacing and the internal friction angle of filler on the deformation characteristics of the multi-tiered reinforced soil high retaining wall were analyzed in the numerical simulation of the wall construction process with PLAXIS2 Dsoftware.Results show that the length and spacing of reinforcement have significant effects on the horizontal displacement of high retaining wall.
引文
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[13] LIU Huabei,YANG Guangqing,LING HI.Seismic Response of Multi-Tiered Reinforced Soil Retaining Walls[J].Soil Dynamics and Earth Quake Engineering,2014,61/62(6):1-12.
[14] SONG A R,YOO C.Effect of Foundation Yielding on Performance of Two-Tier Geosynthetic-Reinforced Segmental Retaining Walls:a Numerical Investigation[J].Geosynthetics Internationa,2006,13(5):181-194.
[2]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 Xinbo,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.in Chinese)
[3]蒋建清,杨果林.加筋土挡墙地震稳定性分析的水平条分方法[J].中国铁道科学,2009,30(1):36-40.(JIANG Jianqing,YANG Guolin.Horizontal Slice Method for Analyzing the Stability of the Reinforced Retaining Wall under Seismic Load[J].China Railway Science,2009,30(1):36-40.in Chinese)
[4]周亦涛,梁小勇,杨广庆,等.多级加筋土复合式挡墙的现场试验[J].工业建筑,2014,44(2):83-88.(ZHOU Yitao,LIANG Xiaoyong,YANG Guangqing,et al.Field Test of Multistage Reinforced Earth Composite Retaining Wall[J].Industrial Construction,2014,44(2):83-88.in Chinese)
[5]周世良,何光春,汪承志,等.台阶式加筋土挡墙模型试验研究[J].岩土工程学报,2007,29(1):152-156.(ZHOU Shiliang,HE Guangchun,WANG Chengzhi,et al.Study on Stepped Reinforced Soil Retaining Walls by Model Tests[J].Chinese Journal of Geotechnical Engineering,2007,29(1):152-156.in Chinese)
[6]林宇亮,杨果林,李昀,等.加筋土筋材在拉伸荷载作用下的力学特性[J].中国铁道科学,2009,30(5):9-14.(LIN Yuliang,YANG Guolin,LI Yun,et al.The Mechanical Characteristics of the Reinforcements under Tensile Load[J].China Railway Science,2009,30(5):9-14.in Chinese)
[7]周应华,周文洋,万燕.多级加筋土挡墙内力分布及变形规律研究[J].路基工程,2014(5):158-166.(ZHOU Yinghua,ZHOU Wenyang,WAN Yan.Study on Internal Force Distribution and Deformation Rules of Multi-Step Reinforced Soil Retaining Wall[J].Subgrade Engineering,2014(5):158-166.in Chinese)
[8]杨广庆,刘华北,吴连海,等.台阶宽度对加筋土挡墙垂直应力的影响研究[J].岩石力学与工程学报,2016,35(1):209-216.(YANG Guangqing,LIU Huabei,WU Lianhai,et al.Effect of Offset Distance on Vertical Stresses in Geosynthetics Reinforced Soil Retaining Wall[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(1):209-216.in Chinese)
[9]王龙飞,陈浩,程瑞志,等.多级土工格室柔性挡墙变形特性数值模拟[J].路基工程,2015,181(4):176-179.(WANG Longfei,CHEN Hao,CHENG Ruizhi,et al.Numerical Simulation on Deformation Behavior of Multilevel Geocell Flexible Retaining Wall[J].Subgrade Engineering,2015,181(4):176-179.in Chinese)
[10] YANG Guangqing,LIU Huabei,ZHOU Yitao,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.
[11] YOO C,KIM S B.Performance of a Two-Tier Geosynthetic Reinforced Segmental Retaining Wall under a Surcharge Load Full-Scale Load Test and 3DFinite Element Analysis[J].Geotextiles and Geomembranes,2008,26(6):460-472.
[12] YOO C,JUNG H S.Measured Behavior of a Geosynthetic-Reinforced Segmental Retaining Wall in a Tiered Configuration[J].Geotextiles and Geomembranes,2004,22(6):359-376.
[13] LIU Huabei,YANG Guangqing,LING HI.Seismic Response of Multi-Tiered Reinforced Soil Retaining Walls[J].Soil Dynamics and Earth Quake Engineering,2014,61/62(6):1-12.
[14] SONG A R,YOO C.Effect of Foundation Yielding on Performance of Two-Tier Geosynthetic-Reinforced Segmental Retaining Walls:a Numerical Investigation[J].Geosynthetics Internationa,2006,13(5):181-194.