软土地基上加筋土挡墙变形特征的有限元分析
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摘要
针对在加筋土挡墙设计中,一般不考虑地基变形影响,而软土地基过大变形会造成加筋土挡墙失效的问题,结合某加筋土挡墙实例,利用数值模拟方法建立了软土地基上加筋土挡墙数值模型,分析了软土地基不均匀变形对加筋土挡墙的影响。结果表明:由于加筋土挡墙基底压力的偏心作用,会引起软土地基的差异沉降,对墙体侧向变形及向临空面倾覆有不利影响;加筋土挡墙面板变形主要是由地基不均匀沉降引起的;加筋土挡墙地基的沉降曲线近似线性,面板下地基沉降量最大。参数分析还揭示,地基土的杨氏模量和面板仰角、回填土特性等对加筋土挡墙变形特征均存在较大影响。
Generally,the impact of foundation deformation has been not taken into account in the design of the reinforced retaining walls.However,tremendous deformation of the soft foundation may cause their failure.Based on the practice of a reinforced retaining wall,a model for the reinforced retaining wall on the soft foundation is established by means of numerical modeling method.The impact of differential deformation of the soft foundation on the reinforced retaining wall is analyzed.The results show that:(1) the eccentric action of the base pressure of the reinforced retaining wall will lead to the differential settlement of the soft foundation,and thus it results in adverse impact on the wall deformation and the failure of the free face;(2) the deformation of the face of the reinforced retaining wall is mainly caused by the differential settlement of the soft foundation;(3) the settlement curve of the foundation with the reinforced retaining wall is nearly linear,and the largest settlement point is under the face.The parametric analysis also indicates that the Young's modulus and face angle of the foundation soils and the characteristics of the backfill also have great impact on the deformation characteristics of the reinforced retaining wall.
Generally,the impact of foundation deformation has been not taken into account in the design of the reinforced retaining walls.However,tremendous deformation of the soft foundation may cause their failure.Based on the practice of a reinforced retaining wall,a model for the reinforced retaining wall on the soft foundation is established by means of numerical modeling method.The impact of differential deformation of the soft foundation on the reinforced retaining wall is analyzed.The results show that:(1) the eccentric action of the base pressure of the reinforced retaining wall will lead to the differential settlement of the soft foundation,and thus it results in adverse impact on the wall deformation and the failure of the free face;(2) the deformation of the face of the reinforced retaining wall is mainly caused by the differential settlement of the soft foundation;(3) the settlement curve of the foundation with the reinforced retaining wall is nearly linear,and the largest settlement point is under the face.The parametric analysis also indicates that the Young's modulus and face angle of the foundation soils and the characteristics of the backfill also have great impact on the deformation characteristics of the reinforced retaining wall.
引文
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[12]李志清,胡瑞林,付伟,等.土工格栅在加固高速公路路堤中的应用研究[J].岩土力学,2008,29(3):795-799.
[13]TANCHAISAWATT,BERGADO D T,VOOTTIPRUEX P.2Dand 3D simulation of geogrid-reinforced geocomposite materialembankment on soft Bangkok clay[J].GeosyntheticsInternational,2009,16(6):420-432.
[14]ALGIN H M.Settlement analysis ofgeosynthetic reinforced soilretaining walls at foundation level[J].The Electronic Journalof Geotechnical Engineering,2010,15:697-712.
[15]魏丽敏,张军乐,何群.差异沉降下加筋土挡土墙筋带变形特性试验研究[J].湖南科技大学学报:自然科学版,2005,20(1):45-48.
[16]SONG Ya-kun,ZHENG Ying-ren,TANG Xiao-song,et al.Study on the FEM design of reinforced earth retaining wallwith geogrid[J].Engineering Sciences,2010,28(3):71-80.
[2]贺会团,蒋丽霞.基于变形控制的加筋土挡墙设计方法[J].水运工程,2010(8):24-29.
[3]HELWANYA S M B,REARDON G,WU J T H.Effects ofbackfill on the performance of GRS retaining walls[J].Geotextiles and Geomembranes,1999,17(1):1-16.
[4]KERRY R R,SKINNER G D.Numerical analysis ofgeosynthetic reinforced retaining wall constructed on a layeredsoil foundation[J].Geotextiles and geomembranes,2001,19(9):387-412.
[5]王向余,刘华北,宋二祥.地震类型对加筋土挡土墙长期蠕变后动力响应的影响[J].河海大学学报:自然科学版,2011,39(5):528-535.
[6]周春儿,何光春,龙丽吉.台阶式土工格栅加筋土挡墙结构优化设计[J].河海大学学报:自然科学版,2008,36(5):713-717.
[7]吴景海,王德群,陈环.土工合成材料加筋砂土三轴试验研究[J].岩土工程学报,2000,22(2):199-204.
[8]王钊,李丽华,王协群.土工合成材料的蠕变特性和试验方法[J].岩土力学,2004,25(5):723-727.
[9]张军乐,华祖,魏丽敏.高加筋土挡墙设计中的若干问题[J].路基工程,2000(5):12-15.
[10]徐超,赵春风,叶观宝.关于土与土工合成材料界面的试验研究[J].同济大学学报:自然科学版,2004,32(3):307-311.
[11]杨广庆,周亦涛,周乔勇,薛晓辉.土工格栅加筋土挡墙试验研究[J].岩土力学,2009,30(1):206-210.
[12]李志清,胡瑞林,付伟,等.土工格栅在加固高速公路路堤中的应用研究[J].岩土力学,2008,29(3):795-799.
[13]TANCHAISAWATT,BERGADO D T,VOOTTIPRUEX P.2Dand 3D simulation of geogrid-reinforced geocomposite materialembankment on soft Bangkok clay[J].GeosyntheticsInternational,2009,16(6):420-432.
[14]ALGIN H M.Settlement analysis ofgeosynthetic reinforced soilretaining walls at foundation level[J].The Electronic Journalof Geotechnical Engineering,2010,15:697-712.
[15]魏丽敏,张军乐,何群.差异沉降下加筋土挡土墙筋带变形特性试验研究[J].湖南科技大学学报:自然科学版,2005,20(1):45-48.
[16]SONG Ya-kun,ZHENG Ying-ren,TANG Xiao-song,et al.Study on the FEM design of reinforced earth retaining wallwith geogrid[J].Engineering Sciences,2010,28(3):71-80.
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