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| Numerical simulation of reinforced soil walls with flexible/rigid facings on yielding foundation |
| CHEN Jianfeng1，LIU Junxiu2，SHI Zhenming1 |
| (1. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；
2. School of Civil Engineering，Anhui Jianzhu University，Hefei，Anhui 230601，China) |
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Abstract Based on the centrifuge modelling of a reinforced soil retaining wall(RSW) with flexible/rigid facings on yielding foundation，an elaborated three-dimensional finite difference numerical model was established to investigate the behaviour and bearing mechanism of the wall under uniform surcharges on top. The numerical results agreed with the centrifuge modelling，showing that the RSWs with flexible/rigid facings have good bearing properties and can adapt to the large deformation of the yielding foundation. The deformation increments and the bearing properties of the structures are closely related to the location of the inner potential slip surface in the fill. When the potential slip surface cuts behind the anchor embedment，the function of the anchors decreases，leading to the apparent increase of wall deformation increment，reinforcement load increment and differential settlement，but leading to the decrease of the lateral earth pressures acting on the back of rigid facing and the embedded anchor loads. Due to the tension membrane effect，the load forces of the reinforcement directly on top the anchors are larger compared to the reinforcement with no anchors below. The lateral earth pressures caused by the surcharge loading can be calculated with the Rankine?s active earth pressure theory. In practice，the embedded anchors can be designed to bear more lateral earth pressures.
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| [1] WU J T H，LEE K Z Z，PHAM T. Allowable bearing pressures of bridge sills on GRS abutments with flexible facing[J]. Journal of Geotechnical and Geoenvironmental Engineering，2006，132(7)：830–841.
[2] LEE K Z Z，WU J T H. A synthesis of case histories on GRS bridge-supporting structures with flexible facing[J]. Geotextiles and Geomembranes，2004，22(4)：181–204.
[3] TATSUOKA F，TATEYAMA M，UCHIMURA T，et al. Geosynthetic reinforced soil retaining walls as important permanent structures[J]. Geosynthetics International，1997，4(2)，81–136.
[4] 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.
[5] BLOOMFIELD R A，SOLIMAN A F，ABRAHAM A. Performance of mechanically stabilized earth walls over compressible soils[C]// Ochiai ed. Landmarks in Earth Reinforcement. [S.l.]：A. A. Balkema，2001：317–322.
[6] ALFARO M C，HAYASHI S，MIURA N，et al. Deformation of reinforced soil wall/embankment system on soft clay foundation[J]. Soils and Foundations，1997，37(4)：33–46.
[7] ROWE R K，SKINNER G D. Numerical analysis of geosynthetic reinforced retaining wall constructed on a layered soil foundation[J]. Geotextiles and Geomembranes，2001，19(7)：387–412.
[8] SKINNER G D，ROWE R K. Design and behaviour of a geosynthetic reinforced retaining wall and bridge abutment on a yielding foundation[J]. Geotextiles and Geomembranes，2005，23(3)：234–260.
[9] VISWANADHAM B V S，KONIG D. Centrifuge modeling of geotextile-reinforced slopes subjected to differential settlements[J]. Geotextiles and Geomembranes，2008，27(2)：77–88.
[10] TANCHAISAWAT T，BERGADO D T，VOOTTIPRUEX P. Numerical simulation and sensitivity analysis of full-scale test embankment with reinforced lightweight geomaterials on soft Bangkok clay[J]. Geotextiles and Geomembranes，2008，26(6)：498–511.
[11] HUANG C C，LUO W M. Behavior of cantilever and geosynthetic- reinforced walls on deformable foundations[J]. Geotextiles and Geomembranes，2010，28(5)：448–459.
[12] 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)：1 928–1 935.(CHEN Jianfeng，LIU Junxiu，SHI Zhenming. Numerical simulation and stability discussion of a reinforced soil wall on soft soil foundation[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(9)：1 928–1 935.(in Chinese))
[13] XUE J F，CHEN J F，LIU J X，et al. Instability of a geogrid reinforced soil wall on thick soft Shanghai clay with prefabricated vertical drains：a case study[J]. Geotextiles and Geomembranes，2014，42(4)：302–311.
[14] 陈建峰，柳军修，薛剑峰. 刚/柔性组合墙面加筋土挡墙工作性状离心模型试验[J]. 同济大学学报：自然科学版，2014，42(12)：1 805–1 811.(CHEN Jianfeng，LIU Junxiu，XUE Jianfeng. Centrifugal test on a reinforced soil wall with flexible/rigid facings[J]. Journal of Tongji University：Natural Science，2014，42(12)：1 805–1 811.(in Chinese))
[15] Itasca Consulting Group，Inc.. Fast Lagrangian analysis of continua in 3 dimensions，version 3.0，user?s manual[R]. Minneapolis，USA：Itasca Consulting Group，Inc.，2002.
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2016, Vol. 35 
