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)
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.
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.
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2016, Vol. 35 
