Centrifuge Model Tests of Behavior of Masonry and Reinforced Soil Composite Retaining Wall

Abstract:

Taking amasonryand reinforced soil composite retaining wall of Hubei Shifang(Shiyan to Fangxian) Expressway as the research object, using the geotechnical centrifuge model test, the deformation characteristics and the soil pressure distribution of the combined retaining wall was studied, and the effects of reinforcement modulus, length and vertical spacing of reinforcement on the composite retaining wall was investigated. It is found out that the lower masonry retaining wall and the upper reinforced earth retaining wall have obvious mutual influences, the introversion of masonry retaining wall occurs under the load of upper reinforced soil wall, and the introversion of masonry wall further increases the horizontal displacement of the upper part of reinforced soil retaining wall and makes the pressure distribution more uneven at the bottom. Increasing the geogrid modulus, increasing reinforced length and reducing reinforcement spacing are more conducive to the control of the deformation of reinforced soil retaining wall. The earth pressure in reinforced soil and the horizontal earth pressure behind retaining wall, which are impacted by reinforced parameters, are smaller than the theoretical value. The wall top settlement of composite retaining wall occurs mainly in the construction period, and measures should be taken to strengthen the construction quality control and ensure the compactness of soil.