In order to promote application of assembled retaining walls in support of slopes,a new type of assembled concrete retaining wall is designed,in which type A and type B assembled retaining walls are further classified.The retaining wall is assem-bled from solid concrete precast blocks,and the precast blocks are connected by mortise and cement mortar.Precast holes are left among prefabricated blocks of type A,and these holes will be grouted with bars inserted after the assembly is completed,and retai-ning wall B is assembled by the precast blocks without precast holes.We carried out field trials on assembled concrete retaining walls,studied the overall deformation of the retaining wall and the local deformation of the upper and lower precast block joints,and verified reliability of tongue and groove and cement mortar bonding.Through the tests,we reveal the displacement pattern and earth pressure distribution law of the retaining wall,and obtain the active and deforming earth pressure calculation formula of this assembled retaining wall by correcting the Coulomb active earth pressure.The main conclusions are given below:the connection between the mortise structure and cement mortar is reliable,no relative rotation is generated between precast blocks of retaining wall A,and there is only slight relative rotation between precast blocks of retaining wall B under maximum overload,that the upper precast blocks rotates outward around the lower one.The insertion of bars and the filling of cement mortar in the precast holes can enhance the connectivity between the precast blocks and improve the stiffness of the retaining wall.Under the action of overload,the whole retaining wall rotates around the center of the foundation.When the overload is 45 kPa and the horizontal displacement of the top of the retaining wall displacement is 0.23％H(H is the height of the retaining wall),the filling soil behind the wall reaches the active limit state with the earth pressure in a nonlinear distribution.We proposed a formula for calculating active earth pressure when the overload is less than 45kPa,and the relationship between earth pressure and displacement of retaining wall is given.The novel assembled concrete retaining wall has good bearing performance and can be applied and popularized.The re-search results can provide a basis for the design and popularization of this new type of assembled retaining wall.
关键词
装配式挡土墙/土压力/混凝土预制块/现场试验/受力变形/位移模式
Key words
assembled retaining wall/soil pressure/precast concrete blocks/field test/deformation under force/displacement mode
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