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Reinforced soil due to saving labor, material saving, convenient construction, fast, etc., are widely used. Reinforced soil geotechnical structures such as retaining walls, slope and foundation laying into the geosynthetics, reinforced and reinforced material, in order to reduce the earth pressure increase slope stability, improve the bearing capacity of a technology . Limit equilibrium methods are used in the design of reinforced earth method. Limit equilibrium method is simple, convenient solution with rigorous solution size, the relationship is not clear, but only meet the material constitutive relation. Principle for the stability analysis of geotechnical structures, such as the limit analysis upper bound method and the lower limit of the method, the finite element method and the slip-line method can be used in the stability analysis of reinforced soil structures. Where the upper bound method and limit equilibrium method application is simple, but to meet the material constitutive relations, displacement compatibility and boundary conditions, so clear and the resulting solution with strict solution size, at the same time, the resulting solution to the analytical expression of the form given. It can be said that the upper bound method is a simple and effective method. Firstly, collate and summarize the upper bound limit analysis of two ideas in the application of stability analysis of reinforced soil structures called internal force exercises and quasi cohesive force method. Internal force exercises focus on the method of calculation of the internal force power sliding surface reinforcement quasi cohesion rule reinforced sand be deemed to have prime soil cohesion, the direct application of the ceiling Method. At present, the internal forces of the upper limit of the application of the power law law are based on the traditional limit analysis method. Ceiling solution that traditional limit analysis of rigid body moving with speed V and still rigid body into ν corner expansion, dilation angle ν and internal friction angle φ equal, and do not reflect the friction characteristics of the material resulting in the calculation of the internal forces of power consumed by soil . Generalized plasticity theory is that between the rigid body moving and stationary rigid body shear dilatancy angle φ / 2, resulting in the calculation of internal forces of power can clearly reflects the friction characteristics of geomaterials. In this paper, the summary of the proposed internal force exercises based on the upper bound method based on generalized plasticity theory application to power calculation method of Yang Junjie internal forces, and made the calculation of the internal forces of power, then, by solving the critical height of reinforced slopes, compared Yang Junjie method based on traditional and generalized plasticity theory, Radoslaw LM method of calculation results and the centrifuge test results. For quasi-cohesive force method, the paper analyzes the of Liu vertical far reinforced sand and clay reinforced triaxial test results, comparison tests cohesion and calculated quasi cohesion principle, cohesion, and got quasi cohesion principle can be used for the conclusion of clay reinforced structures and verified by an example. In this study, enrich and develop the design and theory of reinforced earth.
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