Reinforced Cushion Bearing Mechanism And Engineering Applications

With the development of the geosynthetic, geosynthetic has been widely used in civil engineer. With the application of the geosynthetic, the theory research and design method of the geosynthetic reinforcement layer have been improved, but the mechanism research of the geosynthetic reinforcement layer is not perfect, the design and calculation of the geosynthetic reinforcement layer has no mature method, it affects the application of the geosynthetic reinforcement layer widely. Basing on the history research of the predecessor, this paper studied the choise of geosynthetic,the calculation of the stress diffusion angle and the calculation of the bearing capacity of the geosynthetic reinforcement layer, key results of the study can be summaried as follows: 1.In design of the geosynthetic reinforcement layer, the effect of geosynthetic parameters (such as geosynthetic space: h , geosynthetic width : b, the embedded depth of the first geosynthetic: u , total numbers of geosynthetic reinforcement layer: N et al.) has no clarity, the design of the geosynthetic reinforcement layer sometimes depends on experience. This paper studied the bearing capability and deformation property of foundation of the geosynthetic reinforcement layer using finite element analysis, results indicate geosynthetic factors exist optimal value: N=3, h=0.2~0.25B, u=0.25B, b=5B. 2.The calculation of the stress diffusion angle is very important in design of the geosynthetic reinforcement layer, but there is no method in common till now. This paper firstly used additional stress back-analysis and orthogonal regression analysis to acquire the calculation formula of the stress diffusion angle, and then studying geosynthetic parameters and cushion properties on the stress diffusion angle. In addition, through the orthogonal regression analysis, results indicate geosynthetic spacing has a most effect on the stress diffusion angle of the geosynthetic reinforcement layer, secondly the embedded depth of the first geosynthetic, however, geosynthetic width has a slight effect on the stress diffusion angle. 3.This paper concludes the trial research results of the predecessor, gaining the failure form of foundation of the geosynthetic reinforcement layer, then adopting limit equilibrium theory to get the bearing capacity formula of the geosynthetic reinforcement layer, and then comparing the calculation results of the improving Terzaghi bearing capacity formula,limit analysis method of Wang Zhao,the finite element method and the bearing capacity formula of this paper, results indicate the bearing capacity formula of this paper can reflect the geosynthetic mechanism of the geosynthetic reinforcement layer,so this formula can offer theorical guidance for the bearing capacity calculation of foundation of the geosynthetic reinforcement layer. 4.This paper studied the performance of bearing capacity and deformation property of soil-rock composite subgrade improving with the geosynthetic reinforcement layer, results indicate the geosynthetic reinforcement layer can easily deal with soil-rock composite subgrade, improving the stress field and displacement field of the foundation, sharing the stress distribution, decreasing the uneven settlement,improving the performance of bearing capacity of the geosynthetic reinforcement layer.