Numerical Simulation of Loess Filled Subgrade Reinforced with Bamboo Grids in High and Steep Gullies
Bamboo grid is a new type of reinforcement material,which is superior to traditional reinforcement materials such as geogrid due to its characteristics of high strength and environment-friendliness.The ABAQUS 3D modeling and calculation,the reinforcement effect and its influencing factors are studied regarding the bamboo grids set at the interface between the fill and the undisturbed soil of the filled subgrade in high and steep gullies.The results of ABAQUS simulation show that the maximum differential settlement and the maximum lateral displacement of the interface are both located at the top of the subgrade;after reinforced with bamboo grids at the interface,the differential settlement and the lateral displacement of the interface is significantly reduced compared with that without reinforcement;compared with the middle scheme and the bottom scheme,the scheme of setting bamboo grids in the upper part of the subgrade is the best,in which the reduction of differential settlement at the interface is the largest;there is an optimal reinforcement spacing for the bamboo grids,because the reinforcement effect increases with the spacing becoming dense,but the effect improves not obviously when the spacing is too dense.In the practice of projects,the bamboo grids can only be laid in the upper part of the subgrade,and the optimal spacing for the bamboo grids should be selected.
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