CFG桩复合地基多层加筋垫层力学特性分析

Analysis of the Mechanical Properties of the Multilayer Reinforced Cushion of CFG Pile Composite Foundation

基于弹性理论,建立路堤荷载作用下多层加筋垫层力学模型,提出格栅拉力和多层加筋垫层复合模量计算方法,通过某工程实测数据验证计算方法的合理性;分析格栅层数、位置、铺设间距等因素对格栅拉力的影响。研究结果表明:随着格栅层数的增多,总拉力和底层格栅拉力不断降低;随着底层格栅远离桩顶,格栅总拉力和底层格栅拉力逐渐增大,上层格栅拉力先增大后减小;格栅总拉力和底层格栅拉力随着铺设间距的增大而增大,上层格栅拉力随着铺设间距的增大而减小。

Based on the theory of elasticity,this paper establishes a mechanical analysis model of a multilayer reinforced cushion under embankment load,proposes a calculation method of composite modulus of the grid tension and multilayer reinforced cushion,and verifies the rationality of the calculation method based on the measured data of a project.On this basis,it analyzes the influence of grid layer number,grid position,grid laying spacing and other factors on grid tension.The results of the research show that as the number of grid layers increases,the total grid tension and the tension of the bottom grid decrease;As the bottom grid moves far away from the pile top,the total grid tension and the tension of the bottom grid increase,while the tension of the upper grid increases before decreasing;As the spacing of the grid increases,the total grid tension and the tension of the bottom grid increase,while the tension of the upper grid decreases.