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围海造陆逐渐成为沿海地区解决港口建设用地的主要途径之一。目前对于围海造陆港口吹填地基在集装箱荷载下工作区深度的研究鲜有报道。通过现场足尺试验研究了港口地基中附加应力及地基回弹模量的变化规律,试验结果表明:3层集装箱加载工况下附加应力与自重应力比等于0.2和0.1的深度分别为1.80,2.60 m;地基回弹模量随砂垫层厚度增加而增加,砂垫层较薄时地基回弹模量值较离散。随后,采用FLAC3D建立数值分析模型,其中铺面结构采用理想弹性模型,地基采用M-C模型。模拟中对不同集装箱层数加载工况和不同砂垫层厚度工况下,地基中的附加应力、竖向应变及侧向位移等参数进行了系统分析。
Land reclamation by the sea has gradually become one of the major ways to solve the problem of port construction in coastal areas. At present, there is little research on the depth of work area under the load of reclaimed land for land reclamation in reclaimed land. The results show that the depths of additional stress and self-weight stress ratio of 0.2 and 0.1 under three-tier container loading conditions are 1.80 and 2.60 respectively m. The rebound modulus of the foundation increases with the thickness of the sand cushion, while the value of the subgrade rebound modulus is thinner when the sand cushion is thinner. Subsequently, FLAC3D was used to establish the numerical analysis model, in which the ideal elastic model of the pavement structure and the M-C model of the foundation were used. In the simulation, the parameters of different stresses, vertical strains and lateral displacements in the ground under different loading conditions of different stratums and different thickness of sand cushion were systematically analyzed.