The mechanism of the soil-structure interaction in buried corrugated metal pipes (CMPs) depends primarily on the relative stiffness of the flexible buried pipe and the surrounding compacted backfill material. Several geometric, mechanical, and material characteristics control this complex composite interaction, including the shape and dimensions of the pipe, its burial depth, the effect of the backfill compaction, and existing in-situ conditions. Numerical techniques such as the finite element method (FEM) have proved useful in capturing the soil-structure interaction. This paper presents three rigorous three-dimensional finite element models of circular, horizontal ellipse, and arch pipes with spans of 600 mm, 1800 mm, and 6000 mm, respectively. The models developed account for the effect of compaction on the soil behaviour. These models were validated by using three full-scale tests of underground CMPs. The FEM results are compared with recorded measurements of deformation and internal forces in each pipe structure. The effectiveness and suitability of three commonly used constitutive soil models, the Mohr-Coulomb (MC) model, the hardening soil (HS) model, and the hardening soil with small strains (HSs) model, are also examined. The HSs model exhibited the best fit in simulating the interaction of the backfill soil and buried pipes with different types of loading.

埋入式波纹金属管（CMP）中土壤与结构相互作用的机制主要取决于柔性埋入式管道和周围压实回填材料的相对刚度。几种复杂的几何，机械和材料特性控制着这种复杂的复合相互作用，包括管道的形状和尺寸，埋入深度，回填压实的影响以及现有的现场条件。诸如有限元方法（FEM）之类的数字技术已被证明对捕获土壤-结构相互作用是有用的。本文介绍了三个严格的三维有限元模型，分别是跨度分别为600 mm，1800 mm和6000 mm的圆形，水平椭圆形和拱形管。开发的模型考虑了压实对土壤特性的影响。通过使用地下CMP的三个全面测试对这些模型进行了验证。将有限元结果与记录的每个管道结构的变形和内力测量结果进行比较。还检查了三种常用的本构土壤模型（Mohr-Coulomb（MC）模型，硬化土（HS）模型和小应变硬化土（HSs）模型）的有效性和适用性。HSs模型在模拟回填土和埋管在不同荷载类型下的相互作用时表现出最佳拟合。还研究了硬化土（HS）模型和小应变硬化土（HSs）模型。HSs模型在模拟回填土和埋管在不同荷载类型下的相互作用时表现出最佳拟合。还研究了硬化土（HS）模型和小应变硬化土（HSs）模型。HSs模型在模拟回填土和埋管在不同荷载类型下的相互作用时表现出最佳拟合。