Abstract Understanding the frost-induced pipe-soil interaction is very important to address the problem of damage to buried pipelines caused by frost heaving. Herein, a frost heaving experiment was designed to investigate the mechanism of interaction between a buried pipe and frozen soil. Based on the data collected using various sensors, the variations of the soil parameters (such as temperature, water content, soil pressure, and frost heave) and the distributions of the deformation and stress of the pipe were analyzed. Furthermore, the checking calculation of the pipe stress was carried out. The experimental results show that the interaction between the pipe and the soil under frost heaving is a process of coordinated development of various forces and deformations. The pipe is deformed by frost heaving of the soil while the pipe itself restrains the frost heaving. There is a state of dynamic equilibrium between the pipe and the soil. The uneven changes in the internal properties of the soil are related to the restraint of the pipe. For the soil closer to the pipe, when the pipe deformation is small, the pipe restraint on the frost heaving is stronger, the frost heaving force is larger, and the frost heaving is smaller. In addition, the axial stress of a pipe caused by frost heaving can be calculated approximately by the method of bending stress analysis of a beam. The influence of cross-sectional deformation should be considered in the stability calculation of the pipe when the pipe is subjected to large loads. The experimental results can be used as a theoretical reference for pipeline designs in permafrost regions, particularly in the calculation of pipe strength and selection of pipe material.

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冻结过程中埋管与土体力学相互作用的试验研究

摘要 了解冻胀管土相互作用对于解决冻胀引起的埋地管道损坏问题非常重要。在此，设计了冻胀实验来研究埋地管道与冻土之间的相互作用机制。基于各种传感器采集的数据，分析了土体参数（如温度、含水量、土压力、冻胀等）的变化以及管道变形和应力的分布情况。此外，还进行了管道应力的校核计算。试验结果表明，冻胀作用下管道与土体的相互作用是一个各种力和变形协调发展的过程。管道因土壤冻胀而变形，而管道本身抑制冻胀。管道与土壤之间存在动态平衡状态。土体内部性质的不均匀变化与管道的约束有关。对于靠近管道的土壤，当管道变形较小时，管道对冻胀的约束较强，冻胀力较大，冻胀较小。此外，冻胀引起的管道轴向应力可以通过梁的弯曲应力分析方法近似计算。管道承受大载荷时，在进行稳定性计算时，应考虑截面变形的影响。