背向沉管下沟管道应力计算解析模型及验证

doi:10.6040/j.issn.1672-3961.0.2025.079

摘要/Abstract

摘要： 考虑沉管下沟过程中的管土耦合作用,基于弹性地基梁理论,通过运用挠曲线方程与变形协调条件,构建背向沉管下沟管道应力解析模型。为验证解析模型的准确性,利用ABAQUS建立考虑土体塑性本构关系的有限元模型进行对比分析。对比规范模型、解析模型及有限元模型关于拱起管段长度、悬空管段长度、管道最大应力及最大弯矩等参数的结果可知,解析模型与有限元模型的误差分别为3.58%、3.50%、4.89%和3.52%,而规范模型与有限元模拟的误差最大可达13.40%。结果表明,管道下沟过程中,最大应力首先出现在沉管中间位置处,开挖80 m后出现在管沟开挖端部;在接触沟底前,管道出现3个应力集中点,在接触沟底后,管道出现4个应力集中点。这种基于相互作用机理的建模方法能够更准确地表征管道-土体系统的力学响应特性,从工程实践角度而言,该模型的建立显著提升了管道系统力学分析的精度,对保障长输管道的结构完整性和运行安全性具有重要的工程应用价值。

关键词: 背向沉管, 应力分析, 解析模型, 数值验证

Abstract: The coupling effect between the pipe and soil was considered during the process of sinking the pipe into the trench. Based on the theory of elastic foundation beams, a stress analysis model for the pipeline under the back sinking pipe into the trench was constructed using the deflection curve equation and deformation coordination conditions. To verify the accuracy of the analytical model, a finite element model considering the plastic constitutive relationship of soil was established with Abaqus for comparative analysis. When the results of the standard model, analytical model, and finite element model were compared on parameters(length of the arch section, length of the suspended section, maximum stress, and bending moment of the pipeline), the errors between the analytical model and the finite element model were found to be 3.58%, 3.50%, 4.89%, and 3.52%, respectively. Meanwhile, the maximum error between the standard model and the finite element model was observed to reach 13.40%.The results showed that during the lowering of the pipeline into the trench, the maximum stress first occurred at the middle position of the immersed tube. After 80 m of excavation, it appeared at the end of the trench excavation. Before contact with the trench bottom was made, three stress concentration points were identified in the pipeline. After contact with the trench bottom was established, four stress concentration points were observed in the pipeline.This modeling method, based on the interaction mechanism, was demonstrated to more accurately characterize the mechanical response characteristics of the pipeline-soil system. From an engineering practice perspective, the model was confirmed to significantly improve the accuracy of pipeline system mechanical analysis. It is considered to hold important engineering application value for ensuring the structural integrity and operational safety of long-distance pipelines.

Key words: reverse immersed tube, stress analysis, analytical model, numerical validation

中图分类号:

TU991.05

山丽洁,张立松,杨清纯,李龙生,赵新波. 背向沉管下沟管道应力计算解析模型及验证[J]. 山东大学学报 (工学版), 2026, 56(2): 112-120.

SHAN Lijie, ZHANG Lisong, YANG Qingchun, LI Longsheng, ZHAO Xinbo. Analytical model and verification of stress calculation for backward immersed pipe in ditch[J]. Journal of Shandong University(Engineering Science), 2026, 56(2): 112-120.

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