软硬交界沉降下玻璃钢管破坏机理研究

张锋; 魏松林; 桂春; 周能华; 郑仔豪

doi:10.7643/issn.1672-9242.2026.06.016

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装备环境工程 ›› 2026, Vol. 23 ›› Issue (6) : 177-186. DOI: 10.7643/issn.1672-9242.2026.06.016

重大工程装备

软硬交界沉降下玻璃钢管破坏机理研究

张锋, 魏松林^*, 桂春, 周能华, 郑仔豪

作者信息 +

Failure Mechanism of Fiberglass Reinforced Plastic Mortar Pipes under Soft Hard Interface Settlement

ZHANG Feng, WEI Songlin^*, GUI Chun, ZHOU Nenghua, ZHENG Zihao

Author information +

文章历史 +

摘要

目的研究不同工况下玻璃钢夹砂管应力的影响规律,为玻璃钢夹砂管道在复杂土体条件下的工程应用提供一定的理论支撑。方法基于玻璃钢夹砂管各向异性材料特性,建立了相应的玻璃钢夹砂管道模型,并与四点弯曲试验结果进行对比,验证了模型的准确性。考虑材料非线性和接触非线性建立了管土精细化三维有限元模型,针对软硬交界面工况,研究了不同直径玻璃钢夹砂管道在不同土体沉降量下的应力演变规律。结果玻璃钢夹砂管的失效模式主要表现为纵向弯曲变形引起的拉伸破坏,其中管道顶部受拉,底部受压,弯曲导致管道的拉应力超过管材极限抗拉强度而失效。沉降作用下,在软硬交界面工况下管道失效时的极限土体位移为0.03274m,相比无软硬交界面时减少了65.9%。结论软硬交界面下,管道的力学响应受地基刚度突变影响,管径变化对极限土体沉降量影响不显著。

Abstract

The work aims to investigate the stress response characteristics of glass fiber reinforced plastics mortar (GFRPM) pipes under different working conditions, providing theoretical support for their engineering application in complex soil environments. Based on the anisotropic material characteristics of GFRPM pipes, a corresponding numerical model was established and validated through comparison with the results of a four-point bending test. Considering both material nonlinearity and contact nonlinearity, a refined three-dimensional pipe-soil finite element model was developed. Under soft-hard soil interface conditions, the stress evolution characteristics of GFRPM pipes with different diameters under various soil settlement levels were investigated. The failure mode of GFRPM pipeswas mainly characterized by tensile failure induced by longitudinal bending deformation, in which the pipe crown was subjected to tension while the invert was subjected to compression. The bending deformation caused the tensile stress of the pipe to exceed the ultimate tensile strength of the pipe material, resulting in structural failure. Under settlement conditions, the ultimate soil displacement corresponding to pipe failure under the soft-hard soil interface condition was 0.03274 m, which was 65.9% lower than that without the soft-hard soil interface. Under the soft-hard soil interface condition, the mechanical response of the pipe is significantly affected by the abrupt change in foundation stiffness, while the effect of the pipe diameter on the ultimate soil settlement is not significant.

导出引用

张锋, 魏松林, 桂春, 周能华, 郑仔豪. 软硬交界沉降下玻璃钢管破坏机理研究[J]. 装备环境工程. 2026, 23(6): 177-186 https://doi.org/10.7643/issn.1672-9242.2026.06.016

ZHANG Feng, WEI Songlin, GUI Chun, ZHOU Nenghua, ZHENG Zihao. Failure Mechanism of Fiberglass Reinforced Plastic Mortar Pipes under Soft Hard Interface Settlement[J]. Equipment Environmental Engineering. 2026, 23(6): 177-186 https://doi.org/10.7643/issn.1672-9242.2026.06.016

中图分类号： U178

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