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

ZHANG Feng; WEI Songlin; GUI Chun; ZHOU Nenghua; ZHENG Zihao

doi:10.7643/issn.1672-9242.2026.06.016

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Equipment Environmental Engineering ›› 2026, Vol. 23 ›› Issue (6) : 177-186. DOI: 10.7643/issn.1672-9242.2026.06.016

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

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

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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.

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soil settlement / soft-hard soil interface / glass fiber reinforced plastics mortar pipes / finite element model / structural failure / mechanical response

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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

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