Geomechanics and Engineering

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Deformation mechanisms of shallow-buried pipelines during road widening: Field and numerical investigation

  • Long Chen (Key Laboratory of Ministry of Education for Geomechanics and Embankment-Engineering, Hohai University) ;
  • Chenlei Xie (Key Laboratory of Ministry of Education for Geomechanics and Embankment-Engineering, Hohai University) ;
  • Zi Ye (Key Laboratory of Ministry of Education for Geomechanics and Embankment-Engineering, Hohai University) ;
  • Yonghui Chen (Key Laboratory of Ministry of Education for Geomechanics and Embankment-Engineering, Hohai University) ;
  • Zhewei Chai (Key Laboratory of Ministry of Education for Geomechanics and Embankment-Engineering, Hohai University) ;
  • Yun Li (Key Laboratory of Ministry of Education for Geomechanics and Embankment-Engineering, Hohai University)
  • Received : 2023.12.14
  • Accepted : 2024.06.19
  • Published : 2024.07.10
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Abstract

The rapid development of the economy has compelled the widen of highways, and the main challenge of this undertaking lies in the uneven settlement of road embankments. Through field and numerical experiments, this study explores the deformation mechanism of shallow buried pipelines due to road widening. The utilization of Plaxis3D software, which is adapt at simulating complex engineering geological conditions, enables the simulation of the settlement of both the central and right-side road embankments. Comparing with other numerical software such as ABAQUS and COMSOL, Plaxis provided more constitutive models including HS, HSS and Hoek-Brown model. The work concludes that the uneven settlement of road cross-sections is positively correlated with the horizontal distance from the pipeline, with a maximum settlement of 73 mm observed after construction. Furthermore, based on the Winkler's assumption, theoretical settlement and stress calculation methods are established. Results indicate that the maximum difference between the calculated values of this formula and simulated values is 1.9% and 7%, respectively. Additionally, the study investigates the stress and settlement of the pipeline's top under different angles to understand its behavior under various conditions. It finds that with traffic loads applied to the new embankment, a lever effect occurs on the lower pipeline, with the fulcrum located within the central isolation zone, leading to a transition in curve type from "single peak and single valley" to "double peak and single valley." Moreover, the settlement of pipelines on both sides of the central isolation zone and the normal stress of the pipeline's top section are symmetrical.

Keywords

Acknowledgement

The authors would like to acknowledge the financial support from by Basic Research Project of Nantong (Grant Nos. JC22022087), the Fundamental Research Funds for the Central Universities of China (Grant Nos. B210202032) and the National Natural Science Foundation of China (Grant Nos. 52178327 and 52308348). All the above support and assistance are greatly appreciated.

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