Numerical Analyses of the Stress and Limiting Load for Buried Gas Pipelines under Excavation Machine Impact

Anlin, Yao; Xu, Taolong; Zeng, Xiangguo; Jiang, Hongye

doi:10.1061/(asce)ps.1949-1204.0000137

Cited by 10 publications

(3 citation statements)

References 8 publications

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“…The peak strains of the pipeline at mid-span derived from the FEA were compared with the measured results from the test and theoretical computation, as summarized in Table 6, where the theoretical results were theoretically derived calculated based on the mathematical Equation (21), and the peak strain (ε max, EXP ) in the test was calculated based on the peak longitudinal and transverse strains (ε L and ε T ). It can be found from Table 6 that the standard deviations among ε max,EXP and ε max,THE , and ε max,EXP and ε max,FEA were 6.85% and 5.12%, respectively, according to the calculation of the relative deviation between theory and FEA; compared with some references [49,50], the standard deviation of theory and FEA was more accurate. The results show that the peak strain from the FEA results basically matched with the experimental and theoretical results, which verifies the rationality of the mathematical formula and the feasibility of the FEA model.…”

Section: The Peak Strainmentioning

confidence: 93%

Experimental and Numerical Study on the Strain Behavior of Buried Pipelines Subjected to an Impact Load

et al. 2019

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Long-distance oil and gas pipelines are inevitably impacted by rockfalls during geologic hazards such as mud-rock flow and landslides, which have a serious effect on the safe operation of pipelines. In view of this, an experimental and numerical study on the strain behavior of buried pipelines under the impact load of rockfall was developed. The impact load exerted on the soil, and the strains of buried pipeline caused by the impact load were theoretically derived. A scale model experiment was conducted using a self-designed soil-box to simulate the complex geological conditions of the buried pipeline. The simulation model of hammer-soil-pipeline was established to investigate the dynamic response of the buried pipeline. Based on the theoretical, experimental, and finite element analysis (FEA) results, the overall strain behavior of the buried pipeline was obtained and the effects of parameters on the strain developments of the pipelines were analyzed. Research results show that the theoretical calculation results of the impact load and the peak strain were in good agreement with the experimental and FEA results, which indicates that the mathematical formula and the finite element models are accurate for the prediction of pipeline response under the impact load. In addition, decreasing the diameter, as well as increasing the wall thickness of the pipeline and the buried depth above the pipeline, could improve the ability of the pipeline to resist the impact load. These results could provide a reference for seismic design of pipelines in engineering.

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Section: The Peak Strainmentioning

confidence: 93%

Experimental and Numerical Study on the Strain Behavior of Buried Pipelines Subjected to an Impact Load

et al. 2019

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“…In recent years, emphasis has been placed on the study of responses of existing properties to deep excavations. Several commonly used techniques to investigate deformation behaviors and the corresponding environmental effects of braced excavations are FEM analyses based on numerical tools [11][12][13][14][15][16], empirical/semiempirical methods based on field measurements [17][18][19][20][21][22]; or a published database [23][24][25][26], analytical solutions [27][28][29][30][31][32], and model tests [33,34]. In addition, machine learning (ML), artificial intelligence (AI), and artificial neural network (ANN) algorithms are becoming increasingly accurate and reliable in predicting elastic fields of soil around retaining walls under various scenarios of wall movements [35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Analytical Solution for the Deformation of Pipe Galleries Adjacent to Deep Excavation

Xiang,

Liu,

Cui

et al. 2024

Buildings

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Deep excavations clearly impact adjacent existing properties and threaten their operational safety. Predicting the deformation of existing infrastructure induced by nearby underground construction is the main concern of urban underground development. This paper presents an analytical calculation method for predicting underground pipe gallery deformations induced by adjacent deep excavations. First, the authors assume the existing pipe gallery to be nonexistent in the soil and propose a solution to calculate the excavation-induced vertical movements of the soil at the position of the existing pipe gallery. Thereafter, the authors simplify the existing pipe gallery as an elastic beam on a Winkler foundation to calculate its deformation. Finally, the method is verified by the good agreement found between the calculated result and the field measurement of the construction of the Shanghai Hongqiao CBD project. The proposed analytical method of this work can provide accurate evaluation results for similar engineering projects.

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“…This nonlinear 3D finite element model was also developed to predict the ductile fracture of the pipe wall triggered by a hypothetical welding defect subjected to combined internal pressure and inelastic bending . By using finite element method, the dynamic response of a buried gas pipeline with a semi‐elliptical crack under transverse impact loads and excavation machine impact was investigated. Experimental work was also performed to predict the crack propagation around the pipelines.…”

Section: Introductionmentioning

confidence: 99%

Predicting the crack opening displacements of a partially debonded pipeline in rock mass under P waves

Fang

Huang

Liu

2016

Fatigue Fract Eng Mat Struct

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A crack open may lead to the failure because of rupture or leak in the pipeline. In this paper, the dynamic crack opening displacements (CODs) of a partially debonded pipeline subjected to P and SV waves are predicted, and a mathematical model is proposed. The debonded region around the pipeline is modelled as an interface crack with non‐contacting faces. The wave fields in the bonded and debonded areas are expressed by wave function expansion method, and the expanded coefficients are determined by satisfying the boundary conditions with consideration of cracks. The CODs in the debonding area are represented by Chebyshev polynomials. Some examples are illustrated to analyse the CODs under different thicknesses of pipeline and different wave frequencies. In the region of high frequency, the value of CODs is more sensitive to the crack size. The difference between the CODs in the compression direction and shear directions is also examined. Comparison with existing results is given to validate this dynamic model.

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Numerical Analyses of the Stress and Limiting Load for Buried Gas Pipelines under Excavation Machine Impact

Cited by 10 publications

References 8 publications

Experimental and Numerical Study on the Strain Behavior of Buried Pipelines Subjected to an Impact Load

Experimental and Numerical Study on the Strain Behavior of Buried Pipelines Subjected to an Impact Load

Analytical Solution for the Deformation of Pipe Galleries Adjacent to Deep Excavation

Predicting the crack opening displacements of a partially debonded pipeline in rock mass under P waves

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