Stress and displacement analysis of aerial oil &amp; gas pipelines: A case study of Lantsang tunnel crossing project

Lü, Hongfang; Huang, Kun; Wu, Shizhou; Han, Xiaoyu; Zhao, Lijie; Gao, Zhao

doi:10.7603/s40632-015-0028-1

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…Furthermore, to obtain the pipe strain accurately and quickly under different working conditions, numerical methods are also generally used by researchers. Lu 13 used CAESAR II software to establish the stress analysis model of the tunnel pipeline, and obtained the critical section position of the natural gas, crude oil, and product oil pipeline crossing the tunnel and the main load affecting the stress. Liu et al 14 analyzed the pipeline strain response under a combination of compression and bending load when the X80 pipeline crossed the strike–slip fault and proposed a semiempirical model for peak strain prediction.…”

Section: Introductionmentioning

confidence: 99%

A new analytical method for calculating the strain of oil and gas pipeline under a normal fault dislocation

et al. 2022

Energy Science & Engineering

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Oil and gas pipelines that go through an active normal fault often deform largely and cause serious disasters. On the basis of the beam theory of the elastic foundation and assuming a shape function for the deformed pipeline, a new analytical method is proposed to calculate the pipeline strain under a normal fault. The length of the deformed pipeline is calculated by using a simplified structural mechanical model. Moreover, a three-dimensional solid finite element model (3D FEM) is developed to calculate the pipeline strain under different working conditions. The developed analytical solution and the numerical results of 3D FEM are compared with the results of the two traditional methods (the dissipated energy method and the Karamitros method). The strain development law predicted by the proposed method and the 3D FEM is in good agreement with that of the dissipated energy method and the Karamitros method. Compared with the existing models, the new analytical method is simpler and more efficient.

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Section: Introductionmentioning

confidence: 99%

A new analytical method for calculating the strain of oil and gas pipeline under a normal fault dislocation

et al. 2022

Energy Science & Engineering

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“…In order to ensure the safety of metro tunnel construction and reduce the impact on existing buildings (structures) and traffic lines, relevant scholars have conducted a lot of research studies on metro tunnel underpassing projects and corresponding control measures [10][11][12]. Lu [13] used the CAESAR II software to establish the stress analysis model of Yanyingshan tunnel pipeline based on the Lantsang tunnel crossing pipeline project and studied the change law of pipeline stress state and displacement during tunnel construction. Liu et al [14] used the MIDAS/GTS NX finite element software to analyze the impact of shield tunnel construction on the existing railway by taking Zhengzhou metro line 4 under the Longhai railway as an example.…”

Section: Introductionmentioning

confidence: 99%

Construction Sequence Optimization and Settlement Control Countermeasures of Metro Tunnels Underpassing Expressway

Zhang

Pei

et al. 2021

Advances in Civil Engineering

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The Chongqing metro line 6 underpass expressway around the city is taken as an engineering background, and the optimal excavation sequence and corresponding control countermeasures for the triangular-distributed three-line metro tunnel underpass expressway are studied. The influences of excavation sequence on the tunnel surrounding rock deformation, surrounding rock stress, supporting structure stress, plastic zone, and surface settlement are analyzed by using MIDAS/GTS NX finite element software. The numerical simulation results showed that Case 1 is the optimal excavation sequence of the metro tunnel. However, the surface settlement under the optimal excavation sequence exceeds the limit value of 30 mm, which cannot guarantee the safety of expressway traffic. On this basis, the control measure for strengthening the three-line tunnels with advanced small pipe grouting and reinforcing the middle tunnel with concrete-filled steel tube piles are proposed. Moreover, the excavation process of the metro tunnel with and without reinforcement schemes is numerically simulated. The results show that the reinforcement scheme can effectively control the surface settlement value within the limited value (16.47 mm), which is close to the maximum surface settlement of 18.31 mm after the metro tunnel excavation is completed, indicating that the proposed reinforcement scheme is beneficial to ensure the safety of metro tunnel construction and the driving safety of the expressway.

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“…These investigations mainly analyzed the structural failure of a NGTP damaged by a third party in the tunnel excavation process. At the same time, the software CAESAR II has been used to investigate the structure failure of NGTPs in the literature ( 12 , 13 ). The influence of the main load was obtained for the stress of the NGTP.…”

mentioning

confidence: 99%

Numerical Investigation of the Strain Characteristics of a Natural Gas Transportation Pipeline Crossing Tunnel

Ding

et al. 2022

Transportation Research Record: Journal of the Transportation R

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To ensure the safe operation of a natural gas transportation pipeline (NGTP) crossing tunnel, a model is established to analyze the strain characteristics. Some factors affecting the strain are considered in this paper. The results show that the strain failure of a NGTP crossing tunnel may occur in the two elbows of the NGTP located at the tunnel entrance and the position in contact with the fixed pipe clamp near the tunnel entrance. At the same time, the strain of the NGTP crossing tunnel is obviously affected by the temperature change of natural gas. So, the temperature change should be controlled within 8 K in the actual operation process. The wall thickness, the length of the NGTP, and the slope angle of the crossing tunnel are also main factors to affect the strain of the NGTP crossing tunnel, while the operation pressure and mountain slope angle have little effect when the operation pressure is 6–11 MPa. The maximum value of Mises equivalent strain is also obviously affected by the pipe diameter when it is more than 273 mm. Meanwhile, a prediction model for the maximum value of Mises equivalent strain is also established by the nonlinear fitting method and the deviation is within ±15% between the calculations and simulation results. The above conclusions will provide a theoretical basis and data support for the safe operation and design of NGTP crossing tunnels.

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Stress and displacement analysis of aerial oil & gas pipelines: A case study of Lantsang tunnel crossing project

Cited by 5 publications

References 5 publications

A new analytical method for calculating the strain of oil and gas pipeline under a normal fault dislocation

A new analytical method for calculating the strain of oil and gas pipeline under a normal fault dislocation

Construction Sequence Optimization and Settlement Control Countermeasures of Metro Tunnels Underpassing Expressway

Numerical Investigation of the Strain Characteristics of a Natural Gas Transportation Pipeline Crossing Tunnel

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