Analysis and Countermeasures on Seismic Damages of Gas Pipeline Network in Wenchuan Earthquake

Wang, Xiang Jian; Guo, En; Zhang, Mei Jing

doi:10.4028/www.scientific.net/amr.194-196.1938

Cited by 5 publications

(6 citation statements)

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“…In 1995, during the Osaka Kobe earthquake (M = 7.3), there were more than 20,000 leaks from gas pipes in the Osaka area, and most of them occurred at the elbows of welded steel pipes. For the water supply pipes, 900,000 households were cut off from the water supply, 23 nodes, such as elbows, were damaged near the Kanzaki River, and the sewage and rainwater drainage networks in Kobe City were also severely damaged, covering an area of nearly 3m/ha [4]; In 2008, during the Wenchuan earthquake (M = 8.0), nearly 20 cities and counties in Sichuan Province alone, including the underground pipe network, suffered serious damage to the water supply and the gas supply facilities, including gas companies and water plants in Beichuan, Dujiangyan, Mianzhu and other places; although they could operate normally, the underground pipe network was seriously damaged [5,6]. The leakage at the pipe network joints and other important nodes is huge in such a scenario, which then cannot meet the requirements of use, and it is difficult to repair the damage quickly [7].…”

Section: Introductionmentioning

confidence: 99%

Response analysis of the nodes of pipe networks under seismic load

et al. 2021

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Transient ground displacement (TGD) that is caused by earthquakes can damage underground pipes. This damage is especially critical for the joints, elbows and tees of the pipes which play an important role in the operation of a pipe network. In this study, a scale pipe network with both elbows and tees, as well as some components of the pipe network with only tees or elbows, has been investigated. The response of the nodes of a pipe network, when installed in non-uniform geology, was analyzed using the shaking table test and ABAQUS finite element simulation. This paper has firstly introduced the preparation of the test and the developed finite element model. Then the system response in terms of strain, the friction, the bending deformation, the node deformation amplification coefficient and the pipe-soil relative displacement along the pipe axis of the pipe network and two pipe network components have been analyzed explaining the correlation between these responses. Finally, the influence of elbows and tees on the pipe network was analyzed, and the conclusions that have been reached about how tees and elbows can change the response of a pipe network during an earthquake can provide theoretical support for the seismic design and layout of an underground pipe network.

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Section: Introductionmentioning

confidence: 99%

Response analysis of the nodes of pipe networks under seismic load

et al. 2021

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“…The stick-slip action of faults generally triggers strong earthquakes, which can cause large displacements to appear at the ground surface, produce strong ground motions in high seismic intensity regions, and pose severe damage to structures. The damage to pipelines in typical strong earthquakes, such as the 1975 Haicheng (Sun andHou, 1991), 1976 Tangshan (Sun and Shien, 1983), 2002 Alaska (Hall et al, 2003;Honegger et al, 2004), and 2008 Wenchuan earthquakes (Wang et al, 2012), was investigated, which presented the destruction features of structures and primary influencing factors on destructiveness. In the 1978 Miyagiken-Oki earthquake, approximately 350 cases of damage to water and gas pipelines were investigated near the cut-and-fill boundaries of newly developed residential areas (Liang and Sun, 2000).…”

Section: Introductionmentioning

confidence: 99%

Seismic Response of a Water Transmission Pipeline Across a Fault Zone Adopting a Large-Scale Vibration Table Test

et al. 2021

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The seismic response is generally amplified significantly near the fault zone due to the influence of discontinuous interfaces and weak-broken geotechnical structures, which imposes a severe geologic hazard risk on the engineering crossing the fault. The Hanjiang to Weihe River Project (phase II) crosses many high seismic intensity regions and intersects with eight large-scale regional active faults. Seismic fortification of the pipelines across the fault zone is significant for the design and construction of the project. A large-scale vibration table test was adopted to investigate the seismic response and fault influences. The responses of accelerations, dynamic stresses, strains, and water pressures were obtained. The results show that the dynamic responses were amplified significantly by the fault zone and the hanging wall. The influence range of fault on acceleration response is approximately four times the fault width. The acceleration amplification ratio in the fault zone generally exceeds 1.35, even reaching 1.8, and the hanging wall amplification ratio is approximately 1.2. The dynamic soil pressure primarily depends on the acceleration distribution and is apparently influenced by pipeline location and model inhomogeneity. The pipeline is bent slightly along the axial direction, accompanied by expansion and shrinkage in the radial direction. The maximum tensile and compressive strains appear at the lower and upper pipeline boundaries near the middle section, respectively. Massive y-direction cracks developed in the soil, accompanied by slight seismic subsidence. The research findings could provide reasonable parameters for the seismic design and construction of the project.

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“…It severely damaged the water supply network in Dujiangyan city and disconnected water to over half of the customers. More than 800 leaks in the gas supply network were identified in Mianyang city, and the gas supply pressure in the system was decreased from 0.25 to 0.1 MPa [3,4].…”

Section: Introductionmentioning

confidence: 99%

Seismic Analysis of Connections of Buried Continuous Pipelines

Liu

Huang

Wang

et al. 2020

Advances in Civil Engineering

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Buried pipelines serve as a critical component of lifeline systems, such as water and gas supply. They are interconnected to form a network to transport utilities. The connections change the geometry and stiffness of pipelines and impact the seismic response of the pipelines. This paper investigates the influence of connections on the seismic response of buried continuous steel trunk lines. A finite element model is introduced for analyzing the seismic response of buried pipeline networks. The seismic response of continuous steel pipelines with different connections, including cruciform and T-, K-, L-, and Y-shaped, is analyzed. The impact of site class, pipe diameter, branch angle, and angle of wave incidence on the response of pipe connections is explored. An influence coefficient defined to characterize the strain amplification at the connections is proposed for different forms of connections. Engineering measures to reduce the strain amplification at connections are suggested.

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Analysis and Countermeasures on Seismic Damages of Gas Pipeline Network in Wenchuan Earthquake

Cited by 5 publications

References 0 publications

Response analysis of the nodes of pipe networks under seismic load

Response analysis of the nodes of pipe networks under seismic load

Seismic Response of a Water Transmission Pipeline Across a Fault Zone Adopting a Large-Scale Vibration Table Test

Seismic Analysis of Connections of Buried Continuous Pipelines

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