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Different types of faults: (a) normal fault; (b) reverse fault; (c) strike-slip fault; (d) oblique-slip fault.
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The length of buried pipelines usually extends thousands of meters or more in engineering, and it is difficult to carry out full-scale tests in the laboratory. Therefore, considering the seriousness of pipeline damage and the difficulty of operating tests and other test limitations, it is necessary to develop a reasonable method to simplify the len...
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Citations
... A large number of studies on the response of underground pipelines or tunnels under the action of fault displacement have been published, which typically used testing [7][8][9][10][11][12][13][14][15][16] and numerical methods [13][14][15][16][17][18][19][20]. The testing methods were dominated by centrifuge model tests [7][8][9][10][11][12] and soil-box model tests [13][14][15][16]. ...
... A large number of studies on the response of underground pipelines or tunnels under the action of fault displacement have been published, which typically used testing [7][8][9][10][11][12][13][14][15][16] and numerical methods [13][14][15][16][17][18][19][20]. The testing methods were dominated by centrifuge model tests [7][8][9][10][11][12] and soil-box model tests [13][14][15][16]. ...
... A large number of studies on the response of underground pipelines or tunnels under the action of fault displacement have been published, which typically used testing [7][8][9][10][11][12][13][14][15][16] and numerical methods [13][14][15][16][17][18][19][20]. The testing methods were dominated by centrifuge model tests [7][8][9][10][11][12] and soil-box model tests [13][14][15][16]. Numerical methods are usually verified and validated through experimental results [9,[13][14][15][16][17]. Sabagh et al. [9] studied the influence of different factors on the damage of a tunnel under a reverse fault, and the results showed that most damage of the tunnel resulted from a 60 • fault angle. ...
Prefabricated utility tunnels have drawn much attention in relation to rapid urban development. On this, how to maintain the integrity of an underground lifeline, which is subjected to unexpected fault displacement action, is a concern either from the design or the construction aspect. By applying the commercial software program ABAQUS, this paper presents a systematic numerical simulation of a prefabricated utility tunnel affected by a reverse fault. The critical parameters investigated in this study include fault displacement, burial depth, utility tunnel-soil friction coefficient, and the angle of the utility tunnel crossing the fault plane. Results of the numerical modeling revealed that: (1) both the overall structural deformation and the spliced joints deformation of the prefabricated utility tunnel increase with increasing fault displacement, which greatly reduces the waterproofing ability of the utility tunnel joints; (2) the opening displacement of the joints on the roof of the utility tunnel near the fault plane is positively correlated with burial depth, but the variation is slight; (3) the variations in utility tunnel-soil friction coefficient have little effect on the overall structural deformation and the spliced joints deformation; (4) the opening displacement of the spliced joints of the utility tunnel basically gradually increases with an increase in the crossing angle near the fault plane, which is different than when it is away from the fault plane. The main outcomes obtained from this study can provide reference for the construction of prefabricated utility tunnel in fault active area.
... In this study, ABAQUS software is adopted to build the 3D numerical model Wei et al., 2021;Zhang et al., 2021). Because the pipeline subjected to the fault reflects double nonlinear problems of material nonlinearity and geometric nonlinearity, to obtain the soil spring stiffness more accurately, a shell element model is used for modelling the pipe to simulate the actual situation more precisely. ...
There are a lot of researches on qualitative aseismatic measures for buried gas pipeline crossing movable faults. But a few of them are quantitative, especially in the size and shape of the trench. The paper first established the finite element model of the strain of buried pipeline crossing a fault which effected by the size and shape of the trench. And it obtained new soil spring stiffness which considered different buried depth, bottom width of trench, trench slope and elastic modulus of soil. The mechanical analysis model of pipeline is established, and the limit state equation of pipeline is fitted. The reliability and sensitivity of the natural gas pipeline under fault action are analysed by a Monte Carlo method, and the error and accuracy are verified. When the pipeline is under tension, the sensitivity from large to small is buried depth, sand friction angle, pipe diameter, pipeline displacement, trench bottom width, trench depth, clay cohesion, trench slope and clay friction angle; when the pipeline is under pressure, the trench depth and clay cohesion have great influence. The findings of this study provide a reference for pipeline design and safety evaluation under fault action.
