Test and Numerical Simulation of Excavation of Subway Stations Using the Small Pipe–Roof–Beam Method
Publication: International Journal of Geomechanics
Volume 23, Issue 4
Abstract
The small pipe–roof–beam method has better adaptability to ultra-shallow buried subway stations. Five groups of similar model tests were carried out to explore the pipe–roof deformation, surface settlement, and beam strain caused by excavation using this method. Based on the test results, a 3D numerical model was established to study the pipe–roof deformation under different cases. The following conclusions were obtained: as the height-to-span ratio increases, the pipe–roof deformation, and surface settlement increase and, afterward, decrease. Increasing the number of beams can significantly reduce the pipe–roof deformation and surface settlement, and has a greater effect on the surface settlement. The soil-arching effect occurs above the pipe–roof during excavation, and is strengthened with an increase of height-to-span ratios. The difference between the pipe–roof deformation caused by excavation is within 2% in two cases: free at both ends and fixed at only one end. It is not recommended to add support to only one end in actual construction. Adding support at both ends can reduce the pipe–roof deformation by about 40%. The research conclusions have guiding significance for the development of the small pipe–roof–beam method.
Practical Applications
The development of subway construction has gradually become one of the themes of urban development. Finding ways to build subway stations quickly, economically, and safely has gradually become the focus of attention. The pipe–roof method is a method of constructing urban underground space, which is widely used throughout the world. However, there are many shortcomings in the existing pipe–roof method. This paper proposes the small pipe–roof–beam method that can save the construction period on the premise of ensuring safety, which is currently being applied to Shifu Road Station of Shenyang Metro Line 4 in China. In this paper, the law of surface settlement and pipe–roof deformation caused by excavation is obtained by combining the method of laboratory test and numerical simulation. The research can be the theoretical basis for the subsequent application of this method. The matching relationship between the pipe–roof and the beam will be investigated in the next study, which will provide guidance for the optimal design of subway stations.
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Acknowledgments
The research described in this paper was supported by the National Natural Science Foundation of China (51878127 and 52108380), the Natural Science Foundation of Jiangsu Province of China (BK20210721), the Postdoctoral Research Foundation of China (2021M702400), and the Natural Science Foundation for Colleges and Universities in Jiangsu Province (21KJB560018).
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Published In
International Journal of Geomechanics
Volume 23 • Issue 4 • April 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Apr 11, 2022
Accepted: Nov 21, 2022
Published online: Jan 24, 2023
Published in print: Apr 1, 2023
Discussion open until: Jun 24, 2023
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