Experimental and Analytical Study of Jacking Load during Microtunneling Gongbei Tunnel Pipe Roof
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 144, Issue 1
Abstract
This paper presents a case study on the jacking load during the installation of Gongbei tunnel pipe roof using microtunneling. The pipe roof, consisting of 36 pieces of 1,620-mm-diameter steel pipes along a curved alignment, provides the preexcavation support for the Gongbei tunnel, which has a cross-sectional area of and a length of 255 m. The design jacking load was compared with the field measurement, and the difference was investigated. The equation for estimating the face penetration thrust during the slurry type microtunneling was recommended, and a formulation for predicting the total jacking load of the segmented steel pipe along the curved alignment was developed on the basis of the force equilibrium analysis. The unit side frictional resistance and the frictional coefficient of the steel pipes were derived on the basis of the statistical analysis of the field data. The findings from this paper can provide guidance for the design of the jacking load during microtunneling operations for the installation of steel utility pipelines and pipe roofs.
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Acknowledgments
The research is supported by the National Science Foundation (NSF grants 51778386 and 51508503) of the People’s Republic of China (PRC) and by Soochow University in China (grant Q41330014). Special thanks are extended to the NSF of PRC and to Soochow University for their financial support.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 144 • Issue 1 • January 2018
Copyright
©2017 American Society of Civil Engineers.
History
Received: Dec 18, 2016
Accepted: Jun 14, 2017
Published online: Nov 10, 2017
Published in print: Jan 1, 2018
Discussion open until: Apr 10, 2018
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