Numerical Simulation of Site Deformation Induced by Shield Tunneling in Typical Upper-Soft-Lower-Hard Soil-Rock Composit
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pISSN 1226-7988, eISSN 1976-3808 www.springer.com/12205
DOI 10.1007/s12205-020-0124-0
Tunnel Engineering
Numerical Simulation of Site Deformation Induced by Shield Tunneling in Typical Upper-Soft-Lower-Hard Soil-Rock Composite Stratum Site of Changchun Liyun Li
a
, Xiuli Dua, and Jing Zhoua
a
Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China
ARTICLE HISTORY
ABSTRACT
Received 6 February 2020 Revised 20 April 2020 Accepted 21 May 2020 Published Online 31 July 2020
In China, with the rapid development of subway construction, the site deformation induced by subway construction is an interesting and hot issue in civil engineering. Focusing on the mechanism and characteristics of site deformation induced by parallel shield tunnel construction in typical soil-rock composite strata of Changchun region, and relying on the subway tunnel between Northeast Normal University Station and Gongnong Square Station, which belongs to the Changchun Metro Line 1, the tunnel construction process is simulated using FLAC3D software. In this paper, the numerical modeling and parameters for shield tunneling are described in detail, and the mechanism and characteristics of site deformation induced by shield tunneling are discussed systematically. Furthermore, the influence of construction parameters on site deformation, including construction sequence, tunnel spacing and earth chamber pressure, are studied. The results can provide reference for similar projects in the future.
KEYWORDS Site deformation characteristics Soil-rock composite strata Shield tunneling Numerical simulation Influencing factors
1. Introduction Analysis and prediction of site deformation induced by subway construction is a research hotspot in infrastructure engineering field. As an important part of urban subway lines, tunnel bridges the stations and bears the train running. There are many fruits on site deformation induced by tunnel construction. Peck (1969) discovered that the shape of ground settlement trough perpendicular to the direction of tunnel excavation is a normal distribution curve, and put forward the famous Peck formula. Subsequently, many scholars (Attewell and Woodman, 1982; New and O'Reilly, 1991; Han et al., 2007; Yao et al., 2010; Yang et al., 2012; Zheng and Ma, 2017; Zhou et al., 2017) have carried out in-depth research on Peck formula. Some scholars (Jiang et al., 2004; Wei, 2009; Wei, 2010; Chen et al., 2014; Lu, 2016; Zhou et al., 2018a) predicted the ground settlement trough induced by tunnel construction based on Peck formula. Verruijt and Booker (1998) studied the surface settlements due to deformation of a tunnel in an elastic half plane, and presented an approximate analytical solution considering the soil as a linear elastic material. Fu et al. (2016b) developed an analytical approach to incorporate the CORRESPONDENCE Liyun Li Beijing 100124, China
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ⓒ 2020 Korean Society of Civil Engineers
three tunnel-deforming param
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