Numerical Simulation of Temperature Effects on Mechanical Behavior of the Railway Tunnel in Tibet
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pISSN 1226-7988, eISSN 1976-3808 www.springer.com/12205
DOI 10.1007/s12205-020-1893-1
Tunnel Engineering
Numerical Simulation of Temperature Effects on Mechanical Behavior of the Railway Tunnel in Tibet Shouhua Liu
a
, Jinyang Fua, Junsheng Yanga, and Han Feng
a
School of Civil Engineering, Central South University, Changsha 410075, China
a
ARTICLE HISTORY
ABSTRACT
Received 21 October 2019 Accepted 15 July 2020 Published Online 25 September 2020
Under the influence of plate collision, the high geothermal is a widespread phenomenon within the region of Tibet. Due to the aforementioned high geothermal, lining cracking is a common disaster in Sangzhuling tunnel during construction period. This paper presented the mechanical behaviour of tunnel lining under high geothermal temperature, which is studied by thermo-mechanical numerical method. The results both from field investigation and numerical analysis demonstrate that high geothermal temperature can cause the tunnel lining cracking and the variation of the stress of the tunnel lining. Thus, a novelty sandwich composite lining supporting scheme is proposed to overcome such geothermal temperature effects, in which a thermal insulation layer between primary supporting and secondary supporting is designed. The numerical analysis results indicate that the insulation layer can significantly improve the mechanical characteristics of the lining structure. In addition, the effect of the insulation layer is not linear with its thickness. For this reason, the optimum insulation thickness of the insulation layer is chosen as 0.06 m, which was optimized by a numerical parametric analysis. The research can provide a reliable reference for tunnelling works in high geothermal regions.
KEYWORDS High geothermal regions Tunnel Lining structure Thermal insulation layer Numerical analysis Novelty sandwich composite lining
1. Intsroduction In recent years, mountain tunnels are extensively and increasingly constructed in western China to facilitate local traffic (Wang, 2010; Hou et al., 2011; Meng et al., 2013; Zhao et al., 2019a; Liu et al., 2020). With the increase of tunnel engineering, large deformation (Lei et al., 2008; Wang et al., 2015; Du et al., 2017) and cracking (Chiu et al., 2014; Lai et al., 2017) disasters of the concrete lining caused by the sophisticated environment have become increasingly prominent. High geothermal temperature is a big challenge for actual construction projects, which will harm construction workers and cause structural instability behaviours. Especially for underground structures such as tunnels or caverns, high geothermal temperature must be received more attention due to the potential hazards (Wilhelm and Rybach, 2003; Hochstein and Prebble, 2006; Chen et al., 2014; Park et al., 2016; Zhang et al., 2019). The analytic solution (Kumar and Singh, 1989; Kumar and Singh, 1990), numerical simulation (Jung et al., 2014; Park et al., 2016), site test and model experiment (Wang et al., 2013; Zhao et al., CORRESPONDENCE Han Feng
fenghan_csu@163.
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