Abstract
The temperature distribution is one of the most vital parameters which should be fully considered in high geothermal tunnel design. For the purpose of studying the impact of temperature disturbance caused by construction on temperature distribution of surrounding rock and lining structure in a high geothermal tunnel, a new finite difference model for temperature prediction was proposed. Based on the abundant field test results, forecast analysis for the research of a high geothermal tunnel in this paper is made. The results indicate that the temperature of the surrounding rock near the tunnel sidewall decreases obviously in the first 14 days while that of the surrounding rock far away is stable after tunnel excavation, and the rock temperature showed three ways of change: undulate type (<2 m), decline type (2–5 m) and stable type (>5 m). There is a linear relationship between the initial rock temperature and the released heat of the surrounding rock. The radius of the heat-adjusting layer and the initial rock temperature presents a quadratic function relation. The lining concrete actually cures under the variable high-temperature environment and the real curing temperature decreases with time and becomes stable seven days later. The results would contribute to providing support for high geothermal tunnel research and design.
Highlights
With the rapid development of traffic engineering under complex geological conditions, there is a rapid growth in the number of tunnels constructed worldwide under high geothermal activity conditions recently, such as Gotthard-Basis Tunnel in Switzerland Swit, Apennine Railway Tunnel inItaly, Sangzhuling Railway Tunnel in China and so on [1,2]
The study results demonstrated that the mechanical ventilation winds and train-induced winds should be considered in the engineering design of tunnels in cold regions, which has a significant impact on the distribution of the temperature field in the surrounding rock
The reduction of rock temperature near the tunnel sidewall is more than that inthan surrounding rock fartherrock away
Summary
With the rapid development of traffic engineering under complex geological conditions, there is a rapid growth in the number of tunnels constructed worldwide under high geothermal activity conditions recently, such as Gotthard-Basis Tunnel in Switzerland Swit, Apennine Railway Tunnel inItaly, Sangzhuling Railway Tunnel in China and so on [1,2]. High geothermal is an unavoidable and widely distributed problem in deep, long tunnel constructions. It may cause an increase of thermal stress and the degradation of the material properties of concrete [3], resulting in the failure of the lining structure in the tunnel [4,5,6]. Zhang et al [11] concluded that the flow of groundwater had a significant impact on the distribution of temperature of the surrounding rock by an experimental model test. The Sang Zhu Ling tunnel, selected for this study, is a single-track railway tunnel with a total near the Woka garben. It is located andnear exchange heat withHot thespring rock, water whichand causes rise in from the rock in a highly the Woka garben
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