Experimental Investigation of Ground and Air Temperature Fields of a Cold‐Region Road Tunnel in NW China

Abstract

To fully understand the temperature distribution of cold regions and the variation law of temperature fields in cold-region tunnels, this paper presents a case-history study on a tunnel located on the eastern Qinghai-Tibet Plateau, China. The conclusion is as follows: the temperature outside the tunnel and the ambient temperature are affected by wind speed and light. The law of the temperature field in the tunnel is greatly affected by wind speed and wind direction. According to the field test, the wind speed in the tunnel is about 2.8 m/s in winter, and the daily average temperature at the exit of the tunnel is basically lower than that at the entrance. From the central to the entrance, the temperature in the tunnel decreases by 0.11°C every 10 meters along the longitudinal direction; from the central to the exit, the temperature in the tunnel increases by 0.07°C every 10 meters. In this regard, for the problems of lining frost damage and central drainage pipe freezing, it is suggested to adopt the way of heating and drainage, but heating the freezing area outside the drainage pipe should be avoided. The test results can provide references for the design, construction, and research of the temperature field of the tunnel antifreezing system in the cold region. It is hoped that the test results can be useful in the design and construction of frost damage prevention systems and the investigation of temperature fields in cold-region tunnels.

Tunnelling‐Induced Settlement and Treatment Techniques for a Loess Metro in Xi’an

“…Compared with the results measured in the field, we have to admit that numerical simulations cannot reflect the actual situation. erefore, currently we mainly rely on monitoring to identify the structure states to ensure the safety of underground construction [44][45][46]. However, numerical simulations perform well in regularity analysis [47][48][49][50][51][52][53][54][55].…”

Stability Analysis of TBM Tunnel Undercrossing Existing High‐Speed Railway Tunnel: A Case Study from Yangtaishan Tunnel of Shenzhen Metro Line 6

“…It could be concluded that excavation programs I and II had little effect on the rock mass settlement of the newly built tunnel and sedimentation characteristics were similar. Based on the above numerical analyses, it could be concluded that, according to the Code for Monitoring Measurement of Urban Rail Transit Engineering (GB50911-2013) [4,7], the maximum allowable value of surface settlement reached 20 mm and surface settlement rate reached 4 mm/day as a control node for surrounding rock stability which could effectively guarantee the safe construction of surrounding rock and effectively control construction efficiency. It was also found that the corresponding maximum settlement values of rock mass obtained for excavation programs I and II were 12.60% and 12.67% of the maximum allowable settlement value, respectively, indicating that the rock masses of the newly built left and right lines were under relatively stable and safe construction conditions.…”

“…In particular, in urban underground space engineering practices, new tunnels would inevitably underpass the existing buildings and important traffic lines. erefore, the excavation of new tunnels disturbs the strata surrounding tunnel body and even affects the safe use of adjacent existing buildings [7][8][9][10]. When a new underground rock mass project is executed near a high-speed railway tunnel, which poses unprecedented challenges to the safe construction of underpass [11][12][13][14][15][16], strict requirements are imposed on the settlement and deformation of surrounding rocks due to the existing high-speed railway line [17][18][19].…”

Mechanical properties and damage constitutive model for uniaxial compression of salt rock at different loading rates

“…The mechanical properties of salt rock at different loading rates shows some variation. Therefore, it is of great significance to study the mechanical properties of salt rock at different loading rates to ensure the safety and stability of underground gas storage (Chen et al., 2020; Wang et al., 2020a; Wu et al., 2020b).…”