The Rehabilitation Project of Highland Road Tunnel

Liu, Hai Jing; Zheng, Jia Yan; Lin, Zhi

doi:10.4028/www.scientific.net/amr.255-260.1048

Cited by 5 publications

(5 citation statements)

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“…The water trough is introduced into the natural gully with good geological conditions and stable surrounding rocks through the discharge tunnel, and the application effect is ideal. (2) Field investigation on the cold-proof drainage hole of tunnels in service in the cold region and evaluation on its effect: Liu et al [35] conducted disease detection on the tunnel at Dabanshan, which has been put into operation, and confirmed the effective function of groundwater in the cold-proof drainage tunnel drainage hole by analyzing the causes of the disease. (3) Simulation study for temperature field of cold-proof drainage hole: Lai [36] conducted onsite temperature monitoring on the Qingshashan highway tunnel in the eastern Tibetan Plateau and studied the temperature difference distribution of the tunnel in the cold region.…”

Section: State Of the Artmentioning

confidence: 99%

Analysis on the Appropriate Buried Depth of the Cold-proof Drainage Hole of the Tunnel in the Cold Region

2021

Teh. vjesn.

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A cold-proof drainage hole is an effective measure to prevent freezing injury of a tunnel in a cold region. However, the construction technology and insulation effect of the cold-proof drainage hole only focused on existing research. This study used MIDAS/GTS for modelling based on a tunnel in cold region of Qinghai Province, China to determine the suitable buried depth of a cold-proof drainage tunnel from the mechanical properties and variation of deformation of tunnel in cold region. The working conditions of first excavating the main tunnel and then the cold-proof drainage hole were set. The variation rules of displacement, stress, and plastic zone of the main tunnel and the cold-proof drainage hole under different buried depths were analyzed. The interaction mechanism between the main tunnel and the cold-proof drainage tunnel under different buried depths was revealed. Results show that: the structure of main tunnel hole is interplayed with that of cold-proof drainage hole; from the point of displacement change rule, the optimal effective buried depth for cold-proof drainage hole of a tunnel in China's Qinghai Province is from 5 m to 6 m; from the point of stress change rule, the optimal effective buried depth for the cold-proof drainage hole is also from 5 m to 6 m; from the point of plastic zone change rule, the optimal effective buried depth for the cold-proof drainage hole is from 4 m to 6 m considering the stress uniformity of support and material for cold-proof drainage hole. The effective buried depth of the coldproof drainage hole is confirmed to be 5 m. The results of finite element analysis are consistent with the field monitoring results, thereby verifying the reliability of the analytical results in this study. This study has guiding significance for the construction of the cold-proof drainage tunnel in the cold region.

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Section: State Of the Artmentioning

confidence: 99%

Analysis on the Appropriate Buried Depth of the Cold-proof Drainage Hole of the Tunnel in the Cold Region

2021

Teh. vjesn.

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“…Engineering practice has demonstrated that tunnels built in cold regions are susceptible to serious frost damage due to periodic temperature changes (Wang et This poses mechanical and technical challenges ) as well as signi cant safety hazards to the tunnel's operation and maintenance (Li et al 2022;Liu et al 2011). The primary issues associated with frost damage in high-altitude tunnels are ice accumulation on the lining structure and auxiliary facilities, ice blockage in drainage ditches, ice buildup on the roadbed, and structural cracks.…”

Section: Introductionmentioning

confidence: 99%

Research on the Temperature Field and Water Discharge Around Different Drainage Structures for the Cold Tunnel

Jia,

Zhu,

Wang

et al. 2023

Preprint

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Cold tunnels are vulnerable to frost damage, which poses a serious threat to their safe operation. This article focuses on the Hongtushan Tunnel and presents results from indoor model tests investigating the temperature field variations in surrounding rock at the tunnel bottom and the Water Discharge process of drainage structures under different conditions. The study analyzed the relationship between freezing depths of the model tunnel's surrounding rock and changes in both air temperature and depth within the tunnel, comparing the test results with on-site measurements of freezing depths. The findings revealed that insulation measures have a greater impact on the central drainage ditch than the cold-resistant drainage tunnel; implementing insulation measures for drainage structures significantly increased water discharge within the same time period. Moreover, the freezing depth of surrounding rocks under the tunnel arch exhibited a quadratic polynomial distribution along the depth direction. By taking advantage of the similarity between freezing depths and temperatures, combined with on-site temperature measurements inside the tunnel, actual freezing depths can be calculated, providing guidance for drainage structure placement. These results offer important insights for mitigating frost damage in high-altitude tunnels and promoting safer tunnel operations.

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“…Kim et al 15 studied the causes of water seepage in alpine cold tunnels by developing new tunnel drainage structures. Liu et al 16 introduced the basic principles, ideas, and specific measures for the treatment of diseases such as water leakage, insulation, and lining reinforcement in the Dabanshan cold Tunnel by analyzing the causes of the diseases of tunnels. To reduce the risk of blockage in the tunnel drainage system, Liu et al 17 determined the distribution of defects in highway tunnels through on-site investigation, indoor experiments, and literature analysis, and proposed an optimization method for tunnel drainage structure.…”

Section: Introductionmentioning

confidence: 99%

Change of temperature field around different drainage structures in cold region tunnel based on model testing

Zhu,

Zhang,

Liu

et al. 2023

Sci Rep

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Improper layout of drainage structures and inadequate insulation measures in cold tunnels can result in varying degrees of frost formation during operation. This study focuses on the Hongtoushan highway tunnel as an example, where the distribution characteristics of the temperature field around the lower drainage structure under different arrangements are investigated through indoor model testing. The results indicate that there is a significant hysteresis phenomenon in temperature changes across the cross-section as the burial depth increases. With an increase in the burial depth of the surrounding rock, the hysteresis time of temperature changes gradually elongates. The temperature variation pattern can be approximated by a cubic polynomial. In the vertical section, as the tunnel depth increases, the temperature of the surrounding rock in the lower part of the tunnel gradually rises while the amplitude of temperature change diminishes. The temperature near the centerline is relatively lower compared to the sides, where the temperature gradually increases moving away from the centerline.

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The Rehabilitation Project of Highland Road Tunnel

Cited by 5 publications

References 0 publications

Analysis on the Appropriate Buried Depth of the Cold-proof Drainage Hole of the Tunnel in the Cold Region

Analysis on the Appropriate Buried Depth of the Cold-proof Drainage Hole of the Tunnel in the Cold Region

Research on the Temperature Field and Water Discharge Around Different Drainage Structures for the Cold Tunnel

Change of temperature field around different drainage structures in cold region tunnel based on model testing

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