Field test of thermal environment and thermal adaptation of workers in high geothermal tunnel

et al. 2022

Lithosphere

High geotemperature seriously impacts personnel and equipment during railway and expressway tunnel construction. In this study, the Nige tunnel in the expressway from Gejiu to Yuanyang in Honghe Prefecture was used as an example. Firstly, automatic temperature recording devices were used to monitor the variation characteristics of the tunnel temperature. Afterward, the variation characteristics of the temperature at 5-10 days and 150 days after tunnel’s completion were revealed. The results showed that the evolution laws of air temperature in each stage could be revealed by logarithmic functions of increasing type and decreasing type. Based on the monitoring over 5-10 days after tunnel’s completion, the temperature range was 26-44°C, and the highest temperature in the tunnel is located near the middle of the tunnel. The temperature fluctuation near the tunnel entrance is relatively small, while it fluctuates greatly near the tunnel exit. Based on the monitoring over 150 days, the air temperature was maintained between 16 and 31°C. The temperature near the tunnel entrance was high, while the temperature near the tunnel exit was low. The performance had a guiding significance for the design and construction of the high-geotemperature tunnel.

Section: Application Of Long-termmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Variation Law of Air Temperature of a High-Geotemperature Tunnel during the Construction

Wen

et al. 2022

Lithosphere

“…In order to solve the problem of high-temperature hazards in deep mining wells, the research on its heat exchange has increased significantly. A series of studies on the temperature field of underground space workplaces are mainly concentrated in the worker-gathering area (Chen et al, 2021; Hu et al, 2019). Han et al (2019) conducted thermal comfort research on deep hot and humid mines.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of surrounding rock heat dissipation and wind temperature prediction in high geotemperature coal face

Energy Exploration & Exploitation

2023

The heat damage in a coal face of a high-temperature mine is a significant mine disaster owing to various heat sources. Understanding the influence of various heat sources on the air temperature distribution in the coal face can help us to determine reasonable working conditions. Therefore, it is necessary to take into account the coupling relationship of multiple heat sources and obtain accurate prediction results. In this paper, the finite volume calculation method is used to establish a numerical model of heat dissipation of surrounding rock considering the difference in thermal and physical properties of coal and rock in the coal face. And then, a high-temperature coal mine in the northeast of China is taken as an example to explore the airflow temperature distribution law of the coal face under the influence of the absolute heat source and the relative heat source via the finite difference method. Furthermore, an orthogonal test was performed to investigate the influence degree of major factors on heat exchange of the coal face through range analysis. This work supplements the existing numerical model and research, and provides a theoretical basis and more accurate practical methods for predicting the thermal environment of coal face, especially in high mining depth mines.

“…The tunnel construction process is very complex, objectively, and involves much machinery and equipment, the construction environment is bad, and affected by natural conditions such as geological, weather, subjectivity of the construction personnel, and professional safety management level, so the tunnel construction site is very prone to accidents, such as landslides, water, construction personnel’s unsafe behavior causing accidents, etc. Such a working environment seriously threatens the life safety of tunnel construction personnel [ 4 , 5 , 6 ]. According to statistics [ 7 ], 109 tunnel construction accidents occurred from 2005–2019, resulting in 338 fatalities.…”

Section: Introductionmentioning

confidence: 99%

Factors Affecting Road Tunnel Construction Accidents in China Based on Grounded Theory and DEMATEL

Yang

Easa

et al. 2022

IJERPH

Despite the continuous progress of tunnel construction technology and safety management technology, road tunnel construction safety still faces many challenges in China, such as how to ensure the effective management and safety control of people and materials, how to ensure the implementation of technology and program implementation, risk assessment of construction site environmental information, etc. Exploring the causes of tunnel construction accidents and understanding the properties of the factors and their interrelationships can effectively control the sources of risk and contribute to the safety control of tunnel construction. Therefore, we have collected 30 formal accident investigation reports from the government safety supervision and management department from 2005 to 2021, including detailed investigation and accident analysis. Based on grounded theory, a qualitative research method to generalize experience through direct observation, abstraction, and analysis of data, we use Nvivo11 software to analyze reports and obtain 6 selective codes, 16 spindle codes, and 43 open codes. In addition, we construct a theoretical model of tunnel construction accident influencing factors, which passed the saturation test. The Decision-Making Trial and Evaluation Laboratory (DEMATEL) model is used to analyze the influencing mechanism and interaction relationships of these factors. The two dimensions of influence degree and centrality are used to determine the critical influencing factors of tunnel construction accidents in mountainous areas. They are security awareness and professionalism. According to the cause degree, the influencing factors are divided into cause and result factors. Finally, the basis and suggestions for reducing construction accidents are presented.