Experimental analysis on temperature field variations of heterogeneous surrounding rock under the condition of periodically changing mine ventilation

ABSTRACT

Seasonal variations of air temperature cause seasonal heat-transfer between tunnel airflow and surrounding rocks of coalmine tunnels. This study analyzed the distribution and evolution law of temperature in inhomogeneous surrounding rocks under varying ventilation cycle and airflow amplitude using a self-developed experimental simulation system of inhomogeneous surrounding rocks. The results show that under the periodically changing ventilation, the functional relationship between the temperature of the surrounding rock and ventilation time met the cosine function. The amplitude attenuation and fluctuation delay of temperature waves in surrounding rocks differ across various depths under the condition of periodic ventilation.

KEYWORDS:

• Periodic air temperature
• heterogeneity
• surrounding rock temperature
• coalmine tunnel
• periodic ventilation

Conflicts of Interest

The authors declare that there is no conflict of interest regarding the publication of this paper.

Data Availability

The numerical simulation and field experiment data used to support the findings of this study are included within the article. The authors declare that the data supporting the findings of this study are available within the article.

Additional information

Funding

This research was funded by the National Natural Science Foundation of China [grant number 51574249]

Notes on contributors

Zhanyuan Dong

Zhanyuan Dong is a PhD candidate of Emergency Management and Safety Engineering at China University of Mining and Technology (Beijing), born 1991. His research focuses on ventilation and cooling technology in mine, CFD numerical simulation

Yueping Qin

Yueping Qin is a professor of Emergency Management and Safety Engineering at China University of Mining and Technology (Beijing), born 1964. Member of China Coal Society. His research focuses on mine ventilation, mine fire and cooling technology in mine.

Jiansong Wu

Jiansong Wu is an associate professor of Emergency Management and Safety Engineering at China University of Mining and Technology (Beijing), born 1985. Secretary of China Association for Public Safety. His research focuses on risk assessment, cooling technology.

Kaiyuan Guo

Kaiyuan Guo is a Master(CUMTB), born 1990. His research focuses on cooling technology in mine.