Study on distribution character of heat regulating ring in roadway surrounding rock: taking Yangchangwan coal mine as an example

doi:10.16265/j.cnki.issn1003-3033.2023.08.1857

Abstract

Abstract:

In order to study the distribution of the surrounding rock temperature field in the roadway, the surrounding rock temperature was measured by using the deep hole temperature measurement technology near the 937 elevation of return air downhill in 13 mining areas of Yangchangwan coal mine, and borehole sampling was conducted near 430 elevation in 13 mining areas to measure the thermophysical parameters of representative rocks Using COMSOL software to establish a numerical model, the temperature field of the surrounding rock of the tunnel is simulated and compared with the measured results. By changing the ventilation time and airflow characteristics, the influence on the tunnel temperature field was analyzed. The results show that the original rock temperature of the tunnel is 28.3 ℃ and the radius of the heat regulating ring is 32 m through deep hole temperature measurement. According to the numerical simulation, the radius of the heat regulating ring is 30.9 m, and the error with the measured result is 3.4%. With the prolongation of tunnel ventilation time, the disturbance range of surrounding rock increases continuously, and the surrounding rock temperature decreases continuously, and the temperature reduction rate gradually slows down. With the decrease of airflow temperature, the surrounding rock temperature also gradually decreases, and the surrounding rock closer to the roadway wall is affected more obviously by airflow temperature. With the increase of airflow velocity, the surrounding rock temperature will gradually decrease. When the wind speed is greater than 4 m/s, the surrounding rock temperature tends to be stable. The research results can provide a reference for ventilation design and heat damage control of the mine.

Key words: roadway surrounding rock, heat regulating ring, temperature field, deep hole temperature measurement, thermal physical parameters, numerical simulation

ZHANG Jian, ZHANG Pengyan, WEI Jianping, SI Guangyao, XU Bo, XU Zhenguo. Study on distribution character of heat regulating ring in roadway surrounding rock: taking Yangchangwan coal mine as an example[J]. China Safety Science Journal, 2023, 33(8): 125-133.

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孔深/m	温度/℃
0.3	22.1
0.8	22.5
1.5	23.8
3	24.6
6	25.3
9	26.4
14	27.7
22	27.8
29	28.3
32	28.3
35	28.4

名称	导热系数λ/ (W·m^-1·K^-1)	比热容c/ (J·kg^-1·℃^-1)	密度ρ/ (g·cm^-3)	导温系数a/ (10^-6m²·s^-1)
泥质粉砂岩	3.03	928.67	2.34	1.39
泥岩	2.83	908.33	2.44	1.28
煤	0.67	1 026.67	1.34	0.49
粉砂质泥岩	2.50	988.67	2.36	1.07
粗砂岩	1.96	860	2.33	0.98
粉砂岩	2.81	1024	2.29	1.20
细砂岩	2.64	985.33	2.36	1.14
中粒砂岩	2.72	884	2.64	1.17