Unsteady temperature field of surrounding rock mass in high geothermal roadway during mechanical ventilation

Abstract

To explore the spatial-temporal evolution law of rock mass temperature in high geothermal roadway during mechanical ventilation, a series of experiments were conducted based on the physical simulation test system of thermal and humid environment in high geothermal roadway, which is a method independently developed by China University of Mining and Technology. The results indicate that during ventilation, the disturbed region of the temperature extends gradually from shallow area to deep area in the surrounding rock mass of the roadway. Meanwhile, the temperature increases as the exponential function from shallow area to deep, with steady decrease of the temperature gradient and heat flux. As the ventilation proceeds, the relationship between dimensionless temperature and dimensionless time approximately meets Hill function.

Keywords

high geothermal mine / heat hazard / unsteady temperature field / evolution law / mechanical ventilation

References

[1] SurhoneL M, TennoeM T, HenssonowS FTautona Mine [M], 2011

[2] RankinW JMinerals, metals and sustainability: Meeting future material needs [M], 2011

[3] XieH-p, ZhouH-w, XueD-j, WangH-w, ZhangR, GaoFeng. Research and consideration on deep coal mining and critical mining depth [J]. China Coal Society, 2012, 37(4): 535-542

[4] WanZ-j, ZhangY, ChengJ-y, ZhouC-b, GuB, ZhouPeng. Mine geothermal and heat hazard prevention and control in China [J]. Disaster Advances, 2013, 6(S5): 85-93

[5] ZhangYuanTransient temperature field of surrounding rock of the high geothermal roadway and its heat control mechanism by heat insulation [D], 2013

[6] XieB-x, ChenY-j, ShiX-zhi. IRMR method for evaluation of surrounding rock quality in deep rock mass engineering [J]. Journal of Central South University (Science and Technology), 2007, 38(5): 987-992

[7] WasilewskiS, BrannyM. A preliminary study of the unsteady states of the ventilation parameters at the longwall face during the shearer operation [C]// 12th U.S. North American Mine Ventilation Symposium. Reno, NV (USA), 2008107-114

[8] KnechtelJ. Thermal hazard prevention in longwalls run under extreme geothermal conditions [J]. Archives Min. Sci., 2011, 56(2): 265-280

[9] YanH, ZhangJ-x, LiL-y, FengR-min. Stability assessment of rock surrounding an I-beam supported retreating roadway [J]. Journal of Central South University, 2015, 22(9): 3598-3607

[10] ZhuT-hao. Study on influence law of ventilation time to temperature of surrounding rock [J]. Safety in Coal Mines, 2010, 424(2): 10-13

[11] WuQ, QinY-p, GuoL, TanKun. Analysis of unsteady temperature field in wall rock by finite element method [J]. J Liaoning Technol Univ, 2002, 21(5): 604-607

[12] MaL N, YanS H, ZhangR L. Heat damage of high-temperature rock tunnel by weighted residual method in tibet plateau [J]. Advanced Materials Research, 2013, 790: 259-263

[13] ZhangY, WanZ-j, ZhouC-b, PeiSong. Spatial-temporal distribution characteristics of surrounding rock temperature in high geothermal roadway [J]. Disaster Advances, 2013, 6(S5): 102-108

[14] ZhangS-guang. Numerical simulation analysis of temperature field in surrounding rock of deeply buried roadways [J]. Sci Technol and Eng, 2006, 6(14): 2194-2196

[15] GaoJ-l, YangMing. Analysis of the factors influencing temperature distribution of surrounding rock and cooled zone radius [J]. J China Safety Sci, 2005, 15(2): 73-76

[16] AbdousM A, AvvalH B, AhmadiP. Analysis of transient heat conduction in a hollow sphere using duhamel theorem [J]. International Journal of Thermophysics, 2012, 33(1): 143-159

[17] TanX-j, ChenW-z, YangD-sen. Study on the influence of airflow on the temperature of the surrounding rock in a cold region tunnel and its application to insulation layer design [J]. Applied Thermal Engineering, 2014, 67(1): 320-334

[18] PanX-l, ZhangX-bo. Analysis on influence of temperature distribution in strata rock and difference method [J]. Coal Eng, 2011, 11: 82-84

[19] ZhangY, WanZ-j, GuB, ZhouC-b, ChengJ-yi. Modeling experimental method of unsteady heat conduction in surrounding rock of roadways or tunnels [J]. Journal of Mining & Safety Engineering, 2014, 31(3): 441-446

[20] YangD-y, YangT-hongThermal environment in mine and its control [M], 2009Beijing, ChinaMetallurgical Industry Press