Li Yanhe, Wan Zhijun, Yu Zhenzi, Shi Peng, Zhang Bo, Zhang Yuan
Pingdingshan Tianan Coal Mining Co., LTD., Pingdingshan, 467009, China.
School of Mines, China University of Mining and Technology, Xuzhou, 221116, China.
Sci Rep. 2024 Jun 18;14(1):14096. doi: 10.1038/s41598-024-64702-4.
In hydrothermal high-temperature abnormal mines, the composite heat-insulation zone structure, formed through a combination of guniting and grouting, serves to mitigate heat dissipation from the surrounding rock into the airflow. To comprehensively understand the thermal insulation performance of the composite heat-insulation zone structure, this study employs numerical simulation to analyze the following aspects: the variation in the temperature field within the surrounding rock of the roadway without insulation, the influence of structural parameters of the composite heat-insulation zone on temperature distribution in the surrounding rock of the roadway, and the thermal insulation effectiveness of the composite heat-insulation zone with varying structures. The findings indicate that the temperature distribution within the surrounding rock of the roadway lacking a heat-insulation zone is relatively uniform. However, as ventilation time extends, the heat regulation zone within the surrounding rock gradually extends deeper, ultimately forming an elliptical cooling area. The composite heat-insulation zone structure effectively mitigates heat transfer from deeper surrounding rock to the roadway wall, consequently altering the scope of the roadway's heat regulation zone. Enhancing the thermal insulation performance of the composite heat-insulation zone structure can be achieved by increasing the thickness of the thermal insulation layer, adjusting grouting rate and depth, and reducing the thermal conductivity of insulation materials. The thermal insulation effectiveness of the thermal insulation layer surpasses that of the grouting layer, with its performance primarily influenced by the thermal conductivity of the materials used. Simulation results demonstrate that the composite heat-insulation zone structure reduces the maximum heat flux on the roadway wall from 47.4 to 37.7 W/m, resulting in a 20% reduction in heat transfer from deeper surrounding rock. These findings offer valuable insights for implementing thermal insulation techniques in hydrothermal high-temperature anomaly mines.
在高温热害矿井中，通过喷射混凝土与注浆相结合形成的复合隔热带结构，可减少围岩向风流的散热。为全面了解复合隔热带结构的隔热性能，本研究采用数值模拟分析以下方面：无隔热措施时巷道围岩内温度场的变化、复合隔热带结构参数对巷道围岩温度分布的影响以及不同结构复合隔热带的隔热效果。研究结果表明，无隔热带巷道围岩内的温度分布相对均匀。然而，随着通风时间的延长，围岩内的热调节带逐渐向深部扩展，最终形成椭圆形冷却区域。复合隔热带结构有效减少了深部围岩向巷道壁的热传递，从而改变了巷道热调节带的范围。通过增加隔热层厚度、调整注浆量和深度以及降低隔热材料的导热系数，可以提高复合隔热带结构的隔热性能。隔热层的隔热效果优于注浆层，其性能主要受所用材料导热系数的影响。模拟结果表明，复合隔热带结构使巷道壁上的最大热流从47.4 W/m降至37.7 W/m，深部围岩的热传递减少了20%。这些研究结果为高温热害异常矿井实施隔热技术提供了有价值的见解。
