摘要
为了研究巷道入口风温季节性变化下围岩温度场的变化规律,以及不同物理参数对围岩温度场的影响,根据能量守恒和傅里叶定律,建立围岩温度场导热方程,沿巷道轴向和围岩径向进行离散单元划分,应用有限差分法建立巷道入口风温季节性变化下围岩温度场数值解法,编制C#程序并以济宁三号煤矿为例进行模拟研究。结果表明:巷道入口风温季节性变化下围岩温度随与巷道中心距离的变化具有两区分布特征;径向上不同深度处围岩温度呈季节性变化且变化幅度随深度的延伸逐渐减小,深部围岩温度最大值或最小值出现的时间滞后于浅部围岩;地面气温年较差、采深及岩体导温系数对围岩温度场有着重要影响,风量对围岩温度场的影响主要表现在径向浅部围岩。
In order to investigate the variation law of the temperature field of surrounding rock under the seasonal change of wind temperature at the roadway entrance and the influence of different physical parameters on the temperature field of surrounding rock,the heat conduction equation of the temperature field of surrounding rock was established according to the energy conservation law and Fourier law.The discrete element partition was carried out along the axial direction of roadway and radial direction of surrounding rock.The numerical solution of surrounding rock temperature field under the seasonal variation of wind temperature at roadway entrance was established by using the finite difference method.The C#program was compiled and the simulation research was carried out in Jining No.3 Coal Mine.The results show that under the seasonal variation of wind temperature at roadway entrance,the variation of surrounding rock temperature with the distance from the center of roadway has two zone distribution characteristics;the surrounding rock temperature at different depths in the radial direction changes seasonally and the variation range gradually decreases with the extension of the depth,the maximum or minimum temperature of deep surrounding rock lags behind that of shallow surrounding rock;the annual range of surface air temperature,mining depth and thermal diffusivity coefficient of rock has an important influence on the temperature field of surrounding rock,and the influence of air flow on the temperature field of surrounding rock is mainly manifested in the radial shallow surrounding rock.
作者
高佳南
李超
吴奉亮
马砺
GAO Jianan;LI Chao;WU Fengliang;MA Li(College of Safety Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China;Key Laboratory of Western Mine Exploitation and Hazard Prevention,Ministry of Education,Xi'an 710054,China;Shaanxi Coal Chemical Industry Technology Research Institute Co.,Ltd.,Xi'an 710199,China)
出处
《矿业安全与环保》
北大核心
2021年第6期19-24,共6页
Mining Safety & Environmental Protection
基金
国家自然科学基金项目(51974232)
山东省重大科技创新工程项目(2019SDZY0205)。
关键词
矿井热害
季节性风温
巷道围岩
温度场
有限差分法
影响因素
mine thermal pollution
seasonal wind temperature
roadway surrounding rock
temperature field
finite difference method
influencing factor
