高原多年含水冻岩爆破炮孔温度-水分场耦合分析  

Coupling Analysis of Temperature and Water Field of Blast Hole for Multi-year Water-bearing Frozen Rock Burst in Plateau

作　　者：费鸿禄 甄帅 李文焱 胡刚 聂寒 FEI Hong-lu;ZHEN Shuai;LI Wen-yan;HU Gang;NIE Han(Institute of Blasting Technology,Liaoning University of Engineering and Technology,Fuxin 123000,China)

机构地区：[1]辽宁工程技术大学爆破技术研究院,阜新123000

出　　处：《爆破》2022年第4期32-43,共12页Blasting

摘　　要：为解决高原多年含水冻岩区露天矿山爆破作业过程中炮孔出现涌水、冰冻无法装药问题,以拉萨市墨竹工卡县甲玛露天矿为对象,基于弹性力学、达西定律、数学物理方法等理论,通过COMSOL-Multiphysics有限元模拟软件建立矿区成孔后温度变化模型,并利用SG-DTS-84U光纤测温仪现场试验结果对数值模拟结果进行验证,对比后发现模拟结果与现场试验结果具有较高的吻合度,由此证实了该模拟结果的正确性与科学性。在此基础上改变数值模型相关参数对不同外界环境下炮孔成孔后温度场变化规律进行研究,即分析炮孔成孔后温度-水分场耦合作用下24 h内不同地表温度、不同渗流速度对孔内温度的影响过程,研究矿区孔内温度场变化规律,以期进一步寻找根本解决冰冻孔装药的技术难题。通过研究结果表明:炮孔成孔后孔内冰冻深度主要受地表温度及渗流水速度控制,且地表深度≤6 m时孔内温度受外界温度影响大,深度>6 m时孔内温度主要受渗流水速度及孔壁原始温度影响;炮孔成孔后孔内温度在8 h时逐渐趋于稳定,其温度随深度的增加而降低;当渗流水速度≤5 m/h时渗流速度的变化对矿区温度场的发展规律具有显著影响,渗流水速度>5 m/h时渗流速度的变化对炮孔内温度场影响减弱。In order to solve the charge failure problems due to water gushing or freeze in the blasting process of an open-pit mine in plateau water-bearing frozen rock area for many years,Jiama open-pit mine in Mozhugongka County,Lhasa City is taken as the research object for coupling analysis in an temperature and water field.Based on the theories of elasticity,Darcy′s law and mathematical physical methods,the temperature change model of the mining area with drilled blast holes is established by the finite element simulation software COMSOL-Multiphysics.Then the numerical simulation results are verified by the field test results of the SG-DTS-84U optical fiber thermometer.After verification,it is found that the simulation results are in good agreement with the field test results,which confirms the correctness of the simulation results.On this basis,the relevant parameters of the numerical model are changed to study the change law of the temperature field after blasthole formation in different external environments.That is,in order to further find a fundamental solution to the technical problems of frozen hole charging,the influence process of different surface temperatures and seepage velocities within 24 hours under the coupling effect of temperature and water field on the change law of the temperature within the hole is analyzed.The research results show that the frozen depth in the blasthole is mainly controlled by the surface temperature and seepage water velocity.The temperature of the blast hole is greatly affected by the external temperature when the depth is less than 6 m,and the temperature of the blast hole is mainly affected by the seepage water velocity and the original temperature of the blast hole wall when the depth is more than 6 m.After the blast hole is formed,the temperature in the hole gradually tends to be stable after 8 h,and its temperature decreases with the increase of depth.When the seepage water velocity is less than or equal to 5 m/h,the change of seepage velocity has an impact on the develop

关 键 词：冰冻炮孔 高原高寒 温度场 水分场 COMSOL数值模拟 多场耦合 

分 类 号：TD982[矿业工程—选矿]