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 development of the temperature field in the mining area.On the contrary,when the seepage water velocity is greater than 5 m/h,the change of the seepage velocity has a weakened effect on the temperature field in the blasthole.