针对深部矿产资源开采所面临的矿井热害问题，利用载/蓄冷功能性充填技术，即在充填料浆中添加冰粒代替部分水，输送至与采场毗邻的采空区，通过冰粒的融化来吸收邻近采场区的热量是一种创新的矿井降温方法。本研究为揭示载/蓄冷功能性充填体辐射降温的机理，以载/蓄冷功能性充填体和采场空间为研究对象，通过实验和数值模拟探究载/蓄冷功能性充填体的辐射降温传热规律，探讨了材料特性、充填方式、壁面条件对降温效果的影响，得到的主要结论如下：

（1）搭建了载/蓄冷功能性充填体辐射降温系统平台，以模拟井下热场条件，获得不同条件下采场区降温特征，同时为验证数值模拟结果提供依据。

（2）建立了载/蓄冷功能性充填降温系统三维数值传热模型，可以准确描述该系统的传热规律，其中充填体区采用焓法模型与多孔介质模型，并以添加内热源的方式模拟水化放热；采场区采用DTRM辐射模型和自然对流模型。

（3）研究了载/蓄冷功能性充填体材料特性对其降温性能的影响，包括冰水初始液相率、充填体料浆浓度、充填策略。结果表明，降低冰水初始液相率，可以提高降温性能；在推荐的料浆浓度范围内，料浆质量浓度影响不显著；功能性充填体与传统充填体厚度之比为7：3时为最优。

（4）定义了无量纲温度、传热系数等参数对三种充填方式的传热性能进行评价，揭示了冷辐射面与冷却空间相对位置影响采场温度变化规律，结果表明：上向充填和下向充填在垂直于冷传递方向无量纲温度满足QP模型，壁式充填满足ExpDec1模型。下向充填传热速率最快，采场温度更加均匀。

（5）为提高载/蓄冷功能性充填体的降温效果，提出了主动降温、冷辐射面隔热、增强辐射率等单一优化方案，以及对这些单一优化方案进行联合优化分析。经比较，最佳辅助降温方案为在采场和载/蓄冷功能性充填体四周均采取主动降温。

本研究通过对载/蓄冷功能性充填体辐射降温机理及方法的探索，提供了解决深部矿井热害问题的新思路，为实现深部矿产资源可持续性开采提供了理论基础研究。

The cold load/storage (CLS) functional cemented paste backfill (CPB) technology is used for solving the problem of mine thermal damage in deep mining of mineral resources. That is, ice particles are used to replace part of the water in the backfill slurry. Then the backfill slurry is transported to the goaf adjacent to the stope. It is an innovative mine cooling method to absorb the heat in the adjacent stope area through the melting of ice particles. This study takes the CLS functional CPB region and the stope region as the research objects, and explores the radiant cooling and heat transfer characteristics through experiments and numerical simulation, and discusses the influence of material characteristics, backfill methods and wall conditions on the cooling effect, the main conclusions are as follows:

(1) A radiant cooling system platform with CLS functional CPB was built to simulate the underground thermal field conditions to obtain the cooling characteristics of the stope region under different conditions, and provide a basis for verifying the numerical simulation results.

(2) A three-dimensional numerical heat transfer model of functional backfill cooling system was established, and this model can accurately simulate the heat transfer characteristics of this system. The enthalpy model, and the porous medium model were used in the CLS functional CPB region, and the hydration heat release process was simulated by adding an internal heat source in the governing equation. DTRM radiation model and natural convection model were used in the stope region.

(3) The effects of the material characteristics of the functional backfill on its cooling performance were studied, including the initial ice-water liquid rate, slurry concentration and filling strategy. The results show that the cooling performance can be improved by reducing the initial liquid phase ratio of ice water. In the recommended slurry concentration range, the influence of slurry mass concentration is not significant. When the ratio of functional filling body to conventional filling body thickness is 7:3, it is optimal.

(4) The dimensionless temperature, heat transfer coefficient and other parameters were defined to evaluate the heat transfer performance of the three filling methods, and the relative position of the cold radiant surface and the cooling space affected the stope temperature change law. The results showed that: the dimensionless temperature perpendicular to the cold transfer direction of the upward and downward filling met the QP model, and the wall filling met the ExpDec1 model. The heat transfer rate of downfilling is the fastest, and the stope temperature is more uniform.

(5) In order to improve the cooling effect of the load/storage functional backfill, a single optimization scheme such as active cooling, heat insulation of the cold radiant surface and enhanced emissivity was proposed, and a joint optimization analysis was carried out for these single optimization schemes. By comparison, the best auxiliary cooling scheme is to take active cooling around stope and load/storage functional filling body.

By exploring the radiation cooling mechanism of the CLS functional CPB, this study broadens the idea for effectively solving the problem of thermal damage in deep mines, and provides theoretical basis for achieving sustainable mining of deep mineral resources.

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