深部矿产资源及地热协同开采，已成为深化我国能源可持续发展战略的重要举措，促使其采热过程中热量高效并且持之以恒地传入采热介质，是保障采热系统长期运行稳定性和高效性、实现矿山地热可持续利用的关键环节，但目前与之相关的研究尚未深入开展。为此，本项目提出了以管群换热充填体为基本采热单元的间歇采热策略，拟通过实验测试、理论分析及数值模拟，探索换热充填体热物性与其材料基质间的内在关联，形成充填体热物性预测方法；建立表征管群换热充填体耦合热迁移特性的数值模型，获悉多因素协同作用下管群换热充填体热传递机理，揭示系统换热性能与其结构参数及管内流体参数的匹配关系；明晰换热充填体在采热、停运阶段下的温变特性，发展耦合系统采热、停运两阶段热传递过程的数学模型，阐明管群换热充填体采热-停运周期组合与其长期采热性能的关联机制，形成管群换热充填体间歇采热方法及其性能优化策略，为矿山地热可持续开采提供理论依据与技术支撑。

The collaborative exploitation of deep mine and geothermal energy has been a significant measure for the sustainable energy development strategy in China. The efficient and durable heat transfer into heat absorbing medium has a crucial effect on the stability and efficiency of system’s long-term operation as well as the sustainable utilization of mine geothermal energy. However, there is a lack of studies fully delved into the corresponding issues. To solve the above problems, this project proposes an intermittent operation strategy for deep mine geothermal exploitation, which takes the combination of backfill body and heat exchange pipes (CBHEP) as the basic heat transfer unit. By theoretical analysis, experimental measurement and numerical simulation, we will investigate the relationship between thermal properties of backfill body and its material compositions, to establish the theoretical method for the prediction of backfill body thermal properties, after that develop the simulation model to illustrate the dynamic-coupled heat exchange in CBHEP, to demonstrate the heat transfer mechanism of heat exploitation system under the influence of multi-factor as well as the interaction between pipe geometrical parameters, fluid parameters and the heat exchange performance of system. We will reveal the temperature variation characteristics of backfill body during system operation and heat recovery statuses, respectively, to propose a theoretical model that couples heat transfers processes under both operation and heat recovery statuses, then illustrate the effects of matching modes of operation and stop durations on the long-term heat transfer performance of system, finally provide an intermittent operation approach and an optimization strategy for the heat exploitation system. The results of this project can theoretically and technically support the sustainable utilization of deep mine geothermal energy.