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裂隙岩体内水流-传热特征是评价高放废物处置库安全运行的重要组成部分。采用3DEC离散元软件建模,着重分析热源温度、裂隙水流速及裂隙开度对裂隙岩体温度的影响。在设定条件下,计算分析表明:(1)由于热传导与水流传热的不规则性,瞬态到稳态,上层岩石形成从下向上为主的传热路径,中、下层岩石形成从左向右为主的传热路径;岩石的温度梯度逐渐减小,裂隙两侧岩石等温线的不连续性逐渐增大;(2)斜裂隙水流与岩石热传导的耦合迟于竖裂隙水流与岩石热传导的耦合,岩石热传导与斜裂隙水流和邻近热源侧的竖裂隙水流对温度分布起控制作用;(3)热源温度越低,裂隙水流速越高,裂隙开度越大,岩石温度越低,系统达到稳态所需要的时间越短;(4)低流速裂隙水的热传导占主导作用,高流速裂隙水的对流传热占主导作用,裂隙交汇处存在局部热对流。
Water flow-heat transfer in fractured rock mass is an important part of evaluating the safe operation of HLW disposal repository. Using 3DEC discrete element software modeling, this paper focuses on the influence of heat source temperature, fissure water flow rate and fissure opening on the temperature of fissured rock mass. Under the set conditions, the calculation and analysis show that: (1) due to the irregularity of heat conduction and water heat transfer, transient to steady state, the upper rock forms the bottom-up heat transfer path, the middle and lower rock form the left (2) the coupling of oblique fissure water flow and rock heat conduction is later than the vertical fissure water flow and rock heat conduction (3) The lower the heat source temperature, the higher the fissure water flow rate, the larger the fissure opening and the lower the temperature of the rock, and the lower the temperature of the rock The shorter time it takes to reach steady state; (4) The heat conduction of fissure water at low flow rate plays a leading role. Convection heat transfer of fissure water at high velocity is dominant, and local convection at fissure confluence.