正交与非正交稀疏裂隙岩体水流-传热对温度影响的数值分析

Numerical Analysis of Water Flow and Heat Transfer Influence on Temperature in Plutones With Sparse Orthogonal and Non-orthogonal Fracture

为研究正交与非正交稀疏裂隙岩体水流-传热对温度的影响,采用三维离散单元法程序(3 Dimension Distinct Element Code,简称3DEC)分析正交与非正交稀疏裂隙岩体水流-传热对温度场影响规律。研究表明:正交裂隙水流显著改变了岩体温度场;由于交叉裂隙水流动传热,致使裂隙水流动区域等温线出现明显的断续态,从瞬态到稳态,岩体温度升高,温度梯度逐渐减小。对比正交裂隙岩体模型,当横裂隙向下倾斜,纵裂隙靠近热源时,裂隙岩体温度升高;对比非正交裂隙岩体模型,当横裂隙倾斜度不变,纵裂隙远离热源时,裂隙岩体温度降低。非正交裂隙出水口水温高于正交裂隙出水口水温,纵裂隙靠近热源时裂隙出水口水温高于纵裂隙远离热源时裂隙出水口水温;非正交裂隙岩体模型比正交裂隙岩体模型达到稳态所需要的时间更短,纵裂隙靠近热源时的模型比纵裂隙远离热源时的模型达到稳态所需时间更长。

In order to study the effect of water flow and heat transfer on temperature in pluton with sparse orthogonal and non-orthogonal fracture,3 DEC software was used to analyze the distribution pattern of water flow and heat transfer on temperature.The result show that:(1)water flow in pluton with orthogonal fracture significantly changes the temperature field;Due to water flow and heat transfer of the cross fracture,the isotherm of the fracture water flow area present obviously discontinuous state.The temperature of the pluton increases and the temperature gradient gradually decreases;(2)with the orthogonal fractured pluton model,the temperature of the fractured pluton increases from transient state to steady state when the transverse fracture inclines downward and the longitudinal fracture inclines toward the heat source,while in the non-orthogonal fractured pluton model,the temperature of the fractured pluton will decreases from transient state to steady state when the inclination of the transverse fracture is constant and the longitudinal fracture inclines away from the heat source;(3)the water temperature of the non-orthogonal fracture outlet is higher than that of the orthogonal fracture outlet,and the water temperature of the non-orthogonal fracture outlet is higher than that of the non-orthogonal 1 fracture outlet.The time required for the non-orthogonal fractured pluton model to reach steady state is shorter than that for the orthogonal fractured pluton model,and the time required for the non-orthogonal fractured pluton model to reach steady state is longer than that for the non-orthogonal fractured pluton model 1.