裂隙参数对岩体水流-传热温度影响的数值模拟分析

Numerical simulation analysis of the influence of fracture parameters on water flow and heat transfer temperature in rock mass

在岩体多场耦合中,裂隙岩体的温度场一直是国内外学者研究的热点问题。基于裂隙岩体概念模型,应用3DEC程序计算不同裂隙参数下岩体的温度场、裂隙出水口水温的变化特征。结果表明:裂隙相同进水温度对岩体温度场影响微弱,进水温度高的裂隙主导岩体温度场,裂隙进水温度对模型达到稳态所需要的时间影响较小;裂隙水流速度越大和开度越大,则岩体相同高度处温度越高;端裂隙水流速度的减小和开度的减小延长了模型达到稳态所需要的时间;由于两条端裂隙的边际效应,使其参数对岩体温度场起主导作用;裂隙水温、流速、开度对岩体温度场影响的大小排序为水温>流速>开度。

The temperature field of fractured rock mass in the multi-coupling field is a hot topic.The temperature field and outlet temperature of fractured rock mass were calculated under different fractured parameters by 3DEC program based on the conceptual model of fractured rock mass,and the results showed that the same inlet temperature of the fracture has a weak influence on the temperature field of the rock mass.The temperature field of rock mass is dominated by the high fractures intake temperature,and the time required for the model to reach steady state is slightly affected by the intake temperature of fractures.The higher the water flow velocity and opening of the fracture,the higher the temperature of the rock mass of the same height.The reduction of the water flow velocity and the opening of the end fracture extend the time required for the model to reach steady state.The parameters of the two end fractures play a leading role in the temperature field of rock mass due to the marginal effect,and the influence on rock mass temperature field from high to low ranks:fracture water temperature>water flow velocity>fracture opening.