Study On Heat-fluid Model In Fractured Rock Mass

Leakage is one of the important factors that influence the safety of project in fractured rock mass areas. Based on the study of extensive domestic and foreign literature, the distribution characteristics of seepage field and temperature field is studied, and the heat-fluid model which can reflect seepage and temperature distribution of fractured rock mass objectively is established. According to the fundamental of fluid mechanic and thermal conduction, the temperature distribution characteristic of flat-slab and column seepage in rock mass areas is analyzed. Besides, some influence factors, such as amount of seepage, temperature difference between fluid and rock et al are discussed. Therefore, seepage volume, equivalent hydraulic aperture could be calculated by spot temperature data. At last, a case is given, which confirm the validity of such theory. The major contents are as follows:(1) The distribution and interrelation between seepage field and temperature field are analysed. Big fracture and fault play an important role in water conducting within the whole seepage areas, which dominate the distribution of temperature field. Due to the entering of low temperature water, fracture became the lowest temperature plane of the whole temperature field with the isotherm parallelling to fracture strike.(2) Profits from parallel plate model in fracture seepage, a parallel plate Heat-fluid model is established. Considering the seepage dominate effect of fracture, and convective heat transfer, based on momentum conservation, mass conservation and energy conservation, a 1D and 2D model under steady and transient state is established respectively, then the solution of each model is performed.(3) Compared with the parallel plate Heat-fluid model, a columniform Heat-fluid model was established. There are also many columniform leakage passages in fracture mass areas based on field information, so it is necessary to set up a columniform Heat-fluid model, which also including 1D and 2D model under steady and transient state. The analytical solutions of those models are calculated by means of mathematical physical method.(4) Combining with the construction practice, the model is applied to study the leakage field distribution, to calculate the hydrogeology parameters. The result is near to field test results, which confirm the correctness of model.