STUDY ON CALCULATION AND DISTRIBUTION CHARACTERISTIC OF VERTICAL PERMEABILITY COEFFICIENT WITHIN CONDUCTION-CONVECTION TEMPERATURE FIRLD IN FISSURED ROCK ZONE
Abstract:The advantages with the use of the temperature field method to study the parameters of groundwater seepage field and the temperature characteristic of conduction-convection temperature field affected by vertical seepage are described briefly. According to the temperature characteristic curve of conduction-convection temperature field in aquifer and seepage filtration equations,the function relationship between temperature and depth is formed,considering the characteristic of temperature field affected by vertical seepage;and the vertical permeability coefficient is calculated via iterative equation and program. Based on the statistical characteristics of above results,a few samples following the normal distribution,the log-normal distribution and the uniform distribution are created respectively. Then,the model of evanescent expander-curve is presented;and the statistical characteristics of the vertical permeability coefficient and the three kinds of distributions are studied and contrasted. The results show that the probability distribution characteristic of the vertical permeability coefficient in fissured rock zone is much close to the log-normal distribution. Several complicated factors including subjective and objective ones can be avoided;and the process and analysis results are clear using the method of temperature field and statistics to study the parameters of groundwater seepage field such as the vertical permeability coefficient in fissured rock zone.