STUDY ON THE SURROUNDING ROCK PERMEABILITY OF A CERTAIN POTENTIAL RADIOACTIVE WASTE DISPOSAL SITE

The surrounding rock of a radioactive waste disposal site is granite. In order to evaluate the permeability of surrounding rock, the homogeneous zone was first divided into rock masses in the study area. In the homogenous area, based on numerous detailed joint geometry surveys, probability distribution functions of joint geometric parameters were analyzed. Based on Monte Carlo simulation and two-dimensional fractured rock mass hydraulics, a stochastic simulation and seepage calculation program for joint network was compiled based on Matlab. The statistical average of the principal permeability tensor, obtained by multiple sampling statistics. In order to make the value from the program more in line with the actual conditions of the project, the permeability tensor was revised by using the permeability coefficient obtained from the hydraulic pressure tests.