Determining conductivity of fractured rock mass and associated transmissivity for fracture sets using in-situ hydrogeological tests
Journal
Rock Characterisation, Modelling and Engineering Design Methods
ISBN
9781315884929
Date Issued
2013-05-17
Author(s)
Abstract
The naturally existing fractures in a rock mass induce heterogeneity and anisotropy for its engineering properties, resulting in difficulties for investigation on hydrogeological characteristics of fractured rock masses. Aiming to gain more insight into the difference of permeability of distinct fracture sets in a rock mass and associated influence on the equivalent permeability of the rock mass, this study adopts statistical analyses to estimate the hydrogeological characteristics from a series of in-situ test results. There are 10 boreholes drilled within a radius of 9.2m in a wells site with more than 50 testing results for conductivities. The hydraulic conductivity obtained from distinct hydrogeological tests can differ several orders, depending on number of fractures, fractural set and fractural conditions comprised in the testing section. Furthermore, statistical analysis for the testing results determines the transmissivity for distinct fractural sets, which provides an alternative for relevant investigation of in-situ hydrogeological tests.
Type
book part