Characterisation of a fractured rock mass for a grouting field test

✍ Scribed by Å Fransson

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 239 KB
• Volume: 16
• Category: Article
• ISSN: 0886-7798
• DOI: 10.1016/s0886-7798(01)00060-8

✦ Synopsis

Än

investigation was performed to find and describe a rock volume suitable for a grouting field test at the Aspo Hard Rock Laboratory, Sweden. Fixed interval length transmissivities and the corresponding number of fractures from geological mapping of a probe hole were used to calculate a probability of conductive fractures for analyses of data from individual boreholes. Furthermore, the transmissivity and specific capacity of the boreholes were compared to examine the robustness of the specific capacity. From the findings of the study, the probability of conductive fractures from probe hole data, the specific capacity and fracture frequency of individual boreholes were sufficient to construct a simplified model of the fracture and the rock volume. Moreover, the median specific capacity of the boreholes was a good description of the effective cross-fracture transmissivity. The field test was also carried out to demonstrate the usefulness of the methodology for improving the analyses of data from the hydraulic tests and geological mapping for a grouting fan.