Continuous approach for coupled mechanical and hydraulic behavior of a fractured rock mass during hypothetical shaft sinking at Sellafield, UK
✍ Scribed by Kobayashi, A. ;Fujita, T. ;Chijimatsu, M.
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 799 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0148-9062
No coin nor oath required. For personal study only.
✦ Synopsis
An indicator simulation technique was used to infer the continuous hydraulic conductivity distribution in the BVG for Task 1A of DECOVALEX II. Young's modulus from the wireline geophysical survey was used as soft data. To calibrate the model with measured data in Task 1B, a back analysis with Bayesian estimate was applied to determine the hydraulic conductivity of all the elements of the finite element mesh. To avoid the ill-posed problem, a geostatistically kriged hydraulic conductivity distribution was used as mean a priori information. While there are some remaining problems, the solution was improved in comparison with the ordinary analysis. For the shaft sinking problem defined as Task 1C, the continuous approach to coupled mechanical and hydraulic behavior was used by combining crack tensor theory and the Barton and Bandis model for rock joints. The mechanical and hydraulic properties were derived with resultant anisotropy and heterogeneity during the simulated shaft excavation. It is found that the calculated hydraulic conductivity becomes larger than measured one as a consequence of excavation.