The Tseng-wen reservoir transbasin water tunnel project is being excavated in the Changchikeng sandstone in Taiwan, at a depth of up to 1,300 m. This study considers the accuracy of evaluations of the pre-stress of the deep rock obtained using acoustic emission (AE) and deformation rate analysis (DRA) on samples taken at outcrop. The cores were subjected to different stresses to simulate the pre-stresses present at the tunnel elevation and tested with different delay times. The results indicate that the AE method gave poor results compared with those obtained by DRA which correlated well with the "memorized" pre-stress (maximum error 29.61%). Delays of up to 14 days do not appear to have a significant influence on the pre-stress evaluation.
|Number of pages||11|
|Journal||Bulletin of Engineering Geology and the Environment|
|Publication status||Published - 2010 Mar 29|
All Science Journal Classification (ASJC) codes
- Geotechnical Engineering and Engineering Geology