Experimental validation of core-based pre-stress evaluations in rock: A case study of Changchikeng sandstone in the Tseng-wen reservoir transbasin water tunnel

Jian-Hong Wu, Shu Chi Jan

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)549-559
Number of pages11
JournalBulletin of Engineering Geology and the Environment
Volume69
Issue number4
DOIs
Publication statusPublished - 2010 Mar 29

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Geology

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