Measurements of induced stress and strength in the near-field around a tunnel and associated estimation of the Mohr–Coulomb parameters for rock mass strength

Autor:	Yukifumi Ishiguro, Yuzo Obara
Rok vydání:	2004
Předmět:	Stress (mechanics) Compressive strength Rock mechanics Borehole Geotechnical engineering Geological Strength Index Mohr–Coulomb theory Geotechnical Engineering and Engineering Geology Rock mass classification Shear strength (discontinuity) Geology
Zdroj:	International Journal of Rock Mechanics and Mining Sciences. 41:761-769
ISSN:	1365-1609
DOI:	10.1016/j.ijrmms.2004.01.013
Popis:	The state of induced stress measured by the compact conical-ended borehole overcoring technique in the immediate roof of an approach tunnel excavated under high rock stress is described. During the measurements, core disking was observed. An X-ray Computed Tomography (CT) scanner was used to select strain data uninfluenced by the core disking; then the induced rock stress was estimated from selected strain data. From these results, it is shown that the non-destructive investigation using X-ray CT is effective for visualization of the fracturing within cores and the selection of strains measured during overcoring. Furthermore, the Mohr–Coulomb failure criterion parameters for the rock mass were estimated by comparing the measured stresses with the shear strength of in situ rock and the uniaxial compressive strength determined in laboratory tests.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::9224ac40bbe37727609a0fb57322e1fc https://doi.org/10.1016/j.ijrmms.2004.01.013 Zobrazit plný text záznamu Full Text from ScienceDirect