In situ stress measurements in some near-surface rock formations – Thorold, Ontario
1976; NRC Research Press; Volume: 13; Issue: 1 Linguagem: Inglês
10.1139/t76-001
ISSN1208-6010
Autores Tópico(s)Geotechnical Engineering and Underground Structures
ResumoPerformance of some structures constructed in rocks in southern Ontario have shown severe distress. It has been hypothesized that the problem is due to the high horizontal stresses existing in the rock formations. As part of a comprehensive investigation into the stress relief and time-dependent behavior of the rocks in this area, in situ stress measurements were carried out at a location near the Thorold Tunnel to a depth of 81 ft (25 m). The technique and procedure used are described in detail. It was found that high horizontal stresses, varying from 1200 to 2100 psi (8300 to 14500 kPa) exist in each rock unit encountered. The direction of the major principal stress in the horizontal plane appears to be orientated at N 60° E.
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