Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
AECL's excavation stability study - summary of observations
The Excavation Stability Study (ESS) was conducted at the 420 Level of the Underground Research Laboratory (URL) to evaluate stability and the extent of excavation damage in tunnels as a function of tunnel geometry and orientation, geology, and excavation method. A series of ovaloid and circular openings were used to achieve different boundary stress levels and near-field stress distributions to assess the effect of tunnel geometry on damage development. Several of these openings had sections in both granite and granodiorite lithology, providing a comparison of damage in rock types with different strength characteristics. Damage around circular tunnels (one excavated by drill-and-blast, the other by mechanical means) was also investigated. The study showed that mechanically stable openings can be excavated in the most adverse stress conditions at the 420 Level of the URL. In addition, it was shown that tunnel stability is sensitive to tunnel shape, variations in geology, and to some extent, the excavation method. Findings of the study are relevant in developing design criteria, and in assessing the feasibility of constructing large ovaloid openings in adverse stress conditions. This report summarizes the preliminary observations related to tunnel stability and excavation damage. (author). 8 refs., 7 tabs., 23 figs. (Atomindex citation 28:073152)
AECL's excavation stability study - summary of observations
The Excavation Stability Study (ESS) was conducted at the 420 Level of the Underground Research Laboratory (URL) to evaluate stability and the extent of excavation damage in tunnels as a function of tunnel geometry and orientation, geology, and excavation method. A series of ovaloid and circular openings were used to achieve different boundary stress levels and near-field stress distributions to assess the effect of tunnel geometry on damage development. Several of these openings had sections in both granite and granodiorite lithology, providing a comparison of damage in rock types with different strength characteristics. Damage around circular tunnels (one excavated by drill-and-blast, the other by mechanical means) was also investigated. The study showed that mechanically stable openings can be excavated in the most adverse stress conditions at the 420 Level of the URL. In addition, it was shown that tunnel stability is sensitive to tunnel shape, variations in geology, and to some extent, the excavation method. Findings of the study are relevant in developing design criteria, and in assessing the feasibility of constructing large ovaloid openings in adverse stress conditions. This report summarizes the preliminary observations related to tunnel stability and excavation damage. (author). 8 refs., 7 tabs., 23 figs. (Atomindex citation 28:073152)
AECL's excavation stability study - summary of observations
R. S. Read (Autor:in) / N. A. Chandler (Autor:in)
1996
46 pages
Report
Keine Angabe
Englisch
Geology & Geophysics , Soil & Rock Mechanics , Radioactive Wastes & Radioactivity , Radiation Shielding, Protection, & Safety , Atomic Energy of Canada LTD , Excavation , Underground Disposal , Geologic Fractures , Stability , Stress Intensity Factors , Tunneling , Canada , Underground Facilities , Foreign technology , EDB/540250 , EDB/052002
| British Library Conference Proceedings | 1996
In Situ Stress Domains at AECL's Underground Research Laboratory
| British Library Conference Proceedings | 1990
In situ thermal testing at AECL's underground research laboratory
| British Library Conference Proceedings | 1996
Geological Characterization of AECL's Underground Research Laboratory: Methods and Accomplishments
| British Library Conference Proceedings | 2003