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In-Situ Stress Measurements for Excavation of Deep Cavern  

Lee, Hong-Gyu (두산건설주식회사 토목사업본부 토목설계팀)
Publication Information
Tunnel and Underground Space / v.19, no.6, 2009 , pp. 567-582 More about this Journal
Abstract
The world's largest nucleon decay experiment facility is constructed at a depth of approximately 1,000meters, in the Kamioka mine, Japan. Because of the character as a large cavern in deep underground, in-situ stress measurements were conducted to provide basic information for design of the cavern. Three overcoring methods were used: 8-element embedding gauges developed by Japanese Central Research Institute of Electric Power Industry, hemispherical ended borehole technique with eight strain cross-gauges, and Hollow Inclusion Cell with 12 strain gauges. The principle stresses were not perfectly similar in each measurement. The average values of the 6 stress element were used to provide the direction and the magnitude of three principle stress.
Keywords
Deep cavern; Initial stress; Overcoring;
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