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pro vyhledávání: '"破壊開始条件"'
Publikováno v:
資源と素材. 117(4):265-270
Core disking is sometimes observed in high stress region where rock stress measurements are performed by the Compact Conical-ended Borehole Overcoring (CCBO) Technique, which is one of the stress relief methods. When the tensile stress induced on the
Publikováno v:
資源と素材. 114:875-880
Most of the overcoring method for rock stress measurements use a large diameter drilling, what is called the overcoring, to relieve the stress around a pilot hole in which a transducer is installed. When the overcoring is advanced into hard rock subj