Abstract
An initial stress state considerably affects the stability of an underground opening. In this paper, the authors collect and arrange the data measured at 41 points in Japan by stress relief methods, and discuss the general tendency of initial stress state in Japan. The results exhibit that the magnitude of the vertical stress is close to the overlying rock weight in the most cases, however, the horizontal stress varies with directions and the magnitude of minimum horizontal stress often exceeds that of the vertical stress. The directions of minimum horizontal stresses seem to be consistent with those implied by the geodetic strains. Therefore, the large horizontal compressive stresses in Japan can be affected greatly by crustal movements.
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