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Since early in the 90's, as the need for construction of underground rock structures has been largely increased, the in-situ rock stress measurement has been widely carried out to provide the quantitative information on the initial stress state of test site at the design stage of underground rock st...

Since early in the 90's, as the need for construction of underground rock structures has been largely increased, the in-situ rock stress measurement has been widely carried out to provide the quantitative information on the initial stress state of test site at the design stage of underground rock structures. Among the diverse method developed for measuring rock stress, hydraulic fracturing method is most popularly used because it is applicable at pre-construction stage and has no limit in testing depth. In this paper a study on initial rock stress state at shallow depth of the plain gneiss region in the central part of Seoul was performed on the basis of the in-situ hydraulic fracturing stress measurement results from the 11 test boreholes. And overall characteristics of the initial stress field of the study area are discussed.

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