Characteristics of the Regional Rock Stress Field at Shallow Depth in the Kyungsang Basin with In-situ Rock Stress Measurement

현장 측정을 통한 경상분지의 천부 초기응력장 특성에 관한 연구

  • 배성호 ((주)지오제니 컨설턴트) ;
  • 전석원 (서울대학교 공과대학 에너지시스템공학부) ;
  • 김재민 ((주)지오제니 컨설턴트 지반사업부) ;
  • 김장순 ((주)지오제니 컨설턴트 지반사업부)
  • Published : 2008.04.30

Abstract

It is nearly impossible to estimate the exact state of the current rock stress of interest site by the theoretical and physical approaches except some specific geological situations. This means that in-situ stress measurement is a unique way to obtain reliable information on rock stress especially for civil and mining engineering related problems. Since late in the 90's, in-situ rock stress tests have been widely conducted to provide the quantitative information on the stress state of engineering site at the design stage of an underground rock structure in the Kyungsang Basin, Korea. The study area is the near surface regions at the depth less than 300 m in the Kyungsang Basin. It includes Yeosoo to the west and Busan to the east. Totally, 270 in-situ stress measurements were conducted in the surface test boreholes at the depth from 14 m to 300 m by hydraulic fracturing method. In this paper, based on the measurement data set, the overall characteristics of the current in-situ rock stress fields in the study area are briefly described. And also the investigation results on the difference between the stress distributions for the granitoid and the andesitic rock region are also introduced. Finally, the distributions of the regional horizontal stress directions in Busan and the Yangsan faults area are shown.

Keywords

In-situ rock stress;Hydraulic fracturing test;Kyungsang Basin;stress ratio (K);Excessive horizontal stress

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