Tunnel and Underground Space (터널과지하공간)
- Volume 4 Issue 1
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- Pages.55-62
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- 1994
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- 1225-1275(pISSN)
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- 2287-1748(eISSN)
Estimation of in-situ Stresses and the Effect of a Preexisting Inclined Fracture by Hydraulic Fracturing
수압파쇄를 이용한 초기지압측정과 기존경사균열의 영향
Abstract
The hydraulic fracturing in a field site was performed for the measurement of in-situ stresses. For the estimation of the effect of a preexisting inclined fracture, the test on a preexisting fracture zone was also conducted. From the measurements at three shallow depths, the ratios of max. to min. horizontal stress showed the range of 1.19-1.56 and the K values showed the range of 2.62-3.86. In case of a preexisting fracture with the inclination of 15 degrees, the stresses calculated as upper bound values by considering it. It seemed from this that the inclination less than 15 degrees had small effect on the stress calculation.
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