• Title/Summary/Keyword: hydromechanical interactions

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A STUDY ON NUMERICAL COUPLING BETWEEN MECHANICAL AND HYDRAULIC BEHAVIORS IN A GRANITE ROCK MASS SUBJECT TO HIGH-PRESSURE INJECTION

  • Jeong, Woo-Chang;Jai-Woo;Song, Jai-Woo
    • Water Engineering Research
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    • v.2 no.2
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    • pp.123-138
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    • 2001
  • An injection experiment was carried ut to investigate the pressure domain within which hydromechanical coupling influences considerably the hydrologic behavior of a granite rock mass. The resulting database is used for testing a numerical model dedicated to the analysis of such hydromechanical interactions. These measurements were performed in an open hole section, isolated from shallower zones by a packer set at a depth of 275 m and extending down to 840 m. They consisted in a series of flow meter injection tests, at increasing injection rates. Field results showed that conductive fractures from a dynamic and interdependent network, that individual fracture zones could not be adequately modeled as independent systems, that new fluid intakes zones appeared when pore pressure exceeded the minimum principal stress magnitude in that well, and that pore pressures much larger than this minimum stress could be further supported by the circulated fractures. These characteristics give rise to the question of the influence of the morphology of the natural fracture network in a rock mass under anisotropic stress conditions on the effects of hydromechanical couplings.

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A Numerical Study on Hydraulic Behavior in a Fractured Rock Medium with Hydromechanical Interaction (수리역학적 상호작용을 고려한 균열암반매질에서의 수리학적 거동에 대한 수치적 연구)

  • Jeong, Woochang;Park, Youngjin
    • Journal of the Korean GEO-environmental Society
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    • v.10 no.2
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    • pp.61-68
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    • 2009
  • This paper presents the numerical investigation for the hydraulic behavior of a fractured rock mass with a hydromechanical interaction which may be considered during the in-situ hydraulic injection test. These experiments consist in a series of flow meter injection tests for fractures existing along an open hole section installed in a borehole, and experimental results are applied for testing a numerical model developed to the analysis and prediction of such hydromechanical interactions. Field experimental results show that conductive fractures form a dynamic and interdependent network, that individual fractures cannot be adequately modeled as independent systems, that new fluid intaking zones generate when pore pressure exceeds the minimum principal stress magnitude in that borehole, and that pore pressures much larger than this minimum stress can be further supported by the circulated fractures. In this study, these characteristics are investigated numerically how to influence the morphology of the natural fracture network in a rock mass by using a discrete fracture ntework model.

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A comparison study on coupled thermal, hydraulic, and mechanical interactions associated with an underground radwaste repository within a faulted granitic rock mass (화강암반내 단층지역에 위한 지하 방사성폐기물 처분장 인접지역에서의 열-수리-역학적 연성거동 비교 연구)

  • 김진웅;배대석;강철형
    • The Journal of Engineering Geology
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    • v.11 no.3
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    • pp.255-267
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    • 2001
  • A comparison study is performed to understand the coupling behavior of the thermal, hydraulic, and mechanical interactions in the vicinity of an underground radwaste repository, assumed to be located at a depth of 500 m, within a granitic rock mass with a 58$^{\circ}$ dipping fault passing through the roof-wall intersection of the repository cavern. The two dimensional universal distinct element code, UDEC is used for the analysis. The model includes a granitic rock meas, a canister with PWR spent fuels surrounded by the compacted bentonite inside a deposition hole, and the mixed bentonite backfilled in the rest of the space within a repository cavern. The coupling behavior of hydromechanical, thermomechanical, and thermohydromechanical interaction has been studied and compared. The effect of the time-dependent decaying heat, from the radioactive materials in PWR spent fuels, on the repository and its surroundings has been studied. A steady state flow algorithm is used for the hydraulic analysis.

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