수압파쇄 및 자연 균열의 수리역학적 동역학
Hydromechanical dynamics of hydraulic and natural fractures
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초록
지하 암반 내 유체 주입에 의한 수압파쇄 균열과 자연 균열의 수리역학적 거동과 관련하여균열 개폐와 압력 변수 관계, 응력 메카니즘 변화, 자연 균열의 미끄러짐-팽창 기준, 복합균열 교차 전파 등의 관계를 분석하였다. 자연 균열면의 열림 상태에 따라 균열 거동과 관련한 압력 변수 및 응력해석해 적용의 유효성에 차이가 있었다. 수압파쇄 균열과 자연 균열의 교차시에 수압파쇄 균열의 자연 균열 관통, 자연 균열의 미끄러짐 또는 팽창 열림 등의기준은 두 균열의 교차각, 주응력 방향과의 교차각, 주응력의 차, 균열면의 역학적 특성인점착력과 마찰계수 등에 의해 좌우된 다. 이러한 유체-불연속면 동역학적 거동 및 때로 수반되는 지진동 같은 현상의 관계 규명에는 미시역학적이고 정량 적인 연구와 평가기법 개발이 있어야 한다.
Abstract
This study analyzed the hydromechanical behaviors of hydraulic and natural fractures caused by fluid injection, such as fracture closing-reopening and the related pressure parameters, stress mechanism changes, slippage-dilation criterion of natural fracture, and complex fracture intersections. When hydraulic and natural fractures intersect, the conditions for crossing, slippage, and dilation depend on intersection angles between fracture and stress direction, differential stress, and mechanical properties such as cohesion and friction coefficient of the fractures. Micro-mechanical and quantitative assessment technologies should be further developed for the analyses of fluid-fracture dynamics and the induced seismicity-like phenomenon.
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