석회석광산 주변 암반의 수리학적 모델링에 관한 연구
A Study on the Hydraulic Modelling of the Rockmass in a Limestone Mine
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초록
암반 내 터널이나 지하공동 등의 굴착을 위해서는 지하수의 유동해석이 중요한 요소이며, 본 연구에서 는 석회석 광산주변의 암반의 수리학적 특성에 대한 암반균열의 영향을 확률론적 방법론에 기반한 삼차원 불연속체 모델링 방법을 적용하여 분석하였다. 암반의 3차원 분열균열망(DFN) 모델링을 위하여 암반균열의 방향성, 크기, 길이, 체적밀도 등의 자료를 조사선법과 조사창법에 의하여 수집하였다. 현장에서 얻은 자료들은 통계처리한 후 지하수 유동해석 프로그램인 FracMan/MAFIC을 구동하여, 갱도주변 암반의 수리지질학적 특성과 경계조건의 변화에 따른 지하수의 갱내 유입량을 추정하였다. 또한, 암반의 투수량계수 및 간극을 변화시키면서 지하수 유입량의 변화를 분석하였으며, 이로부터 투수량계수 및 간극의 변화가 갱도 내부로의 지하수유입에 상당한 영향을 미칠 수 있음을 확인하였다.
Abstract
Analysis of groundwater flow is a key aspect especially for excavations of tunnels and underground caverns. In this study, a three-dimensional joint model based on the stochastic method has been adopted for analyzing the influence of rock fractures on the hydraulic properties of rockmasses in a limestone mine. For three-dimensional discrete fracture network (DFN) modelling of the rockmass, both scanline and window surveys were performed to collect the field data, including the orientation, size, length, intensity of rock fractures. Fracture properties retrieved from the statistical analysis of the field data were adopted for the FracMan/MAFIC to analyze the inflow flux through the rockmass around mine tunnel, by applying different boundary conditions around the mine tunnel. Also, with varying transmissivity and aperture values, the influence of the hydraulic properties of rock fractures on the inflow flux were analyzed. According to the results, the aperture and transmissivity change, presumably induced by the rockmass disturbance during excavation process will be one of the most important factors influencing the groundwater inflow into the mine tunnel.
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