本研究主要目的為探討不同破裂面中水流動之行為,首先將前人提出之四種評估破裂面內寬模式加以比較並探討各模式組成之參數,接著利用PHOENICS數值軟體,以平行板理論中水力內寬之觀念來探討在不同節理內寬及節理粗糙度之條件下對水流之影響。本研究將數值模擬結果與此四種評估模式相比較,結果顯示,力學內寬與節理粗糙標準偏差之比值大於8.0時,代表粗糙度不易影響水流狀況,此時利用平行板模式來模擬節理面水流狀況有良好的效果;比值介於3.0至8.0時,各模式因假設條件及理論不同而有差異,但仍能適切描述此區導水性與力學內寬與節理粗糙標準偏差之關係,可依破裂面特徵選擇不同估計模式;比值小於3.0時,各模式差異甚大,無法觀察出此區之水流情形,因此不建議使用各模式來探討。
The purpose of this study is to evaluate hydraulic aperture in single fracture. First, four empirical models were compared with parameters of them. Then the results of numerical simulations by program, PHOENICS, in different aperture combinations and roughness conditions were discussed with the previous models. The results indicate that the ratio of the mean aperture to its standard deviation is an important factor of hydraulic aperture. So the relationship with the ratio and hydraulic aperture could be divided into three parts that the estimating empirical models is according to different roughness conditions.