| 摘要: | 本文針對裂隙岩體裂隙程度(P32)與水利傳導係數之表徵單元體積(REV)進行探討。本文利用FracMan軟體作為生成離散裂隙網絡(DFN)之工具以模擬岩體裂隙。裂隙程度部分，本文設計一系列之參數研究，包括：傾角、傾向、費雪常數、岩體模型尺寸與形狀、取樣尺寸、裂隙直徑與岩體裂隙程度進行探討，量化各參數對於量測P32變異係數之影響，提出一計算量測P32之變異係數的方程式，其方程式以取樣體積、裂隙直徑及P32表示，並引入可接受之變異係數，即可計算岩體之幾何表徵單元體積。此外本文也利用數個現地案例進行探討並驗證此一方程式之正確性與應用性。
水利傳導係數部分，本文利用FracMan中兩個不同計算水利傳導係數之模式(Conventional Oda與Oda gold)設計一系列之參數研究，Conventional Oda部分包括：取樣尺寸、裂隙直徑、岩體裂隙程度、導水係數與破裂面開口寬進行探討；而Oda gold部分僅針對岩體裂隙程度進行探討。最後本文利用蒙地卡羅模擬以決定水利傳導係數之表徵單元體積。
;This study presents the representative elementary volume (REV) of P32 (fracture intensity) and hydraulic conductivity of fractured rock mass. Discrete fracture network (DFN) generated by FracMan is adopted to create rock mass models. A series of parametric studies including dip angle, dip direction, Fisher constant κ, size of rock mass model, shape of rock mass model, specimen volume, fracture diameter, and P32 were investigated to study the REV of P32. Based on the results of the parametric studies, a novel equation to quantify the COV (Coefficient of variance) of P32 in terms of specimen volume, fracture diameter and P32 was established. A precise REV size can be obtained easily by assigning the acceptable COV. Thereafter, some case studies were used to verify the proposed novel equation.
Conventional Oda and Oda gold were adopted to estimate the hydraulic conductivity of the fractured rock mass. By using Oda conventional, a series of parametric studies including specimen volume, fracture diameter, P32, transmissivity, and aperture were investigated to study the REV of hydraulic conductivity. Subsequently, that REV of hydraulic conductivity was compared with the REV of P32. In the other hand, by using Oda gold, only P32 was chosen as parametric study. Eventually, a proposed new method was conducted by examining the Monte Carlo simulation for REV of hydraulic conductivity determination. |
