隧道破裂面幾何特性對隧道滲流量之探討

Relation between Fractured Geometric Parameters and Groundwater Seepage of Tunnel

潘建邦(C. P. Pan) ； 林宏奕(H. I. Lin) ； 林碧山(B. S. Lin) ； 李振誥(C. H. Lee)

《鑛冶：中國鑛冶工程學會會刊》 54卷3期 (2010/09) Pp. 42-52

https://doi.org/10.30069/MM.201009.0004

摘要

破裂面幾何特性是探討破裂岩體水力行為及預測隧道滲流量之重要因子，本研究以二維隨機離散破裂面程式TUNFLOW為基礎，利用序率方法產生隨機實現值案例，統計模擬結果後加以分析，並應用於雪山隧道進行驗證。研究顯示破裂面內寬變化對滲流量扮演重要角色，破裂面內寬愈大，則地下水滲流量也愈大，破裂面密度愈大（即節理間距越小）與破裂面長度愈長，形成破裂面網路交接度愈高，則地下水滲流量也愈大。地下水流通過破裂面網路時，將於較易通過之連結破裂面形成水力路徑，故破裂面網路存在著水力有效及無效破裂面。破裂面密度及長度為控制有效露頭數之最主要因素，可用來評估隧道滲流量。

關鍵字

破裂岩體 ； 破裂面幾何特性 ； 露頭 ； 隧道滲流量

並列摘要

Fractured geometric parameters are important factors to investigate the hydraulic behavior in fractured rock mass and estimate the seepage in tunnels. The computer code, TUNFLOW, which base on the discrete fracture model is applied to produce random realizations and analysis the results. Then apply the result to the Syueshan tunnel to estimate. Results show that groundwater seepage in tunnel is influenced by aperture width, fracture density, trace length and the interconnction of fractures. The most significant factor for the seepage is the change of aperture width. The results also show that groundwater will not pass all the fractures in the fracture net and the preferential path exist in partial cases. When density is extremely small, the simulation results of seepage by discrete fracture model can be approach to zero. Results could be used in evaluating the groundwater surge with number of outcrops.

並列關鍵字

Fractured rock mass ； Geometric parameters ； Outcrop ； Seepage