隧道破裂面露頭與湧水量關係之研究

The Effect of Fracture Outcrops around Tunnel on Seepage

林宏奕(Hung-I Lin) ； 翁淑涵(Shu-Han Wong) ； 李振誥(Cheng-Haw Lee)

《中國土木水利工程學刊》 23卷3期 (2011/09) Pp. 287-295

https://doi.org/10.6652/JoCICHE.201109_23(3).0005

摘要

破裂面幾何參數是探討破裂岩體水力學行為，以及隧道滲流量相關研究之重要依據，然水力邊界上之破裂面露頭將控制水流出入岩體之通道，成為影響水流通路之重要條件。本研究採用二維隨機離散破裂面程式TUNFLOW，探討破裂岩體露頭與水力傳導係數，及隧道壁露頭與湧水量之關係。結果顯示破裂面網路存在有效及無效破裂面，且破裂面密度、長度為控制露頭數最大因素，與破裂面水力參數之相關性極佳。而有效露頭數在破裂岩體水力參數及隧道湧水估計時，為有效及重要之參考依據。最後以露頭數推估隧道湧水量模式應用於雪山隧道，結果頗符合現場量測資料。

關鍵字

破裂岩體 ； 隧道湧水量 ； 露頭 ； 有效破裂面

並列摘要

Parameters of fractures are the basic components of hydraulic models in fractured rocks. However, the outcrops of fractures on the hydraulic boundary are the actual passages of inflow and outflow in fractured rocks and tunnel wall. The computer code, TUNFLOW, which base on the discrete fracture model is applied to estimate the hydraulic conductivity and outcrops of simulated cases in this research. The results show that the preferential path exists in partial fracture net. Density and trace length of fractures are the major factors to amount of the effective outcrops, which are the outcrops that groundwater passed. There is a fairly relation between seepage and outcrops on the tunnel wall. This result could be used in estimating the groundwater surge with number of outcrops, and result in the case of Syueshan tunnel is very close to the record in-situ.

並列關鍵字

fractured rock mass ； seepage ； fracture outcrops ； effective fracture