曾文水庫越域引水隧道工程湧水評估

Assessment of Inflow for the Transbasin Diversion Tunnel of Tsengwen Reservoir

楊豐榮(F.R. Yang) ； 龔文瑞(W.J. Kung) ； 李振誥(C.H. Lee) ； 林宏奕(H.I. Lin)

《鑛冶：中國鑛冶工程學會會刊》 48卷4期 (2004/12) Pp. 29-41

https://doi.org/10.30069/MM.200412_48(4).0003

摘要

本文以曾文水庫越域引水隧道現場實測資料建構二維水文地質模型，配合有限差分數值軟體MODFLOW，評估隧道穿越高中斷層破碎帶前後所遭遇湧水情形、隧道開挖平均瞬間湧水量與累積湧水量關係、平均瞬間湧水量與地下水位關係。研究結果顯示，當隧道開挖至荖濃斷層與老人溪背斜軸部之間的區域時會有較大瞬間湧水量，其值約為0.505 l/s．m～4.71 l/s．m之間；高中斷層破碎帶內具有較高的地下水位，且為一高滲透性的含水帶，可能造成4.71 l/s．m的最大瞬間湧水量。

關鍵字

隧道 ； 湧水 ； 水文地質模型

並列摘要

The research is to establish a two-dimensional hydrogeological model to assess the inflow of the eastern part of transbasin diversion tunnel of Tsengwen Reservoir. The computer program, MODFLOW, is applied to estimate the variance of inflow during the excavation period and evaluate the instant inflow and the accumulated inflow against the ground-water level. The results show that when the tunnel passes through vicinity of Laonung fault and the hinge of Laorenxi anticline, the greatest instant inflow is occurred and the value is about from 0.0505/l/s．m to 4.71 l/s．m; When through Kaochung fault with the higher water table and high-permeability, the value of the greatest instant inflow is about 4.71 l/s．m.

並列關鍵字

Tunnel ； Inflow ； Hydrogeological model