台北盆地深開挖之可能破壞模式與機制

Possible Failure Patterns and Mechanisms for Deep Excavation in Taipei Basin

蔡錦松(Jiin-Song Tsai) ； 張家齊(Jia-Chyi Chang)

《地工技術》 54期 (1996/04) Pp. 15-24

https://doi.org/10.30140/SG.199604.0002

摘要

本文嘗試由地質分區之巨觀角度，探索台北盆地不同地區進行深開挖工程時應特別注意之可能破壞模式。主要藉由過去調查統計所得之數據以及所發生之案例作為依據，指出台北盆地中，基隆河流域地質區常見之破壞模式為開挖面隆起，其主要機制在於土體解壓與強度不足所發生之剪動；而淡水河新店溪流域地質區則以壁體滲漏或砂湧為主要模式，破壞機制之關鍵則在於地下水滲透流動。內容亦對前不久發生之鄭州路災變提出相關之破壞模式與機制，並初步探討其可能之破壞過程。結論指出，對於開挖工程，經驗法則應該要受到重視。

關鍵字

台北盆地 ； 深開挖工程 ； 破壞機制

並列摘要

This paper presents the possible failure patterns for deep excavation in Taipei Basin in view of geological characteristics. On the basis of previous studies, bottom heave is the main failure pattern commonly seen in Keelung river area, which is dominated by the mechanism of shearing due to soil's limited strength under unloading. Wall leakage or/and piping are main patterns occasionally occurred in Tamshui river and Hsintien river areas, which are dominated by the mechanism of groundwater seepage. With the basic understanding on failure patterns and corresponding mechanisms, an animation example is shown to illustrate the failure process of Chengchou Road failure occurred not too long ago. Conclusion indicates that engineers must pay attention to the rule of experience according to previous cases.

並列關鍵字

Taipei basin ； deep excavation ； failure mechanism