深開挖管湧災變處置案例

Case History on Piping Failure and Remedial Measures for a Deep Excavation

劉國鎮(Gwo-Jenn Liu) ； 段紹緯(Shaw-Wei Duann) ； 王劍虹(Chien-Hong Wang) ； 王瑞芳(Rei-Fung Wang)

《地工技術》 66期 (1998/04) Pp. 65-74

https://doi.org/10.30140/SG.199804.0006

摘要

本文描述位於臺灣南部港口碼頭之深開挖工程，於13.75公尺開挖完成，在構築大底組紮鋼筋期間，發生管湧破壞案例。針對管湧災變發生經過，原因及修復設計，加以分析說明；修復設計採用填充及止水灌漿，配合降水措施及監測系統完成本工程之修復。本管湧案例導致破壞之原因，可能係由於開挖面下方具有黏土夾層，加上颱風帶來大量豪雨，造成黏土層下方水壓上升，導致管湧破壞。

關鍵字

管湧 ； 灌漿 ； 透水試驗 ； 修復設計

並列摘要

This paper presents the sequence, failure mechanism and remedial measures of a piping failure occurring during a deep excavation at a harbor in southern Taiwan. The piping failure occurred after a 13.75 m deep excavation had been completed and after 5 days heavy raining. The causes of the pipping failure could be associated with the presence of a thin clay blanket below the bottom of excavation, together with the rising of groundwater table due to waves and heavy rains brought by a typhoon. After the incident, the remedial measures taken included instrumentation, groundwater pumping as well as grouting to fill cavities and to stabilize disturbed soils.

並列關鍵字

piping ； grouting ； permeability test ； remedial measure