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土岩層中深開挖案例探討

Deep Excavation in Rock-A Case Study

摘要


本文為一在岩盤中深開挖的工程實例。工址位為台北市內湖區之山坡地。基地地質主要為砂岩及頁岩層,其上覆蓋厚度1公尺至10公尺不等之崩積或回填土,平均開挖深度約15公尺。基礎深開挖主要面臨以下三個問題:(1)北側山坡之邊坡穩定(2)東側邊坡上緊鄰建物之邊坡穩定及其安全(3)岩層深開挖之穩定。經由額外的工址調查(含地表地質調查)以及施工中良好的監測系統管理,成功的完成了在岩層中無支撐深開挖的例子。

並列摘要


This paper presents a case study on the deep excavation in rock. The project site is located on the hill side of Neihu, Taipei city. The underlying sandstone and shale are covered by colluvium of varying thickness from lm to 10m. The excavation is 15m deep. There are three major concerns: (1)stability of the slopes on the north side, (2)stability of the slope and the safety of the adjacent buildings on the east side, and (3)general stability of excavation in rock. Extensive site investigations have been carried out. The excavation has been successfully completed under a very comprehensive monitoring program.

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