淺論雙排鋼軌樁無支撐工法

A Note on the Behavior of Double-Rail Earth Retaining System

謝旭昇(Hsii-Sheng Hsieh) ； 石強(Chiang Shih) ； 林婷媚(Ting-Mei Lin)

《地工技術》 97期 (2003/09) Pp. 5-14

https://doi.org/10.30140/SG.200309.0001

摘要

工程上已有採用雙排鋼軌樁無支撐工法進行大面積開挖之案例，但對擋土結構之變形特性仍未有充分之了解。本文簡要介紹雙排鋼軌樁之施工及擋土機制，另以FLAC、RIDO及TORSA三套程式進行參數研究，以探討雙排鋼軌樁之擋土行為。參數研究結果顯示，雙排樁之貫入深度加深、前後排樁之間距加大、增加壁體勁度及帽樑之束制皆有減少壁體變位之效果。文中亦介紹兩個使用雙排鋼軌樁無支撐工法進行開挖之實際案例，其中之一為成功案例，另一則屬失敗案例。於分析設計方法尚未成熟，且施工經驗有限之狀況下，雙排鋼軌樁無支撐工法之設計應做詳盡之參數研究，以減少開挖失敗之機率。

關鍵字

擋土結構 ； 支撐 ； 鋼軌樁 ； 開挖

並列摘要

The self-standing double-rail earth retaining system has been used in several large-scale excavation projects, though its deformation characteristics remain virtually unknown to the design engineers. This paper briefly introduces the construction and possible mechanism of the double-rail system. Three numerical programs, FLAC, RIDO and TORSA, were used to conduct parametric studies on the earth retaining behavior of the double-rail system. It is found that either increasing the penetration depth or widening the row spacing of rails can reduce the overall deformation of the retaining system. Using large size rail and refraining double-rail with rigid cap beam also help in reducing wall deformation. Two case histories, one successful and the other failed, were also presented to further delineate the use of double-rail system. Lacking design and construction experience of the double-rail system, it is advised that detailed parametric studies be carried out to minimize the possibility of excavation failure.

並列關鍵字

earth retaining system ； lateral support ； rail pile ； excavation