英文篇名
DESIGN OF DIAPHRAGM WALL AS RETAINING STRUCTURE FOR DEEP EXCAVATION: MODELS AND GUIDELINES
作者
歐晉德、石強、謝旭昇
摘要
在深開挖工程中以連續壁作為擋土結構時,必須獲知其在施工過程中所受之應力狀態,壁體可能承受之彎矩及剪力,方能完成結構設計。由於連續壁所受應力來自於開挖後壁體兩側之不平衡壓力狀態所產生者,而此不平衡壓力大小受壁體之剛性度及土體側位移之影響,且在施工過程中始終處於變異狀態,因此,在設計之過程中,對於如何正確估計並模擬側壓力之變化,以掌握土體與連續壁結構互制行為下之壁體應力狀態,常為決定設計成果,乃至整個工程成敗之首要因素。鑒於目前之設計理論仍在發展且尚未統一,而國內連續壁之使用正隨著地下工程之普遍和開挖深度之增加,有方興未艾和日漸重要之趨勢,為求我國工程界有進一步之發展,本文乃就現有之設計模式及設計應考慮事項作一整理,以供參考。
英文摘要
A commonly used method is to treat the wall as a beam subjected to loadings induced by excavation. Bending moment and shear stress acting on the diaphragm wall are solved as a structural problem and structural details are designed accordingly. Finite element method is another promising method for diaphragm wall design. Its application provides relevant information for diaphragm wall design, and gives an overall picture of what would happen during excavation. Experience has shown that both methods can produce satisfactory results provided that appropriate parameters are chosen. Other design considerations, such as allowable displacement, watertightness, etc., are also mentioned.