淺論扶壁式連續壁之分析與設計

A Note on the Analysis and Design of Diaphragm Wall with Buttresses

謝旭昇(Hsii-Sheng Hsieh) ； 呂芳熾(Fang-Chih Lu)

《地工技術》 76期 (1999/12) Pp. 39-50

https://doi.org/10.30140/SG.199912.0002

摘要

扶壁式連續壁常應用於深開挖工程中，其目的在控制連續壁體之側向變形量並增加開挖之穩定性。扶壁之設計須考慮土壤及結構之互制行為，其複雜度相當高，並非現有之分析程式所能勝任，因此實務上須將扶壁之行為做適當簡化。考慮現有分析程式之能力，建議將扶壁視為一種特殊形式之地質改良，其效應為提高開挖區土壤之等值勁度及強度參數。連續壁之變形、彎矩及剪力因扶壁之設置而減少，減少幅度則視扶壁之數量、長度及深度而定。扶壁乃以連續壁機具施作，其施作品質影響扶壁行為甚鉅，施工時應特別注意扶壁與主體連續壁交接面之處理，以確保扶壁能發揮其設計功能。

關鍵字

地下室開挖 ； 連續壁 ； 扶壁

並列摘要

Diaphragm wall with buttresses is often used in deep excavation projects to reduce its displacement. The overall stability of excavation is increased as well. The behavior of buttress is a highly complicated one and of soil-structure interaction nature, which can not be easily modeled by commercially available soft wares. As a result, some simplifications have to be adopted in order to analyze and design the buttress. It is suggested that the buttress be regarded as a certain type of soil improvement. The existence of buttress increases the equivalent stiffness and strength parameters of soil within excavation zone. The displacement, moment and shear of the diaphragm wall are reduced as a result, and the amount of reduction is pending on the number, length and depth of the buttress. Buttress is built the same way as the diaphragm wall, and the construction quality has a profound effect on its field behavior. It is noted that the joint between buttress and diaphragm wall has to be carefully constructed to ensure that the buttress behaves as originally conceived.

並列關鍵字

basement excavation ； diaphragm wall ； buttress