承受橫向力之群樁分析

Analysis of Laterally Loaded Group Piles

范嘉程(Chia-Cheng Fan)

《地工技術》 66期 (1998/04) Pp. 85-96

https://doi.org/10.30140/SG.199804.0008

摘要

當群樁之樁距窄小時，承受橫向力之樁群行為受各樁間之互制作用影響極大，此一互制作用可稱為樁－土壤－樁互制（Pile-soil-pile Interaction）或群樁效應（Group Effect）。影響承受橫向力之群樁行為的主要因素為樁材料性質、土壤行為、樁間距及載重方向，其中樁間距及載重方向為控制群樁效應的重要因素。根據前人研究指出，沿橫向載重方向6至8倍樁徑或垂直於載重方向4至5倍樁徑時，群樁效應可不予考慮，樁群中各樁之行為可以單樁來考慮。本文將探討“樁－土壤－樁”互制對承受橫向力群樁行為的影響，除對現有分析方法作一討論外，同時亦介紹一目前最新發展之橫向力群樁分析方法，以提供大地工程師作為分析承受橫向力之群樁的變形及應力行為的參考。

關鍵字

橫向力 ； 群樁 ； 樁－土壤－樁互制效應 ； p-y曲線

並列摘要

The laterally loaded behavior of a group pile is affected greatly by the interaction between piles while pile spacing is close. The interaction is termed as pile-soil-pile interaction or group effect. Pile properties, soil behavior, pile spacing, and loading direction are main factors affecting the behavior of a laterally loaded group pile; among which, pile spacing and loading direction are important factors controlling pile-soil-pile interaction. According to previous studies, group effect is insignificant while pile spacing is six to eight times pile diameter along the lateral loading direction or is four to five times pile diameter normal to the loading direction; the lateral behavior of a group pile can be modeled as that of a single pile. This article focuses mainly on discussion of the effect of pile-to-pile interaction on behavior of laterally loaded pile groups. Existing methods for analyzing laterally loaded pile groups are described. In addition, a recently developed concept and methodology for analyzing a laterally loaded pile group is introduced to provide geotechnical engineers with a way to reasonably calculate the stress and deflection of laterally loaded group piles.

並列關鍵字

Lateral Loads ； Group Piles ； Pile-soil-pile Interaction ； p-y Curves