土釘結構之理論探討及案例分析

Theory and Application of Soil Nailing

趙紹錚(Sao-Jeng Chao) ； 周南山(Nan-Shan Chou) ； 楊麗敏(Lih-Min Yang)

《宜蘭大學學報》 2期 (2004/03) Pp. 81-95

https://doi.org/10.6178/niu.2004.02.18

摘要

土壤缺乏抗張強度而為不良之結構材料，而鋼筋或鋼棒則具有極佳之抗張強度。土釘工法之基本概念為在現有邊坡或深開挖面之土壤中，利用鋼筋或鋼棒將此土壤予以加勁之。由於土釘工法施工簡易且成本低廉，目前於國內邊坡穩定工程之使用日漸增加，然而國內之施工規模與實績，可謂已超越理論分析工作之進展，特別是土釘結構與土壤間之互制關係，仍有諸多尚需研究瞭解之部分。土釘結構多採用極限平衡法進行分析計算，極限平衡法係考慮極限破壞時之安全係數，作為設計之控制要素。為能對土釘結構之行為表現，有更深入之瞭解，本文利用有限元素法，對土釘材料及土壤分別加以模擬。本文詳細說明國立暨南國際大學之土釘工法邊坡整治案例分析，以增加對土釘結構設計之瞭解及掌握，並可用為後續土釘結構設計之參考。

關鍵字

土釘 ； 有限元素法 ； 邊坡穩定 ； 極限平衡法 ； 安全係數

並列摘要

Soil is a poor structural material because it is weak in tension, while steel is strong in tension. The fundamental concept of soil nailing is that soil mass can be effectively reinforced by installing grouted steel bars into it. Since the soil nailing technique is a low cost, time saving, and straightforward construction, it has been used more frequently for the purpose of slope stabilization in our country. However, the field construction is rather ahead of the development of the theoretical analysis, i.e., the soil nailing structure, which is relatively complicated in considering of the soil-structure interaction, needs more advanced study to understand its mechanical behavior. Soil nailing structures are usually analyzed using the limit equilibrium method, which takes the factor of safety at failure into account during the design procedure. In order to have more understanding on the mechanical behavior of the soil nailing structures, this study employs the finite element method to simulate the nails and the soil. This paper explains the analysis procedure of soil nailing design for the National GhiNan University, which provides more understanding on the behavior of soil nailing structures and can be used as reference for designing works.

並列關鍵字

Soil nailing ； Finite element method ； Slope stability ； Limit equilibrium method ； Factor of safety