臺灣博碩士論文加值系統

本研究之主要目的在於探討深開挖工程中各開挖階段其壁體變形依時
性（Time-dependent）之問題，亦即在深開挖工程中，各開挖階段在其靜
置時間中，壁體變形隨時間增加而增加，其發生原因可能為土壤之壓密或
潛變，本研究只針對壓密加以探討?本研究理論基礎為結合Mohr-Coulomb
模式、修正Cam-Clay模式和 Biot 壓密理論，運用有限元素法分析在平面
應變行為下，探討壁體變形隨時間變化之情形。分析結果顯示在設計分析
深開挖工程時，若工程採用逆打工法施工時，則適度的將施工靜置時間考
慮在內，可獲得更合理的分析成果，反之順打工法則較無顯著影響。

The objective of this study is to investigate the time-dependent
behavior of wall deflection induced by deep exvavations.Based on
field observations,it is found that amount of wall deflection is
normally increased with elspsed time for each stage of
excavation.Both consolidation and creep may contribute such
behavior.In this study Modified Cam-clay elasto-plastic model
combined with Biot consolidation theory is used for cohesive
soil, and Mohr-Coulomb model is used for cohesionless soil.
Analysis results exhibit that computed porewater pressure and
wall deflections are close to field observations in engineering
pratice,compared with field observations.Consolidation may
contribute little on the time-dependent behavior of wall
deflection.