冰凍工法於隧道開挖中凍脹有限元素分析; FEM simulation of frost heave with artificial ground freezing in tunnel excavation

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Title:	冰凍工法於隧道開挖中凍脹有限元素分析;FEM simulation of frost heave with artificial ground freezing in tunnel excavation
Authors:	唐大舜;Da-shun Tang
Contributors:	土木工程研究所
Keywords:	有限元素法;分凝勢;水分遷徙;土壤凍脹;地盤冰凍工法;潛盾隧道;tunnel;ground freezing method;frost heave;water migration;finite element method;segregation potential
Date:	2008-06-26
Issue Date:	2009-09-18 17:24:15 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	本論文針對用於輔助潛盾隧道開挖之冰凍工法，考慮土壤冰凍後產生水分遷徙現象造成土壤之凍脹行為；研究中將使用分凝勢、及入流通量兩種凍脹模型進行數值模擬。分析之案例為中國南京San－Zhang隧道與雲林科技大學現地凍土試驗，以有限元素軟體ABAQUS進行數值模擬分析。依照現地狀況建立有限元素數值模型，透過溫度邊界條件的設定，模擬冰凍管的冷凍作用，並根據凍脹模型設定土層之熱學性質參數、凍脹分析相關參數。模擬之結果與現地量測資料比較，以探討模擬之成效；另外分別藉由調整凍結緣溫度、冷凍溫度、及凍土層上部覆土應力，探討各參數之變化對土壤凍脹之影響。 The main objective of this study is to study water migration and frost heave induced by ground freezing method applied to tunnel construction. The segregation potential method and the water inflow content method are used in the numerical simulation. Two cases are simulated, included the San-Zhang subway in Nanjing of China, and the ground freezing test in National Yunlin University of Science and Technology. The numerical analysis is performed by using ABAQUS, and considers temperature boundary conditions, thermal property parameter of soil layer, frost heave model parameter. The applicability of the numerical results is denouemented by comparing with the on-site observation of the field measurement. Further, influence factors such as the strength of freezing and overburden pressure are studied.
Appears in Collections:	[Graduate Institute of Civil Engineering] Electronic Thesis & Dissertation

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