研究生: |
黃世倫 Shih-Lun Huang |
---|---|
論文名稱: |
臺北捷運深開挖案例之有限土體效應探討與分析 Case Study of Deep Excavation of Taipei MRT under Limited Soil Space Condition |
指導教授: |
林宏達
Horn-Da Lin |
口試委員: |
歐章煜
Chang-Yu Ou 王建智 Chien-Chih Wang 呂芳熾 Fang-Chih Lu |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 營建工程系 Department of Civil and Construction Engineering |
論文出版年: | 2015 |
畢業學年度: | 103 |
語文別: | 中文 |
論文頁數: | 139 |
中文關鍵詞: | 台北捷運 、深開挖 、鄰近地下結構物 、有限土體 、擋土壁體變位及地表沉陷 、監測數據 、數值分析 、土壤硬化模式(HS- model) |
外文關鍵詞: | Taipei MRT, deep excavation, adjacent structure, limited soil space, wall displacements and ground settlements, field measurements, numerical analyses, Hardening Soil model (HS-model) |
相關次數: | 點閱:403 下載:15 |
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本研究以實際捷運深開挖案例探討擋土壁與鄰近地下結構物間之有限土體效應。先蒐集案例相關資料與彙整工區監測資料,接著探討主體開挖區壁中傾度管監測數據與地表沉陷之合理性,然後再以此案例之監測結果探討有限土體影響因子與壁體變位關係。本研究也根據案例探討之心得選出分析斷面以進行更深入之數值分析。數值分析採用PLAXIS-2D及土壤硬化模式(HS- model)。先以自由場情形下擋土壁體變位及地表沉陷監測結果來決定合理之土壤模式參數,再進一步分析探討深開挖與鄰近地下結構物之有限土體效應。
經由實際案例探討,證實有限土體效應存在且會受到鄰近地下結構物至連續壁之距離(L)、鄰近地下結構物之深度(Ha)及工區開挖深度(He)等因子影響,致使連續壁與地下結構物間側向土壓力變小,而壁體變形量也會變少。以案例工區之自由場數值分析結果來探討兩種推求參數方式之結果顯示,採用“工址試驗結果”求得之土層勁度參數較符合擋土壁側向變形量之實際監測結果。考量鄰近地下結構物之有限土體效應分析結果顯示,壁體變位之分析結果與實際傾度管監測結果相符且較自由場之壁體變位小。這個結果說明既有地下結構物基礎有足夠深度時,確可阻礙破壞面發展到地表面,而呈現出有限土體效應。
This is a case study of deep excavation of Taipei MRT on the effects of limited soil space condition. First, the engineering information of the studied case and the field measurements are collected and summarized. The reasonability of the measured wall displacements and ground settlements are examined. Then, the effects and affecting factors of the limited soil space on the wall displacement are studied. As a result of the case study, several cross sections are selected for further numerical analyses. The numerical analyses adopt Plaxis-2D and Hardening Soil model (HS-model). First, the monitoring results of retaining wall displacements and ground settlements are used to determine reasonable soil model parameters under unlimited soil space. Then, further analyses are conducted to study the responses of the deep excavation and the adjacent structure of the limited soil space condition.
Bases on the case study, the limited soil space effects exist and are affected by the distance from adjacent underground structure to diaphragm wall (L), the depth of adjacent underground structure (Ha), the depth of excavation (He), etc. The limited soil space condition results in an decrease in lateral earth pressure acting on the diaphragm wall and less wall displacement. Numerical analysis results of the greenfield condition show that soil stiffness parameters determined using“field and laboratory test results of the studied case” are more in line with measured retaining wall displacements. Analytical results of the limited soil space condition that consider the adjacent underground structure show that the wall displacement results agree with the field measurements and smaller than the unlimited soil space condition. The results indicate that when the existing underground structure is deep enough it will hinder the development of the potential failure surface up to the ground surface such that the effects of limited soil space warrant consideration.
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