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題 名 | 地中壁與扶壁設置之效益探析=Efficiency of Installation with Cross Walls and Buttress Walls in Deep Excavation |
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作 者 | 何政道; 陳水龍; 葉家佑; | 書刊名 | 地工技術 |
卷 期 | 140 2014.06[民103.06] |
頁 次 | 頁69-78 |
專 輯 | 都會區工程開挖案例 |
分類號 | 441.13 |
關鍵詞 | 開挖; 扶壁; 地中壁; 變位折減率; 三向度有限元素法; Excavation; Cross walls; Buttresses; DRR; Three-dimensional FE analysis; |
語 文 | 中文(Chinese) |
中文摘要 | 在軟弱地層之深開挖工程,地中壁及扶壁經常被用來減少擋土壁體之側向變形量,目前已累積許多成功案例,顯示地中壁/扶壁的設置,對於抑制連續壁側向變位及開挖之穩定性皆有所貢獻。地中壁/扶壁之行為實際上屬於複雜之三向度問題,惟目前工程實務上,常簡化使用二向度之方式來分析,並無法有效模擬地中壁/扶壁與土壤之互制行為。本研究為了瞭解地中壁/扶壁間距對連續壁側向變位的影響,採用位於台北市深開挖16m之工程案例。以三向度有限元素法進行模擬,分析結果顯示與現場觀測資料頗為吻合,後續採用該模型進行一系列的研究。分析結果顯示,地中壁抑制連續壁側向變形之效果比扶壁好。本研究案例之扶壁變位折減率(DRR)約可達到50% (SBW/He=0.375),地中壁變位折減率約可達到77.5% (SCW/He=0.55)。 |
英文摘要 | Cross walls and buttress walls have been widely adopted, with many successful cases, in soft ground excavation work. The field instrumented displacement data indicated that cross walls and buttress walls could effectively reduce the lateral displacement of diaphragm wall and thus enhance the stability of the excavation work. The interaction between the soil/cross/buttress- and diaphragm walls is a three dimensional problem but in practice, due to the complexity of three-dimensional analysis, the problem is commonly simplified into a two-dimensional problem. This study aimed at examining the influence of the space of the cross/buttress walls on the displacement of diaphragm wall via a series of three-dimensional FE analysis. The numerical procedure was first calibrated against the field data obtained from a 16m deep excavation real case in Taipei city. The FEM simulated results were consistent with the field monitored data. The basic model was then used in the subsequent parametric study to evaluate the efficiency of buttress walls and cross walls in deep dxcavation. It was found that the cross walls were more efficient than the internal buttress walls on reducing the displacement of the diaphragm wall. These results were evaluated and compared through the so-called displacement reduction ratio (DRR). The results indicated that the DRR of buttress walls and cross walls were 50% (for SBW/He=0.375) and 77.5% (for SCW/He=0.55), respectively. |
本系統中英文摘要資訊取自各篇刊載內容。