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題 名 | 卵礫石層因開挖引致之拱效應=Arching Effect within Cobbles Due to Underground Excavation |
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作 者 | 楊長義; 陳建仲; | 書刊名 | 中國土木水利工程學刊 |
卷 期 | 9:3 1997.09[民86.09] |
頁 次 | 頁369-378 |
分類號 | 441.13 |
關鍵詞 | 卵礫石層; 拱效應; 碎屑性力學; 節塊拱原理; Cobble formation; Arching effect; Clastic mechanics; Voussoir arch principle; |
語 文 | 中文(Chinese) |
中文摘要 | 本文利用碎屑性顆粒力學方法考慮卵礫石間之幾何接觸關係,依其相對排列型態,將層狀 沈積排列之卵礫石力量傳遞行為模擬成各種重疊度不等的層狀規則塊體系統,並以塊體重疊比例評 估拱作用因子,據以分析各類卵礫石於開挖後形成拱效應之定性上特徵,並經DDA程式之定性模 擬比較。初步研究結果顯示:(1)卵礫石重疊程度愈對稱或形狀愈近似圓形者,拱作用效應愈明顯, 較易形成角型隱藏拱現象。(2)在DDA分析結果顯示:重疊1/ 2之對稱塊體系統內最大主應力的 傳遞方向較為連續,拱作用型式之傳遞力現象最明顯。 |
英文摘要 | This paper proposes an approach to evaluate the arching effect of cobble formation under excavation. The cobble formation is regarded as a regular blocky system and the overlap ratio of packing blocks is defined as an arching factor. The approach has been verified by DDA simulation. The study reveals that (1) the symmetric packing system of cobble ellipsoids shows a remarkable arching effect and the pointed arch type is dominant and (2) the compression stress transmission showing the arch action is more continuous in symmetric packing cobbles. |
本系統中英文摘要資訊取自各篇刊載內容。