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題 名 | 連續壁槽溝破壞行為之模型試驗研究=A Model Test on Failure of Slurry Trench |
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作 者 | 蔡錦松; 楊振福; 徐聰榮; | 書刊名 | 中國土木水利工程學刊 |
卷 期 | 9:2 1997.06[民86.06] |
頁 次 | 頁211-218 |
分類號 | 441.1 |
關鍵詞 | 穩定液; 拱效應; 模型試驗; Slurry; Arching effect; Model test; |
語 文 | 中文(Chinese) |
中文摘要 | 本文以標準砂為材材,藉由模型箱試驗,觀察砂性土層內連續壁槽溝在穩定液急 澽流失過程中發生之破壞現象。觀察結果顯示:(1) 若採用比重為 1.07 之穩定液,當液面 洩降至與地下水位面略等高時,地表即出現明顯的塌陷。(2) 槽溝崩毀所造成之地表沈陷影 響範圍約略與槽溝探度相等。(3) 槽溝破壞型式較相似於弧面土楔破壞模式。(4) 導牆貫入 深度對地表塌陷的形成有影響;對疏鬆砂 (Dr=30%) 及中等緊密砂 (Dr=53%) 而言,導牆貫 入深度與槽溝深度比值分別達 0.18 及 0.15 時,即使槽溝崩落破壞,地表不會塌陷。結論 指出,槽溝穩定性不單與外力情況以及土壤強度有關,導牆所形成之土拱效應亦是主要因素 。 |
英文摘要 | This paper presents a study on the stability of slurry trench. The Mod el tests are performed using a model container with Ottawa sand. The test results are summarized as: (1) if a polymer-base slurry with specific gravity 1.07 is adopted, cave-in of the ground surface would oc-cur once the slurry level is about the ground wated level; (2) ground subsidence induced by the cave-in is within a range about the same as the depth of the trench; (3) an arc surface model can be used to describe the sliding wedge at trench failure; and (4) the penetration depth of the guide wall governs the occurrence of cave-in, for instance, for a loose sand case (Dr=30%), a ratio of the guide wall depth to the trench depth is greater than 0.8, no cave-in appears on the ground surface when the trench wall collapses. For a medium dense sand case (Dr=53%),the ratio is about 0.15 for a no cave-in result. It may be concluded that stability of slu rry trench is not only governed by external loading condi-tion and the soil stre ngth, but also the arching effect due to guide wall installation. |
本系統中英文摘要資訊取自各篇刊載內容。