研究生: |
陳均維 Jyum-Wei Chen |
---|---|
論文名稱: |
多階加勁邊坡受降雨入滲破壞之試驗與分析研究 Investigation of a Multi-tier Geosynthetic-Reinforced Soil Slope Failure subject to Rainfall Infiltration |
指導教授: |
鄧福宸
Fu-Chen Teng 楊國鑫 Kuo-Hsin Yang |
口試委員: |
賴世屏
林宏達 |
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: | 2017 |
畢業學年度: | 105 |
語文別: | 中文 |
論文頁數: | 172 |
中文關鍵詞: | 低滲透性土壤 、加勁擋土邊坡 、不飽和土壤 、滲流與應力耦合分析 、邊坡破壞 |
外文關鍵詞: | Marginal backfill, GRS structure, unsaturated soil, hydro-mechanical coupling analysis, slope failure |
相關次數: | 點閱:587 下載:15 |
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本文探討一以低滲透性土壤為回填土,而加勁材則使用加勁格網之多階加勁擋土邊坡,受降雨入滲作用後之破壞案例分析。此邊坡高為26公尺,共4階,而跟一般設計規範所要求的不同,此加勁邊坡之回填土屬於細粒料含量超過60%的砂質粉土質黏土(CL-ML)。此種土壤因滲透性較低,且其坡背之風化岩層為不穩定之狀態,故受降雨影響後孔隙水壓累積,其剪力強度亦會因土壤含水量增加而有明顯降低的現象。此加勁邊坡在2010-2012年間受颱風豪雨的影響產生持續性的變形。在2012年六月到十二月間,此牆的坡頂沉陷累積達到140公分,雖然後續相關單位已採取補強措施,在2013年八月因兩個颱風接踵而至,導致此加勁邊坡發生崩塌破壞。本研究進行一系列的土壤力學試驗,除了求取該回填土之土壤基本物理性質、土壤礦物成分與工程性質外,亦對其不飽和土壤水分特性參數進行求取,並使用有限元素法進行滲流與應力耦合分析加以釐清此加勁擋土牆的破壞機制。透過此案例分析,本文也詳細討論以低滲透性土壤為回填土之加勁擋土邊坡,受颱風降雨作用下,在設計與施工上的相關重要考量。
This paper presents a failure case investigation of a multi-tier geosynthetic-reinforced soil slope with marginal backfill subjects to rainfall infiltration. The considered slope is 26 m high, 4 tier geogrid-reinforced structure constructed for traffic demands in mountain area in Taichung, Taiwan. Contrary to the backfill recommendations in design guidelines, low permeability sandy silt (CL-ML) with over 60% of fines was used as backfill in the reinforced zone. The shear strength of this kind of soil would decrease according to the increasing pore water pressure triggered by the low permeability. This GRS structure first experienced excessive deformation after seasons of typhoon and heavy rainfall from 2010-2012, and the measured settlement at wall crest were 140 cm from June to December 2012. Although an immediate remediation had been conducted for the excessive deformation, the slope finally collapsed caused by two sequential typhoon events in August 2013. A series of soil mechanic laboratory test will be used in this study, including mineral components, physical and engineering properties of the soil. However, not only those properties mentioned above will be done, but also unsaturated one, such like pressure plate test to determine soil-water characteristic curve (SWCC). After soil laboratory tests have been done, a numerical finite element study using hydro-mechanical coupling analysis will be used to investigate the failure mechanisms of this GRS structure. According to the analysis, this study will propose design and construction implication for GRS structures with marginal backfill subject to heavy rainfall.
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