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研究生:賴羿帆
研究生(外文):Yi-Fan Lai
論文名稱:植生配置對邊坡穩定性影響分析
論文名稱(外文):Influence of Configuration of Vegetation on the Stability of Slopes
指導教授:范嘉程范嘉程引用關係
指導教授(外文):Chia-Cheng Fan
學位類別:碩士
校院名稱:國立高雄第一科技大學
系所名稱:營建工程研究所
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:2011
畢業學年度:99
語文別:中文
論文頁數:108
中文關鍵詞:植生配置、拱效應、穩定性增益
外文關鍵詞:Vegetation configurationarching effectstable gain
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植生是大自然穩定邊坡的重要方法之ㄧ,因此,植生對崩塌地裸露邊坡的整治與復育穩定分析,遂成為邊坡穩定的重要課題,然而,植生在何種配置方式下,才能達到對邊坡抵抗淺層破壞最大效益,本研究利用PLAXIS 3D程式進行數值模擬分析,根系型態為垂直深根型(tap root systems),並分別配置於上、中、下邊坡等處,來探討降雨時,對邊坡造成之位移、力學機制,並分析配置於不同位置時,對邊坡穩定性影響。

分析結果得知,植生的存在能增加邊坡整體之穩定性,相鄰根系之間的坡面表土會受到根系之侷限或束制,進而形成土拱,此土拱能減弱土壤之位移量,當根系間距越近,拱效應越能發揮擋土的作用,反之,當根系間距越寬,其植物對於邊坡安全性所能增加的影響就越有限,當植物間距大於6m後,安全係數增加量逐漸趨於定值,相互之間安全係數差異值不到2%。植物重量對於邊坡穩定性有所影響,當植物配置於潛在破壞面上方時,植物重量會造成下滑力的增加,相對的造成安全係數減低,而配置於潛在破壞面下方時,樹的載重則提供了「壓腳」的功能,間接的增加坡面穩定性。邊坡在整體造林狀態下,比起單獨於上、中、下坡造林者更能提供抑制邊坡土壤滑動的能力,與無根系邊坡狀態相比,單排植生安全係數最多能提升20%,而造林狀態安全係數則提升了68.5%。
As one of the nature’s most important methods in maintaining slope stability, vegetation in bare slopes as a result of landslide and recovery stability analysis have become important issues in maintaining slope stability. However, one must find out which kind of vegetation configuration is most effective in the defense against shallow slope failure. In this study, PLAXIS 3D was used for numerical simulation with tap root systems individually placed on upper, mid and lower slope in the investigation of impacts brought by the rainfall on slope displacement and mechanical mechanisms; in addition, the effects of different vegetation configurations on slope stability were also analyzed by this study.

From the analysis, the presence of vegetation can increase overall slope stability with slope surface soil of the neighboring root systems bounded or restricted by the root system before an arch is formed to weaken of soil displacement. As the arch’s retaining effect increased, the distance between the root systems shortened while as the distance between root system increased, the effects of vegetation on slope safety were limited. As the distance between vegetation reached over 6m, the degree of increase in safety factor also gradually settled at a fixed value with less than 2% safety factor difference shown between the vegetations. The tree weight has slight effect on the safety factor of the vegetated slope. When vegetation was placed on top of potential failure, its weight enhanced slope sliding power, resulting in the decrease of safety factor whereas when the vegetation was placed below potential failure, the weight of the trees served as a foundation weight and indirectly increased slope stability. Slope can provide better slope sliding control in overall forestation than upper, mid, and lower slope forestation alone. Compared to slopes without root systems, safety factor in single-row vegetation can only reach up to 20% maximum whereas a 68.5% increase in safety factor was seen in overall forestation.
摘要 i
英文摘要
誌謝
目錄
表目錄
圖目錄
一、緒論
1.1 研究動機
1.2 研究目的與內容 1
二、文獻回顧
2.1 根系力學之發展
2.2根系提供土壤剪力強度之理論
2.2.1 植物根系加勁土壤剪力強度增量公式
2.2.2垂直根系剪力帶之根力模式-以根系抗拉拔力為主
2.2.3 垂直根系剪力帶之根力模式-根系與土壤間靜摩擦力觀點
2.2.4 傾斜根系剪力帶之根力模式-以根系抗拉拔力為主
2.2.5 傾斜根系剪力帶之根力模式-根系與土壤間靜摩擦力觀點
2.3 數值模擬研究根系邊坡穩定分析
2.3.1 河岸樹木對維持河岸穩定性分析
2.3.2 林木根系固土力學機制
2.3.3生態工法在河溪岸坡穩定之應用與分析
2.3.4 三維數值模擬和分析影響森林結構對山邊坡穩定性
2.4離散樁對邊坡穩定效益影響
三、研究方法與設計
3.1 Plaxis 3D 介紹
3.2淺層破壞邊坡配置植物根系穩定分析
3.2.1邊坡及根系設定及模型設計
3.2.2土壤及根系參數
3.2.3根系配置對邊坡穩定增益分析
四、植根對邊坡穩定性影響
4.1 無根邊坡與造林邊坡穩定性差異
4.1.1無根邊坡位移機制
4.1.2根系位移機制
4.1.3造林邊坡與無根邊坡穩定性差異
4.1.4交叉造林邊坡與無根邊坡穩定性差異
4.2 根系配置位置對穩定性影響
4.2.1上坡配置根系位移機制比較
4.2.2 邊坡中央配置根系位移機制比較
4.2.3 下邊坡配置根系位移機制比較
4.3 根系配置對邊坡安全穩定性影響
4.3.1 植物配置安全係數
4.3.2 不考慮植物重量情況植生安全穩定性
伍、結論與建議
5.1結論
5.2建議
參考文獻
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[39] PLAXIS說明手冊
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