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題名 | 山黃麻根系對土/根系統剪力強度之提升效果研究=The Effect of Indiacharcial Trema Root on the Shear Strength Increment of Soil/Root System |
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作者 | 林德貴; 黃伯舜; 王勝賢; | 書刊名 | 水土保持學報 |
卷期 | 42:4 2010.12[民99.12] |
頁次 | 頁409-422 |
分類號 | 442.3 |
關鍵詞 | 土/根系統; 拉拔抗力試驗; 數值模型; 抗剪強度增量; 力學轉換模式; Soil/root system; Test of pull-out resistance; Numerical model; Shear strength increment; Mechanical conversion model; |
語文 | 中文(Chinese) |
中文摘要 | 依據山黃麻現地調查之根系結構,再利用數值工具可建構山黃麻土/根系統之二維數值模 型,並進行現地土/根系統拉拔抗力試驗之數值模擬。藉由比對土/根系統拉拔抗力試驗之拉拔 抗力~拔出量關係曲線(即P~Lp 曲線)及極限拉拔抗力值Pu 後,得知數值模擬結果與實際量測成 果之吻合度相當良好。隨之,再採用與拉拔抗力試驗相同之土/根系統數值模型,進行直接剪 力試驗之數值模擬,並推估土/根系統之抗剪強度增量值ΔSr。最後,採用Pu 與ΔSr 之數值模擬 成果,即可建置土/根系統極限拉拔抗力Pu 與相應之土/根系統抗剪強度增量ΔSr 之力學關係 式,即ΔSr=f(Pu)關係函數。此關係函數,在植生邊坡穩定性量化分析上提供了一套方便之土/ 根系統力學轉換模式,其將土/根系統之拉拔抗力試驗成果直接轉換為抗剪強度增量。此抗剪 強度增量可直接運用於植生邊坡之二維穩定性分析上。同時,在未來吾人針對不同植生植物土 /根系統之既有大量現地拉拔抗力試驗資料庫,來建置其個別之ΔSr=f(Pu)關係函數時,本研究 所提之建置作業程序,將可作為一相當實用之參考範例。 |
英文摘要 | In this study, two dimensional (2-D) finite element numerical simulations were carried out on the pull-out resistance and the shear strength of soil/root system of Indiacharcial trema. Based on the field investigations of Indiacharcial trema root morphology, one can establish a 2-D numerical model of soil/root system to simulate the pull-out test at field site. It was indicated the simulated pull-outresistance versus pull-out displacement curve (or P~Lp curve) and the ultimate pull-out resistance Pu are in good agreement with those from measurement. Subsequently, a 2-D numerical model of soil/root system identical with the pull-out test was repeatedly used for the simulation of direct shear test to estimate the shear strength increment ΔSr resulted from root system.Eventually, using the numerical results of Pu and ΔSr values, a mechanical relationship between Pu and ΔSr (orΔSr=f(Pu) function) for soil/root system are proposed. The relationship offers the stability analysis of vegetated slope a convenient mechanical conversion model which enables a direct transformation of pull-out resistance into shear strength increment of root system and an immediate application to 2-D slope stability analysis. As a result, to establish an individual ΔSr=f(Pu) function for various plant roots using the large quantity of existing data bank from in-situ pull-out test in near future, it is suggested to regard the proposed working procedures as a practical and useful reference example. |
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