| 姓名 | 陳耀東(Yao-Tung Chen) | 電子郵件信箱 | s220684775@yahoo.com.tw | |
| 畢業系所 | 營建工程系碩士班(Department and Graduate Institute of Constrction Engineering) | |||
| 畢業學位 | 碩士(Master) | 畢業時期 | 94學年第2學期 | |
| 論文名稱(中) | 對數螺旋形滑動模式之邊坡穩定分析程式 | |||
| 論文名稱(英) | A Numerical Program of the Logarithmic Spiral Sliding Model for Slope Stability Analyses | |||
| 檔案 |
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論文使用權限 | 校內外完全公開 | |
| 論文語文/頁數 | 中文/98 | |||
| 摘要(中) | 本文採用對數螺旋形滑動模式，並且利用雙螺心曲線來克服互層土壤之不同內摩擦角，使用微軟公司所發展的EXCEL
VBA(Visual Basic for
Application)作為程式設計語言，探討不同條件下土壤邊坡穩定之安全係數及臨界滑動面。邊坡土壤材料可分為�痋Bc和c-�痐坐g壤，同時考慮均質及互層土壤兩種條件之邊坡進行穩定性分析，並利用STABL程式分析結果來驗證本研究之正確性。 由分析的結果顯示，不論是均質或層狀土壤邊坡， 本研究自行發展的程式分析所得之結果與STABL程式分析的結果相近。非凝聚性均質邊坡皆屬於淺層破壞，只有具有c-�痐g壤邊坡破壞模式由剪力因子(λ=γHtan/c)所控制。互層邊坡的分析結果顯示，不論是何種土壤邊坡，其滑動面皆是由剪力強度軟弱的土層控制，但下層土壤較軟弱時，其破壞模式有所不同。 由不同坡角β與剪力因子λ分析可得坡底圓與坡趾圓的分界線，當剪力因子λ=0且坡角大於53°時，皆屬於坡趾圓破壞；當坡角β愈小，要產生臨界坡趾圓所需的剪力因子λ值愈大。當剪力因子λ=0時，產生淺層坡趾圓的坡角β須大於60°。當剪力因子λ固定時，安全係數Fs與摩擦角和凝聚力之關係呈現線性。 最後，本文建立不同剪力因子λ和坡角β下的臨界滑動圓心與半徑圖表，並建立坡角β與臨界穩定數N 和N 之關係圖，供使用者參考。 | |||
| 摘要(英) | To investigate the
mechanism of slope stability, this study quoted the theorem of
logarithmic spiral mode, utilized the double spiral curves to overcome
the double-layer slope with different friction angle. A numerical
program developed by VBA language was then established to analysis the
stability of soil slopes. The research especially focuses on the safety
factor and the critical slide circle. The materials of slopes were
divided into three types in this study, a cohesionless soil, a cohesion
soil, and a soil with both cohesion and friction angle. Moreover, a
homogenous soil slope and a double-layer slope are concerned as well. To
verify the applicability of the developed program VBA, analyzed results
by the program are compared with those by STABL program. It was found, the results analyzed by developed program are close to those calculated by STABL program. The failure circle of a homogenous slope with cohesionless soil belongs to a shallow failure slope. However, the failure type of a homogenous slope with both cohesion and friction angle depends on the shear strength factor . No matter with any soil type, when slopes with double layers, the type of failure circles are govern by the weaker layer. It develops different failure mode, if a slope which the bottom layer is weaker than the upper layer. A borderline between toe circles and base circles was established based on the shear strength factor and the slope angle 。When the shear strength factor =0 and a slope angle greater than 53o ， the toe circle can be found. If the slope ratio increases, a toe circle will occur only if the shear strength factor increases. Moreover, if the equals to 0, a shallow toe circle can be found only if the is greater than 60o. When is a constant, a linear relation was found between safety factor FS and shear strength parameters (c, ). Finally, this study provides a series of figures, including the positions of slide circles and safety factor for soil slopes, based on the results of numerical analyses. | |||
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