研究生: |
鄭文陵 Wen-ling Cheng |
---|---|
論文名稱: |
節理傾角變化對岩坡建物興建引致之裂縫發展探討 Microcrack Development in Regular Jointed Rock Slope under Different Dip Angle due to Building Construction |
指導教授: |
陳志南
Chee-nan Chen |
口試委員: |
彭桓沂
Huan-yi Peng 陳堯中 Yao-chung Chen 林志森 Chih-sen Lin |
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: | 2014 |
畢業學年度: | 102 |
語文別: | 中文 |
論文頁數: | 256 |
中文關鍵詞: | 岩坡 、節理傾角 、退縮距離 、裂縫發展 |
外文關鍵詞: | rock slope, dip angle, recessional distance, microcrack development, PFC2D |
相關次數: | 點閱:197 下載:2 |
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本研究利用PFC2D軟體建立數值模式,於設定之建物基礎寬度(B=30m)與岩坡(坡角θ=45°、坡高H=150m)情況下,考量五種不同退縮距離(0、B/2、B、2B、5B)及八種不同節理傾角(無節理、0°、15°、30°、45°、60°、75°、90°)組合,針對規則節理岩坡之建物興建,就引致坡體內部之裂縫初裂與衍化、坡頂及坡趾之主應力調整進行探討。
分析結果發現,就無節理岩坡之裂縫發展,如採莫爾庫倫破壞準則,是由岩石之剪力強度(c、ϕ)所決定;至於有節理岩坡之裂縫發展,初期主要是沿著節理方向延伸,後期則未必如此。再透過水平地表於無節理情況下之最終裂縫發展範圍分析,可印證與完整岩盤之理論等壓線分佈形狀相似,因此裂縫發展與應力路徑有關。最後彙整提出岩坡承載引致裂縫發展之定性及定量發現,提供工程界參考。
This study is using numerical analysis software PFC2D to simulate microcrack development of rock with one regular set of joint and development of principle stress on hill slopes under building loading. The building near slope on the assumed that the rock slope angle is 45° with slope height 150m. Microcrack initiation and developmental are analyzed under the combination of five different recessional distances (0、B/2、B、2B、5B) and eight different dip angles (no joint、0°、15°、30°、45°、60°、75°、90°) where B=30m is the width of the building. The principal stress adjustment near slope summit and toe are also analyzed.
The analytic results show that the microcrack development is determined by shear strength of the rock on the basis of Mohr-Coulomb criterion if no joint exists in rock slope. However, the microcrack development in jointed rock slope is different. At the beginning stage of the microcrack development is extended along the main jointed, then it spreads. The shape of microcrack fully development of final stage in no jointed flat is similar to isobars in intact rock. The microcrack development is related to the direction of stress path. Finally, qualitative and quantitative conclusions relating microcrack development under loading in rock slope are proposed for engineering reference.
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