臺灣博碩士論文加值系統

(44.192.94.177) 您好！臺灣時間：2024/07/21 18:36

:::

詳目顯示

:

• 被引用:5
• 點閱:139
• 評分:
• 下載:0
• 書目收藏:0
 自然界中之岩體即使其強度極高或非常緻密，均會有細微裂縫存在於其中 ，而當外在應力作用下，岩體即會因裂縫周圍應力集中而造成破壞。因此 欲瞭解岩體之強度時，對於岩體中裂縫之破裂機制，有其探討之必要。本 研究即分成物理模型試驗及理論分析兩方面，就岩體中含非連續裂縫之破 裂機制進行研究。首先本文以石膏為岩石模擬材料，製作尺寸為30cm×30 cm×5cm 且含各型裂縫之試體，進行一系列之單軸壓縮試驗，透過各種不 同配置之預製裂縫安排，可觀察裂縫發生破裂之變化關係，其次再對於裂 縫周圍進行應力分佈之理論分析，進而可探討裂縫發生破裂之機制。研究 結果顯示：(1) 裂縫之初始破裂型態多以張裂型式出現；(2) 裂縫之尺寸 對初始張裂強度有影響，即存在規模效應問題；(3) 當裂縫分佈在一同線 上時，裂縫破裂機制隨岩橋長度之不同，可分成 TSL、TLS及LTS三種不同 破壞模式；(4) 從本文訂定之材料性質特性曲線配合Griffith強度理論中 之橢圓裂縫邊緣之切線應力公式，可以估算裂縫臨界初始張力破裂之發生 強度；(5) 若引伸至模擬節理面之張裂機制分析，透過材料特性曲線求取 等效裂縫形狀，及應用橢圓裂縫邊緣之切線應力公式，可求得節理面發生 初始張裂之強度曲線；(6) 此一初始張裂強度曲線若與Jae- ger 滑動強 度曲線相配合，則可得知節理面發生初始張裂、滑動或兩者混合發生等破 裂模式判斷準則。
 Rocks, in nature, all have subtle cracks even though they have high strength. Under an ousideload, rocks will have fail- ure due to the concentration of stresses around cracks. There- fore, thefracture mechanism of cracks in rocks is an essential issue to realize the strength of rocks. This research is di- vided into two aspects:physical model experiment and theore- tical analysis to explore the fractures mechanism of colinear- crack rocks. In this research,plaster was selected as the material pre- senting rocks. Samples were made in the size of 30cmx30cmx5cm and contained various cracks, then a serious of uniaxial load tests were processed. Through arranging the compound types of pre-made cracks, the conditions of fracture of cracks can be observed. In addition, the theoretical analysis of stresses distribution of under loading cracks could verify the fracture mechanism of the cracks. Following are the research-results. (1) The initial fracture of cracks, almost, appeared in form of size of cracks affected the initial tension- crack strength that was the problem of existent scale effects. (3) When the cracks were distributed in a line, the fracture mechanism of cracks with the differences of rock bridge length was classified in three failure modes: TSL, TLS, and LTS. (4) Through the material-characteristic curve which is defined in this paper and the formula of Grif- fith's stress distribution theory, the strength of initial tension fracture could be obtained. (5) Applying this result to the analysis of tensile fracture mechanism of joints plane, the equal-effect shape of ellipse cracks could be obtained through the material- characteristic curve, and the initial tension strength of joint could be obtained through the formula of stress distribution theory. (6) By coordinating the initial tension strength curve with Jaeger's sliding strength curve, the judgemental rule for fracture modes,such as the initial tension fracture,sliding and mixing type,could be realized.
 國圖紙本論文
 推文當script無法執行時可按︰推文 網路書籤當script無法執行時可按︰網路書籤 推薦當script無法執行時可按︰推薦 評分當script無法執行時可按︰評分 引用網址當script無法執行時可按︰引用網址 轉寄當script無法執行時可按︰轉寄

 1 含泥岩石節理面力學行為之研究 2 模擬岩石裂隙延伸行為之初探 3 奈米結構對輕薄化之矽晶片表面缺陷造成應力集中現象之影響

 無相關期刊

 1 岩石節理面滯動剪力行為理論模式之研究 2 岩體變形行為規模效應之指標 3 岩石篩理面滯動剪力行為理論模式之研究 4 高嶺土泥漿壓密之研究 5 高速公路鋪面服務能力指標構建之研究 6 道路評審儀之動態回饋分析與研究 7 國際糙度指標與梅氏指標關係之初步研究 8 接縫式混凝土鋪面之應力分析 9 以遺傳演算法及類神神經網路應用於旅行推銷員問題 10 都市個體運具轉換行為與模式可移轉性研究 11 出國觀光消費者行為與支出特性之研究 12 倒推起迄表模式評估及其區間推定之研究-以淡水地區為例 13 高速公路雙車道車流模式驗證比較分析之研究 14 多席訂位與多站停靠之艙位規劃模式 15 通信上班需求模式之建立

 簡易查詢 | 進階查詢 | 熱門排行 | 我的研究室