研究生: |
林國楨 GUO-ZHEN LIN |
---|---|
論文名稱: |
以聲光耦合技術與分離元素法研探類岩於斜剪試驗之破壞演化 Using Acousto-Optic Coupling Technology and Distinct Element to Investigate the Fracture Evolution of Rock-like Materials during Inclined Shear Tests |
指導教授: |
陳堯中
Yao-chung Chen |
口試委員: |
黃燦輝
none 林銘郎 none 陳立憲 none 歐章煜 none 陳志南 none |
學位類別: |
博士 Doctor |
系所名稱: |
工程學院 - 營建工程系 Department of Civil and Construction Engineering |
論文出版年: | 2013 |
畢業學年度: | 101 |
語文別: | 中文 |
論文頁數: | 159 |
中文關鍵詞: | 斜剪試驗儀 、水泥砂漿 、剪角 、預裂 、聲射法 、電子斑紋干涉術 、叢聚 、初裂 、裂衍 、雙剪裂帶 、分離元素法 |
外文關鍵詞: | distinct element method (DEM), particle flow code (PFC) |
相關次數: | 點閱:190 下載:0 |
分享至: |
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過去對於岩石力學與工程之研究,多於巨觀行為之探討,對不同應力路徑下,微觀裂隙之生、衍等破壞特徵則較少觸及,究其因除受限於傳統力學試驗設備外,欠缺適當之微觀非破壞檢測技術亦為原因。
因此本研究以同步化聲、光非破壞檢測技術應用於研究團隊研發之斜剪試驗儀,調整水泥砂漿配比以模擬中等強度之類岩材料,研探岩材受剪行為下,其剪角(客體)與預裂(主體)之影響,並以分離元素法軟體PFC2D進行數值分析,用以適切探討類岩在斜剪試驗下之力學行為,冀能研探從微觀至巨觀之破壞機制,作為科學與工程應用之佐參。
在平面應力之受剪狀態下,探討下列變數之影響:(1)斜剪角度(β=50∼75°)、(2)預裂之幾何形狀(試體中央無預裂、扁長型與圓孔型預裂),以開口位移控制(COD)求完整加載歷程。並可藉由聲射(AE)技術研探岩材內部受剪產生微震裂源(microseismic locations)之發生時機與空間分佈,與電子斑紋干涉術(ESPI)所偵測之岩材外部因受剪變形引致之干涉影像同步比對,以研探類岩材料之三項破壞演化特徵:叢聚(localization)、初裂(initiation of crack)與裂衍(crack propagation)。
試驗結果顯示,受剪勁度與剪力強度隨剪角增大而降低,且其破壞之裂衍角有方向改變之趨勢乃至其值亦隨之增大,即產生之裂縫由相對高正向應力(β = 50°)之剪力裂縫,漸變成相對低正向應力下允許膨脹(β = 60°∼75°)之張力裂縫。由初裂後之微震裂源分佈可求得材料之剪裂特徵寬度,發現特徵寬度隨剪角增加而增加。
至於預裂對受剪行為之影響,圓孔型預裂試體中,預裂處有明顯應力集中的現象產生,其裂衍角會隨著剪角β增加而上升。而對AE事件分佈之特徵寬度λd之評估中,在無預裂狀態下隨著β的增加,其λd亦隨之增加;在相同剪角下,圓孔型預裂孔之λd大於無預裂試體。
利用聲射法觀察材料微裂之演化,研析其叢聚之發生時機與其位置,再與電子斑紋干涉術所觀察到之初裂與裂衍位置比對,發現兩者所觀察到之破壞趨勢約略一致。經由試驗與數值分析進行破壞機制之分析比對與驗證,初步確立整體彈性、塑性及破壞歷程之演化行為,未來可進一步探討相關岩體或節理之受剪行為。
Most of the experimental studies in rock mechanics and engineering were conducted in the viewpoint of macro-scale, only a few researches focused on the microscopic fracture characteristics such as crack initiation and propagation in stressed rock due to the limitation of nondestructive techniques.This experimental study, therefore, aims at the synchronization of both acoustic and optical nondestructive techniques to investigate the effects of shear angle and pre-existing crack on rock-like material (mortar) under inclined shear tests.
Based on the plane stress condition of shearing specimen under COD (crack opening displacement) control, a series of experimental tests were performed to obtain entire loading curves by varying: (1) the inclined angle, ranging from 50 to 75°, and (2) the material geometry, with or without pre-existing crack (penny and circular shapes in the middle of specimen). In conjunction of both AE (acoustic emission) which was to detect the micro-seismic activities within the rock, and ESPI (electronic speckle pattern interferometry) which was to detect the deformation field on the rock surface, the evolution of fracture could be examined during the shearing process.
The results show that three fracturing characterizations have been verified corresponding to the inclined shear test: localization, crack initiation and propagation.
Test results showed that both shear stiffness and peak shear stress decreased with increasing inclination angle β, and the crack deviation angle would also change direction and increase in value. The crack characteristic was shear fracture for β = 50 test with relatively high normal stress condition and changed to be tensile fracture for β > 50 test with relatively low normal stress condition. The intrinsic width of macro-crack could be evaluated by analyzing the distribution of microseismic activities after crack initiation. It is found that the intrinsic width increases with increasing inclination angle.
Furthermore, experiments without pre-existing crack show that the larger the shear angle, the wider the width of the AE events, λd. Experiments with pre-existing circular crack display the wider λd compared with the one without pre-existing crack.
AE can be used to detect the localization while ESPI can be used to verify crack initiation and propagation. Both results were compared with each other and depicted a good agreement. By synchronizing both AE and ESPI techniques, it could be used to examine the shearing mechanism in rock mass and jointed rock as well.
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