本研究參考貫切破壞試驗結合聲射檢測所得微裂縫開裂行為之試驗結果，嘗試以分離元素法之PFC2D數值分析程式模擬接觸破壞理論，分析單一機械刃口與類岩之水泥砂漿試體承受貫切乃至於破壞之演化機理，從而將數值分析與實驗作一比較並歸納結論。根據數值分析結果顯示，分離元素法PFC2D程式可有效模擬二維之正向楔形貫切試驗破壞行為，其中剪力裂縫分佈叢聚情形及張力裂縫垂直向下延伸情形與實際實驗結果甚為吻合。
本研究初步探討相關參數對數值模擬之影響，藉以瞭解試體微觀裂縫破壞行為。研究中探討數值分析顆粒最大與最小尺寸比為1.4時，可得較佳之結果。另貫刀下降速率對模擬行為有極大之影響，降低下降速率對模擬貫切破壞行為有較理想之效果。此外摩擦係數設為 1.0 時，剪力裂縫分佈叢聚情形較為明確。
顆粒鍵結採平行鍵結模式，分析其平行鍵結張力與剪力強度比對數值模擬之影響，發現平行鍵結張力與剪力強度比愈小時，剪力裂縫數較少而張力裂縫呈現垂直向下延伸；反之愈大時，剪力裂縫數較多而張力裂縫偏斜情形較嚴重。

This research applied numerical analysis by using a discrete element code, PFC2D , to simulate the indentation tests of the cement mortarspecimens indented by a single blade to investigate the evolution of crackdevelopment. Laboratory results of indentation tests with measurementsof acoustic emission were compared with the numerical results. It isshown that the numerical method could simulate quite well thedistribution of shear cracks and the propagation of tensile cracks.According to the preliminary parametric study, the ratio of maximumparticle size to minimum particle size would have better results when it is1.4. The loading speed has great influence on the simulation results,lowering the loading speed would have much better results. When thecoefficient of friction is 1.0, there is more prominent distribution of shearcracks.
Parallel-bond model was used in this research to define the way ofbonding between particle contacts. The influence of the ratio between thetensile strength and the shear strength of the bonds on the simulation wasstudied. For smaller ratio of tensile/shear strength, the number of shearcracks would be smaller and the tensile cracks would propagatedownwards vertically. For larger ratio of tensile/shear strength, thenumber of shear cracks would be larger and the tensile cracks wouldpropagate downwards with higher angle of deviation from the center line.

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