本研究係透過數值分析方法模擬材料在三軸(含單壓)試驗條件下之力學行為,並針對材料的微觀參數作改變情況下,所對應的巨觀參數變化作探討。本研究係以分離元素法(Distinct Element Method)之三維數值軟體PFC3D模擬圓球顆粒元素間之微觀非連續體之力學行為,並建立元素之微觀參數與整體材料巨觀參數相互關聯性之敏感度分析。以三軸試驗為例,透過顆粒元素之間微觀參數的設定,進行PFC3D之模擬結果,獲得不同微觀參數設定下所對應之整體巨觀參數,而就材料微、巨觀參數校核之關聯性探討,得知材料巨觀彈性模數與單壓強度,分別與顆粒元素之微觀彈性模數和顆粒間鍵結強度約成正比關係;另一材料巨觀參數-柏松比則與微觀顆粒元素之正/切向勁度比成正相關;材料整體巨觀摩擦角則與元素微觀之粒間摩擦係數成正面影響。 選擇三軸(含單壓)試驗作為數值分析之試驗,因而獲得材料微、巨觀參數之敏感度分析結果,使用統計分析軟體-SPSS作分析,使用迴歸方法,將其初步微、巨觀參數之間以迴歸方程式加以表示關係,提供日後欲使用PFC3D模擬顆粒與鍵結等諸微觀材料參數調準而滿足所欲模擬材料巨觀參數之研究工作參考方向。
This study analyzed through numerical method to simulate materials in triaxial (including single pressure) mechanical behavior under test conditions, and for the microscopic parameters for changing the material circumstances, the corresponding macroscopic parameters as discussed This study is based on the Distinct Element Method Numerical software PFC3D Simulation microscopic spherical particles between elements of the mechanical behavior of non-continuum, and to establish the elements of microscopic parameters and the overall macroscopic material parameter sensitivity analysis of interconnectedness. In triaxial tests, for example, elements through microscopic particles parameter settings for PFC3D the simulation results obtained under different microscopic parameters set corresponding overall macroscopic parameters, in respect material of micro and macro parameter checking investigate the association , That material macroscopic elastic modulus and uniaxial compressive strength, respectively, with the microscopic particle elements elastic modulus and bond strength between particles is proportional approximately,another material macroscopic parameters - Poisson's ratio is positively related to particles of the elements of positive / tangential stiffness ratio. Used statistical analysis software-SPSS as analysis using regression methods, represent between the micro, macro parameter relationships by regression equation, in future PFC3D simulated particles and bonding material parameters such as the alignment of various microscopic and macroscopic materials to meet the desired simulated parameters reference direction of research work.
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