CAJ | 학술논문

岩石颗粒破碎是影响粒状材料剪切强度和变形的最主要因素，岩石颗粒破碎并不是想象的那么难，像花岗岩颗粒有时在很小的压应力作用下就可以破碎。岩石单颗粒破碎的物理试验结果常常很离散，完成大量单颗粒破碎的物理试验费时费力不现实，采用离散单元法（Discreteelementmethod，DEM）PFC软件模拟单颗粒压缩破碎试验，既能克服单颗粒破碎物理试验的缺陷，又能解决单颗粒破碎物理试验工作量大的难题，是研究单颗粒破碎的理想选择。基于 DEM的软件 PFC2D，将粒径为0.075～0.1245mm的基本粒子捆绑成不同粒径的单颗粒，模拟岩石单颗粒压缩破碎试验，观察颗粒破碎演化过程，统计单颗粒破碎强度。计算单颗粒压缩破碎后颗粒分布的分维，验证单颗粒破碎强度的分形模型和单颗粒破碎强度的尺寸效应。文中引用玄武岩单颗粒破碎试验结果，与单颗粒破碎的离散单元模拟结果进行比较，验证单颗粒破碎强度的尺寸效应和修正的 Weibull理论的离散单元模拟结果。
암석과립파쇄시영향립상재료전절강도화변형적최주요인소，암석과립파쇄병불시상상적나요난，상화강암과립유시재흔소적압응력작용하취가이파쇄。암석단과립파쇄적물리시험결과상상흔리산，완성대량단과립파쇄적물리시험비시비력불현실，채용리산단원법（Discreteelementmethod，DEM）PFC연건모의단과립압축파쇄시험，기능극복단과립파쇄물리시험적결함，우능해결단과립파쇄물리시험공작량대적난제，시연구단과립파쇄적이상선택。기우 DEM적연건 PFC2D，장립경위0.075～0.1245mm적기본입자곤방성불동립경적단과립，모의암석단과립압축파쇄시험，관찰과립파쇄연화과정，통계단과립파쇄강도。계산단과립압축파쇄후과립분포적분유，험증단과립파쇄강도적분형모형화단과립파쇄강도적척촌효응。문중인용현무암단과립파쇄시험결과，여단과립파쇄적리산단원모의결과진행비교，험증단과립파쇄강도적척촌효응화수정적 Weibull이론적리산단원모의결과。
The most important engineering properties of coarse granular materials such as stressstrain and strengthbehavior,volume change and shear strength depend on the amount of grain breakages that occur when the stressesimposed on soil particles exceed their strength.Grain breakages(such as granite grains may occur even at relativelylow compressive stresses)depend on the character of the individual rock grains.Experiments of grain breakagesusually lead scatter data,and are time consuming to perform.A good method based on discrete element method(DEM)gives a potentially useful tool to study single grain breakage.A number of basical particles with diameters of0.075 ~0.1 245mm are bundled up a grain aggregate using PFC2D.Grain aggregates are used to simulate rock grain.Fractal model and size effect of breakage strength are analysed using grain aggregate based on PFC2D.Experimentaldata of basalt grain crushing are cited to verify the DEM simulation of the size effect of crushing strength and themodified Weibull modle.