CAJ | 학술논문

粗粒料在外力作用下存在明显的颗粒破碎特性，研究颗粒破碎过程是当前研究的热点问题之一。基于粗粒料单颗粒破碎机制，考虑单颗粒破碎强度与直径的变化规律，采用非线性接触H-Z模型和密度控制法建立了粗粒料颗粒破碎数值模型。开展粗粒料双轴剪切试验数值模拟研究，并与室内试验结果进行对比分析。研究表明：建立的粗粒料颗粒破碎数值模型能够较好地模拟粗粒料偏应力与轴向应变和体积应变与轴向应变的关系；数值模拟获得的粗粒料颗粒破碎率与室内试验结果基本一致；去除试样制备过程和固结过程引起的颗粒破碎，不同围压条件下的颗粒破碎率归一化后基本重合，且可以近似地采用双曲线函数进行拟合。颗粒破碎率随着围压的增大，逐渐增大，试验级配趋于Einav提出的颗粒破碎的最终级配（分维数等于2.6）
조립료재외력작용하존재명현적과립파쇄특성，연구과립파쇄과정시당전연구적열점문제지일。기우조립료단과립파쇄궤제，고필단과립파쇄강도여직경적변화규률，채용비선성접촉H-Z모형화밀도공제법건립료조립료과립파쇄수치모형。개전조립료쌍축전절시험수치모의연구，병여실내시험결과진행대비분석。연구표명：건립적조립료과립파쇄수치모형능구교호지모의조립료편응력여축향응변화체적응변여축향응변적관계；수치모의획득적조립료과립파쇄솔여실내시험결과기본일치；거제시양제비과정화고결과정인기적과립파쇄，불동위압조건하적과립파쇄솔귀일화후기본중합，차가이근사지채용쌍곡선함수진행의합。과립파쇄솔수착위압적증대，축점증대，시험급배추우Einav제출적과립파쇄적최종급배（분유수등우2.6）
The coarse aggregate can show significant particle breakage characteristics under external force loading. Studying the particle breakage process is one of the research focuses at present. Based on one coarse particle failure mechanism, a numerical model for particle breakage is developed, in which the nonlinear contact H-Z model and a density-control method are introduced and the variation of a single particle breakage strength and diameter are considered. Based on the proposed model, the biaxial shear test of coarse aggregate is carried out and compared with the laboratory test results. It is shown that the proposed particle breakage numerical model can describe well the relationship between deviatoric stress and axial strain, and the relationship between volume strain and axial strain. The particle breakage ratio obtained by numerical simulation is consistent with the results obtained by laboratory test. The normalized particle breakage ratios under different confining pressures are practically coincident, and can be fitted by a hyperbolic curve function without considering particle breakage in sample preparation and consolidation processes. As the confining pressure increases, the particle breakage ratio increases, and the final grading curve of sample coincides with that proposed by Einav, which has a fractal dimension of 2.6.