CAJ | 학술논문

　　粗粒料是一定级配的岩石颗粒集合体，具有独特的物理力学特性。以粗粒料室内三轴固结排水试验成果为基础，基于离散元颗粒流理论，从细观角度出发，以PFC3D为工具，通过自编程及二次开发，得到按级配生成的粗粒料三轴试验数值模型。引入clump颗粒考虑颗粒形状对粗粒料强度及变形的影响，分析剪胀、颗粒形状、颗粒重排的关系。结果表明：颗粒形状是影响粗粒料强度与变形的主要因素，在其他细观参数一定的情况下，改变颗粒形状，可以显著影响粗粒料的力学行为；BPM模型的应力-应变关系只在低围压下与试验值吻合，随着围压的增大，偏差越来越大；而引入clump颗粒的PFC3D数值模型能很好地模拟粗粒料室内三轴固结排水试验的应力-应变特性，但由于BPM及clump都是刚性颗粒，没有考虑颗粒变形及破碎，造成应变剪胀偏大。
　　조립료시일정급배적암석과립집합체，구유독특적물리역학특성。이조립료실내삼축고결배수시험성과위기출，기우리산원과립류이론，종세관각도출발，이PFC3D위공구，통과자편정급이차개발，득도안급배생성적조립료삼축시험수치모형。인입clump과립고필과립형상대조립료강도급변형적영향，분석전창、과립형상、과립중배적관계。결과표명：과립형상시영향조립료강도여변형적주요인소，재기타세관삼수일정적정황하，개변과립형상，가이현저영향조립료적역학행위；BPM모형적응력-응변관계지재저위압하여시험치문합，수착위압적증대，편차월래월대；이인입clump과립적PFC3D수치모형능흔호지모의조립료실내삼축고결배수시험적응력-응변특성，단유우BPM급clump도시강성과립，몰유고필과립변형급파쇄，조성응변전창편대。
Coarse grained material is the aggregation of rock particles with certain gradation, which has special physical and mechanical properties. Based on the results of consolidated-drained triaxial tests and three-dimensional particle flow code theory, the numerical model of triaxial test for coarse grained materials is obtained by programming and redevelopment of PFC3D (particle flow code of three-dimension) from the view of mesoscopic scale. The influence of particle shape on strength and deformation of coarse grained materials is considered by introducing clump particles. The relations among dilation, particle breakage and rearrangement are analyzed. The numerical results show that particle shape is the main factor affecting the strength and deformation of coarse grained materials. Changing the particle shape can significantly affect the mechanical behavior of coarse grained materials in the case of other mesoscopic parameters unchanged. The stress-strain relationship of bonded-particle model (BPM) is agreed with experimental result only under low confining pressure; the deviation is growing larger with the increase of confining pressure. The stress-strain characteristics of coarse grained materials in consolidated-drained triaxial tests are simulated by PFC3D model using clump particles accurately. The BPM and clump particles are both rigid particles. The shear dilatancy is too large because the particle deformation and breakage are not considered.