【作者】 张志华； 张国栋； 李泯蒂； 廖炜； 徐志华； 宋琨；

【Author】 ZHANG Zhi-hua;ZHANG Guo-dong;LI Min-di;LIAO Wei;XU Zhi-hua;SONG kun;National Field Observation and Research Station of Landslides In Three Gorges Reservoir Area of Yangtze River,China Three Gorges University;HuBei Engineering Research Center of Geological Hazards Prevention,Three Gorges University;Collaborative Innovation Center for Geo-hazards and Eco-environment in Three Gorges Area,Three Gorges University;

【机构】 三峡大学湖北长江三峡滑坡国家野外科学观测研究站； 三峡大学湖北省地质灾害防治工程技术研究中心； 三峡大学三峡地区地质灾害与生态环境湖北省协同创新中心；

【摘要】 为研究黏结材料中哪些细观参数是材料力学特性宏观反应的主要影响参数,基于离散元颗粒流理论,以PFC2D为工具,自编程序,以粗粒土为黏结材料作为研究对象,以室内三轴固结排水试验作为基础,通过数值试验模拟三轴室内试验结果,并分析材料中颗粒半径大小、摩擦系数、粘结剂强度对材料宏观力学特性的影响程度。结果表明:用PFC2D模拟三轴试验,模拟结果不能精确吻合试验室内的结果;颗粒半径参数与土体强度的关系为二次函数;摩擦系数直接影响土体的摩擦角的大小,且材料摩擦角在摩擦系数较小时的影响敏感性较强;粘结剂强度直接影响材料的抗剪强度,且抗剪强度与CBSR呈正线性相关。在粘结剂强度取值在一定范围内,试样压缩裂隙数量随着粘结剂强度的增大而增大。更多还原

【Abstract】 To research which mesoscopic parameters of bonding materials are the main influence parameters of material mechanical properties macroscopic reaction,this article is based on discrete element particle flow theory,by means of PFC2 D,self-programming and using coarse grain soil to be the bonding material as the research object,based on laboratory triaxial consolidation test and by numerical experiments simulating the laboratory test results,and analyzing the influence of the particle size,friction coefficient,the contact bond strength of materials on the macroscopic reaction.The results show that the simulation results by PFC2 D triaxial test can not match the laboratory results accurately;the relationship between Particle radius and soil strength is quadratic;Friction coefficient directly affects the material friction Angle,and the friction Angle of material influence sensitivity by friction factor is stronger when the friction coefficient is small;Contact bond strength directly affects the shear strength of materials,and shear strength was positively linear correlation with CBSR.When the adhesive strength values within a certain range,sample compression fracture number increases with the strength of the contact bond strength.更多还原