基于承载板试验的风化千枚岩填料细观研究  

Microscopic Study of Weathered Phyllite Based on Bearing Plate Test

作　　者：王悦月 毛雪松[1,2] 李汶霖[1,2] WANG Yue-yue;MAO Xue-song;LI Wen-lin(School of Highway,Chang'an University,Xi'an 710064,Shaanxi,China;Key Laboratory for Special Area Highway Engineering of Ministry of Education,Chang'an University,Xi'an 710064,Shaanxi,China)

机构地区：[1]长安大学公路学院,陕西西安710064 [2]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064

出　　处：《筑路机械与施工机械化》2019年第11期36-40,45,共6页Road Machinery & Construction Mechanization

基　　金：国家自然科学基金资助项目（211021130246）;中央高校基本科研业务费专项资金资助项目（300102218408）

摘　　要：为了解风化千枚岩填料在承载板试验中的细观变化,本文运用离散单元法颗粒流理论,采用粒间作用为平行黏结模型的圆球模拟土颗粒为研究对象,建立PFC2D计算模型,模拟了风化千枚岩颗粒在加载和卸荷状态下的应力-应变关系以及颗粒间的细观规律。数值计算结果和试验实测结果的比较表明:由p-l曲线计算的回弹模量值满足设计规范要求;位移场及接触应力场的变化现象与室内小型承载板试验宏观现象比较相似。In order to understand the microscopic change of weathered phyllite in the bearing plate test,based on the laboratory experiments and the particle flow theory of discrete element method,the spheroids of inter-granular interaction model were used to simulate soil particles.The PFC2D calculation model was established to simulate the stress-strain relationship of weathered phyllite particles under loading and unloading conditions and the microscopic regularity between particles.The comparison between the numerical calculation results and the experimental results shows that the rebound modulus value calculated by the p-l curve meets the design specifications,and the variation of the displacement field and the contact stress field is similar to the macroscopic phenomenon of small-sized bearing plate test in laboratory.

关 键 词：路基填料 风化千枚岩 回弹模量 细观规律 

分 类 号：U416.03[交通运输工程—道路与铁道工程]