摘要
为探究玻璃纤维对红黏土的加固机理,通过室内无侧限抗压强度试验,并结合离散元技术进行数值分析,研究不同纤维含量下加筋土的力学特性。基于微裂纹演化过程探究各损伤阶段微裂纹与力学演化特征,并揭示加筋土细观损伤机理。研究结果表明:加筋土的单轴抗压强度大于红黏土,玻璃纤维含量为0.1%时加筋土单轴抗压强度最大。玻璃纤维能有效减缓土体中裂纹的快速扩展,导致加筋土抗压强度的增强。纤维含量越高加筋土所能承受的损伤程度越小,随着纤维含量的增加,加筋土易沿纤维面发生局部破坏,导致加筋土抗压强度随着纤维含量的增加而减小。
In order to investigate the mechanism of the glass fiber to reinforce the red clay,numerical simulations were performed using the discrete element method.The mechanical properties of reinforced soils with different levels of fiber content were studied from laboratory tests.The meso-damage stages of reinforced soil were divided based on the evolution of meso-crack,and the evolution of mechanical properties and meso-crack characteristics were investigated in different stages.The meso-damage mechanism of reinforced soil was revealed.The results show that the unconfined compressive strength(UCS)of reinforced soil is greater than the unreinforced red clay.The UCS of reinforced soil is the largest when the content of glass fiber is 0.1%.The UCS of reinforced soil increases,because the glass fiber effectively obstructs the rapid growth of meso-cracks in the soil.The degree of damage that the reinforced soil can withstand is less when the fiber content is higher.As the fiber content increases,the reinforced soil is more prone to localized damages along the fiber interface,thus resulting in decreased UCS of reinforced soil.
作者
蒋志琳
王崇淦
肖伟
阮波
JIANG Zhilin;WANG Chonggan;XIAO Wei;RUAN Bo(Hunan Zhongda Design Institute Co.,Ltd,Changsha 410075,China;School of Civil Engineering,Central South University,Changsha 410075,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2020年第6期1404-1410,共7页
Journal of Railway Science and Engineering
关键词
玻璃纤维加筋土
离散元方法
微裂纹
力学特性
机理
glass fiber reinforced soil
discrete element method
meso-cracks
mechanical properties
mechanism
