华南地震2024，Vol.44Issue(1)：165-174,10.DOI:10.13512/j.hndz.2024.01.19
纤维掺量对花岗岩残积土剪切特性的影响
Effect of Fiber Content on Shear Characteristics of Granite Residual Soil
摘要
Abstract
In order to investigate the shear characteristics of the residual soil under different fiber content,direct shear tests were carried out on the residual soil by using pneumatic direct shear apparatus.Considering fiber content,shear rate,vertical stress and other factors,the effect of fiber content on the shear characteristics of residual soil under different shear rates and vertical stresses is analyzed.The test results show that when the vertical stress is 300 kPa,compared with the undoped fiber,with the fiber content increase from 0 to 0.3%,0.6%and 0.9%,shear strength increases by 23%,46.1%and 79.2%,respectively,that is,the addition of fiber has a significant enhancement effect on the shear strength of granite residual soil.The internal friction angle increases with the increase of fiber content,and the cohesion decreases significantly with the increase of fiber content.Under low vertical stress,the soil is first dilatational and then shrunken,and under high vertical stress,the soil is shrunken constantly.In the case of low-speed shear,the shear rate has little effect on the shear strength characteristics of granite residual soil.The degree of shear expansion increases with increasing shear rate.关键词
纤维加筋/聚丙烯纤维/直剪试验/抗剪强度Key words
Fiber reinforced soil/Polypropylene fiber/Interface between geogrid and soil/Direct shear test/Shear strength分类
建筑与水利引用本文复制引用
付冬平,张弘,林春秀,张欣亚..纤维掺量对花岗岩残积土剪切特性的影响[J].华南地震,2024,44(1):165-174,10.基金项目
国家自然科学基金资助项目(51678352) （51678352）
