摘要
为探究玄武岩纤维应用于黄土加筋的作用机理,本文采用三轴试验和电镜扫描试验分析了玄武岩纤维尺寸、掺量、含水率等因素对加筋黄土试样的偏应力—应变曲线、抗剪强度指标及微观结构的影响。结果表明:(1)不同纤维尺寸加筋作用下,试样偏应力—应变曲线变化趋势相似,且试样抗剪强度随掺量的增加均呈现先增加后减小的趋势,但各自所对应的最优掺量有所区别。(2)试样抗剪强度的提高主要体现在土体黏聚力的提高,内摩擦角变化不明显。(3)加筋土样中土颗粒与纤维的接触形式及纤维的受力特点与纤维的尺寸及掺量有关。(4)纤维的加筋效果由多种因素相互作用所决定,当纤维尺寸为12 mm,掺量为0.4%时加筋效果最优。玄武岩纤维合理掺加可有效增强黄土抗剪强度,改变土体微观结构。
Triaxial tests and Scanning Electron Microscopy(SEM) tests are used to analyze the effects of basalt fiber size, content, water content and other factors on the deviatoric stress-strain curve, shear strength index and microstructure of reinforced loess samples in order to explore the mechanism of basalt fiber applied to loess reinforcement.The results show that:(1)Under the effects of reinforcement with different fiber sizes, the variation trend of specimen’s partial stress-strain curve is similar.The shear strength of specimen increases first and then decreases with the increase of reinforcement, while the corresponding optimal amount of reinforcement is different.(2)The improvement of shear strength of the sample is mainly reflected in the improvement of soil cohesion.The variation of internal friction angle is not obvious.(3)The contact form of soil particles and fibers in reinforced soil samples as well as the mechanical characteristics of fibers are related to the size and content of fibers.(4)The reinforcement effect of fiber is determined by the interaction of various factors.The reinforcement effect is optimal when the fiber size is 12 mm and the content is 0.4%.The reasonable addition of basalt fiber can effectively enhance the shear strength of loess and change the microstructure of soil.
作者
杨若辰
张吾渝
童国庆
刘成奎
YANG Ruochen;ZHANG Wuyu;TONG Guoqing;LIU Chengkui(School of Civil Engineering,Qinghai University,Xining 810016,China;Key Laboratory of Energy-saving Building Materials and Engineering Safety of Qinghai,Xining 810016,China;Qinghai Building and Materials Research Co.,Ltd.,Xining 810008,China;Qinghai Provincial Key Laboratory of Plateau Green Building and Eco-community,Xining 810008,China)
出处
《青海大学学报》
2022年第6期61-67,共7页
Journal of Qinghai University
基金
国家自然科学基金项目(52168054)
青海省高原绿色建筑与生态社区重点实验室开放基金计划项目(KLKF-2021-007)
作者简介
杨若辰(1998—),男,河北石家庄人,青海大学在读硕士研究生;通信作者:张吾渝,E-mail:qdzwy@163.com
