摘要
近年来,废弃轮胎的数量持续增多,其合理处置成为亟待解决的问题。为探索大规模处理废弃轮胎的有效途径,开展了利用废弃轮胎衍生橡胶纤维改良膨胀土的可行性研究。首先利用直剪试验,探究不同橡胶纤维掺量对膨胀土力学特征的影响,然后基于离散模型建立了橡胶纤维加筋膨胀土的强度预测模型。结果表明:与原状膨胀土相比,纤维掺量为5%和10%的橡胶纤维加筋膨胀土的强度提升显著,其中掺量为10%时强度提升最大;橡胶纤维可增强膨胀土的黏聚力,但对内摩擦角影响极小;当橡胶纤维掺量达到15%时,橡胶纤维相互黏附,纤维难以被土颗粒完全包覆,形成土颗粒断层,导致土壤强度下降。在离散模型的基础上提出了橡胶纤维加筋膨胀土的强度预测模型,可有效预测橡胶纤维加筋膨胀土的剪切强度。
In recent years,the number of waste tires has continued to increase,and finding a reasonable way to dispose of waste tires has become an urgent problem.To find a way to deal with a large number of waste tires,this paper investigates the feasibility of using rubber fibers to improve expansive soil.Firstly,Direct shear tests were employed to investigate the effects of different rubber fiber contents on the mechanical characteristics of expansive soil.Then,a strength prediction model for rubber fiber reinforced expansive soil was developed based on the discrete model.The results shows that there is an enhancement in the strength of rubber fiber reinforced expansive soil with 5%and 10%fiber content compared to expansive soil,with the maximum strength enhancement at 10%rubber fiber content.Rubber fibers enhance the cohesion of expansive soil and have little effect on the internal friction angle.When the rubber fiber content is 15%,the rubber fibers adhere to each other and the fibers cannot be completely covered by the soil particles,which produces faults in the soil particles and thus reduces the soil strength.A strength prediction model for rubber fiber-reinforced expansive soil is proposed based on the discrete model,which effectively predicts the shear strength of rubber fiber-reinforced expansive soil.
作者
孙振兴
杨忠年
辛泽宇
王荣昌
张莹莹
凌贤长
Sun Zhenxing;Yang Zhongnian;Xin Zeyu;Wang Rongchang;Zhang Yingying;Ling Xianzhang(School of Civil Engineering,Qingdao University of Technology,Qingdao 266525,Shandong,China;Qingdao Metro Line 6 Co.,Ltd.,Qingdao 266427,Shandong,China;School of Civil Engineering,Harbin Institute of Technology,Harbin 150001,China)
出处
《吉林大学学报(地球科学版)》
北大核心
2025年第5期1644-1654,共11页
Journal of Jilin University:Earth Science Edition
基金
国家自然科学基金项目(42177153)。
关键词
膨胀土
橡胶纤维加筋
直剪试验
剪切强度
强度预测模型
expansive soil
rubber fiber-reinforced
direct shear
shear strength
strength prediction model
作者简介
孙振兴(1999-),男,硕士研究生,主要从事膨胀土改良加固与纤维加筋土方面的研究,E-mail:sunzx99@foxmail.com;通信作者:杨忠年(1985-),男,教授,主要从事岩土工程和隧道工程方面的研究,E-mail:yzhnqd@qut.edu.cn。
