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玄武岩纤维加筋黏土的剪切强度特性

高磊, 胡国辉, 杨晨, 相超, 傅钧义, 徐楠

高磊, 胡国辉, 杨晨, 相超, 傅钧义, 徐楠. 玄武岩纤维加筋黏土的剪切强度特性[J]. 岩土工程学报, 2016, 38(zk1): 231-237. DOI: 10.11779/CJGE2016S1043
引用本文: 高磊, 胡国辉, 杨晨, 相超, 傅钧义, 徐楠. 玄武岩纤维加筋黏土的剪切强度特性[J]. 岩土工程学报, 2016, 38(zk1): 231-237. DOI: 10.11779/CJGE2016S1043
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GAO Lei, HU Guo-hui, YANG Chen, XIANG Chao, FU Jun-yi, XU Nan. Shear strength characteristics of basalt fiber-reinforced clay[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(zk1): 231-237. DOI: 10.11779/CJGE2016S1043
Citation: GAO Lei, HU Guo-hui, YANG Chen, XIANG Chao, FU Jun-yi, XU Nan. Shear strength characteristics of basalt fiber-reinforced clay[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(zk1): 231-237. DOI: 10.11779/CJGE2016S1043
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玄武岩纤维加筋黏土的剪切强度特性  English Version

  • 河海大学岩土力学与堤坝工程教育部重点实验室,江苏 南京 210098

基金项目: 高等学校博士学科点专项科研基金新教师类资助课题（20120094120015）; 江苏省自然科学基金项目（BK20130832）; 国家自然科学基金项目（51508159）
详细信息
    作者简介:

    高 磊(1984- ),男,汉族,宁夏银川人,博士,讲师,主要从事岩土和地质工程方面的研究。E-mail: taiyang360@gmail.com。

Shear strength characteristics of basalt fiber-reinforced clay

  • Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China

摘要

    摘要
  • 摘要: 为了了解玄武岩纤维加筋黏土的剪切强度特性,将玄武岩纤维丝均匀地掺入黏土中,在控制含水率和干密度的条件下,进行了直剪试验,并借助扫描电镜,从微观层面对剪切面上的土体进行了观察。试验中,按纤维与干土质量的百分比0.0%,0.15%,0.25%,0.35%配制了试样,并从400 kPa压力下的剪切面中选取代表性土样进行微观测试。直剪试验结果表明：随着纤维掺量的增加,土样的黏聚力c不断增大;和素土相比,在掺量不超过0.25%时,加筋土样的内摩擦角φ变化不大,当掺量达到0.35%时,内摩擦角φ有突然且较为显著的增大。SEM结果表明：掺量为0.25%时,纤维在土体中的离散程度最高,纤维与土体间的作用方式主要为握裹作用和纤维网作用;剪切过程中,纤维在土体中易发生滑移和磨损,其中玄武岩纤维的磨损不同于其它纤维,主要表现为端部的磨损,表面仍较为平整。
    Abstract: To study the shear strength characteristics of basalt fiber-reinforced clay, a series of direct shear tests on clay reinforced by dispersed basalt fiber are performed under controlled water content and dry density conditions. With the application of scanning electron microscope (SEM), the soil particles on shear surface are investigated at micro level. The ratio of fiber content to dry soil by weight is 0. 0%,0. 15%,0. 25% and 0. 35%. And the representative soil samples are selected from shear surface under stress of 400 kPa for micro tests. The experimental results show that the inclusion of basalt fiber in clay can enhance the cohesive stress of soil, which increases with the increasing fiber content. Compared with that of pure soil, the internal friction angle of basalt fiber-reinforced clay changes little when the content is not higher than 0.25%. But when the content reaches 0.35%, the internal friction angle increases abruptly. At micro level, the dispersion of fiber in soil is the highest when the content is 0.25%. The interfacial interaction between fiber and soil particles mainly includes gripping effect of single fiber and fiber-net effect. The fiber on the shear surface may be either slipped or broken during shear, which the breaking of basalt fiber is different from that of other fibers. The ends of fiber are mainly broken, while the surface is smooth.
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  • 收稿日期:  2015-11-29
  • 发布日期:  2016-03-24

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