| 玄武岩纤维加筋黄土承载比试验研究 |
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| 引用本文： | 李沛达,骆亚生,陈箐芮,汪国刚.玄武岩纤维加筋黄土承载比试验研究[J].水文地质工程地质,2021,48(1):131-137. |
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| 作者姓名： | 李沛达 骆亚生 陈箐芮 汪国刚 |
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| 作者单位： | 西北农林科技大学水利与建筑工程学院，陕西 杨凌 712100 |
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| 基金项目： | 国家重点研发计划资助(2017YFC0504703)。 |
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| 摘 要： | 为研究纤维加筋黄土CBR值影响因素及纤维增强土体机理，以短切玄武岩纤维为筋材，通过改变土体含水率、纤维长度、纤维含量、击实次数、浸水时间等条件进行加州承载比试验，探究初始含水率、纤维参数及试验方法对加筋土局部抗剪强度的影响规律。结果表明:纤维加筋土CBR值随含水率的增加呈现先增大后减小的趋势，存在“施工最优含水率”且相比击实试验最优含水率高1%～3%左右；纤维加筋土CBR值高于黄土CBR值，确定纤维长度20 mm，纤维含量0.4%为最优配比；击实次数从30击增加到98击,黄土CBR值提高273%，纤维加入后CBR值提高327%，加筋作用使土体通过提高击实功来提升强度的效果更加显著；浸水对试样CBR值影响较大，浸水时间对试样CBR值影响较小，且纤维的加入使试样对浸水时间的敏感度进一步降低，加筋土浸水2 d后强度降低54%，浸水4 d后强度降低58%。
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| 关 键 词： | CBR值 含水率 纤维含量 纤维长度 击实次数 浸水时间 |
| 收稿时间： | 2020-02-25 |
An experimental study of the California bearing ratio of basalt fiber reinforced loess |
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| LI Peida,LUO Yasheng,CHENG Qingrui,WANG Guogang.An experimental study of the California bearing ratio of basalt fiber reinforced loess[J].Hydrogeology and Engineering Geology,2021,48(1):131-137. |
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| Authors: | LI Peida LUO Yasheng CHENG Qingrui WANG Guogang |
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| Institution: | College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: | In order to study the factors affecting the CBR value of the fiber-reinforced loess and the mechanism of the fiber-reinforced soil,chopped basalt fiber was used as the reinforcement material,and the CBR test was performed by changing the moisture content,fiber length,fiber content,compaction times and soaking time.The experiment explored the influence of initial moisture content,fiber parameters and test methods on the local shear strength of the reinforced soil.The results show that the CBR value of the fiber-reinforced loess has a tendency of increasing first and then decreasing with increasing moisture content.There is an"optimal moisture content for construction"and it is about 1%greater than the optimal moisture content of the compaction test.The CBR value of the reinforced soil is higher than the CBR value of loess.It is found that the fiber length of 20 mm and the fiber content of 0.4%are the optimal ratio.The compaction times increase from 30 to 98,the CBR value increases by 273%,the CBR value increases by 327%after the fiber is added.Reinforcement makes the soil local shear strength more effective by increasing the compaction work.The water immersion has a greater effect on the CBR value of the sample and the soaking time has less effect on it.The sensitivity of the sample to the soaking time is further reduced by the addition of fibers.The strength is reduced by 54%after 2 days of soaking,and the strength is reduced by 58%after 4 days of soaking. |
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| Keywords: | CBR value moisture content fiber content fiber length compaction times soaking time |
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