| 稻壳灰加筋土力学性能研究 |
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| 引用本文： | 李丽华,余肖婷,肖衡林,马强,刘一鸣,杨 星.稻壳灰加筋土力学性能研究[J].岩土力学,2020,41(7):2168-2178. |
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| 作者姓名： | 李丽华 余肖婷 肖衡林 马强 刘一鸣 杨 星 |
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| 作者单位： | 1. 湖北工业大学 土木建筑与环境学院，湖北 武汉 430068；2. 湖北工业大学 生态道路工程研究中心，湖北 武汉 430068 |
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| 基金项目： | 国家自然科学基金项目（No. 51678224，No. 51778217）；湖北省杰出青年基金项目（No. 2018CFA063）；省中央引导地方科技发展专项（No.2019ZYYD053，No.2018ZYYD005）。 |
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| 摘 要： | 稻壳灰与土体混合应用，一方面废弃资源再利用，环保，又可增强土体强度。通过三轴试验，研究不同比例稻壳灰混合黏土及其加筋土应力?应变性能、强度特性以及不同应变水平下模量、偏应力及加筋强度比等土体变化特征。试验结果表明，随稻壳灰比例增加，混合土最大干密度显著减小，最优含水率显著增加。添加不同比例稻壳灰对加筋土抗剪强度有较大影响，10%～15%稻壳灰比例下，加筋稻壳灰混合土初始切线模量和应力峰值达到最大，抗剪强度较优。与土工织物加筋稻壳灰混合土相比，土工格栅加筋稻壳灰混合土偏应力及抗剪强度更大，土工格栅层数对土体抗剪强度增大效果更明显，对应的应力?应变曲线拐点也更突出。试样弹性模量与稻壳灰比例及筋材种类、层数有关，加入稻壳灰后，土体弹性模量增长显著，土工格栅加筋稻壳灰混合土较优比例下可增加1.5倍多，稻壳灰及筋材均能有效提高土体强度。随加筋层数增加，稻壳灰混合土加筋强度比明显增大，与围压关系较小。
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| 关 键 词： | 稻壳灰 三轴试验 加筋土 应力?应变 强度 |
| 收稿时间： | 2019-01-28 |
| 修稿时间： | 2019-08-21 |
Mechanical properties of reinforcement about rice husk ash mixed soil |
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| LI Li-hua,YU Xiao-ting,XIAO Heng-lin,MA Qiang,LIU Yi-ming,YANG Xing.Mechanical properties of reinforcement about rice husk ash mixed soil[J].Rock and Soil Mechanics,2020,41(7):2168-2178. |
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| Authors: | LI Li-hua YU Xiao-ting XIAO Heng-lin MA Qiang LIU Yi-ming YANG Xing |
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| Institution: | 1. School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan, Hubei 430068, China;
2. Ecological Road Engineering Research Center, Hubei University of Technology, Wuhan, Hubei 430068, China |
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| Abstract: | The rice husk ash, which is environmental friendly waste-recycling, can strengthen the soil. Triaxial tests were conducted to study the stress-strain properties, strength characteristics, and variation characteristics at different strain levels including the elastic modulus, deviator stress and reinforcement strength ratio of rice husk ash mixed clay with different proportions of rice husk ash and its reinforced soil. The test results show that the maximum dry density of the mixed soil reduces significantly and the optimum moisture obviously increases with the increase of rice husk ash content. The content of rice hush ash has a great influence on the shear strength of the reinforced soil, and rice husk ash-soil mixture’ s initial tangent modulus and peak stress that addition of 10%?15% rice husk ash is recommended as the maximum. Compared with geotextile reinforced rice-husk-ash mixed soil, higher deviatoric stress and shear strength are observed on specimens with geogrid, and this trend is more obvious with the increase of the number of reinforcement layers. It also shows that the inflection point of the stress-strain curve is more prominent with the increase of the number of reinforcement layers. The elastic modulus of the mixture material depends on the content of rice husk ash, the type and layers of reinforcement. After adding the rice husk ash, the elastic modulus of the soil increases significantly, and it increases 1.5 times in better content when reinforced by geogrid, both rice husk ash and the reinforcement can effectively strengthen the soils. As the number of reinforced layer increases, the reinforcement strength of rice husk ash-soil mixture increases significantly but has little relation with the confining pressure. |
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| Keywords: | rice husk ash triaxial test reinforced soil stress-strain strength |
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