| 硅灰加固宁波软土的试验研究 |
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| 引用本文： | 王泽平,王常明,江南,张在恒.硅灰加固宁波软土的试验研究[J].岩土工程技术,2020(2):111-116,121. |
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| 作者姓名： | 王泽平 王常明 江南 张在恒 |
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| 作者单位： | 吉林大学建设工程学院;宁波市岩土工程有限公司 |
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| 基金项目： | 国家自然科学基金项目(No.41572257,No.41972267)。 |
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| 摘 要： | 为探索硅灰对软土的力学性质的影响,以宁波鄞州地区一种淤泥质黏土为试样,掺入不同量的硅灰,对硅灰加固土的力学性质和结构特征进行了测试。采用三轴不固结不排水剪切试验,测试分析了不同掺入量的硅灰加固土的应力应变关系,通过扫描电镜SEM照片分析了不同硅灰掺入量的硅灰加固土的结构特征。结果表明:(1)硅灰可以提高软土的黏聚力,黏聚力随着硅灰掺入量的增加而增大;(2)随着硅灰掺入量的增加,硅灰加固土的抗变形能力呈先增加后减小的趋势;(3)同一围压条件下,随着硅灰掺入量的增加,硅灰加固土的破坏偏应力逐渐增加;(4)随着硅灰掺入量的增加,硅灰加固土中大孔隙逐渐减少,小孔隙逐渐数量增加,孔径<1μm的小孔隙组分逐渐占优。
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| 关 键 词： | 硅灰 宁波软土 硅灰加固土 微观结构 抗剪强度 |
Experimental Study on Silica Fume Stabilized Soft Soil from Ningbo |
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| Wang Zeping,Wang Changming,Jiang Nan,Zhang Zaiheng.Experimental Study on Silica Fume Stabilized Soft Soil from Ningbo[J].Geotechnical Engineering Technique,2020(2):111-116,121. |
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| Authors: | Wang Zeping Wang Changming Jiang Nan Zhang Zaiheng |
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| Institution: | (College of Construction Engineering,Jilin University,Changchun 130021,Jilin,China;Ningbo Geotechnical Engineering Co.,Ltd.,Ningbo 315000,Zhejiang,China) |
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| Abstract: | In order to study the influence of silica fume on the mechanical properties of soft soil,silty clay samples from Yinzhou district,Ningbo were mixed with different amounts of silica fume to test the mechanical properties and structure characteristics.The relation between stress and strain of stabilized soil with different content of silica fume was tested by triaxial undrained tests,and the structural characteristics were analyzed by SEM.The results show that the silica fume can improve the cohesion of soft soil,and the cohesion increases with the addition of silica fume.With the increasing content of silica fume,the anti-deformation of silica fume stabilized soil increases at the beginning and then decreases,and the damage deviator stress of silica fume stabilized soil increases under the same confining pressure.Increasing content of silica fume leads to the decreasing number of the larger pores and the increasing number of the smaller pores in silica fume stabilized soil,and the proportion of pores dominated with diameter is less than 1μm dominated gradually. |
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| Keywords: | silica fume Ningbo soft soil silica fume stabilized soil microstructure shear strength |
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