| 黏粒含量对黄土抗剪强度影响试验 |
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| 引用本文： | 王力,李喜安,洪勃,杜少少,张航泊,赵宁.黏粒含量对黄土抗剪强度影响试验[J].煤田地质与勘探,2019,47(3):179-185. |
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| 作者姓名： | 王力 李喜安 洪勃 杜少少 张航泊 赵宁 |
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| 作者单位： | 矿山地质灾害成灾机理与防控重点实验室;长安大学地质与测绘工程学院;国土资源部岩土工程开放研究实验室 |
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| 基金项目： | 国家自然科学基金项目（41572264）；矿山地质灾害成灾机理与防控重点实验室开放课题（2kf2017-17） |
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| 摘 要： | 开展不同黏粒含量对黄土抗剪强度影响的试验研究，揭示黏粒含量对抗剪强度的影响及其微观机理，为黄土地区的工程实践提供科学依据。通过自制负压湿筛装置筛取不同黏粒含量的黄土试样，采用静压法将不同黏粒含量的黄土试样制成同一干密度不同含水率试样进行直剪试验。研究表明:随着含水率的增长，不同黏粒含量试样黏聚力均表现为先增加后减小的变化规律，并在含水率14%附近达到最大值；内摩擦角则均呈单调下降的变化趋势。随黏粒含量的增长，不同含水率试样黏聚力呈增大趋势；内摩擦角呈先减小后增加的变化趋势。通过其微观结构可解释黏粒含量对黄土抗剪强度的影响机制。
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| 关 键 词： | 黏粒含量 含水率 抗剪强度 黏聚力 内摩擦角 微观结构 |
| 收稿时间： | 2018-06-17 |
Effect of clay content on shear strength of loess |
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| Abstract: | The experimental research about effect of different clay content on shear strength of loess was carried out to reveal the influence of clay content on shear strength and its microscopic mechanism, and then a scientific basis for engineering practice of loess was provided. Self-made wet sieve device under negative pressure was applied to screen loess samples with different clay content. Different clay content of the loess samples were made to the same dry density, but with different moisture content using static pressure method, and then were taken direct shear test. The results show that with the increase of moisture content, the cohesion of samples with different clay content firstly increased and then decreased, and reached the maximum near 14%, while the friction angle showed a monotonic downward trend. With the increase of clay content, the cohesion showed a rising trend, while the friction angle first decreased and then increased. The effect of clay content on shear strength of loess can be explained by its microstructure. |
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