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| 基于直剪试验的不同黏土力学特性研究 |
| Research on Mechanical Properties of Different Clay Based on Direct Shear Test |
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| DOI：10.16018/j.cnki.cn32-1650/n.202401006 |
| 中文关键词: 黏土 直剪试验 抗剪强度 含水率 黏聚力 |
| 英文关键词: clay direct shear test shear strength moisture content cohesion |
| 基金项目: |
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| 摘要点击次数: 49 |
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| 中文摘要: |
| 为了研究某桥所在地的地层土质状况，提取地层上的3种黏土(黑色黏土、黄色黏土和红色黏土)采用直剪试验进行力学特性研究。结果表明: 3种黏土的抗剪强度均随着法向应力的增大而增大，且随着法向应力的增加，3种土样的拱形剪切面越来越明显；在同一法向压力下，黄色黏土黏聚力最大，黑色黏土次之，红色黏土最小，在内摩擦角方面，黄色黏土与黑色黏土无太大区别，但都大于红色黏土；在土体含水率相同时，黄色黏土抗剪强度最大，黑色黏土次之，红色黏土最小，3种黏土的最佳含水率为13%；在最佳含水率下，当法向压力相同时，3种土样的剪应力均随剪切位移的增大而增大，在达到最大值后再逐渐下降并稳定在残余强度。 |
| 英文摘要: |
| In order to research the soil quality of the stratum where a bridge is located, the mechanical properties of three kinds of clay (black clay, yellow clay and red clay) extracted from the stratum were studied by direct shear test. The results show that the shear strength of three kinds of clay increases with the increase of normal stress, and the arch shear planes of the three soil samples become more and more obvious with the increase of normal stress. Under the same normal pressure, the cohesion of yellow clay is the highest, black clay is the second, and red clay is the smallest. In terms of internal friction angle, there is no significant difference between yellow clay and black clay, but they are all larger than red clay. When the soil moisture content is the same, the shear strength of yellow clay is the largest, followed by black clay, followed by red clay, and the best moisture content of the three kinds of clay is 13%. Under the optimum moisture content, when the normal pressure is the same, the shear stress of the three soil samples increases with the increase of shear displacement, and then gradually decreases and stabilizes in the residual strength after reaching the maximum value. |
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