| 摘要: |
| 利用应变控制式土梁挠曲仪 ,对东北黑土、西北黄土、华南红土等几种粘性土的 2 0 0多组试验土样进行了土梁极限拉应变试验 .划分了土梁挠曲试验应变特征的四个阶段 ,以及确定极限拉应变的方法 ,讨论了土的竖向挠曲变形速率、含水量和干重度对极限拉应变的影响 ,指出在试验控制条件下 ,极限拉应的变化范围在 1‰～ 3‰之间 . |
| 关键词: 应变控制,土梁,挠曲试验,极限拉应变 |
| DOI： |
| 分类号:TU411 |
| 基金项目: |
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| Experimental study on limit tensile strain under bending of compacted soil |
|
LI Lei,RONG Wei-dong
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| Abstract: |
| On the basis of the research on the behavior of tensile strain stress relationship of compacted soil in the past few decades, a new strain controlled soil beam bending instrument was invented,and more than 200 compacted soil samples including loess soil from northwest, black soil from northeast, red soil from southwest of China were tested by the new device. Through the experimental study on the compacted soil sample, the strain process of the soil sample is divided into four phases and the method to gain the limit value of tensile strain under bending was given in this paper.The effect of strain rate, the water content and the dry unit weight are also considered,besides, the range of the limit value of tensile strain under bending is obtained in the paper. |
| Key words: strain controll,soil beam,bending test,limit tensile strain, |
