| 粗粒土剪胀性大型三轴试验研究 |
| |
| 引用本文： | 姜景山,程展林,左永振,丁红顺.粗粒土剪胀性大型三轴试验研究[J].岩土力学,2014,35(11):3129-3138. |
| |
| 作者姓名： | 姜景山 程展林 左永振 丁红顺 |
| |
| 作者单位： | 1.南京工程学院 建筑工程学院，南京 211167；2.长江科学院 水利部岩土力学与工程重点实验室，武汉 430010 |
| |
| 基金项目： | 长江科学院开放研究基金资助项目(No. CKWV2013205/KY）；南京工程学院校级科研基金项目资助(No. YKJ201330）。 |
| |
| 摘 要： | 剪胀性是土体显著区别于一般弹性材料的基本特性，与土体的强度和变形特性密切相关。通过4组不同初始密度的塔城砂砾石常规大型三轴试验，研究剪胀性对粗粒土强度和变形特性的影响。试验结果表明，（1）若体变速率（体变和轴向应变均以压缩为正）先从正值减小到负值并达到最小值，随后又有所增大但仍小于0，则应力-应变曲线为软化型，在比值为最小值时土体剪胀性最大，对应于峰值强度，若体变速率从某一正值单调减小并一直大于0，则应力-应变曲线为硬化型；（2）体变变化趋势取决于剪胀性和压缩性的大小，剪切后期若剪胀速率大于压缩速率，则体变先压缩后膨胀，应力-应变曲线呈软化型，反之若剪胀速率小于压缩速率，则体变一直是压缩的，应力-应变曲线呈硬化型。研究结果对于加深认识粗粒土的强度和变形特性具有重要意义。
|
| 关 键 词： | 粗粒土 三轴试验 应力-应变关系 剪胀性 强度 变形 Rowe剪胀方程 |
| 收稿时间： | 2013-10-13 |
Dilatancy of coarse-grained soil in large-scale triaxial tests study |
| |
| JIANG Jing-shan,CHENG Zhan-lin,ZUO Yong-zhen,DING Hong-shun.Dilatancy of coarse-grained soil in large-scale triaxial tests study[J].Rock and Soil Mechanics,2014,35(11):3129-3138. |
| |
| Authors: | JIANG Jing-shan CHENG Zhan-lin ZUO Yong-zhen DING Hong-shun |
| |
| Institution: | 1. School of Civil Engineering, Nanjing Institute of Technology, Nanjing 211167, China;
2. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources,
Yangtze River Scientific Research Institute, Wuhan 430010, China |
| |
| Abstract: | Dilatancy is a basic behavior of soils which is closely related to strength and deformation behaviors of soils and makes soils significantly different from normal elastic materials. Four groups of large-scale triaxial tests were conducted to investigate the influence of dilatancy on strength and deformation behaviors of coarse-grained soils at different initial densities. The test results show that: (1) The stress-strain curve shows softening behavior if volumetric strain rate (the ratio of volumetric strain increment to axial strain increment, assume positive for volumetric strain and axial strain under compressed condition) firstly decreases from a positive value to a negative value and then increases but still smaller than zero; the dilatancy and strength of the soil reach maximum at the minimum value of the ratio, otherwise the stress-strain curve behaves as hardening behavior if the ratio of volumetric strain increment to axial strain increment decreases monotonously from a positive value but always larger than zero. (2) The variation trend of volumetric strain depends on dilatancy and compressibility of soils; the volumetric strain is firstly compressive and then dilatant and stress-strain curve behaves as stress softening form if dilatancy rate (the negative of the ratio of volumetric strain increment caused by shear stress to axial strain increment) is larger than compression rate (the ratio of volumetric strain increment caused by compression stress to axial strain increment) in the late shear stage; otherwise the volumetric strain is always compressive and the stress-strain curve behaves as hardening behavior for the condition that dilatancy rate is smaller than compression rate in the whole shear stage. It is of great importance to know the dilatancy of coarse-grained soils for insight into the strength and deformation behaviors of coarse-grained soils. |
| |
| Keywords: | coarse-grained soil triaxial test stress-strain relation dilatancy strength deformation Rowe dilatancy equation |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
