...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Canadian Geotechnical Journal >Permanent deformation characteristics of saturated sand under cyclic loading
【24h】

Permanent deformation characteristics of saturated sand under cyclic loading

机译：循环荷载下饱和砂土的永久变形特征

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The loading path involving principal stress rotation (PSR) during shear is an important phenomenon encountered in many field conditions. Typically for traffic loading, both the magnitude and direction of principal stresses may vary with time due to the motion of vehicles, and the stress path can be mimicked by a heart shape in the deviatoric stress space. Conventional triaxial tests are not suitable to recreate this type of stress path in that no torsional shear stress can be applied on the test samples. To overcome this limitation, a series of tests using a hollow cylinder apparatus were conducted on sand to investigate the permanent deformation characteristics under drained conditions with different levels of confining pressure (sigma(c)), cyclic vertical stress ratio (CVSR), and cyclic torsional stress ratio (eta). The results clearly show an increase in the permanent deformation with eta, indicating that the PSR effect on permanent deformation cannot be ignored. Both sigma(c) and CVSR were found to also affect permanent deformation, which was more pronounced when PSR was coupled into the test. A five-parameter formulation that accounted for the effect of confining pressure, deviatoric stress, torsional shear stress, and number of loading cycles was subsequently established to analyze the permanent strain. The formulation coefficients were first determined and then used to explain the effects of stress variables on the permanent deformation. Validation studies were performed to address the adequacy of the formulation to predict permanent deformation.
机译：在剪切过程中涉及主应力旋转（PSR）的加载路径是许多现场条件下遇到的重要现象。通常，对于交通负荷，主应力的大小和方向都可能由于车辆的运动而随时间变化，并且应力路径可以通过偏应力空间中的心形来模仿。传统的三轴测试不适用于重现此类应力路径，因为不能在测试样品上施加扭剪应力。为了克服这一限制，使用中空圆柱体设备对沙子进行了一系列测试，以研究在排水条件下具有不同水平的围压（sigma（c）），循环垂直应力比（CVSR）和循环的永久变形特性。扭转应力比（η）。结果清楚地表明，永久变形随eta的增加而增加，表明PSR对永久变形的影响不容忽视。发现sigma（c）和CVSR也会影响永久变形，当将PSR耦合到测试中时，这种变形更为明显。随后建立了一个五参数公式，该公式考虑了围压，偏应力，扭剪应力和荷载循环次数的影响，以分析永久应变。首先确定公式系数，然后将其用于解释应力变量对永久变形的影响。进行了验证研究，以解决配方中预测永久变形的适当性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号