公路黄土湿化模型研究

• 作 者: 宋国林
• 机 构: 内蒙古路桥有限责任公司,
• 出 处: 公路交通科技(应用技术版)
• 发表日期: 2017年10期
• 关键词: 湿化 原状黄土 模型 湿陷变形 非饱和土 体积应变 压缩条件 围压 原状土 下偏差

土的湿化变形是一种塑性变形,用塑性理论能合理的描述它。土由天然同干状态遇水饱和时会发生显著的变形,这称为土的湿化变形或湿陷变形。各围压力下偏差应力和轴向应变的关系近似于双曲线,故采用Duncan-Chang模型求其参数。等向压缩条件下非饱和原状黄土与饱和原状黄土的体积应变相差不多,说明此原状土的湿化不明显。各种围压下湿化轴向应变总是随着湿化应力差的增加而增加。

Wet soil deformation is a plastic deformation, plastic theory can reasonably describe it. Soil from natural dry state with water saturation occurs significant deformation, which is called the wet soil deformation or collapse deformation. The relationship between deviatoric stress and axial strain in each surrounding pressure is similar to a hyperbola, so the parameters are calculated by Duncan-Chang model. Under the isotropic compression, the volumetric strain of unsaturated undisturbed loess and saturated undisturbed loess is about the same, indicating that the wettability of this undisturbed soil is not obvious. The axial strain at various confining pressures is always increasing with the increase of wetting stress.