红土湿化变形与浸水时间相关性研究

Correlation study of wetting deformation of laterite and soaking time

本文以江西红土为研究对象,采用"单线法"在改进后的应变控制式三轴仪中分别进行红土的干样和湿样湿化变形试验。试验结果表明:相同偏应力水平下浸水吸湿,土样在高围压下产生的湿化变形比低围压下大些;土样在相同的围压下,偏应力水平较大的情况下浸水吸湿产生的湿化变形量比偏应力水平较低时大;在偏应力水平较低时浸水湿化,土样开始阶段产生的湿化体积应变增加较快,后期逐渐变缓;在偏应力水平较高时浸水湿化,土样产生湿化体积应变速率一直都比较大;并推导得出湿化产生的轴向应变与时间相关性公式。

In this paper, the laterite of Jiangxi is taken as the object of study, and using "single line method", the dry and wet deformation tests of laterite are carried out in the improved strain-controlled triaxial test apparatus respectively. The experimental results show that with the same deviatoric stress level of water moisture, the wetting deformation of soil samples under high confining pressure is more obvious than under low confining pressure. For the same confining pressure, the wetting deformation of soil samples under large deviatoric stress level is bigger than low deviatoric stress level. Under low deviatoric stress level, the wetting volumetric strain increases rapidly at the beginning, then gradually slow down in later stage; Under high deviatoric stress level, the wetting volumetric strain increases rapidly all the time. The correlation formula of axial strain and time is derived.