三轴应力状态下砂砾料浸水变形特性试验研究

利用VJ非饱和三轴仪对砂砾石料进行了各向等压和剪切状态下浸水变形特性试验研究,并对不同应力状态下浸水变形过程中体应变和偏应变增量进行统计分析。假定体积应变增量在试样各向同性和等压固结条件下可分解成两部分,一部分是由于围压σ3引起的,另一部分是由于偏应力引起的;偏应变仅由偏应力引起的。在此假定的基础上建议了一个浸水体应变增量和偏应变增量与应力水平和围压之间的经验表达式以及相应的参数整理方法。

Test Study on Wetting Deformation of Gravel Sand under Triaxial Stress State

The VJ unsaturated triaxial apparatus is used for soaking tests.The tests are performed under the isotropic compression and triaxial compression conditions with soaking deformation occurred.The volumetric and deviatoric strain increments are analyzed during soaking deformation under various stress states.It is assumed that the volumetric strain increment could be decomposed into two parts,i.e.,one part from confining pressure σ3 and the other from deviator stress;and the deviatoric strain is only induced by the deviator stress.Based on this assumption,an empirical formula is proposed for the relationship between the volumetric and deviatoric strain increments and the stress levels and confining pressure,and the corresponding method is also given for parameter determination.