一种饱和粉质黏土的热固结特性试验研究

Experimental study of thermal consolidation of a saturated silty clay

采用自行研制的温度控制固结试验装置对一种饱和粉质黏土的热固结特性进行室内试验。研究表明,在不同的有效固结压力作用下饱和试样的孔隙水压力变化趋势以及固结体应变变化趋势类似。在温度升高过程中,由温度导致的孔隙水压力不断增大,当温度达到设定温度时,试样内的孔隙水压力也达到峰值,而且随着有效固结压力的增大,孔隙水压力峰值似乎略有增大。此外,温度升高后的固结排水量远大于温度再降低后的吸水量,亦即经过升温和降温过程,试样总体产生明显的收缩变形。

The consolidation characteristics of a saturated silty clay under thermal loading are discussed. Test results show that, for various confining pressures, the evolution patterns of whether pore pressure or volumetric strain is similar. In the process of temperature rising, the pore pressure increases continually with elapsed time, and the pore pressure also reaches to a peak pore pressure （or a steady value） when the specimen is heated to a required higher temperature value. Furthermore, this peak pore pressure increases as the confining pressure increases. Besides, the consolidation volumetric strain （i.e., shrinkage deformation） by heating is greater than the volumetric strain （i.e., expansion deformation） by cooling; in other words, the specimen totally takes on a shrinkage effect after a complete process of heating and cooling.