Impact of Drainage Conditions on the Thermal Volume Change of Soft Clay
Impact of Drainage Conditions on the Thermal Volume Change of Soft Clay
复制标题
排水条件对软粘土热体积变化的影响
DOI：
10.1061/9780784480137.004
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发表时间：
2016
影响因子：
--
通讯作者：
T. Katsumi
中科院分区：
文献类型：
--
作者：
A. Takai;I. Ghaaowd;J. McCartney;T. Katsumi
本研究的重点是评价正常固结高岭土在不排水和排水条件下的热体积变化。在任一条件下的测试中，粘土样品在改进的三轴测试装置中从室温(23°C)加热到大约60°C，然后冷却。在这两个试验中，粘土样品的热体积变化都是通过图像分析来推断的。加热过程中，未排水试件发生弹性膨胀，排水试件出现塑性收缩。在未排水试件中测得的热致超孔隙水压力与力学模型的预测值吻合得很好。然而，利用未排水试件中测量的孔压预测排水试件的热体积变化表明预测不足，这可能是由于分析中使用的特定参数，以及热加速蠕变可能叠加在热固结之上的可能性。
: This study focuses on an evaluation of the thermal volume change of normally-consolidated Kaolinite clay under both undrained and drained conditions. For the tests under either condition, clay specimens were heated in a modified triaxial test setup from room temperature (23 °C) to approximately 60 °C then subsequently cooled. In both tests, the thermal volume change of the clay specimen was inferred using image analysis. During heating, elastic expansion was observed for the undrained specimen while plastic contraction was observed for the drained specimen. The thermally-induced excess pore water pressures measured in the undrained specimen compared well with predicted values from a mechanistic model. However, the thermal volume change of the drained specimen predicted using the pore water pressures measured in the undrained specimen indicated an under-prediction, possibly due to the particular parameters used in the analysis as well as the possibility that thermally-accelerated creep may be superimposed atop thermal consolidation.