温控渗透固结试验装置及试验研究

近年来，通过热塑料排水板加速软土固结的软基处理方法已经得到了工程应用。土体渗透系数和压缩系数具有温度敏感性，也是决定热排水固结设计计算准确性的关键参数，但相关试验仪器并不多见。本文介绍一种用于测定饱和软土在不同温度下的渗透系数和压缩系数的试验装置。该试验装置可控制土样温度在室温至80℃范围内变化，同时可施加12．5～1600kPa的固结压力。采用该装置对五组饱和软土在不同温度下进行渗透和压缩固结试验。同一组土样进行两种试验，以减小试验误差。试验结果表明随温度的升高渗透系数会明显增大，但压缩系数基本不受温度的影响。

Temperature controlled device for permeability and consolidation testing and its application

Abstract： Thermal prefabricated vertical drains （PVDs） have been widely used to accelerate the consolidation of soft soil in engineering in recent years. The permeability coefficient and compression coefficient of soft soil are temperature-sensitive, and they are the key parameters of the design with thermal consolidation method. However, few related devices are accessible. The testing device for the determination of the permeability and compressibility parameters of the saturated clay under different temperature conditions is introduced. The temperature of soft soil can be controlled within the range from the room temperature to 80℃ , while the consolidation pressures from 12.5 to 1600kPa can be applied. The permeability coefficient and compressibility coefficient of the saturated clay were determined under five different temperature conditions by using the self-refitted instrument. In order to reduce the testing error, two parallel tests were conducted as a set. It is shown that permeability coefficient increases dramatically as temperature rises, but compressibility coefficient is not influenced by temperature.