离子土壤固化剂改性膨胀土冻融过程中水分迁移试验研究

Water Migration in Expansive Soil Modified by Ionic Soil Stabilizer under Cyclic Freezing and Thawing

为研究离子土壤固化剂在冻融过程中对膨胀土的影响,采用高低温冻融循环试验箱、DT85G数据采集器和电阻式温度传感器组成一套室内水分迁移试验装置,在一定的试样几何尺寸和外界试验条件下展开离子土壤固化剂加固前后膨胀土水分迁移过程的试验研究。通过测定试验前后膨胀土试样不同位置处含水率、干密度、孔隙率,同时记录该过程中试样不同位置处温度随时间的变化,分析冻融过程中离子土壤固化剂对膨胀土的加固作用。试验结果表明,经离子土壤固化剂加固后的膨胀土在冻融过程中土体温度变化较为缓慢,不同位置处的土壤含水率变化较小,孔隙率较小,整体稳定性较高。

A set of indoor test devices for water migration in expansive soil is employed to investigate into the influence of ionic soil stabilizer(ISS)on expansive soil under cyclic freezing and thawing.The test apparatus is composed of freeze-thaw cycle test box,DT85G data collector,and a resistance temperature sensor.The performance of ISS reinforcement on expansive soil after freeze-thaw cycle is analyzed by examining the physical parameters(water content,dry density,and porosity)and the temperature variation of samples at different heights.Results demonstrate that the temperature in expansive soil reinforced by ISS during freeze-thaw cycles changes slowly;in the meantime,water content changes little and porosity is small,indicating a high stability of samples.