为实现换填覆重法处理砂类硫酸盐渍土地基的量化设计，依据换填覆重法的原理设计并制作了试验仪器。通过室内模拟试验，研究了温度、含盐量、含水率、最小孔隙比等因素对砂类硫酸盐渍土试样膨胀的影响规律，探讨了换填覆重垫层设计的量化方法。研究发现，盐渍土膨胀的温度敏感区间是0～2.5 ℃， 5 ℃后试样只发生微小的膨胀变形；并不是最小孔隙比越小，砂类硫酸盐渍土试样的膨胀现象就越明显；含水率和含盐量对盐渍土试样膨胀变形的影响具有耦合作用；试样胀力增长率与体积膨胀应变呈现出很好的反相关性，冻-膨胀应力 和其通过反力装置直接作用于土样后产生的竖向应变 呈线性关系，线性系数与换填土厚度有关。其探索性试验仪器和方法对实际工程设计具有一定的参考价值。

A new kind of test equipment was designed and manufactured to testify the principle of heavy cover replacement technique for foundation treatment of coarse sulphate saline soil. Indoor tests examined the effects of temperature, salt content and water content, minimum void ratio on expensive behaviour of coarse sulphate saline soil and validated the heavy cover replacement technique. The study shows that the deformation of coarse sulphate saline soil is temperature sensitive in the range of 0 ℃ to 2.5 ℃, and the expansibility of sample is subtle during the cooling process below -5 ℃. The swelling phenomenon is found less prominent as the void ratio decreases. Both water content and salt concentration affect on expansion of saline sample. The rate of swelling pressure change decreases as the expansive strain increases. The expansive stress and vertical strain show a linear relationship. The linear coefficient depends on the depth of replaced soil. The exploratory testing equipment and method provide engineering implications for the practical design.