换填覆重法处理砂类硫酸盐渍土地基的室内模拟试验

发布时间：2018-05-25 23:21

  本文选题：盐渍土地基处理 + 换填覆重法　； 参考：《岩土力学》2017年02期

【摘要】：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F_s和其通过反力装置直接作用于土样后产生的竖向应变Fe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。
[Abstract]:In order to realize the quantitative design of the sand sulfate soil foundation treated by the replacement method, the test instrument was designed and made according to the principle of the replacement loading method. The effects of temperature, salt content, moisture content and minimum void ratio on the expansion of sand sulphate soil samples were studied through laboratory simulation tests. The quantitative method for the design of replacement overburden cushion was discussed. It is found that the temperature sensitive range of the expansion of salinized soil is 0 ~ 2.5 鈩，

本文编号：1935040