新疆奎克地区硫酸盐渍土溶陷特性研究

Melting Characteristics of Sulfuric Saline Soil in Kuike Region of Xinjiang

采用低速台式自动平衡离心机,对新疆奎屯-克拉玛依高速公路路基填料的天然盐渍土进行室内离心模拟试验,探讨了含盐量、温度及离心力对该地区硫酸盐渍土溶陷变形的影响。研究结果表明：硫酸盐渍土的溶陷系数均随着离心加速度的增加而增加,与含盐量无关；当离心力小于300kPa时,溶陷系数最敏感；当SO42-含量为2%时,对盐渍土的溶陷变形影响最大。通过非线性回归正交分析方法对5种工况试验数据进行分析,得出不同含盐量、不同温度的f～δ拟合公式,发现当离心力为300kPa时,温度的变化对该地区的天然盐渍土的溶陷系数影响不大。研究成果可为类似盐渍土地区进行公路工程的设计与施工提供参考。

The low-speed table automatic balance centrifugewas used to perform the laboratory centrifuge simulation on the natural saline soil of the roadbed filling of Kuitun-Kelamayi highway of Xinjiang and to investigate the impacts of sanity content,temperature,and centrifugal force on the melting deformation of sulfuric saline soil,The research result showed that（1）the melting coefficient of sulfuric saline soil increases with the increasing of centrifugal acceleration speed,and is unrelated to sanity content;（2）the melting coefficient is most sensitive when the centrifugal force is less than 300kPa;and（3）the melting deformation is biggest when SO42-content is 2%,The nonlinear regression orthogonal analysis method was used to analyze the test data under five working conditions and to obtain the f～δfitting formula of different sanity contents and temperatures,It suggested that the variation of temperature has insignificant impacts on the melting coefficient of natural saline soil when the centrifugal force is 300kPa,The research results can provide reference for the design and construction of highway engineering in the similar saline soil area.