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为了充分发挥砾类亚硫酸盐渍土的路用工程价值,以盐胀控制要素为研究切入点,开展单因素盐胀试验;并以其试验结果为基础,通过正交设计方法开展多因素交互作用下的砾类亚硫酸盐渍土的盐胀试验,建立盐胀率简化预测模型;采用SPSS软件对显著性影响因素开展逐步回归分析,明确砾类亚硫酸盐渍土的盐胀敏感参数。研究结果表明:在最佳含水率和压实度93%的工况下,砾类亚硫酸盐渍土起胀含盐量为0.5%,破坏含盐量为2.6%;盐胀率随含水率的变化规律会因含盐量的增加而产生改变;盐胀率与初始干密度正相关,与附加荷载负相关;盐胀要素对盐胀率的影响按权重大小排序依次为易溶盐含量(0.379)、含水率(0.243)、易溶盐含量与含水率的交互作用(0.166)、附加荷载(0.151)。
In order to give full play to the engineering value of gravel-like sulfite soil for road use, the control factor of salt expansion was taken as a starting point to carry out the single factor salt expansion test. Based on the test results, the orthogonal design method was used to carry out multi-factor interaction And the simplified prediction model of the salt expansion was established. The regression analysis was made on the significant influence factors by using SPSS software, and the salt expansion sensitivity parameters of the gravelly sulfite soil were determined. The results show that under the optimum moisture content and compaction degree of 93%, the salt content of gravelly sulphite saline soils is 0.5% and the salt content is 2.6% The change law of salt expansion rate was changed due to the increase of salinity. The salt expansion rate was positively correlated with initial dry density and negatively correlated with additional load. The influence of salt expansion factors on salt expansion rate was orderly soluble salt content 0.379), water content (0.243), the interaction between soluble salt content and water content (0.166), additional load (0.151).