砂类亚硫酸盐渍土盐胀率预报模型

Salt expansion rate prediction model of sandy sulfite saline soil

中国西北及中亚、西亚地区存在着广泛的砂类亚硫酸盐渍土,如何对其加以有效利用关系着本地区生态环境、经济和工程建设的健康发展。为了充分和有效地利用当地资源,明确路用砂类亚硫酸盐渍土的盐胀率预报模式及其盐胀五要素的影响权重,以细粒土质砂亚硫酸盐渍土为例,基于过5mm筛的易溶盐试验方法,依据二次正交回归设计原理安排试验和设置试验因素水平,通过25组盐胀试验,建立细粒土质砂亚硫酸盐渍土盐胀率回归方程;同时进行相关系数的方差分析,检验回归方程和回归系数的显著性,建立砂类亚硫酸盐渍土简化的盐胀率预报模型,并对简化的盐胀率预报模型所得计算值与实际测试值进行对比验证,并通过SPSS软件对所得数学模型开展逐步回归分析,确定砂类亚硫酸盐渍土盐胀率影响因素的权重关系。研究结果表明:砂类亚硫酸盐渍土盐胀率影响因素的权重为易溶盐(0.612)、荷载(0.12)、水(0.116)、易溶盐与水的交互作用(0.107)、易溶盐与荷载的交互作用(0.025)、水与荷载的交互作用(0.006);易溶盐含量对砂类亚硫酸盐渍土盐胀率的贡献量超过50%;上覆荷载对砂类亚硫酸盐渍土盐胀率的抑制作用不大;砂类亚硫酸盐渍土盐胀四要素中的交互作用主要体现在易溶盐与水之间和易溶盐与上覆荷载之间;研究结果可以为在砂类亚硫酸盐渍土地区进行工程设计与施工提供技术参考。

In northwest China,central Asia and west Asia,there is a large number of sandy sulfite saline soil.How to effectively use it relates to the healthy development of the ecological environment,economy and construction in these regions.In order to make full and effective use of the regional resources and clarify salt expansion rate prediction model and effect weight of salt expansion five elements for sandy sulfite saline soil,based on fine sandy sulfite saline soil and the soluble salt content experimental method of screening method of 5 mm,using quadratic regression orthogonal design to determine test factors level,through 25 groups of salt-heaving experiments,salt-heaving rate regressive equation was established.Then the equation and regression coefficients＇significance were verified by the analysis of variance.Moreover,thesimplified salt expansion rate prediction model of sandy sulfite saline soil was established.The calculated values were compared and verified with the actual values.The primary and secondary relations of affecting factors of sandy sulfite-saline soil salt-heaving rate were determined by SPSS stepwise regression analysis.The results show that the sensitive parameters of sandy sulfite saline soil effects on the salt heaving rate sequentially are salinity（0.612）,load（0.12）,water（0.116）,interaction of salinity and moisture（0.107）,interaction of salinity and load（0.025）,interaction of water and load（0.006）.The contribution of the soluble salt to the salt heaving rate of sandy sulfite saline soil is more than 50%.The overlying load is relatively little inhibitory effect on the salt expansion rate of sandy sulfite saline soil.The interaction of four factors of salt expansion for sandy sulfite saline soil is mainly reflected in the soluble salt and water,the soluble salt and the overlying load.The research results can provide technical reference for engineering design and construction in the sandy sulfite saline soil area.