论文部分内容阅读
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。
The existence of a wide range of sandy sulfite soils in northwestern China, Central Asia and West Asia and how to effectively use them have a bearing on the healthy development of ecological environment, economy and engineering construction in the region. In order to make full and effective use of local resources and clarify the prediction model of the salt expansion rate of road-boring sulfite soils and the influence weight of the five factors of salt bulking, taking the fine-grained sandy sulfite soils as an example, 5mm sieve of the soluble salt test method, according to the second-order orthogonal regression design principles to arrange the test and set the level of experimental factors, through 25 groups of salt expansion test, the establishment of fine grained sandy sulfite soil salt expansion rate regression equation; at the same time Analysis of variance of correlation coefficient, test the regression equation and significance of regression coefficient, and establish a simplified model of forecasting salt infiltration rate for sandy sulfite soil, and compare the calculated value with the actual test value Validation and SPSS software to carry out a stepwise regression analysis of the resulting mathematical model to determine the impact of salt content of sand sulfite salt expansion rate of the weight relationship. The results show that the weight of influencing factors of salinity swell rate of sandstone sulfite is easily soluble salt (0.612), load (0.12), water (0.116), soluble salt and water interaction (0.107), soluble Interaction between salt and load (0.025), interaction between water and load (0.006); soluble salt content contributes more than 50% of salinity swell rate of sandy sulfite soil; Salinized soil salt expansion rate of the role of inhibition is not big; sand sulphite saline soil four elements of the interaction is mainly reflected in the soluble salt and water between soluble salt and the overlying load; the results It can provide technical reference for engineering design and construction in sand sulfite soil area.