基于响应面法的砂姜黑土抗压强度研究

Research on Compressive Strength of Shajiang Black Soil Based on Response Surface Methodology

以砂姜黑土为试材,采用响应面法,研究了泥炭、沙子和过磷酸钙3种土壤改良剂对土壤抗压强度的影响,分析了土壤抗压强度与土壤理化性状的关系,以期为砂姜黑土地区土壤改良提供参考依据。结果表明:改良剂对降低土壤抗压强度影响效应的主次顺序为泥炭>沙子>过磷酸钙,沙子和过磷酸钙的交互作用显著。抗压强度与黏粒含量呈极显著正相关,与容重呈显著正相关;与砂粒和有机质含量呈极显著负相关,与孔隙度呈显著负相关。根据Design Expert 12给出的最优组合,即泥炭77.72 g·kg^(-1),沙子61.91 g·kg^(-1),过磷酸钙2.63 g·kg^(-1)的添加量时,有效改良了土壤理化性状(容重,(1.24±0.03)g·cm^(-3);孔隙度,53.01%±2.36%;黏粒,24.8%±0.64%;粉砂粒,38.37%±1.22%;砂粒,36.83%±1.51%),此时土壤的抗压强度最低266.67 kPa,比对照砂姜黑土的抗压强度降低了53.62%,有效降低土壤抗压强度后具有良好的整地作业效果。

Taking shajiang black soil as the test material,the effect of peat,sand,and superphosphate as soil amendments on soil compressive strength was studied by response surface methodology,the relationship between soil compressive strength and soil physicochemical properties was analyzed,in order to provide reference for soil amelioration in the shajiang black soil area.The results showed that the primary and secondary order of the effect of amendments on reducing soil compressive strength was peat>sand>superphosphate,and the compressive strength was highly significantly positively correlated with the clay content and significantly positively correlated with the unit weight.There was a highly significant negative correlation with sand and the content of organic matter,and a significant negative correlation with porosity.According to the optimal solution provided by Design Expert 12,the addition of peat 77.72 g·kg^(-1),sand 61.91 g·kg^(-1),and superphosphate 2.63 g·kg^(-1) effectively improved the soil physical and chemical properties(bulk density,(1.24±0.03)g·cm^(-3);porosity,53.01%±2.36%;clay,24.8%±0.64%;silty sand,38.37%±1.22%;grit,36.83%±1.51%).In the end,the minimum compressive strength of the soil was 266.67 kPa,which was 53.62%lower than the compressive strength of the control treatment.There was a excellent effect on land preparation after effectively reducing the soil compressive.