添加秸秆后黑土力学行为特征——秸秆含量的影响
发布时间：2019-01-05 13:40
【摘要】：为探明秸秆还田量对黑土力学特性的影响,以典型黑土区未经开垦(高有机质低黏粒含量)以及耕作40年(低有机质高黏粒含量)的土壤为研究对象,在秸秆长度为15 mm条件下,采用室内固结和三轴剪切相结合的方法,通过压缩指数、回弹指数、黏聚力及内摩擦角的测定与分析,模拟研究了黑土压缩-回弹及抗剪切行为对不同小麦秸秆还田比例(0%、25%、50%、75%、100%)的响应规律.结果表明:添加秸秆后黑土力学性能明显改善,以开垦多年有机质含量低的黑土改善效果更为显著.秸秆全量还田时,最不易被压缩且压实后恢复能力最强;秸秆50%还田时,土体抗剪强度最大;当秸秆还田比例为50%~100%时,黑土抗压与抗蚀效果较好.
[Abstract]:In order to find out the effect of straw returning amount on the mechanical properties of black soil, the uncultivated (high organic matter, low clay content) and 40 years tillage (low organic matter and high clay content) soils in typical black soil areas were studied. Under the condition of 15 mm straw length, the method of indoor consolidation and triaxial shear was used to measure and analyze the compression index, springback index, cohesion force and internal friction angle. The responses of compressive rebound and shear behavior of black soil to different proportion of wheat straw returning to the field (0 ~ 25) and 100% (50 ~ 75 ~ 75 ~ 100%) were studied in this paper. The results showed that the mechanical properties of black soil were obviously improved after adding straw, and the improvement effect of black soil with low organic matter content for many years was more obvious. When the straw was returned to the field in full quantity, the recovery ability of the soil was the most difficult to be compressed and compacted; when the straw returned to the field, the shear strength of the soil was the greatest; when the straw returned to the field was 50 ~ 100, the black soil had better anti-pressure and anti-corrosion effect.
【作者单位】： 东北林业大学林学院;东北林业大学土木工程学院;
【基金】：国家自然科学基金项目(41302222,41271293)资助~~
【分类号】：S141.4
本文编号：2401845
[Abstract]:In order to find out the effect of straw returning amount on the mechanical properties of black soil, the uncultivated (high organic matter, low clay content) and 40 years tillage (low organic matter and high clay content) soils in typical black soil areas were studied. Under the condition of 15 mm straw length, the method of indoor consolidation and triaxial shear was used to measure and analyze the compression index, springback index, cohesion force and internal friction angle. The responses of compressive rebound and shear behavior of black soil to different proportion of wheat straw returning to the field (0 ~ 25) and 100% (50 ~ 75 ~ 75 ~ 100%) were studied in this paper. The results showed that the mechanical properties of black soil were obviously improved after adding straw, and the improvement effect of black soil with low organic matter content for many years was more obvious. When the straw was returned to the field in full quantity, the recovery ability of the soil was the most difficult to be compressed and compacted; when the straw returned to the field, the shear strength of the soil was the greatest; when the straw returned to the field was 50 ~ 100, the black soil had better anti-pressure and anti-corrosion effect.
【作者单位】： 东北林业大学林学院;东北林业大学土木工程学院;
【基金】：国家自然科学基金项目(41302222,41271293)资助~~
【分类号】：S141.4
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