添加秸稈后黑土力學(xué)行為特征——秸稈含量的影響
發(fā)布時間：2019-01-05 13:40
【摘要】：為探明秸稈還田量對黑土力學(xué)特性的影響,以典型黑土區(qū)未經(jīng)開墾(高有機(jī)質(zhì)低黏粒含量)以及耕作40年(低有機(jī)質(zhì)高黏粒含量)的土壤為研究對象,在秸稈長度為15 mm條件下,采用室內(nèi)固結(jié)和三軸剪切相結(jié)合的方法,通過壓縮指數(shù)、回彈指數(shù)、黏聚力及內(nèi)摩擦角的測定與分析,模擬研究了黑土壓縮-回彈及抗剪切行為對不同小麥秸稈還田比例(0%、25%、50%、75%、100%)的響應(yīng)規(guī)律.結(jié)果表明:添加秸稈后黑土力學(xué)性能明顯改善,以開墾多年有機(jī)質(zhì)含量低的黑土改善效果更為顯著.秸稈全量還田時,最不易被壓縮且壓實后恢復(fù)能力最強(qiáng);秸稈50%還田時,土體抗剪強(qiáng)度最大;當(dāng)秸稈還田比例為50%~100%時,黑土抗壓與抗蝕效果較好.
[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.
【作者單位】： 東北林業(yè)大學(xué)林學(xué)院;東北林業(yè)大學(xué)土木工程學(xué)院;
【基金】：國家自然科學(xué)基金項目(41302222,41271293)資助~~
【分類號】：S141.4
本文編號：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.
【作者單位】： 東北林業(yè)大學(xué)林學(xué)院;東北林業(yè)大學(xué)土木工程學(xué)院;
【基金】：國家自然科學(xué)基金項目(41302222,41271293)資助~~
【分類號】：S141.4
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