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张玉伟,宋战平, 翁效林.Q3原状黄土与重塑黄土的土水特性研究水资源与水工程学报[J].,2019,30(3):224-219
Q3原状黄土与重塑黄土的土水特性研究
Study on soil water characteristic curve of Q3 intact and remolded loess
  
DOI:10.11705/j.issn.1672-643X.2019.03.35
中文关键词:  原状黄土  重塑黄土  压力膜仪  土水特性  进气值
英文关键词:intact loess  remolded loess  pressure membrane gauge  soil-water characteristic  air entry value
基金项目:国家自然科学基金项目(51378004、51578447); 西安建筑科技大学人才基金(RC1803); 中国博士后基金项目(2018M643809XB)
作者单位
张玉伟1,宋战平1, 翁效林2 (1.西安建筑科技大学 土木工程学院 陕西 西安710055 2.长安大学 公路学院 陕西 西安 710064) 
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中文摘要:
      黄土土水特征曲线与其强度、渗流及本构关系等密切相关。为研究Q3黄土的土水特性,分别进行了Q3原状黄土和重塑黄土的土水特征曲线测试,并用经典的B-C模型和V-G模型对试验结果进行拟合,分析孔隙比对Q3重塑黄土土水特性的影响。结果表明:原状黄土土水特征曲线分为快速减小、缓慢减小和稳定3个阶段,进气值为20kPa左右,随土体排水,空气进入孔隙内部,吸力逐渐增大,稳定阶段土体饱和度很低,土体处于大吸力段,孔隙排水不明显;重塑黄土土水特征曲线整体趋势与原状黄土一致,但孔隙比对其影响较明显,当孔隙比较大时,体积含水率降低引起吸力明显增加,进气值较小,孔隙比较小时,随着吸力值增加,体积含水率降低速率较小,随着孔隙比减小,土体进气吸力值逐渐增大;采用B-C模型和V-G模型与原状黄土试验结果进行对比,B-C模型低吸力段拟合效果不佳,高吸力段拟合较好,V-G模型整体拟合效果良好。
英文摘要:
      Soil water characteristic curve of loess is closely related to its strength, seepage and constitutive simulation. This study tested soil water characteristic curves of intact and remolded Q3 loess. The classical B-C model and V-G model were used to fit the test results, and the effect of void ratio to soil water characteristic curve of Q3 remolded loess was analyzed. The results showed that soil water characteristic curve of intact loess is divided into three stages: the rapid decreasing stage, the slow decrease stage and the stable stage. When air suction value was about 20 kPa, air began to fill into the pore with the internal soil with drainage, and air suction increases gradually, stable stage of soil saturation is very low, the soil in the large suction pore drainage is not obvious. The overall trend of remolded loess consistent with the curves of intact loess, but the effect of void ratio on the soil water characteristic curve is larger, when the pore is relatively large, the initial volume of high water content, low suction volume water content decreased significantly with increasing suction, the pore is small, relatively small volume of the initial moisture content, with suction value increases, volumetric water content decrease rate is smaller; by using the B-C model and the V-G model of intact loess and experimental results were compared, results in low suction B-C model and difference test. However, the B-C model of high suction section is in good agreement with the experimental results. The overall fitting effect of V-G model is good. Especially in the low suction section, the fitting effect is better than the B-C model.
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