持续蒸发作用下膨胀土裂隙和湿热特性室内模型试验

发布时间：2018-05-14 06:13

  本文选题：膨胀土 + 裂隙　； 参考：《岩土力学》2014年S1期

【摘要】：以广西白色强膨胀土为研究对象,对有、无植被覆盖和农膜覆盖的膨胀土分别进行30 d持续蒸发试验,研究持续蒸发过程对膨胀土湿热和裂隙拓展特性的影响。结果表明,无植被覆盖时表层土体脱湿量及脱湿速率分别为7.38%和0.17%/d,植被覆盖时分别为5.29%和0.07%/d,显然植被覆盖的脱湿量和脱湿速率均小于无植被覆盖的,而农膜覆盖土体蒸发受到遏制,水分无散失;无植被覆盖和农膜覆盖土体平均温度变化分别是7.36℃和9.72℃,比植被覆盖的2.03℃大5~8℃,可见植被覆盖降低了土体温度变化幅度;无植被覆盖土体裂隙深度达32 cm,与湿热影响深度28 cm较接近;植被覆盖和农膜覆盖土体平面及竖向均无出现明显裂隙,植被覆盖和蒸发受到遏制的状态可阻止土体裂隙开展。
[Abstract]:Taking the white strong expansive soil in Guangxi as the research object, the continuous evaporation experiments were carried out for 30 days on the expansive soil without vegetation and agricultural film, respectively, to study the effect of the continuous evaporation process on the hygrothermal and fracture expansion characteristics of the expansive soil. The results showed that the dehumidification rate and dehumidification rate of surface soil were 7.38% and 0.17% / d, respectively, and 5.29% and 0.07 / d of vegetation coverage, respectively. It was obvious that the dehumidification rate and dehumidification rate of vegetation cover were lower than those without vegetation coverage. But the evaporation of the soil covered by agricultural film was restrained, and the soil moisture was not lost, the average temperature of the soil covered with no vegetation and agricultural film was 7.36 鈩，

本文编号：1886669