發(fā)布時(shí)間：2018-05-11 22:35

  本文選題：膨脹土 + 裂隙��； 參考：《巖土力學(xué)》2014年09期

【摘要】：以廣西白色強(qiáng)膨脹土為研究對(duì)象,對(duì)有、無(wú)植被覆蓋的膨脹土樣進(jìn)行蒸發(fā)、降雨再蒸發(fā)試驗(yàn),研究降雨、蒸發(fā)過(guò)程對(duì)膨脹土濕熱和裂隙拓展特性的影響。結(jié)果表明,植被覆蓋土樣表面的反射量比無(wú)植被覆蓋土樣小100W/m2左右,土樣表面溫差小5~6℃。無(wú)植被覆蓋土樣經(jīng)歷降雨過(guò)程后,在相同蒸發(fā)條件下,土樣表面裂隙率由1.28%增加到3.82%,表層土體累計(jì)脫濕量由3.42%增加到11.17%,脫濕速率由0.59%/d增加到1.44%/d,表層土體溫度變化平均值由13.1℃增加到14.9℃。可見(jiàn),降雨、蒸發(fā)過(guò)程使得土體水量變化加大,水分遷移速率增加,溫度變化加劇,土體趨于破碎。植被覆蓋土樣經(jīng)歷降雨過(guò)程后,在相同蒸發(fā)條件下,土樣表面并未出現(xiàn)明顯裂隙,表層土體累計(jì)脫濕量由3.16%變?yōu)?.36%,脫濕速率由0.58%/d變?yōu)?.37%/d,表層土體溫度變化平均值由0.58℃變?yōu)?.37℃。可見(jiàn),短期降雨、蒸發(fā)過(guò)程對(duì)植被覆蓋下膨脹土的持水能力影響不大。
[Abstract]:Taking the white strong expansive soil in Guangxi as the research object, the experiments of evaporation and re-evaporation of expansive soil samples without vegetation cover were carried out to study the effect of rainfall and evaporation process on the hygrothermal and fracture expansion characteristics of expansive soil. The results show that the surface reflectance of vegetation covered soil sample is smaller than that of non-vegetation covered soil sample, and the temperature difference of soil sample surface is 5 ~ 6 鈩，

本文編號(hào)：1875932