本文選題：膨脹土 + 裂隙��； 參考：《巖土力學(xué)》2014年S1期

【摘要】：以廣西白色強(qiáng)膨脹土為研究對象,對有、無植被覆蓋和農(nóng)膜覆蓋的膨脹土分別進(jìn)行30 d持續(xù)蒸發(fā)試驗,研究持續(xù)蒸發(fā)過程對膨脹土濕熱和裂隙拓展特性的影響。結(jié)果表明,無植被覆蓋時表層土體脫濕量及脫濕速率分別為7.38%和0.17%/d,植被覆蓋時分別為5.29%和0.07%/d,顯然植被覆蓋的脫濕量和脫濕速率均小于無植被覆蓋的,而農(nóng)膜覆蓋土體蒸發(fā)受到遏制,水分無散失;無植被覆蓋和農(nóng)膜覆蓋土體平均溫度變化分別是7.36℃和9.72℃,比植被覆蓋的2.03℃大5~8℃,可見植被覆蓋降低了土體溫度變化幅度;無植被覆蓋土體裂隙深度達(dá)32 cm,與濕熱影響深度28 cm較接近;植被覆蓋和農(nóng)膜覆蓋土體平面及豎向均無出現(xiàn)明顯裂隙,植被覆蓋和蒸發(fā)受到遏制的狀態(tài)可阻止土體裂隙開展。
[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，

本文編號：1886669