【摘要】：川西地區(qū)地質(zhì)構(gòu)造和氣候條件復(fù)雜,交通荷載和降水入滲經(jīng)常會(huì)引發(fā)處于非飽和狀態(tài)的混合土公路路基變形過(guò)大或滑坡破壞,非飽和土的工程性質(zhì)主要與其吸力值緊密相關(guān)。為掌握川西非飽和混合土礦物成分與初始干密度對(duì)其土水特征曲線的影響規(guī)律,針對(duì)川西山區(qū)3種崩坡積混合土,采用濾紙法和壓力板儀法相結(jié)合的試驗(yàn)方案,縮短試驗(yàn)時(shí)間,測(cè)得各自在不同初始干密度下的土水特征曲線,并通過(guò)微觀特征來(lái)分析宏觀現(xiàn)象,探究混合土特征因素的影響機(jī)理。試驗(yàn)結(jié)果表明:礦物成分對(duì)土水特征曲線有顯著影響,親水礦物含量越高,基質(zhì)吸力越大且曲線走勢(shì)越平緩;反之,含有較多石英礦物和較少黏粒時(shí),基質(zhì)吸力通常較低;在相同基質(zhì)吸力條件下,干密度越大,土體含水量也越大;同時(shí),干密度對(duì)土水特征曲線的影響程度隨著含水量的減小而增大。最后,采用Van Genuchten(VG)模型擬合川西混合土土水特征曲線,其擬合參數(shù)與顆粒級(jí)配、非飽和程度相關(guān),擬合曲線與試驗(yàn)曲線吻合較好。
[Abstract]:The geological structure and climatic conditions in western Sichuan are complex, traffic load and precipitation infiltration often lead to excessive deformation or landslide damage of roadbed of mixed soil in unsaturated state. The engineering properties of unsaturated soil are mainly related to its suction value. In order to understand the influence of mineral composition and initial dry density of unsaturated mixed soil in western Sichuan on the characteristic curves of soil and water, the paper filter method and pressure plate method were used to combine the filter paper method and pressure plate method to shorten the test time for three kinds of sloping mixed soil in western Sichuan mountainous area. The soil and water characteristic curves at different initial dry densities were measured, and the macroscopic phenomena were analyzed by microscopic characteristics, and the influence mechanism of the characteristic factors of mixed soil was explored. The results show that the mineral composition has a significant effect on the soil-water characteristic curve, the higher the hydrophilic mineral content, the greater the matrix suction and the more gentle the curve trend, whereas the lower the matrix suction is when there are more quartz minerals and less clay particles. Under the condition of the same matrix suction, the more dry density, the larger the soil water content, and at the same time, the influence degree of dry density on soil-water characteristic curve increases with the decrease of water content. Finally, the Van Genuchten (VG) model is used to fit the characteristic curve of mixed soil and water in western Sichuan. The fitting parameters are related to particle gradation and unsaturated degree, and the fitting curve is in good agreement with the experimental curve.
【作者單位】： 西南交通大學(xué)高速鐵路線路工程教育部重點(diǎn)實(shí)驗(yàn)室;西南交通大學(xué)土木工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41572245)
【分類號(hào)】：U416.1

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