本文選題：非飽和粉質(zhì)黏土 + 凍結(jié)溫度��； 參考：《巖土工程學(xué)報》2017年08期

【摘要】：為掌握凍土凍結(jié)變形規(guī)律,揭示凍結(jié)變形機(jī)理,采用自行研制的溫控體變儀精確測量不同飽和度、孔隙比土樣的凍結(jié)變形,為計算凍土的體積含冰量,對非飽和粉質(zhì)黏土凍結(jié)溫度進(jìn)行了測量。室內(nèi)試驗結(jié)果及其數(shù)據(jù)分析表明:(1)非飽和粉質(zhì)黏土凍結(jié)溫度(冰點)主要由土樣初始基質(zhì)吸力決定,基質(zhì)吸力越大,凍結(jié)溫度越低。(2)非飽和粉質(zhì)黏土凍結(jié)變形隨飽和度變化存在兩種截然不同的機(jī)制,飽和度較低時,冰水相變影響較小,土體呈凍縮特征;飽和度較高時,冰水相變占主導(dǎo)作用,導(dǎo)致土體結(jié)構(gòu)破壞,呈凍脹特征。(3)非飽和粉質(zhì)黏土凍結(jié)體應(yīng)變與土體體積含冰量和初始孔隙比具有良好的經(jīng)驗關(guān)系,可以基于體積含冰量和初始孔隙比預(yù)測土體凍結(jié)體應(yīng)變,其中體積含冰量由土體凍結(jié)溫度、溫度、飽和度、干密度計算得到。
[Abstract]:In order to understand the freezing deformation law of frozen soil and reveal the mechanism of freezing deformation, the freezing deformation of soil samples with different saturation and void ratio was accurately measured by using the temperature controlled body variation instrument developed by ourselves, in order to calculate the volume ice content of frozen soil. The freezing temperature of unsaturated silty clay was measured. The indoor test results and data analysis show that the freezing temperature (freezing point) of unsaturated silty clay is mainly determined by the initial matrix suction of the soil sample, and the larger the matrix suction is, The lower the freezing temperature, the lower the freezing deformation of unsaturated silty clay has two different mechanisms with the change of saturation. When the saturation is low, the effect of ice water phase transition is small, and the soil is frozen shrinkage, and the ice water phase change dominates when the saturation is high. The frozen body strain of unsaturated silty clay has a good empirical relationship with the volume ice content and initial void ratio of the soil, and can be used to predict the frozen body strain based on the volume ice content and initial void ratio. The volume ice content is calculated by calculation of freezing temperature, temperature, saturation and dry density of soil.
【作者單位】： 北京交通大學(xué)城市地下工程教育部重點實驗室;多年凍土地區(qū)公路建設(shè)與養(yǎng)護(hù)技術(shù)交通行業(yè)重點實驗室青海研究觀測基地;
【基金】：國家自然科學(xué)基金項目(51479001,41471052) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專項項目(2014JBZ013) 北京市自然科學(xué)基金項目(8152024)
【分類號】：TU411

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