【摘要】：凍融循環(huán)作用改變了土體結(jié)構(gòu)及熱物理性質(zhì),進(jìn)而影響了土體溫度變化過程,土體凍結(jié)鋒面的穩(wěn)定位置也隨之變化.為研究凍融循環(huán)作用下土體凍結(jié)鋒面的移動(dòng)規(guī)律,進(jìn)行了開放系統(tǒng)下的蘭州黃土凍融循環(huán)試驗(yàn).試驗(yàn)結(jié)果表明:凍結(jié)初期凍結(jié)鋒面迅速下移,冷端溫度穩(wěn)定后其下移速度降低,當(dāng)土體溫度達(dá)到平衡時(shí),凍結(jié)鋒面位置趨于穩(wěn)定;凍結(jié)鋒面穩(wěn)定深度隨凍融循環(huán)次數(shù)的增加而增加.為闡述黃土凍結(jié)鋒面隨著時(shí)間變化規(guī)律,采用時(shí)間比擬法得到了凍融循環(huán)次數(shù)與凍融時(shí)間相似比擬曲線.由擬合曲線得第6次凍融循環(huán)后土體凍結(jié)鋒面穩(wěn)定在土樣高度24.4 mm處,實(shí)測穩(wěn)定在24.3 mm處,相對(duì)誤差為0.4%.
[Abstract]:The freezing and thawing cycles change the soil structure and thermo-physical properties, and then affect the soil temperature change process, and the stable position of the soil freezing front also changes. In order to study the moving law of soil freezing front under freeze-thaw cycle, the freeze-thaw cycle test of Lanzhou loess under open system was carried out. The experimental results show that the freezing front moves down rapidly at the initial freezing stage, and the velocity decreases after the cold end temperature stabilizes. When the soil temperature reaches equilibrium, the freezing front position tends to be stable. The stable depth of freezing front increases with the increase of freeze-thaw cycles. In order to expound the law of loess freezing front changing with time, the similar analogy curve between freezing and thawing times and freeze-thaw time was obtained by using time analogy method. According to the fitting curve, the freezing front of the soil after the sixth freeze-thaw cycle is stable at 24.4 mm of soil sample height, and the measured value is 24.3 mm, the relative error is 0.4.
【作者單位】： 中國科學(xué)院寒區(qū)旱區(qū)環(huán)境與工程研究所凍土工程國家重點(diǎn)實(shí)驗(yàn)室;中國科學(xué)院大學(xué);
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃項(xiàng)目(2012CB026102) 國家自然科學(xué)基金項(xiàng)目(41271080) 凍土工程國家重點(diǎn)實(shí)驗(yàn)室項(xiàng)目(SKLFSE-ZQ-35) 中國科學(xué)院西部行動(dòng)計(jì)劃項(xiàng)目(KZCX2-XB3-19)資助
【分類號(hào)】：P642.14
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本文編號(hào)：2382124