本文選題：壓實(shí)黏土 + 溫度梯度�。� 參考：《東北大學(xué)學(xué)報(自然科學(xué)版)》2017年06期

【摘要】：開展了室內(nèi)壓實(shí)黏土體模型柱試驗,研究了溫度梯度作用對壓實(shí)黏土水熱遷移和滲透性的響應(yīng)規(guī)律.結(jié)果表明:熱量在黏土柱下部比黏土柱上部傳輸快,溫度的升高隨離熱源距離的增加而明顯延遲;底部熱源促使壓實(shí)黏土柱產(chǎn)生溫度梯度,進(jìn)而促使水汽在黏土柱內(nèi)由底向上遷移,造成水分損失較快;隨熱源的持續(xù)作用,黏土柱內(nèi)溫度梯度逐漸下降,水汽遷移速率減小,含水率下降緩慢并趨于穩(wěn)定.熱源持續(xù)作用使土柱上表面開裂程度明顯大于下底面,用示蹤劑來粗略測量裂縫深度是可行的.溫度梯度作用不同程度地增大了黏土體的滲透系數(shù),且黏土柱的兩端滲透系數(shù)增加較快,中間部分增大倍數(shù)次之.
[Abstract]:Laboratory compacted clay model column tests were carried out to study the response of temperature gradient to the hydrothermal migration and permeability of compacted clay. The results show that the heat transfer in the lower part of the clay column is faster than that in the upper part of the clay column, the increase of temperature is delayed with the increase of distance from the heat source, and the temperature gradient of the compacted clay column is induced by the bottom heat source. As a result, water vapor migrates from bottom to top in clay column, which results in fast water loss. With the continuous action of heat source, the temperature gradient in clay column decreases gradually, the water vapor migration rate decreases, and the water content decreases slowly and tends to stabilize. The cracking degree of the upper surface of the soil column is obviously greater than that of the bottom surface due to the continuous heat source. It is feasible to use tracer to roughly measure the crack depth. The temperature gradient increases the permeability coefficient of clay to varying degrees, and the permeability coefficient of the two ends of the clay column increases rapidly, followed by the increase multiple of the middle part.
【作者單位】： 東南大學(xué)交通學(xué)院;武漢輕工大學(xué)土木工程與建筑學(xué)院;
【基金】：國家自然科學(xué)基金資助項目(51279032) 國家“十二五”科技支撐計劃項目(2012BAJ01B02) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專項資金 江蘇省普通高校研究生科研創(chuàng)新計劃資助項目(KYLX_0147)
【分類號】：TU442

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