發(fā)布時(shí)間：2018-11-08 10:44

【摘要】：通過(guò)對(duì)具有不同初始含水率和干密度的兩種壓實(shí)黏質(zhì)砂土的脫濕曲線進(jìn)行測(cè)試、分析和對(duì)比,并結(jié)合核磁共振技術(shù),探討了干密度、初始含水率和土樣組分對(duì)壓實(shí)黏質(zhì)砂土脫濕過(guò)程的影響規(guī)律。利用核磁共振測(cè)得了試樣在各級(jí)吸力下的T2時(shí)間(橫向弛豫時(shí)間)分布曲線,定性地探討了不同吸力下試樣中的水分分布特征,揭示了干密度、初始含水率和土樣組分對(duì)試樣脫濕過(guò)程的微觀機(jī)制影響。試驗(yàn)結(jié)果表明:干密度僅在低基質(zhì)吸力條件下對(duì)試樣脫濕過(guò)程產(chǎn)生重要影響,而在高吸力條件下初始含水率和試樣組分起主導(dǎo)作用;核磁共振結(jié)果證實(shí)在壓實(shí)黏質(zhì)砂土中,小孔隙結(jié)構(gòu)主要由初始含水率和試樣組分控制,而大孔隙的結(jié)構(gòu)主要取決于干密度;試樣組分對(duì)壓實(shí)土的內(nèi)部結(jié)構(gòu)和孔隙大小分布的影響比初始含水率大。
[Abstract]:The desiccant curves of two kinds of compacted clay sand with different initial moisture content and dry density were measured, analyzed and compared, and the dry density was discussed by nuclear magnetic resonance (NMR). The effect of initial moisture content and soil sample composition on the dehumidification process of compacted clay sandy soil. The T 2 time (transverse relaxation time) distribution curves of samples under different suction forces were measured by nuclear magnetic resonance (NMR). The water distribution characteristics of samples under different suction forces were discussed qualitatively, and the dry density was revealed. The effect of initial moisture content and soil sample composition on the microscopic mechanism of sample dehumidification. The results show that the dry density has an important effect on the desiccant process only under the condition of low substrate suction, but the initial moisture content and the sample composition play the leading role under the condition of high suction. Nuclear magnetic resonance (NMR) results show that in compacted clay sand, the pore structure is mainly controlled by the initial moisture content and the sample composition, while the macropore structure is mainly determined by dry density. The effect of sample composition on the internal structure and pore size distribution of compacted soil is greater than that of initial moisture content.
【作者單位】： 中國(guó)科學(xué)院武漢巖土力學(xué)研究所巖土力學(xué)與工程國(guó)家重點(diǎn)實(shí)驗(yàn)室;長(zhǎng)江巖土工程總公司;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(No.NSFC#11072255) 中國(guó)科學(xué)院重要方向性項(xiàng)目(No.#KZCX2-YW-JS108) 廣西自然科學(xué)基金重點(diǎn)項(xiàng)目(No.2011GXNSFE018004)
【分類(lèi)號(hào)】：TU411

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