本文關鍵詞： 凍融循環(huán) 雙向凍結-單向融化 壓縮變形 水分遷移 融土相對壓縮系數(shù)　出處：《巖土力學》2015年04期 　論文類型：期刊論文

【摘要】：通過室內凍融試驗,研究雙向凍結-單向融化作用下不同凍前含水率和干密度對青藏粉黏土壓縮特性的影響及水分遷移的變化規(guī)律。試驗結果表明:(1)大梯度凍融作用使低密度土壓縮性減小,使高密度土壓縮性增大;而小梯度凍融作用使低、高密度土的壓縮性均減小;(2)隨著凍前含水率的增加,大梯度凍融作用使土體壓縮性增大,但變化幅度逐漸減小,小梯度凍融作用的土體壓縮性變化并不明顯;(3)隨著凍結梯度的增加,不同干密度融土相對壓縮系數(shù)均呈現(xiàn)先減小后增加的變化趨勢,不同凍前含水率融土相對壓縮系數(shù)總體呈增大趨勢;(4)溫度梯度凍結后,試樣含水率分布從上冷端到下冷端呈增大-減小-增大的變化規(guī)律,隨著凍結溫度梯度的減小,試樣中部含水率先增大后減小。
[Abstract]:Through indoor freeze-thaw tests, The effects of moisture content and dry density on the compression characteristics of Qinghai-Xizang silt and its water migration under bidirectional freezing and unidirectional melting were studied. The experimental results showed that the compression of low-density soil was reduced by the freezing and thawing with large gradient freezing and thawing. The compressibility of high-density soil increased with the increase of moisture content before freezing, but decreased gradually with the increase of moisture content before freezing, but the range of variation decreased gradually with the increase of moisture content before freezing, while the compressibility of high-density soil increased by low-gradient freezing and thawing, while the compressibility of high-density soil decreased with the increase of moisture content before freezing. With the increase of freezing gradient, the relative compressibility coefficient of different dry density thawed soils decreased first and then increased. After freezing, the moisture content distribution of the sample increased from the upper cold end to the lower cold end with the change of increasing, decreasing and increasing, and with the decrease of the freezing temperature gradient, the relative compression coefficient of the melt soil with different moisture content showed an increasing trend after freezing, and the distribution of water content of the sample increased from the upper cold end to the lower cold end. The moisture content in the middle of the sample first increased and then decreased.
【作者單位】： 中國礦業(yè)大學深部巖土力學與地下工程國家重點實驗室;中國礦業(yè)大學力學與建筑工程學院;
【基金】：國家重點基礎研究發(fā)展計劃(973計劃)項目(No.2012CB026103) 國家自然科學基金(No.41271096) 博士后特別資助(No.2014T70555)
【分類號】：TU445;TU411

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