天然鹽漬土冷端階梯式持續(xù)降溫鹽-凍脹及水鹽遷移試驗研究
發(fā)布時間:2018-01-03 11:03
本文關(guān)鍵詞:天然鹽漬土冷端階梯式持續(xù)降溫鹽-凍脹及水鹽遷移試驗研究 出處:《科學技術(shù)與工程》2016年31期 論文類型:期刊論文
更多相關(guān)文章: 天然鹽漬土 冷端持續(xù)降溫 鹽-凍脹 起脹溫度 水鹽遷移
【摘要】:為研究羅布泊地區(qū)天然鹽漬土中鹽-凍脹規(guī)律和鹽脹機制,選取羅布泊含砂低液限粉土在自動化大尺寸可控溫度循環(huán)儀中冷端階梯式持續(xù)降溫,進行鹽-凍脹試驗。結(jié)果表明,該土為含砂低液限粉土,在土體溫度為5~0℃時,發(fā)生明顯土體膨脹,此溫度區(qū)間為該土類鹽脹起脹溫度區(qū);冷端持續(xù)降溫過程土體膨脹變形可分為3個階段,第一階段為鹽脹起脹階段,第二階段為鹽脹增長階段,第三階段為鹽-凍脹共同增長階段;水分與鹽分從暖端向冷端遷移,其中氯離子與水分遷移具有一定共性,而硫酸根離子與二者不同。
[Abstract]:As a natural saline soil salt - Research of Lop Nor area law of frost heave and salt expansion mechanism, selection of Lop Nor silt in the automatic size controlled temperature cycle in the cold end of the ladder continued to cool, salt - Frost Heaving test. The results showed that the soil is silt, soil temperature 5~0 C, obvious soil swelling, the temperature range of the soil salt heaving temperature; cold end continuous cooling process of the expansive deformation can be divided into 3 stages, the first stage is the salt heaving stage, second stages of growth for the salt expansion stage, third stages of common growth of salt frost heaving stage; water and salt migration from the warm end to the cold end, the chloride ion and water migration has some similarities, and sulfate ions and two different.
【作者單位】: 新疆農(nóng)業(yè)大學水利與土木工程學院;
【基金】:國家自然科學基金(41262012) 新疆水文學及水資源重點學科基金(xjswszyzdxk20101202)資助
【分類號】:TU448
【正文快照】: 和新疆水文學及水資源重點學科基金(xjswszyzdxk20101202)資助鹽漬土與非鹽漬土相比具有獨特的三相性,土體中的易溶鹽會因外部環(huán)境的變化在固相與液相之間轉(zhuǎn)換[1]。這種土質(zhì)特性使得鹽漬土地區(qū)易發(fā)生鹽脹、溶陷、腐蝕和翻漿等工程病害。鹽漬土的礦物成分、顆粒形狀及排列方式,
本文編號:1373593
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