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  本文關鍵詞： 道路工程 鹽漬土 等效吸力 剪切強度 粉土 黏土 鹽離子濃度　出處：《公路交通科技》2015年08期 　論文類型：期刊論文

【摘要】：針對不同含鹽量和含水量的粉土和黏土進行直剪試驗,分析鹽漬土的黏聚力和內摩擦角與鹽離子濃度、溶質吸力和基質吸力的關系,用非飽和土剪切強度理論和雙電層理論解釋剪切強度增加機理,提出鹽溶液的有效應力概念和計算表達,建立有效應力與黏聚力的關系。粉土鹽漬土和黏土鹽漬土的直剪試驗結果表明:粉土鹽漬土的剪切強度參數(shù)與含鹽濃度的關系是,當含鹽濃度小于飽和濃度,剪切強度參數(shù)隨含鹽濃度增加基本不變;當含鹽濃度大于飽和濃度,剪切強度參數(shù)隨含鹽濃度增加而增加。黏土鹽漬土的剪切強度參數(shù)與含鹽濃度的關系是,剪切強度參數(shù)隨含鹽濃度增加而增加,當含鹽濃度大于飽和濃度,剪切強度參數(shù)隨含鹽濃度增加而增加得幅度大。粉土鹽漬土和黏土鹽漬土的剪切強度機理不同,粉土鹽漬土的剪切強度增加是由鹽結晶膠結和充填引起的,黏土鹽漬土的剪切強度增加是由雙電層作用和鹽結晶膠結共同引起的。
[Abstract]:Direct shear tests were carried out on silt and clay with different salt content and water content, and the relationship between cohesion and internal friction angle of saline soil and salt ion concentration, solute suction and matrix suction was analyzed. The theory of shear strength of unsaturated soil and the theory of double electric layer are used to explain the increasing mechanism of shear strength, and the concept and expression of effective stress of salt solution are put forward. The direct shear test results of silt saline soil and clay saline soil show that the relationship between shear strength parameter and salt concentration of silt salt soil is that the salt concentration is less than saturation concentration. The shear strength parameters are almost unchanged with the increase of salt concentration. When the salt concentration is greater than the saturated concentration, the shear strength parameter increases with the increase of the salt concentration. The relationship between the shear strength parameter and the salt concentration is that the shear strength parameter increases with the increase of the salt concentration. When the salt concentration is higher than the saturated concentration, the shear strength parameter increases greatly with the increase of the salt concentration. The shear strength mechanism of the silt saline soil and the clay saline soil is different. The increase of shear strength of saline soil is caused by salt crystal cementation and filling, and the increase of shear strength of clay salt soil is caused by the action of double electric layer and salt crystal cementation.
【作者單位】： 揚州工業(yè)職業(yè)技術學院;上海交通大學船舶海洋與建筑工程學院;河海大學聞天學院;南通市公路管理處;
【基金】：江蘇省交通運輸廳科研課題項目(2012Y01-1,2014Y04) 國家自然科學基金項目(41272318,41472251) 揚州市自然科學基金項目(YZ2014057)
【分類號】：U416.1;U412.221
【正文快照】： 0引言濱海相鹽漬土是經(jīng)過海水長期浸濕、淋濾形成的,含鹽成分與海水一致,以Na Cl為主,通常含有較多的粉粒與黏粒[1]。濱海相鹽漬土的孔隙水中含有大量的Na+,K+,Ca2+,Mg2+等可溶鹽離子,造成鹽漬土的特殊工程性質,主要有鹽漬土地基溶陷和鹽脹性[2-3]、鹽漬土的腐蝕性[4-6]等,對

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相關期刊論文 前4條

1 郭菊彬;宋吉榮;張昆;;鹽漬土強度參數(shù)與含鹽量、含水量關系初探[J];四川建筑科學研究;2007年05期

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