盐渍土区路基土层级配特征及阻盐效应分析
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摘要
为研究盐渍土区域路基土层级配关键技术参数的选取与阻盐效应的关系,对盐渍土区已建路基土层开挖采样,分别进行颗粒分析实验、易溶盐含量测定和毛细管水上升实验,分析盐湖区盐渍土的颗粒级配、盐渍化强度和水盐运移上升高度计算方法。结果表明:研究区盐渍土为0.25~0.075 mm粒组含量有利于水盐运移,>0.25 mm粒组含量不利于水盐运移。路基阻盐隔断层关键参数宜选择:级配2.0~5.0 mm粒组含量大于75%,厚度在300~1 000 mm,可有效隔断路基土层中的水盐运移,阻盐效果良好。
The purpose of this study is to explore the relationship between the selection of the key technical parameters and the salt-resistance effect in subgrade soil layer in saline soil area. The particle analysis experiment,the soluble salt content determination and the capillary water rise experiment were carried out on the soil excavated from of the subgrade in saline soil area,and the calculation method of the grain gradation,salinization intensity and the rising height of water and salt migration of saline soil from salt lake area were analyzed. The results show that the content of saline soil( 0. 25 ~ 0. 075 mm) in the study area is favorable to water and salt migration,and saline soil group with greater than 0. 25 mm is unfavorable to water and salt migration. The key parameters of subgrade salt barrier should be selected. Gradation of 2. 0 ~ 5. 0 mm with more than 75% granule group content and,thickness in 300 ~ 1 000 mm,can effectively cut off the roadbed soil water and salt migration. The effect of salt resistance is good.
The purpose of this study is to explore the relationship between the selection of the key technical parameters and the salt-resistance effect in subgrade soil layer in saline soil area. The particle analysis experiment,the soluble salt content determination and the capillary water rise experiment were carried out on the soil excavated from of the subgrade in saline soil area,and the calculation method of the grain gradation,salinization intensity and the rising height of water and salt migration of saline soil from salt lake area were analyzed. The results show that the content of saline soil( 0. 25 ~ 0. 075 mm) in the study area is favorable to water and salt migration,and saline soil group with greater than 0. 25 mm is unfavorable to water and salt migration. The key parameters of subgrade salt barrier should be selected. Gradation of 2. 0 ~ 5. 0 mm with more than 75% granule group content and,thickness in 300 ~ 1 000 mm,can effectively cut off the roadbed soil water and salt migration. The effect of salt resistance is good.
引文
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[3]王丁,费良军.层状土壤上升毛管水运移特性试验研究[J].地下水,2009,31(1):35~37.
[4]虞卫国,房建宏.盐渍土中固相相态变化规律的研究[J].公路工程,2013,38(4):94~98.
[5]唐好鑫.新疆硫酸盐渍土地区路基温度和水盐运移规律的研究[D].北京:北京交通大学,2012.
[6]邵磊.察尔汗盐湖地区路基水盐迁移规律与隔断层设置技术研究[D].西安:长安大学,2012.
[7]XING ANQING.FREDLUND D G.Equations for the soil-water characteristic curve[J].Canadian Geotechnical Journal,1994,31(4):521-532.
[8]FREDLUND M D,WILSON G W,FREDLUND D G.Prediction of the soil-water characteristic curve fromthe grainsize distribution curve[J].Proceedings of The Symposium on Unsaturated soil Rio De Janeiro,1997:13-23.
[9]EVERETT D H.The thermodynamics of frost damage to porous solids[J].Transactions of the Faraday Sicuety,1961,57(5):1541-1551.
[10]魏凯,张文,刘昕,等.青海东部盐渍土颗粒级配对毛细管水上升影响的研究[J].青海大学学报,2016,34(3):1-8.
[11]谌文武,董兰凤.公路盐渍土路基处理与病害防治[J].天津城建大学学报,1999(1):61-65.
[12]赵中堂.天然级配卵砾石土毛细管水隔断层厚度的确定方法[J].路基工程,1992(4):4-8.
[13]赵德安,余云燕,马惠民,等.南疆铁路路基次生盐渍化试验研究[J].岩土工程学报,2014,36(4):745-751.
[14]汪林,甘泓,于福亮,等.西北地区盐渍土及其开发利用中存在问题的对策[J].水利学报,2001(6):90~95.
[15]沈明喜.干旱的盐渍土地区道路工程地质条件的初步研讨[J].水文地质工程地质,1958(5):3-7.
[16]魏凯.青海东部地区盐渍土毛细管水上升高度影响因素试验研究[D].西宁:青海大学,2016.
[17]杨仲全.盐渍土地区路基隔断层设置研究[J].中国水运(下半月),2012,12(11):218-220.
[18]陈晋中,刘松玉,朱志铎,等.路基土毛细水上升高度计算分析[C]//全国地基处理学术讨论会.南京:东南大学,2008.