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典型天然盐渍土多次冻融循环盐胀试验研究
引用本文:包卫星,杨晓华,谢永利.典型天然盐渍土多次冻融循环盐胀试验研究[J].岩土工程学报,2006,28(11):1991-1995.
作者姓名:包卫星  杨晓华  谢永利
作者单位:长安大学公路学院;长安大学公路学院 陕西西安710064;新疆交通建设管理局;新疆乌鲁木齐830001;陕西西安710064;
基金项目:国家西部交通建设科技项目
摘    要:通过对新疆喀什地区12处天然盐渍土室内基本性质试验分析,选取典型天然盐渍土,在开放系统中进行反复冻融循环条件下的试验研究。从土的类别角度研究了天然盐渍土的盐胀规律。试验结果表明:低液限粘土前五次冻融循环过程中盐胀具有较好累加性,随着冻融循环次数的增加,盐胀量增长速度逐渐降低;含砂低液限粘土的盐胀过程可以被分为三个阶段;粘土质砂在冻融循环过程中的变形主要为冻胀和沉降变形,具有较好的溶陷累加性;低液限粘土、含砂低液限粘土的盐胀率和粘土质砂的溶陷率与冻融周期之间的关系符合二次抛物线变化规律。

关 键 词:道路工程  盐胀  冻融循环  天然盐渍土  开放系统  溶陷  
文章编号:1000-4548(2006)11-1991-05
收稿时间:2005-09-16
修稿时间:2005-09-16

Research on salt expansion of representative crude saline soil under freezing and thawing cycles
BAO Wei-Xing,YANG Xiao-Hua,XIE Yong-Li.Research on salt expansion of representative crude saline soil under freezing and thawing cycles[J].Chinese Journal of Geotechnical Engineering,2006,28(11):1991-1995.
Authors:BAO Wei-Xing  YANG Xiao-Hua  XIE Yong-Li
Affiliation:1.School of Highway Chang’an University Xi’an 710064 China 2.Sinkiang Traffic Construction Management Bureau Urumchi 830001 China
Abstract:Based on the test results of saline soil samples of twelve places(Kashi,Sinkiang,China),the representative crude saline soil samples were selected for the experiment of freezing and thawing cycles in laboratory.The salt expansion laws of crude saline soil were researched by use of three kinds of soil.It was shown that salt expansion value of low liquid-limit clay was accumulated before the sixth freezing and thawing cycles,but the increment of salt expansion was reduced gradually with increasing cycles;the salt expansion accumulation of low liquid-limit clay could be separated into three phases;the deformation of clayey sand was mostly frost heave and subsidence under cycles,and collapsibility value of clayey sand was accumulated with increasing cycles;the variation of salt expansion ratio and collapsibility ratio was a parabolic function of freezing and thawing cycles.
Keywords:road engineering  salt expansion  freezing and thawing cycles  crude saline soil  open systems  collapsibility
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