作　　者： ; ; ;

机构地区： 长安大学公路学院

出　　处： 《岩土工程学报》 2006年第11期1991-1995,共5页

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。 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.

关 键 词： 道路工程 盐胀 冻融循环 天然盐渍土 开放系统 溶陷

领　　域： [建筑科学] [建筑科学] [交通运输工程]