滨海氯盐渍土溶陷及盐胀特性

发布时间：2018-01-13 00:04

  本文关键词：滨海氯盐渍土溶陷及盐胀特性　出处：《长安大学学报(自然科学版)》2014年04期 　论文类型：期刊论文

  更多相关文章： 道路工程 氯盐渍土 冻融循环 上覆荷载 溶陷 盐胀

【摘要】：为了深入研究滨海氯盐渍土的溶陷和盐胀特性,在不同初始含水量、含盐量及上覆荷载条件下,进行了室内溶陷试验研究,完成了4次降温-升温循环下的盐胀试验,得到了不同含盐量试样的冻融循环盐胀规律,并通过改变荷载条件,对比分析了无荷和有荷情况下的盐胀规律。研究结果表明:影响氯盐渍土溶陷性质的主要因素是初始含水量和含盐量,初始含水量较小时,土样溶陷的敏感度更强,其溶陷系数较大;随着含盐量增大,不同荷载条件下的溶陷系数均表现为抛物线趋势,当含盐量为10%时,溶陷系数曲线出现明显的峰值;5℃~-10℃的降温区间是盐胀量迅速增大期;冻融循环条件下,盐渍土出现残余盐胀量,并表现盐胀累加性,累加性随着冻融循环次数的增多而减弱;上覆荷载对盐胀有明显的抑制作用,荷载作用使起胀温度大大提高,说明荷载对盐胀的发展有延缓作用。
[Abstract]:In order to study the dissolution and salt dilatation characteristics of littoral chlorinated saline soil indoor solution test was carried out under the conditions of different initial water content salt content and overlying load. The salt heaving test under four temperature-temperature cycles has been completed, and the salt heaving laws of different salt content samples have been obtained, and the loading conditions have been changed. The results show that the main factors affecting the solution properties of chlorinated saline soil are initial water content and salt content, and the initial water content is small. The sensitivity of soil sample is stronger and the coefficient of dissolution is larger. With the increase of salt content, the dissolution coefficient shows parabola trend under different loading conditions. When the salt content is 10, the dissolution coefficient curve has obvious peak value. The cooling range of 5 鈩，

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