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程    良 ，杨建华

 

（陕西能源职业技术学院 建筑测绘学院 ，咸阳 712000)

摘   要 ：为了探究氯盐含量和含水率对土体强度及体变特性的影响规律 ，准确分析外界条件改变下氯盐渍  土强度变化和体变的内在原因 ，通过在黄土中添加不同含量 NaCl 的方法配置单一盐类盐渍土 ，采用无侧限压缩  试验和 SEM 扫描电镜方法开展试验研究。结果表明：氯盐渍土的强度总体随含水率的降低而提高 ，12% 含水率  作为氯盐渍土强度变化的临界点 ，在含水率大于 12% 时 ，土体强度随含盐量的增大而降低 ， 当含水率小于 12%   时 ，土体强度表现为 3% NaCl > 1% NaCl > 5% NaCl > 不含 NaCl;  氯盐渍土的体变由制样时的弹性压缩变形 、失水  时的体缩与盐胀三部分组成 ，在不含 NaCl 、1% NaCl 和 3% NaCl 含量时土体一直处于体缩状态 ，在 5% NaCl 含量  下随着含水率减小 ，土体呈现先体缩后体胀变化规律 ，含水率在 15% 时体缩量最大 ；SEM 扫描电镜图像显示， 土中的 NaCl 结晶体呈颗粒状填充于土颗粒之间的空隙或呈釉状将土颗粒包裹 ，影响着土体强度及体变 ，扫描电  镜图像分析发现不含 NaCl 的土体孔隙数量最多 ，3% NaCl 的土体孔隙数量最少。

关键词：无侧限压缩 ；盐渍土 ；强度 ；体变

中图分类号：TU411            文献标志码：A         

  

文章编号： 1005- 8249   (2025)  03- 0090- 06 

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .03 .017

CHENG Liang, YANG Jianhua

( School of Architecture and Geomatics Engineering  Shaanxi Energy Institute , Xianyang 712000 , China)

Abstract: In order to explore the influence of chlorine salt content and moisture content on the influence of soil strength and body characteristics, accurately analyze the external conditions change chlorine saline soil strength change and the internal causes of body change, through the method of adding different content NaCl configuration single salt saline soil, using no limit compression test and SEM scanning EM method. The results show that the overall strength of chlorine saline soil increases with the decrease of water content, 12% water content as the critical point for the strength change of chlorine saline soil, At a moisture content greater than 12%, The strength of the soil decreased with increasing salt content, When the moisture content is less than 12%, The strength of the soil was 3%NaCl> 1%NaCl> 5%NaCl> without NaCl; The body change of chlorine saline soil consists of three parts: elastic compression deformation during sample preparation, body shrinkage during water loss and salt swelling, In the absence of NaCl, 1%NaCl and 3%NaCl, At 5%NaCl content with decreasing moisture content, The soil shows the change law of the first body shrinkage and then the body expansion, The body shrinkage is the largest when the moisture content is at 15%; SEM SEM images display, The NaCl crystals in the soil fill the gap between the soil particles or wrap the soil particles in a glaze shape, Affect the strength and body change of the soil, SEM image analysis revealed the largest number of soil pores without NaCl, 3%NaCl has the least number of pores.

Key words: unconfined compression; saline soil; strength; volume change

作者简介：程    良  (1992—) ,  男 ，硕士 ，讲师 ，研究方向： 黄土力学与特殊土 、建筑工程技术。

通信作者：杨建华  (1963—) ,  男 ，硕士 ，二级教授 ，研究方向：建筑工程技术。

收稿日期：2024 - 08 - 01