氯盐渍土无侧限抗压强度及体变特性研究

打开文本图片集

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

Abstract：Inorder toexploretheinfluenceofchlorinesaltcontentandmoisturecontentontheinfluenceofsoilstrengthand bodycharacteristics，accuratelyanalyzetheexteral conditionschange chlorinesalinesoil strengthchangeandtheinternal causes ofbodychange，throughthe methodofaddingdiferentcontent NaClconfigurationsinglesalt salinesoil，using no limit compression testand SEMscanningEMmethod.Theresultsshow that theoveralstrengthof chlorinesalinesoil 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 soilconsistsofthreeparts：elasticcompresion deformation during samplepreparation，body shrinkage during waterloss and salt sweling， In the absence of NaCl， 1%NaCl and 3%NaCl ，At 5% NaCl content with decreasing moisture content， The soilshowsthechangelawofthefirstbodyshrinkageandthenthebodyexpansion，Thebodyshrinkageisthelargestwhenthe moisture content is at 15% ；SEM SEM images display，The NaCl crystals in the soil fillthe gap between the soil particles or wrapthesoilparticlesinaglazeshape，Aectthestrengthandbodychangeofthesoil，SEMimageanalysisrevealedthelargest number of soil pores without NaCl ， 3% NaCl has the least number of pores.

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

0 引言

盐渍土在我国西北内陆分布很广，其工程性质表现出浸水后溶陷、强度降低、黏性增大，失水后盐胀、强度提高、压缩性降低的特点，在复杂多变的建设工程环境下，经常引发建筑物地基不均匀沉降、边坡失稳、路基鼓胀或溶陷等病害。（剩余5514字）