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程    良 ，楊建華

 

（陜西能源職業(yè)技術學院 建筑測繪學院 ，咸陽 712000)

摘   要 ：為了探究氯鹽含量和含水率對土體強度及體變特性的影響規(guī)律 ，準確分析外界條件改變下氯鹽漬  土強度變化和體變的內(nèi)在原因 ，通過在黃土中添加不同含量 NaCl 的方法配置單一鹽類鹽漬土 ，采用無側限壓縮  試驗和 SEM 掃描電鏡方法開展試驗研究。結果表明：氯鹽漬土的強度總體隨含水率的降低而提高 ，12% 含水率  作為氯鹽漬土強度變化的臨界點 ，在含水率大于 12% 時 ，土體強度隨含鹽量的增大而降低 ， 當含水率小于 12%   時 ，土體強度表現(xiàn)為 3% NaCl > 1% NaCl > 5% NaCl > 不含 NaCl;  氯鹽漬土的體變由制樣時的彈性壓縮變形 、失水  時的體縮與鹽脹三部分組成 ，在不含 NaCl 、1% NaCl 和 3% NaCl 含量時土體一直處于體縮狀態(tài) ，在 5% NaCl 含量  下隨著含水率減小 ，土體呈現(xiàn)先體縮后體脹變化規(guī)律 ，含水率在 15% 時體縮量最大 ；SEM 掃描電鏡圖像顯示， 土中的 NaCl 結晶體呈顆粒狀填充于土顆粒之間的空隙或呈釉狀將土顆粒包裹 ，影響著土體強度及體變 ，掃描電  鏡圖像分析發(fā)現(xiàn)不含 NaCl 的土體孔隙數(shù)量最多 ，3% NaCl 的土體孔隙數(shù)量最少。

關鍵詞：無側限壓縮 ；鹽漬土 ；強度 ；體變

中圖分類號：TU411            文獻標志碼：A         

  

文章編號： 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

作者簡介：程    良  (1992—) ,  男 ，碩士 ，講師 ，研究方向： 黃土力學與特殊土 、建筑工程技術。

通信作者：楊建華  (1963—) ,  男 ，碩士 ，二級教授 ，研究方向：建筑工程技術。

收稿日期：2024 - 08 - 01