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硫酸根溶液溶滤作用下复合黄土渗透特性研究

Study on Permeability Characteristics of Composite Loess Under Soluble Filtration of Sulfate Solution
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摘要 【目的】研究降水和地表径流中离子与土体接触后发生的物化反应对土体物理力学性质的影响,进而探究其对路基承载能力的影响。【方法】以郑州某地黄土、再生混凝土骨料和硫酸根溶液为试验材料,利用三轴试验仪对不同掺量复合黄土试样在不同硫酸根离子浓度条件下开展固结、渗透、排水剪切和电镜扫描试验。【结果】掺入再生混凝土骨料后,试样的渗透系数增加了3.95~4.32倍;随着溶液浓度的提高,渗透系数下降到原来的34.3%~38%。【结论】掺入再生混凝土骨料后,路基渗透系数增大,承载能力显著提升;溶液浓度的提高会导致渗透系数降低,进而降低路基承载能力。 [Purposes]This paper studies the influence of the physical and chemical reaction between ions and soil in precipitation and surface runoff on the physical and mechanical properties of soil,so as to explore its influence on the bearing capacity of roadbed.[Methods]In this study,loess,reclaimed concrete aggregate and sulfate solution in Zhengzhou were taken as test materials,and the three-axis tester was used to carry out consolidation,infiltration,drainage shear and EM scanning tests for different mixed composite loess samples under different sulfate ion concentration conditions.[Findings]After adding recycled concrete aggregate,the permeability coefficient of the sample increased by 3.95~4.32 times;with the increase of solution concentration,the permeability coefficient decreased to 34.3%~38%.[Conclusions]After the incorporation of recycled concrete aggregate,the subgrade permeability coefficient increases and the bearing capacity increases significantly;the increase of solution concentration will lead to the decrease of the permeability coefficient,thus reducing the bearing capacity of the subgrade.
作者 张恒昌 邢天佑 赵璇博 余海洋 范咏棋 潘佳辉 ZHANG Hengchang;XING Tianyou;ZHAO Xuanbo;YU Haiyang;FAN Yongqi;PAN Jiahui(Henan University of Engineering,Zhengzhou 451191,China)
机构地区 河南工程学院
出处 《河南科技》 2024年第21期62-66,共5页 Henan Science and Technology
基金 河南省2024年大学生创新创业训练计划国家级项目“探究HEC-剑麻纤维复合型黄土和粉质黏土在冻融作用下的力学性质”(202411517007)。
关键词 渗透系数 再生混凝土骨料 硫酸根离子浓度 孔隙率 permeability coefficient recycled concrete aggregate sulfate ion concentration porosity
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