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弱酸侵蚀作用下CaCO3对黄土液塑限的影响
孟杰1, 李喜安1,2, 吴建辉3, 张爽1, 王力1, 张晨1
1.长安大学 地质工程与测绘学院, 陕西 西安 710054;2.国土资源部 岩土工程开放研究实验室, 陕西 西安 710054;3.河北省地矿局第一地质大队, 河北 邯郸 056001
摘要:
[目的]探讨碳酸钙赋存形式及其在黄土微结构中的作用,为弱酸侵蚀作用下碳酸钙对黄土液塑限的影响机理提供依据。[方法]首先采用蒸馏水洗去黄土中易溶盐,再经1 mol/L的醋酸溶液处理得到不同碳酸钙含量的黄土试样,采用液塑限联合测定仪测定黄土液塑限指标;借助扫描电子显微镜(SEM)对试样进行X射线能谱分析(EDX)获取元素Mapping图像进行分析。[结果]①醋酸作用下,液塑限随碳酸钙含量的减少而显著降低;②碳酸钙块、超细碳酸钙以骨架颗粒、集粒形式与Si,Al,Si-Fe接触,其主要作用为颗粒之间连接胶结作用以及充当黄土的孔隙骨架。[结论]醋酸处理前期以黏粒中碳酸钙溶解为主,进而黏粒的流失导致黄土砂化而最终影响了其液塑限指标。
关键词:  碳酸钙  液塑限  酸侵蚀  元素
DOI:10.13961/j.cnki.stbctb.2018.03.019
分类号:
基金项目:国家自然科学基金项目“基于三维微观结构的黄土湿陷性成因及潜蚀黄土场地湿陷机理研究”(41572264),“洞穴侵蚀环境研究下黄土斜坡滑塌机理研究”(41172255),“沙漠—黄土高原过渡区风积砂性黄土动力特性试验研究”(41440044)
Influence of CaCO3 on Loess Liquid and Plastic Limits Under Weak Acid Erosion
MENG Jie1, LI Xi1,2, WU Jianhui3, ZHANG Shuang1, WANG Li1, ZHANG Chen1
1.School of Geological Engineering and Geomatics, Chang'an University, Xi'an, Shaanxi 710054, China;2.Open Research Laboratory of Geotechnical Engineering, Ministry of Land and Resources, Xi'an, Shaanxi 710054, China;3.No.1 Geology Team of Exploration Bureau of Hebei Province, Handan, Hebei 056001, China
Abstract:
[Objective] To study the form of calcium carbonate and its effect on the loess microstructure in order to provide basis for the study of influence mechanism of calcium carbonate on the loess liquid and plasticity limits.[Methods] First, using distilled water to wash soluble salt in loess, and obtained loess samples with different contents of calcium carbonate processed by 1 mol/L acetic acid solution. Liquid and plastic limits joint meter was used to measure loess liquid plastic limit indicator. The scanning electron microscope (SEM) was used to analyze the X-ray energy dispersive microanlysis(EDX).[Results] ① Under the action of acetic acid, the liquid plastic limit decreased significantly with the decrease of calcium carbonate. ② Calcium carbonate blocks and superfine calcium carbonate were exposed as the skeleton and set granules to Si, Al and Si-Fe, and its main function was to connect the cementation between the particles and the pore skeleton of the loess.[Conclusion] In the early stage of acetic acid treatment, the calcium carbonate was mainly dissolved in the clay granule, and the loss of granule led to the loss of loess sand soil and eventually affected the liquid and plastic limit index.
Key words:  calcium carbonate  liquid and plastic limits  acid attack  element