Study on Simulation Test of Peat Soil Environment in Dianchi Lake
Study on Simulation Test of Peat Soil Environment in Dianchi Lake
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DOI：
10.1155/2022/1437733
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发表时间：
2022-06-02
影响因子：
1.8
通讯作者：
Liu, Fangyi
中科院分区：
文献类型：
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作者：
Cao, Jing;Huang, Siyang;Liu, Fangyi
泥炭土环境（PSE）模拟的效果和可行性是岩土环境工程中的一个难题。本研究测定了滇池泥炭土中腐殖基（HG）的实际含量，并采用向粘性土中加入腐殖酸（HA）试剂，用富里酸（FA）溶液浸泡的方法模拟滇池PSE。通过对比试验样品和天然泥炭土中汞的含量，研究了模拟试验的效果和可行性。通过扫描电镜（SEM）和X射线衍射（XRD）分析了HG对PSE显微组织和材料成分的影响。结果表明，滇池7个采样点汞含量及其PSE组分存在较大差异。本研究采用的模拟方法可以模拟不同HA和FA含量的PSE，但将样品浸泡在FA溶液中的模拟方法无法达到实际效果。SEM测试证实，HA试剂的加入会增加孔径和孔连通性。而FA通过吸附作用包裹在土的骨架上，填充部分孔隙，使孔隙直径变小，孔隙连通性变弱。XRD测试表明，HA和FA均能降低样品中主要物质的衍射峰，但对SiO2的衍射峰无影响。其原因是HG与粘性土颗粒发生配位交换和离子交换，游离HG与粘性土颗粒结合，转化为结合HG，形成有机-无机复合PSE。
The effect and feasibility of peat soil environment (PSE) simulation pose a difficult problem for geotechnical environmental engineering. In this study, the actual content of humic group (HG) in peat soil of Dianchi Lake is determined, and the method of adding humic acid (HA) reagent into cohesive soil and soaking it in fulvic acid (FA) solution is used to simulate PSE of Dianchi Lake. By comparing the HG content of test samples and natural peat soil, the effect and feasibility of simulation test are studied. And the effects of HG on microstructure and material composition of PSE are analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD) tests. The test results show that the content of HG and its components of PSE in seven sites of Dianchi Lake are quite different. The simulation method used in this study can simulate the PSE with different HA and FA contents, but the simulation method of soaking samples in FA solution cannot reach the actual effect. The SEM test confirm that the pore size and pore connectivity will increase with the HA reagent. However, FA is wrapped on the skeleton of soil through adsorption and fills some pores, which reduces the pore diameter and weakens pore connectivity. The XRD test shows that both HA and FA can reduce the diffraction peak of main substances in the samples, but not including SiO2. The reason is that HG and cohesive soil particles undergo coordination exchange and ion exchange; free HG combines with cohesive soil particles and transforms into bound HG, forming an organic-inorganic complex PSE.