基于拉曼光谱研究砒砂岩与沙复配土的胶结作用力

发布时间：2018-03-23 15:25

  本文选题：光谱学　切入点：胶结作用力　出处：《激光与光电子学进展》2017年11期

【摘要】：为了研究陕北地区毛乌素沙地中砒砂岩与沙复配土颗粒的胶结作用力,将砒砂岩与沙按不同的体积比配制复配土,采用拉曼光谱仪测试复配土粉末的拉曼光谱;根据复配土中化学成分SiO2在拉曼位移为464cm-1处的特征峰峰位随砒砂岩含量的变化,研究了土体颗粒胶结作用力的变化。结果表明:沙的峰位为464.5cm-1,随着砒砂岩含量增加,峰位逐渐减小;这是因为沙中砒砂岩的添加使得砒砂岩中的小颗粒占据了沙中部分大颗粒的位置,颗粒间的距离变大,颗粒间相互牵引而产生拉应力,从而导致拉曼特征峰红移;当砒砂岩与沙的体积比为1…1时,峰位减小到463.6cm-1;当砒砂岩与沙的体积比为7…5时,土体结构发生坍塌,变得紧实,土体颗粒之间产生了压应力,导致峰位突然增大到464.2cm-1,之后土体结构趋于稳定;随着砒砂岩含量进一步增加,仍有砒砂岩小颗粒对沙大颗粒的置换作用,导致拉应力逐渐明显,峰位不断减小,当复配土为全砒砂岩时峰位为463.1cm-1。实验结果证实了可将SiO2分子拉曼光谱特征峰峰位的移动用于研究复配土颗粒间的胶结作用力。
[Abstract]:In order to study the cementation force between arsenite and sand particles in Maowusu sandy land in northern Shaanxi Province, the mixed soil was prepared according to different volume ratio of arsenite and sand. Raman spectroscopy was used to test the Raman spectrum of the composite soil powder. According to the change of the characteristic peak position of the chemical composition SiO2 in the compound soil when the Raman shift is 464cm-1, the change of soil particle cementation force is studied. The results show that the peak position of sand is 464.5 cm ~ (-1), which increases with the increase of the content of arsenitic sandstone. The peak position decreases gradually because the addition of arsenite in sand causes the small particles in the sand to occupy the position of part of the large particles in the sand, the distance between the particles becomes larger, and the traction between the particles results in tensile stress. When the volume ratio of arsenosite to sand is 1. 1, the peak position decreases to 463.6 cm-1, and when the volume ratio of arsenosite to sand is 7. 5, the soil structure collapses and becomes compacted, resulting in compressive stress between particles. As a result, the peak suddenly increased to 464.2cm-1, and then the soil structure tended to be stable, and with the further increase of the content of arsenopyst, there was still the displacement of small Pisha sandstone particles to the large sand particles, which led to the obvious tensile stress and the decrease of peak position. The peak position of the composite soil is 463.1 cm ~ (-1) when the composite soil is a full arsenopyst. The experimental results confirm that the shift of the peak position of the characteristic peak of SiO2 molecular Raman spectrum can be used to study the cementation force between the particles of the composite soil.
【作者单位】： 陕西省土地工程建设集团有限责任公司;陕西地建土地工程技术研究院有限责任公司;国土资源部退化及未利用土地整治工程重点实验室;陕西省土地整治工程技术研究中心;
【基金】：陕西省重点科技创新团队计划(2016KCT-23)
【分类号】：O657.37;S152
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本文编号：1654045