本文選題：光譜學(xué)　切入點(diǎn)：膠結(jié)作用力　出處：《激光與光電子學(xué)進(jìn)展》2017年11期

【摘要】：為了研究陜北地區(qū)毛烏素沙地中砒砂巖與沙復(fù)配土顆粒的膠結(jié)作用力,將砒砂巖與沙按不同的體積比配制復(fù)配土,采用拉曼光譜儀測試復(fù)配土粉末的拉曼光譜;根據(jù)復(fù)配土中化學(xué)成分SiO2在拉曼位移為464cm-1處的特征峰峰位隨砒砂巖含量的變化,研究了土體顆粒膠結(jié)作用力的變化。結(jié)果表明:沙的峰位為464.5cm-1,隨著砒砂巖含量增加,峰位逐漸減小;這是因?yàn)樯持信皫r的添加使得砒砂巖中的小顆粒占據(jù)了沙中部分大顆粒的位置,顆粒間的距離變大,顆粒間相互牽引而產(chǎn)生拉應(yīng)力,從而導(dǎo)致拉曼特征峰紅移;當(dāng)砒砂巖與沙的體積比為1…1時(shí),峰位減小到463.6cm-1;當(dāng)砒砂巖與沙的體積比為7…5時(shí),土體結(jié)構(gòu)發(fā)生坍塌,變得緊實(shí),土體顆粒之間產(chǎn)生了壓應(yīng)力,導(dǎo)致峰位突然增大到464.2cm-1,之后土體結(jié)構(gòu)趨于穩(wěn)定;隨著砒砂巖含量進(jìn)一步增加,仍有砒砂巖小顆粒對沙大顆粒的置換作用,導(dǎo)致拉應(yīng)力逐漸明顯,峰位不斷減小,當(dāng)復(fù)配土為全砒砂巖時(shí)峰位為463.1cm-1。實(shí)驗(yàn)結(jié)果證實(shí)了可將SiO2分子拉曼光譜特征峰峰位的移動用于研究復(fù)配土顆粒間的膠結(jié)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.
【作者單位】： 陜西省土地工程建設(shè)集團(tuán)有限責(zé)任公司;陜西地建土地工程技術(shù)研究院有限責(zé)任公司;國土資源部退化及未利用土地整治工程重點(diǎn)實(shí)驗(yàn)室;陜西省土地整治工程技術(shù)研究中心;
【基金】：陜西省重點(diǎn)科技創(chuàng)新團(tuán)隊(duì)計(jì)劃(2016KCT-23)
【分類號】：O657.37;S152
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本文編號：1654045