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为了研究毛乌素沙地的砒砂岩、沙、砒砂岩与沙复配土(不同比例混合)的颗粒胶结作用力,采用拉曼光谱仪对砒砂岩和沙体积比分别为0:1,1:11,1:5,1:4,1:3,1:2,5:7,1:1,7:5,2:1,3:1,4:1,5:1,11:1,1:0的砒砂岩与沙复配土粉末进行拉曼光谱测试。根据复配土中化学成分SiO2在464 cm-1处的特征峰峰位随砒砂岩占复配土百分比含量的多少而发生移动的情形,研究土体颗粒胶结作用力的变化情况。结果显示:沙的峰位为464.5 cm-1,随着砒砂岩的加入,峰位逐渐减小,这是由于沙中砒砂岩的加入,使得砒砂岩的小颗粒代替沙的大颗粒,颗粒间距离变大,颗粒间相互牵引产生拉伸应力导致拉曼特征峰红移。砒砂岩和沙1:1时,峰位已减小到463.6 cm-1,然而随着砒砂岩含量的进一步增加,当砒砂岩和沙体积比为7:5时,已有很多砒砂岩小颗粒置换沙中的大颗粒,土体结构不稳而发生坍塌,变得紧实,土体颗粒之间产生压缩应力,导致峰位突然增加到464.2 cm-1,在此之后,土体结构趋于稳定,随着砒砂岩的进一步加入,继续完成小颗粒对大颗粒的置换,拉伸应力逐渐明显,峰位随着砒砂岩含量的增加再次不断减小,到全砒砂岩时峰位为463.1 cm-1。综上所述,本文证实了可将SiO2分子的拉曼光谱特征峰峰位的移动结果应用于对复配土土体颗粒间胶结作用力的研究。
In order to study the grain cementation force of sandstone, sandstone, sandstone and sand mixed soil (mixed with different proportions) in Mu Us sandy land, the volume ratio of sandstone to sand was 0: 1, 1: 11, 1 1, 2, 3: 1, 4: 1, 5: 1, 11: 1, 1: 0 Of the 砒 sand and sand mixed with soil powder Raman spectroscopy. According to the chemical composition of SiO2 in the soil at 464 cm-1 at the location of the peak position with the proportion of sandstone content of the proportion of mixed soil to move the situation to study soil particles cementation force changes. The results show that the peak position of sand is 464.5 cm-1. With the addition of 砒 sandstone, the peak position gradually decreases due to the addition of 砒 sandstone in the sand so that the small particles of 砒 sandstone replace the large particles of sand, The larger the distance between the particles pulling each other to produce tensile stress lead to Raman peak red shift. However, with the increase of the sandstone content, when the sandstone-sand ratio is 7: 5, many small sandstone particles have been replaced by sand In the middle of the large particles, the soil structure instability and collapse, become tight, compressive stress between the soil particles, resulting in a sudden increase to 464.2 cm-1 peak position, after which, the soil structure tends to be stable, With the further addition of 砒 sandstone, the substitution of small particles for large particles was continued, and the tensile stress gradually became clear. The peak position decreased again with the increase of 砒 sandstone content. The peak position of sandstone was 463.1 cm-1 . In summary, this paper confirms that the Raman shift of the Raman peak of SiO2 molecules can be used to study the intergranular cementing force of complex soil.