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膨胀土的膨胀性是襄荆高速公路与汉十高速公路面临的重要工程地质问题 ,通过X射线衍射分析和颗粒分析试验 ,发现襄荆高速公路膨胀土体的蒙脱石和伊利石质量分数相对较高 ,而石英、长石和绿泥石质量分数较低 .两条高速公路的膨胀性为弱至中等 ,但是粘土矿物质量分数的差异导致了襄荆高速公路比汉十高速公路膨胀土体的膨胀性要高 ;汉十高速公路膨胀土在 5 0kPa压力下饱水后的压缩沉降量基本上大于其膨胀量 .
The expansibility of expansive soil is an important engineering geological problem facing Xiang-Jing Expressway and Han-Shi Expressway. The X-ray diffraction analysis and particle analysis test show that the mass fraction of smectite and illite in the expansive soil of Xiangjing Expressway is relatively High, while quartz, feldspar and chlorite have lower mass fraction.The expansibility of the two expressways is weak to medium, but the difference of clay mineral mass fraction leads to the expansion of expansive soil in Xiangjing Expressway than Han-Han-Shi Expressway The sex is high; the compressive settlement of expansive soil of Han-Shi Expressway after saturated with water at 50kPa is basically greater than its expansion.