湖北省襄荆高速公路与汉十高速公路膨胀土膨胀特性的对比研究

COMPARATIVE STUDY ON SWELL SOIL IN XIANGJING AND HANSHI HIGHWAYS

摘要: 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50 kPa压力下饱水后的压缩沉降量基本上大于其膨胀量.
- 高速公路 /
- 膨胀土 /
- 工程特性 /
- X射线衍射分析 /
- 颗粒分析
Abstract: Swell dilatability is the main geological problem in Xiangjing and Hanshi highway project. By X-ray diffraction and grain analyses, higher contents of ascanite and illite were found in the former highway, but the content of quartz, feldspar and chlorite are found low. The swell dilatability in the two highway sites were the same, low or middle level, but the difference in the content of clay minerals resulted in the higher swell dilatability in Xiangjing highway site. Moreover, the sedimentation quantity in 50 kPa was larger than its dilatability.
- highway /
- swell soil /
- engineering character /
- X-ray diffraction analysis /
- grain analysis

图 1 膨胀土物质成分分布

Fig. 1. Composition distributions of swell soil

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图 2 粘粒(< 0.005 mm)的质量分数统计分布

Fig. 2. Statistical distribution of mass fractions of clay

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表 1 襄荆与汉十高速公路膨胀土膨缩指标对比

Table 1. Index comparison of swell soil in Xiangjing and Hanshi highways