黄泛区粉砂土静力特性的试验研究

Experimental Study on Static Character of the Silty Soil in the Yellow River Flooded Area

以河南开封地区粉砂土为研究对象,研究其静力特性,进行了固结试验、液塑限试验和直接剪切试验。试验结果表明,粉砂土的压缩系数为0.3 MPa-1,属中等压缩性土。粉砂土液限为15.3%,塑限为10.1%,塑性指数为5.2,属于含砂低液限粉土。粉砂土的内摩擦角为35.3°,黏聚力为7.5 kPa。并选取沙漠地区风积沙,及豫东平原区和南京地区广泛分布的黏性土为代表,与研究中黄泛区粉砂土的静力特性做比较。

The silty soil is a special type of soil spreading along the shores of Yellow River. The typical silty soil of Kaifeng in Henan province is adopted to test the static character. The compress,liquid limit,plastic limit and shear tests were carried out in the laboratory. Tested compression coefficient of the silty soil is 0. 3 MPa- 1; it is identified as neutral compressive soil. The liquid and the plastic limits are 15. 3% and 10. 1%,respectively. The plastic index is 5. 2,so the silty soil was identified as bearing sand silt of low liquid limit. And the friction angle is 35. 3°. Additionally,the static character of the silty soil,the aeolian sand,the clay in east of Henan and the clay in Nanjing area were compared.