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鲁北黄泛平原工程地质属第四纪黄泛冲积物,其土层结构主要以轻亚粘土和亚粘土互层为主,间接夹有粘土或细砂层,由于地下水位较高,土层多处于饱和状态,粘土夹层则处于流塑或软塑状态。其轻亚粘土的粘粒含量较少,一般为6～9％,均不超过13％,所以黄泛土层的结构还是比较简单的。为此,我们收集了大量的黄泛冲积土的土工试验原始数据,试图找出轻亚粘土与亚粘土物性指标和力学性指标的一些相关关系,对这两种土质的近300个土样的试验数据进行了整理分析计算,并绘制了一些相关性曲线,发现只有土的孔隙率与干密度的关系线呈良好的线性关系。我们运用数理统计方法计算出了孔隙率(孔隙比)与干密度的经验公式。这样,利用这个经验公式,只要测定出土样的干密度,即可快速计算出土的孔隙率。1.轻亚粘土的孔隙率与干密度的相关性分析 土壤的孔隙率是土力学中经常用到的一个重要的特性指标,工程上常用孔隙率的大小来评价土在天然状态下的紧密程
The engineering geology of the Yellow River Plain in the north of Shandong Province belongs to Quaternary yellow-pan alluvium. The soil layer structure is mainly composed of interlayered layers of light-loam and sub-clay with clays or fine sand layers indirectly. Due to the high groundwater level, Mostly in saturation, the clay interlayer is in a plastic or soft plastic state. The clay content of its light-loamy clay is less, usually 6 ~ 9%, no more than 13%, so the structure of the yellow-pan soil is relatively simple. To this end, we collected a large amount of raw data from the geotechnical test of yellow-pan alluvial soil and tried to find some correlations between the physical and mechanical properties of light-loamy clay and sub-clay. Nearly 300 soil samples of these two soil types The experimental data were analyzed and calculated, and some correlation curves were drawn. It was found that only the relationship between soil porosity and dry density showed a good linear relationship. We used mathematical statistics to calculate the porosity (porosity ratio) and dry density empirical formula. In this way, using this empirical formula, as long as the unearthed sample of dry density, you can quickly calculate the porosity of the soil. 1. Analysis of the Correlation between Porosity and Dry Density of Light-loam Clay The porosity of soil is an important characteristic index commonly used in soil mechanics. The commonly used porosity in engineering is used to evaluate the tightness of soil in its natural state