黄土标贯击数与物理力学参数相关性及微观机制分析

为了补充西安市黄土塬区利用标贯击数预测土的物理力学参数的方法，以西安市长安区黄土塬地基土为例，通过现场标贯试验和室内土工试验，对地基土的标贯击数值与物理力学参数进行了一元和多元相关性分析，给出了拟合关系式及其相关系数；并利用电镜扫描及PCAS图像处理技术，从黄土微观结构角度对研究结果做了进一步分析。结果表明：黄土塬地基土的含水率、干密度、孔隙比、液限、黏聚力、内摩擦角、压缩系数均与标贯击数N有很好的线性相关性，地基土的湿陷系数与标贯击数N的线性相关性良好，可用N值对地基土的物理力学参数进行预测。研究成果可为西安黄土塬区岩土工程勘察提供参考。

Correlation between SPT blow counts and physical and mechanical parameters of loess and analysis of microscopic mechanism

In order to supplement the method of using standard penetration tests to predict the physical and mechanical parameters of soil in the Loess Plateau area of Xi''an City, taking the loess plateau foundation soil in Chang"an District, Xi"an City as an example, through on-site standard penetration tests and indoor geotechnical tests, the one-dimensional and multivariate correlation analysis was conducted on the standard penetration number N value of the foundation soil and its physical and mechanical parameters, and the fitting relationship formula and correlation coefficient were provided; Further analysis was conducted on the research results from the perspective of loess microstructure using electron microscopy scanning and PCAS image processing technology. The results show that the moisture content, dry density, void ratio, liquid limit, cohesion, internal friction angle, and compression coefficient of the loess plateau foundation soil have a good linear correlation with the number of standard penetration tests N, and the linear correlation between the collapsibility coefficient of the foundation soil and the number of standard penetration tests N is good. The N value can be used to predict the physical and mechanical parameters of the foundation soil. The research results can provide reference for geotechnical investigation in Xi"an loess plateau area.