标贯试验在石家庄湿陷性黄土承载力评价中的应用

Application of Standard Penetration Test in Bearing Capacity Assessment of Collapsible Loess in Shijiazhuang

摘要:

由于湿陷性黄土在施工过程中极易引发地面塌陷、不均匀沉降、裂缝等现象，因此，关于湿陷性黄土地基承载力的测定，具有切实可行的工程实际指导意义。以石家庄市某快速连通工程勘察数据为基础，系统阐述了标准贯入试验的技术原理，重点分析了其在湿陷性黄土地层承载力评价中的应用效果，并通过158组试验数据推导出了适合于石家庄地区湿陷性黄土标贯击数N与地基承载力特征值f_ak的经验关系。研究成果可为石家庄地区湿陷性黄土区地基承载力的评定提供技术参考。

Abstract:

Due to the fact that collapsible loess is highly prone to ground collapse, uneven settlement, cracks and other phenomena during the construction process, the determination of the bearing capacity of collapsible loess foundation has practical and feasible guiding significance for engineering. Based on the survey data of a rapid connection project in Shijiazhuang City, the technical principles of the standard penetration test (SPT) are systematically expounded, and the focus is on analyzing its application effectiveness in evaluating the bearing capacity of collapsible loess strata. Through 158 sets of experimental data, an empirical relationship between the SPT blow count (N) and the characteristic value (f??) of foundation bearing capacity suitable for collapsible loess in the Shijiazhuang area is derived. The research achievement can provide a technical reference for assessing the foundation bearing capacity in collapsible loess area in the Shijiazhuang region.