黄土地区标准贯入试验研究

Research on Standard Penetration Test in Loess Regions

标准贯入试验在工程勘探中有举足轻重的地位,常被用来判定基础承载力及预测地基沉降,关乎建筑安全稳定。因此,了解标准贯入试验与土质基本物理指标间的相关性,对基础工程至关重要。文章针对黄土地区,通过标准贯入试验和室内试验,分析了标贯样与不扰动试样间含水率和干密度的变化规律,以及黄土地层标贯击数与地层干密度、含水率、塑性指数的相关性。结果表明,不扰动试样与标贯试样的含水率随深度增加波动幅度变大,而不扰动试样的干密度随深度增加波动幅度变小,标贯试样的干密度随深度增加整体幅度变大;黄土地层的标贯击数与干密度和塑性指数呈正相关,但与含水率呈负相关。试样结果可为后续工程勘探提供参考和依据。

Standard penetration test plays a crucial role in engineering exploration,often used to determine the bearing capacity of foundations and predict foundation settlement,which is related to the safety and stability of buildings.Therefore,understanding the correlation between standard penetration tests and basic physical indicators of soil is crucial for foundation engineering.The article is based on the loess region and analyzes the variation law of water content and dry density between standard penetration samples and undisturbed samples through standard penetration tests and indoor tests,as well as the correlation between the number of standard penetration blows in loess strata and the dry density,water content,and plasticity index of the strata.The results showed that the fluctuation amplitude of water content in undisturbed and standard penetration samples increased with depth,while the fluctuation amplitude of dry density in undisturbed samples decreased with depth.The overall amplitude of dry density in standard penetration samples increased with depth;The number of standard penetration tests in loess strata is positively correlated with dry density and plasticity index,but negatively correlated with water content.The sample results can provide reference and basis for subsequent engineering exploration.