深厚软土地层标准贯入试验杆长校正方法研究

Research on the Method of Rod Length Correction for Standard Penetration Test in Deep Soft Soil Layers

为研究标准贯入试验在深埋软土地层中的杆长校正方法,以昆明某试验场地中的代表土层为研究对象,利用ABAQUS有限元软件在Mohr-Coulomb本构关系基础上构建了三维实体模型,分析了深厚软土地层标准贯入过程中的土层及贯入器的应力和变形分布情况,并提出杆长校正系数的计算公式,对比75m杆长范围内计算公式与现有国家和地方规范的差异,验证了本次杆长校正系数计算结果的准确性。

In order to study the rod length correction method of standard penetration test in deep buried soft soil layers,this paper takes the representative soil layer in a test site in Kunming as the research object.It constructed a three-dimensional solid model based on the Mohr Coulomb constitutive relationship using ABAQUS finite element software.This article analyzes the stress and deformation distribution of soil layers and penetrators during the standard penetration process in deep soft soil layers,and proposes a calculation formula for the pole length correction coefficient.The difference between the calculation formula within a 75m pole length range and existing national and local regulations is compared to verify the accuracy of the pole length correction coefficient calculation results.