This paper presents a new interpretation procedure to estimate the initial state parameter from cone penetration testing (CPTu) in undrained conditions based on the results from a comprehensive set of numerical simulations of CPTu in low permeability liquefiable soil. CPTu simulations are performed using the Particle Finite Element method, whereas the material response is modelled with CASM. The effects of soil constitutive parameters and roughness of the soil-steel interface are examined. It turns out that the numerical results are correctly summarized by an analytical relation derived from undrained cavity expansion results in critical state soils, as long as the constraints resulting from cone geometry are taken into account. The resulting adapted analytical formulation is notable for its simplicity and ease of use, comparing favorably with existing alternatives.

翻译：本文基于低渗透性可液化土中不排水条件下CPTu的全面数值模拟结果，提出了一种估算初始状态参数的新解释方法。CPTu模拟采用颗粒有限元法进行，而材料响应则通过CASM模型建模。研究了土体本构参数及土-钢界面粗糙度的影响。结果表明，只要考虑锥体几何形状带来的约束，数值结果可被临界状态土中不排水孔穴扩张结果导出的解析关系准确概括。由此推导的修正解析公式具有简洁易用的显著特点，并且优于现有替代方法。