A cavity expansion–based solution is proposed in this paper for the interpretation of CPTu data under a partially drained condition. Variations of the normalized cone tip resistance, cone factor, and undrained‐drained resistance ratio are examined with different initial specific volume and overconsolidation ratio, based on the exact solutions of both undrained and drained cavity expansion in CASM, which is a unified state parameter model for clay and sand. A drainage index is proposed to represent the partially drained condition, and the critical state after expansion and stress paths of cavity expansion are therefore predicted by estimating a virtual plastic region and assuming a drainage‐index–based mapping technique. The stress paths and distributions of stresses and specific volume are investigated for different values of drainage index, which are also related to the penetration velocity with comparisons of experimental data and numerical results. The subsequent consolidation after penetration is thus predicted with the assumption of constant deviatoric stress during dissipation of the excess pore pressure. Both spherical and cylindrical consolidations are compared for dissipation around the cone tip and the probe shaft, respectively. The effects of overconsolidation ratio on the stress paths and the distributions of excess pore pressure and specific volume are then thoroughly investigated. The proposed solution and the findings would contribute to the interpretation of CPTu tests under a random drained condition, as well as the analysis of pile installation and the subsequent consolidation.

中文翻译：

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一种基于空腔扩展的解决方案，用于解释部分排水条件下土壤中的 CPTu 数据

本文提出了一种基于腔扩展的解决方案，用于解释部分排水条件下的 CPTu 数据。基于统一状态参数CASM中不排水和排水空腔膨胀的精确解，研究了不同初始比容和过固结比下归一化锥尖阻力、锥体系数和不排水阻力比的变化用于粘土和沙子。提出了排水指数来表示部分排水条件，因此通过估计虚拟塑性区域并假设基于排水指数的映射技术来预测膨胀后的临界状态和空腔膨胀的应力路径。研究了不同排水指数值下的应力路径和应力分布和比容，通过比较实验数据和数值结果，这也与穿透速度有关。因此，在超孔隙压力消散期间假设偏应力恒定，预测渗透后的后续固结。分别比较了球形和圆柱形固结在锥尖和探头轴周围的耗散。然后彻底研究了超固结比对应力路径以及超孔隙压力和比容分布的影响。提议的解决方案和结果将有助于解释随机排水条件下的 CPTu 测试，以及分析桩安装和随后的固结。