Coupled pore pressure analysis of cone penetration test in two-layered clay

IF 1.5 4区 工程技术 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS
Zhuofeng Li, Shide Mo, Kaiwen Yang, Yunmin Chen
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引用次数: 0

Abstract

Purpose

The paper aims to clarify the distribution of excess pore pressure during cone penetration in two-layered clay and its influence on penetrometer resistance.

Design/methodology/approach

An arbitrary Lagrangian–Eulerian scheme is adopted to preserve the quality of mesh throughout the numerical simulation. Simplified methods of layered penetration and coupled pore pressure analysis of cone penetration have been proposed and verified by previous studies. The investigation is then extended by the present work to study the cone penetration test in a two-layered clay profile assumed to be homogeneous with the modified Cam clay model.

Findings

The reduction of the range of pore pressure with decreasing PF will cause a decrease of the sensing distance. The PF of the underlying soil is one of the factors that determine the development distance. The interface can be obtained by taking the position of the maximum curvature of the penetrometer resistance curve in the case of stiff clay overlying soft clay. In the case of soft clay overlying stiff clay, the interface locates at the maximum curvature of the penetrometer resistance curve above about 1.6D.

Research limitations/implications

The cone penetration analyses in this paper are conducted assuming smooth soil-cone contact.

Originality/value

A simplified method based on ALE in Abaqus/Explicit is proposed for layered penetration, which solves the problem of mesh distortion at the interface between two materials. The stiffness equivalent method is also proposed to couple pore pressure during cone penetration, which achieves efficient coupling of pore water pressure in large deformations.

两层粘土中锥入度试验的耦合孔隙压力分析
目的 本文旨在阐明两层粘土中锥体贯入过程中过剩孔隙压力的分布及其对贯入阻力的影响。设计/方法/途径 采用任意的拉格朗日-欧勒方案,以保持整个数值模拟过程中的网格质量。之前的研究已经提出并验证了分层贯入和锥体贯入耦合孔隙压力分析的简化方法。本研究对这一研究进行了扩展,利用修正的卡姆粘土模型对假设为均质的两层粘土剖面中的锥入试验进行了研究。下层土壤的 PF 是决定开发距离的因素之一。在硬质粘土覆盖软质粘土的情况下,可以通过测量渗透仪阻力曲线最大曲率的位置来获得界面。在软质粘土覆盖在硬质粘土上的情况下,界面位于贯入度阻力曲线的最大曲率处,高于约 1.6D。还提出了刚度等效法来耦合锥入过程中的孔隙压力,实现了大变形情况下孔隙水压力的有效耦合。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Engineering Computations
Engineering Computations 工程技术-工程:综合
CiteScore
3.40
自引率
6.20%
发文量
61
审稿时长
5 months
期刊介绍: The journal presents its readers with broad coverage across all branches of engineering and science of the latest development and application of new solution algorithms, innovative numerical methods and/or solution techniques directed at the utilization of computational methods in engineering analysis, engineering design and practice. For more information visit: http://www.emeraldgrouppublishing.com/ec.htm
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