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Numerical study on undrained cone penetration in structured soil using G-PFEM
Computers and Geotechnics ( IF 5.3 ) Pub Date : 2021-03-01 , DOI: 10.1016/j.compgeo.2021.104061
Laurin Hauser , Helmut F. Schweiger

This paper presents a model for the numerical simulation of cone penetration in structured soil under undrained conditions based on the Particle Finite Element Method. An extended version of the Clay and Sand Model (CASM), allowing microstructural bonding and its degradation to be taken into account, was implemented into the application G-PFEM and compared to the analytical solution for undrained spherical cavity expansion. A robust model for cone penetration is obtained using a nonlocal stress-integration combined with the IMPLEX integration scheme. A parametric study on the shape of the yield surface – which is adaptable for the CASM – and the degree of initial bonding, as well as the rate of destructuration, was conducted to investigate the influence on the obtained normalized parameters Qt, BQ, U, and the cone factors Nkt, NΔu, Nke used for the determination of the undrained shear strength. It was found that the highest cone factors, leading to conservative estimations of the peak undrained shear strength, are obtained for unbonded material. Both, the shear strength and the tip resistance increase due to soil structure, however, Nkt and Nke are not significantly influenced as long as no destructuration takes place during penetration.



中文翻译:

基于G-PFEM的结构性土壤不排水锥渗透的数值研究

本文提出了一种基于颗粒有限元法的不排水条件下结构性土中锥入度数值模拟的模型。粘土和砂土模型(CASM)的扩展版本允许考虑微结构的结合及其降解,已在应用程序G-PFEM中实现,并与不排水球腔扩展的分析解决方案进行了比较。使用非局部应力积分与IMPLEX积分方案相结合,可以得到一个可靠的圆锥体渗透模型。对屈服面的形状(适用于CASM)以及初始键合度以及破坏率进行了参数研究,以研究对获得的归一化参数Q t,B Q的影响。,U和圆锥系数N ktNΔu,N ke用于确定不排水的剪切强度。已经发现,对于未结合的材料,可获得最高的锥度因子,从而导致对不排水峰强度的保守估计。剪切强度和抗尖端性均由于土壤结构而增加,但是,只要在渗透过程中不发生破坏,N kt和N ke不会受到显着影响。

更新日期:2021-03-02
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