JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE A 2018 Vol.19 No.8 P.624-637

Hypoplastic modeling of soil-structure interfaces in offshore applications

Author(s): Hans Henning Stutz, Frank Wuttke
Affiliation(s): Department of Engineering, Aarhus University, Aarhus 8000, Denmark; more
Corresponding email(s): hhs@eng.au.dk
Key Words: Hypoplasticity, Interfaces, Cyclic loading, Fine and coarse grained soils

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Abstract: Cyclic and monotonic loaded offshore structures (e.g. piles, pipelines, cables, and suction-buckets) must be designed and calculated considering the effects of the soil-structure interaction. An advanced constitutive soil model must be used, but a simplified Mohr-Coulomb friction law is applied for the soil-structure interface. The Mohr-Coulomb model is a simple bilinear friction model that cannot take into account monotonic and cyclic interface phenomena. These include hardening, softening, and stiffness degradation under loading. However, we propose two advanced hypoplastic interface models for fine- and coarse-grained soils with intergranular strain concept. The intergranular strain concept has been proven to be an efficient way to model the small-strain deformation and un/reloading behavior of soils. The intergranular strain concept is therefore used to enhance the prediction capabilities of the hypoplastic interface models. Differences of the recent model formulation compared with previous versions are presented and discussed based on simulation. This is followed by an application of different models in finite-element simulations. The new models are used to simulate cyclic direct shear interface tests. Furthermore, the advanced interface model is used for simulation of a torodial penetrometer penetration problem. Several aspects, which are particularly important for offshore structures, are compared with the simple Mohr-Coulomb friction model.

近海应用中土壤-结构界面的亚塑性模型

目的:研究一种使用连续的土壤模型模拟土壤-结构界面的新方法,并阐述这些模型增强土壤-结构相互作用的建模方法
创新点:1. 基于先前的亚塑性模型,通过将晶粒间应变的概念融入模型公式来模拟循环载荷. 2. 整体性较好的模型具有更好、更精确的模拟结果.
方法:1. 采用一种砂浆接触的力学方法,其中一个表面作为主面,另一个表面作为从属面. 2. 采用砂浆接触的力学方法并结合用户定义的子程序,对土壤-结构界面进行建模. 3. 基于先前的亚塑性模型,将晶粒间应变的概念融入模型公式来模拟循环载荷.
结论:1. 整体性较好的模型具有更好、更精确的模拟结果. 2. 本文提出的土壤-结构界面建模方法不仅提高了模拟结果,且在某些模拟中提高了数值收敛性.
关键词：亚塑性;接触面;循环荷载;细颗粒和粗粒土

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