循环荷载下加筋土黏弹塑力学模型与数值分析

匡希龙^{1, 2}，周志刚¹，李雨舟¹

(1. 长沙理工大学 公路工程教育部重点实验室，湖南 长沙，410014；2. 长沙学院 土木系，湖南 长沙，410003)

摘 要：为进一步揭示黏弹塑性模型比以往的黏弹性模型更能合理反映循环荷载作用下加筋土的力学响应特性，将筋材当作黏弹性材料，视土体为弹塑性材料，把国内外已有的3个参数(E₁，E₂，η)黏弹性模型拓展成了6个参数(E₁，E₂，E₃，η₂，η₃，σ_s)的黏弹塑性模型。在ANSYS10.0环境下进行2次开发得到的理论值与土工离心模型实验得到的实测值进行对比，其误差比黏弹性模型减少8%以上，在一致性方面也明显比黏弹性模型要好。表明本文构建的黏弹塑性模型全面揭示了通车后的加筋土路基在车辆的反复碾压下所具有的黏弹塑性材料全部特征。

关键词：加筋土；循环荷载；黏弹塑性；二次开发；数值分析；土工离心模型

Viscoelast-oplasticity model and numerical analysis of reinforcement engineering under cycle load

KUANG Xilong^{1, 2}, ZHOU Zhigang¹, LI Yuzhou¹

(1. Key Laboratory of Highway Engineering of Ministry of Education,Changsha University of Science and Technology, Changsha 410014, China;2. Department of Civil Engineering, Changsha Institute, Changsha 410003, China)

Abstract:In order to reveal the mechanical deformation responding of reinforcement engineering of viscoelast-oplasticity model by comparing viscoelasticity model under cycle load, the viscoelasticity model of three parameters (E₁, E₂, η) was changed into the viscoelast-oplasticity model of six parameters (E₁, E₂, E₃, η₂, η₃, σ_s), on the basis of idea that geosynthetics was regarded as viscoelasticity material and the soil was treated as elastoplasticity material. The error of viscoelast-oplasticity model was reduced by 8% and the consistency is better than viscoelasticity model, between when comparing theoretical values from secondary development under ANSYS10.0 and measured values from geotechnical centrifuge modeling test. It is revealed that the viscoelast-oplasticity model can reflect all features of viscoelast-oplasticity material of reinforcement engineering under rolling repeatedly by vehicle.

Key words:reinforcement engineering; cycle load; viscoelast-oplasticity; secondary development; numerical analysis; geotechnical centrifuge modeling