基于ABAQUS非线性本构模型的隧道初期支护结构安全性研究  

Research on the Safety of Tunnel Initial Support Structures Based on Nonlinear Constitutive Models in ABAQUS

作　　者：肖冰 XIAO Bing(School of Safety and Environment,Fujian Chuanzheng Communications College,Fuzhou 350007,Fujian,China)

机构地区：[1]福建船政交通职业学院安全与环境学院,福建福州350007

出　　处：《韶关学院学报》2024年第6期40-45,共6页Journal of Shaoguan University

基　　金：福建省交通运输科技项目(闽交科教[2022]8号);福州机场第二高速公路A4合同段绿色公路与科技创新专项技术服务项目(4GS-FZJC-0618-2023-0006)。

摘　　要：隧道工程中,准确评估初期支护结构安全性在其动态设计阶段至关重要.以云南某高速公路隧道的Ⅴ级围岩无仰拱初支结构为例,采用ABAQUS软件构建初支结构三维精细化模型,运用混凝土非线性本构关系进行了分析,以评估初期支护的极限位移量、极限承载力及隧道潜在的失稳状态.结果表明:初支结构在受力时主要表现为拱顶内侧受拉、外侧受压,拱肩内侧受压、外侧受拉,以及拱脚内侧受拉、外侧受压;围岩初期支护在整体上呈现出拱顶下沉和两侧拱肩向外扩张的变形特征,边墙的位移收敛值相对较小;采用非线性本构能够有效地模拟出结构截面在塑性铰形成、刚度降低和内力重分布等过程.因此建议采用非线性本构模型进行初期支护结构的安全性评价.研究对于提高隧道工程的设计水平和保障工程安全具有重要意义和实践价值.In tunnel engineering,it is crucial to accurately assess the structural safety of the initial support in its dynamic design stage.Taking the primary support structure of a Grade V surrounding rock structure without invert support of a highway tunnel in Yunnan as an example,the three-dimensional refinement model of the primary support structure was constructed by ABAQUS software,and the analysis was carried out by using the nonlinear constitutive relationship of concrete in order to assess the ultimate displacement,ultimate bearing capacity of the initial support and the potential instability state of the tunnel.The results showed that:the initial support structure was mainly subjected to tensile force on the inner side of the arch and compression on the outer side,compression on the inner side of the arch shoulder and tensile force on the outer side,as well as tensile force on the inner side of the arch and compression on the outer side of the arch foot;the peripheral rock initial support shows the deformation characteristics of the arch sinking and the outward expansion of arch shoulder on both sides,and the displacement of the sidewalls has a relatively small value of convergence;the use of nonlinear constitutive relationship can effectively simulate the process of the structure section in the process of the formation of plastic hinges,the reduction of stiffness and the redistribution of internal forces.The use of nonlinear constitutive can effectively simulate the process of plastic hinge formation,stiffness reduction and internal force redistribution.Therefore,it is recommended to use the nonlinear constitutive model to evaluate the safety of the initial support structure.The study is of great theoretical significance and practical value for improving the design level and ensuring the safety of tunnelling projects.

关 键 词：公路隧道 初期支护 非线性本构 三维精细化模型 安全性研究 

分 类 号：U459.2[建筑科学—桥梁与隧道工程] U455.7[交通运输工程—道路与铁道工程]