叠合式套拱加固组合梁模拟技术研究  

Simulation Technology for Superimposed Cover-Arch Reinforcement Based on Composite Beams

作　　者：刘学增[1,2] 刘新根 桑运龙 刘文艺 

机构地区：[1]同济大学土木信息技术教育部工程研究中心,上海200092 [2]上海同岩土木工程科技股份有限公司,上海200092 [3]上海地下基础设施安全检测与养护装备工程技术研究中心,上海200092

出　　处：《现代隧道技术》2017年第6期136-142,共7页Modern Tunnelling Technology

基　　金：国家自然科学基金(51478342)

摘　　要：基于公路隧道叠合式套拱加固的受力特性和刚度等效原则,文章对衬砌和套拱加固结构截面特征参数进行了组合修正,并探讨了组合截面梁单元的内力分配方法。利用共享节点的组合梁单元模拟衬砌与套拱的组合结构,分析结果可直接输出衬砌、套拱及组合体的内力值,数值验证算例及其与解析解、ANSYS解的比较表明了计算模型的可行性和正确性。依托实际公路隧道工程,利用组合梁模拟技术,进行了有限元分析,分析结果证实了基于组合截面梁分析的叠合式套拱加固效果评价的合理性、直观性,并对类似隧道加固方法效果评价具有一定的参考价值。Based on the force characteristics of reinforcement by a superimposed cover arch and the rigidity equivalent theory for highway tunnels, parameters are combined and modified for section characteristics of the lining and cover-arch reinforced structure, and the internal force distribution method of a compound section in a beam element is discussed. The composite structure of the lining and superimposed cover arch are simulated using composite beam elements with a sharing node, and the output of the internal force values of lining, cover arch and composite structure are determined by the analysis results. The feasibility and correctness of the calculation model is verified by comparing the numerical validation example, the analytic solution and the ANSYS solution. Based on actual high- way tunnel engineering, a finite-element analysis is conducted using composite-beam simulation technology, and the analysis results confirm that the effects of a superimposed cover-arch reinforcement based on composite-beam analysis is rational and intuitive, providing a reference for evaluating the reinforcement effects of similar projects.

关 键 词：叠合式套拱 隧道加固 组合截面 梁单元 数值模拟 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]