地震工程学报2017，Vol.39Issue(6)：1029-1036,8.DOI:10.3969/j.issn.1000-0844.2017.06.1029
基于强度折减法的隧道洞口段地震稳定性研究
Study on Seismic Stability of a Tunnel Portal Section based on the Strength Reduction Method
摘要
Abstract
Recently,the strength reduction method (SRM)has gained importance in static and dynamic fields of Geotechnical Engineering.Based on this method,the dynamic safety factor of slopes and tunnels has been studied by scholars.As a complicated 3-dimensional structure,the tunnel portal section is part-ly influenced by the interaction between the surrounding rock,slope,and lining of the structure.Seismic stability research is now mostly conducted for qualitative descriptions.To evaluate the dynamic stability of such projects and provide references for design and construction,quantitative indexes should be devel-oped.According to the shaking table test,a numerical model of a 3-dimensional tunnel portal section is built,in which the SRM is adopted to acquire a dynamic safety factor of this section.In this study,the plastic energy criteria (PEC)combined with the catastrophe theory (CT)is used as the failure judgment of the model in deciding the safety factor.Using the CT,the critical changing point of the reduction fac-tor-plastic energy curve is decided.The safety factor of the model then becomes the reduction factor at this critical point.Results show that the PEC combined with the CT have a small error and exhibit the advantages of simplicity and convenience compared with other failure criterion such as displacement crite-rion,non-convergence criterion and the criterion of plastic zone connection.The dynamic safety factor of the model is smaller than the static safety factor,which is in accordance with the law that structures ex-hibit lower stability under dynamic loading.The dynamic safety factor is 1.52 for the model,indicating that the portal section in simulating is rather stable,which agrees with the shaking table test results.The results show that the PEC combined with the CT is feasible in such engineering cases,which could pro-vide reference for similar projects.关键词
隧道洞口段/地震稳定性/强度折减法/突变理论/塑性应变能判据Key words
tunnel portal section/seismic stability/strength reduction method/catastrophe theo-ry/plastic energy criteria分类
建筑与水利引用本文复制引用
赵旭,华成亚,赵密,周红星,牛犇..基于强度折减法的隧道洞口段地震稳定性研究[J].地震工程学报,2017,39(6):1029-1036,8.基金项目
国家自然科学基金(41672289) （41672289）
国家973计划项目(2015CB057902) （2015CB057902）
中交交通基础工程环保与安全重点实验室资助 （）
