弥散裂缝模型在盾构管片非线性数值模拟中的适用性分析  

Applicability study on smeared crack model in nonlinear numerical simulation of shield tunnel lining

作　　者：谢家冲 王金昌[1] 林志军 李俊 陈页开[3] XIE Jiachong;WANG Jinchang;LIN Zhijun;LI Jun;CHEN Yekai(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China;Power China Huadong Engineering Corporation Limited,Hangzhou 311122,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]浙江大学建筑工程学院,浙江杭州310058 [2]中国电建集团华东勘测设计研究院有限公司,浙江杭州311122 [3]华南理工大学土木与交通学院,广东广州510640

出　　处：《新型建筑材料》2021年第9期30-35,40,共7页New Building Materials

基　　金：广东省自然科学基金项目(2018A0303130150);浙江省公路管理局科技计划项目(2018H18)。

摘　　要：为了准确获得盾构管片的开裂行为,选择合适的混凝土裂缝模型和参数是关键。基于已有管片试验成果建立了有限元模型,针对管片跨中挠度曲线、钢筋应变曲线和管片开裂模式等结构响应验证了数值模型的可靠性。参数分析研究了旋转裂缝模型、固定裂缝模型和多向固定裂缝模型3种弥散裂缝模型带来的影响,计算结果表明:旋转裂缝模型结果能够还原管片屈服后跨中的位移响应,同时裂缝形态与试验结果具有一致性。另外,针对拉伸和压缩断裂能进行参数敏感性分析,结果表明,2种断裂能都对管片承载力影响较大,源于规范Fib Model Code 2010的断裂能取值办法在管片开裂分析中的有效性得到验证。An appropriate concrete crack model and parameters should be selected when a precise crack behavior of shield tunnel lining was wanted.Based on the results of lining bearing test,a numerical model was built and its reliability was confirmed.The deflection curve at mid span,strain curve of steel bar and crack pattern were considered in the verification process.Three smeared crack models including rotating crack model,fixed crack model and multi-directional fixed crack model were considered in parameter analysis.The results show that the rotating crack model matched well with the test in deflection response and crack pattern.Besides,fracture energy of tension and compression were considered in sensitive analysis.It turns out that both two fracture energies have great impact on bearing capacity of tunnel segment.And parameter evaluation of fracture energy from standard Fib Model Code 2010 in the analysis of segment cracking has been verified.

关 键 词：盾构管片 混凝土开裂 结构非线性 弥散裂缝 极限承载力 

分 类 号：TU528.01[建筑科学—建筑技术科学]