地震荷载作用下带裂纹重载铁路隧道的动态断裂  

Dynamic Fracture of Heavy Haul Railway Tunnels with Cracks Under Seismic Loads

作　　者：刘淑红 郑宝瑞 胡青华 LIU Shuhong;ZHENG Baorui;HU Qinghua1(D Department of Engineering Mechanics,Shijiazhuang Tiedao Unive rsity ,Shijiazhuang050043 ,Hebei,China;The Key Laboratory for Hecdth Monitoring and Control of Large Structures of Hebei Province, Shijiazhuang000043,Hebbei,China;Hebei Research institute of Construction & Geotechriccd Investigation C o.Ltd ,Shijiazhuang000031,Hebei,C hina)

机构地区：[1]石家庄铁道大学工程力学系,河北石家庄050043 [2]河北省大型结构健康诊断与控制实验室,河北石家庄050043 [3]河北建设勘察研究院有限公司,河北石家庄050031

出　　处：《地震工程学报》2018年第1期1-5,共5页China Earthquake Engineering Journal

基　　金：河北省自然科学基金(A2015210089);河北省高等学校科学技术研究重点项目(ZD2015101)

摘　　要：在隧道的施工和运营中,隧道衬砌不可避免会产生裂纹。裂纹和地震荷载的相互作用将加剧隧道的破坏,因此研究带裂纹隧道衬砌地震荷载作用下的破坏具有重要的意义。为了证明本文二维有限元数值模拟计算结果的正确性,首先用相互作用积分的方法计算动载作用下的静态裂纹,并与解析解进行比对,发现二者的吻合性很好。计算结果表明相互作用积分法可以用来精确地计算动载作用下带裂纹结构的动应力强度因子。用这种经过验证的方法来计算带裂纹重载铁路隧道衬砌的动应力强度因子和动承载力安全系数,可以看出在地震荷载作用下,I型裂纹的动应力强度因子在隧道结构的安全中起控制作用。当裂纹的长度大于某特定值时,隧道处于很危险的状态。Tunnel damage is aggravated by the interaction between cracks and earthquake loading.T h u s,the study of the dynamic fracture of tunnel lining with cracks under earthquake loading isof great importance.In this study,the correctness of the simulated results was calculated by thetwo-dimensional finite element method,while the dynamic stress intensity factors for a plate witha stationary crack under dynamic loads were first computed by the interaction integral method.The numerical results were then compared to the analytical solutions,with whom they werefound to be in good agreement.The computational results showed that the interaction integralmethod can be used to obtain accurate dynamic stress intensity factors for cracked structures underdynamic loads.Subsequently,the method was used to calculate the dynamic stress intensityfactors and the bearing capacity safety factors for the lining of heavy haul railway tunnels with cracks.The Xixian heavy haul railway tunnel located in the south-central area of the Shanxi Provincewas considered as a case study,with additional consideration given to twelve working conditions.A2D finite element model was established in order to compute the dynamic fracture of atunnel with cracks under earthquake loading.The results showed that under the seismic loads,the dynamic stress intensity factors of mode I cracks controlled the safety of the tunnel structure.Th ereb y,if the length of the crack was greater than a certain value,the tunnel was assessed as dangerous.

关 键 词：隧道 裂纹 地震荷载 动应力强度因子 有限元 

分 类 号：U441[建筑科学—桥梁与隧道工程]