摘要
运营隧道由于地质因素、施工因素与地下水因素造成衬砌结构带裂缝工作。在地震力作用下,带裂缝的衬砌的安全性难以保证。基于隧道衬砌结构裂损的不同位置和裂缝不同深度的考虑,建立了三维数值有限元模型,采用时程分析的方法研究了衬砌的动力响应。研究表明:①在地震力作用下,隧道衬砌受往复拉压作用;在剪切波作用下,最大弯矩、轴力发生在隧道横截面"X"位置;②带裂缝衬砌在地震力作用下,纵向裂缝处混凝土应力集中,主筋拉应力增大,其他位置内力与完好衬砌响应相同;③随着裂缝的位置不同,对隧道安全性的影响不同,影响顺序由大到小依次为225°、315°、270°;④衬砌初始裂缝深度越深,在地震作用下应力集中情况越严重。
Due to geological factors,construction factors and underground water,operational tunnel might work with lining cracks. When earthquake happens,lining with cracks would damage and influence its safety. Considering lining cracks at different positions and depths,three dimensional finite numerical model is developed,time history method is used to study the dynamic response of tunnel lining. The results show as follows. ①Under earthquake force,cyclic tensile and compressive force are acted on tunnel lining. Under the shear wave,maximum moment and axial force happen at the X position of the tunnel. ②Under earthquake force,lining with cracks will face stress concentration at the crack location. Stress of main steel would increase. Stress at the other positions are the same with the one with no crack. ③Different positions of cracks would have different influence to tunnel safety.The sequence of the influence is 225°,315°,and 270°. ④Deeper the initial cracks are,more severe the stress concentration are.
作者
王立忠
王海彦
黄黆
李永珑
WANG Li-zhong;WANG Hai-yan;HUANG Guang;LI Yong-long(Shijiazhuang Institute of Railway Technology,Shijiazhuang 050041,China;College Transportation Science&Engineering,Nanjing Tech University,Nanjing 210009,China;Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China)
出处
《科学技术与工程》
北大核心
2019年第28期325-332,共8页
Science Technology and Engineering
基金
河北省人才工程培养经费资助科研项目(A2017002037)
河北省科技厅重点研发计划自筹课题(17275509)
国家自然科学基金(51038009)资助
关键词
运营铁路隧道
裂损衬砌
强震
时程分析
动力响应
operation railway tunnel
lining cracks
strong earthquakes
time history analysis
dynamic response
