摘要
目前混凝土衬砌隧洞抗震设计主要采用拟静力法,存在无法考虑地震动作用对衬砌隧洞的影响。为了分析混凝土衬砌后的土质隧洞动力响应,采用有限元强度折减法对某土质深埋衬砌隧洞进行了动力计算。结果表明:①在地震作用下,抗震性差的衬砌隧洞周围土体单元塑性区向45°发展,在隧洞破坏时塑性区范围不断增大,而抗震性能较好的衬砌隧洞周围土体塑性区在地震时程中变化不大。②在地震作用下,衬砌及周围土体出现应力集中现象,且随着地震时程的延长,应力集中范围逐渐增大。隧洞位移最大点出现在底拱和两拱脚位置。衬砌应力集中现象出现在顶拱和两侧拱脚处,周围土体应力集中主要分布在顶拱及底拱处。
At present , the seismic design of concrete lining tunnels mainly adopts the pseudo-static method , but there is a problem that the influence of ground motion on the lining tunnel cannot be considered. In order to calculate the dynamics of a soil-buried deep lining tunnel , the finite element strength reduction method was used. The results show that : a ) under the action of earthquake , the plastic zone of the soil unit around the lining tunnel with poor earthquake resistance develops to 45°, and the plastic zone continues continuously during the tunnel failure. The soil plastic zone around the lining tunnel with better seismic performance has little change during the seismic time history. b ) under the action of earthquake , stress concentration occurs in the lining and surrounding soil , and the stress concentration range increases gradually with the increase of seismic time history. The maximum displacement of the tunnel appears at the bottom arch and the two arches. The lining stress concentration phenomenon appears in the top arch and the arches on both sides , and the stress concentration around the soil is mainly distributed in the top arch and the bottom arch.
作者
刘灿
吴志强
LIU Can;WU Zhiqiang(Gansu Provincial Water Resources and Hydropower Survey and Design Institute Co.,Ltd.,Lanzhou 730000,China;Nanjing Hydraulic Research Institute,Nanjing 210024,China)
出处
《人民黄河》
CAS
北大核心
2019年第3期123-126,130,共5页
Yellow River
基金
国家自然科学基金面上项目(51879166)
中央级公益性科研院所基本科研业务费项目(Y318011)
关键词
土质隧洞
混凝土衬砌
稳定
有限元强度折减法
soil tunnel
concrete lining
stability
finite element strength reduction method
