摘要
用MIDAS GTS/NX建立模型对沈阳地铁隧道开挖过程数据进行有限元数值模拟,所得结果与实测数据相似度较高,证明模型符合要求。按照实际施工方案对有限元模型进行中隔墙拆除,二次支护后进行动力模拟,研究隧道在不同条件下的震动响应:同一种地震波下改变不同的激震方向并运用不同振型的波对隧道进行激震找到在地震中隧道的薄弱点,即在地震中最先破坏的部位;改变隧道衬砌的厚度以及改变施做衬砌所用混凝土的等级来改变衬砌的刚度,得出不同衬砌的刚度在地震中对隧道的影响,从而总结出衬砌刚度对隧道影响规律。结果表明:同一种地震波下,有限元模型在不同激震方向上施加荷载,平行于隧道方向激震时的衬砌位移大于垂直于隧道激震时的衬砌位移;随着衬砌等级的增加,衬砌位移减小,最大主应力增大;随着衬砌刚度的提高,位移减小的速率小于主应力增大的速率,最大主应力增大。
MIDAS GTS/NX is used to build a model to simulate the process of tunnel excavation in Shenyang subway.Compared with the actual measured data,the comparative results have a higher similarity,which can prove that the model meets the requirements.According to the actual construction scheme of the finite element model the middle wall is removed,with secondary support and dynamic simulation,to change the parameters and to study the tunnel under different conditions of the vibration response.By changing different excitation directions under the same wave and different vibration modes to shock the tunnel,the shortcomings of the tunnel in the earthquake are found,i.e.,the first damaged part in the earthquake.By changing the thickness of the lining and the grade of the concrete the rigidity of the lining is changed.The influence of different rigidity of the lining on the tunnel in the earthquake is obtained,and the influence law of the rigidity of the lining on the tunnel is summarized.The results show that under the same seismic wave,the lining displacement of the finite element model under different excitation directions is greater than that under the tunnel excitation direction.With the increase of lining grade,the lining displacement decreases and the maximum principal stress increases.With the increase of lining stiffness,the rate of displacement decrease is less than the rate of principal stress increase,and the maximum principal stress increases.
作者
李兵
李高科
田立明
LI Bing;LI Gao-ke;TIAN Li-ming(School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,China)
出处
《桂林理工大学学报》
CAS
北大核心
2022年第3期616-621,共6页
Journal of Guilin University of Technology
基金
国家自然科学基金国家重大科研仪器研制项目(52027811)
辽宁省重点研发计划项目(2019JH8/10100099)
辽宁省教育厅面上项目(LJKZ0568)
沈阳市科技计划项目(20-206-4-13)。
关键词
隧道开挖
现场监测
数值分析
地震波
衬砌
tunnel excavation
on-site monitoring
numerical analysis
seismic wave
lining
