摘要
为研究某深埋隧道在开挖过程中的应力和位移分布规律,利用ABAQUS有限元软件并结合摩尔库伦理论建立隧道二维有限元模型,通过生死单元法模拟了隧道上下台阶法施工过程,分析了隧道在开挖过程中的应力和位移的变化规律,并预估可能发生的工程危害。研究结果表明:隧道拱顶、拱脚处受力比较大,易发生开裂破坏;隧道拱顶及拱腰处塑性应变较大,该处围岩易发生屈服破坏;隧道拱顶处的变形最大,衬砌在施工过程中容易发生失稳、塌陷等破坏;隧道拱脚出现明显的塑性损伤现象。通过上述分析,以期对深埋隧道开挖施工具有一定的指导价值。
In order to study the stress and displacement distribution of a deep-buried tunnel during excavation,a two-dimensional finite element model of the tunnel was established using ABAQUS finite element software and Mohr Coulomb Theory.The construction process of the tunnel up and down steps was simulated by the method of element birth and death.The analysis of the stress and displacement changes of the tunnel during the excavation process,and the possible engineering hazards were estimated.The research results show that the tunnel vault and arch foot are relatively stressed,which is prone to cracking and failure;the tunnel vault and arch waist are subject to large plastic strain,where the surrounding rock is prone to yield failure;and the tunnel vault has the largest deformation.During the construction process,the lining is prone to instability,collapse and other damage;the tunnel arch foot has obvious plastic damage.Through the above analysis,it is expected to have a certain guiding value for the excavation and construction of deep buried tunnels.
出处
《科技创新与应用》
2020年第13期6-10,共5页
Technology Innovation and Application
关键词
深埋隧道
数值模拟
摩尔库伦
生死单元
应力
位移
deep buried tunnel
numerical simulation
Mohr-Coulomb
element birth and death
stress
displacement
