【摘要】 应用有限元法并采用等效黏-弹性人工边界,对棚洞和隧道洞口段的施工过程进行了模拟,确定了隧道施工完成后的静应力场,并进行了三维地震反应分析。计算中分别考虑了不同围岩级别以及棚洞与隧道洞口的不同联接形式对地震反应的影响。计算结果表明:棚洞的纵梁距离洞口越远,其内力越小,在棚洞与隧道洞口的联接处附近,棚洞梁将产生较大的应力;围岩的力学指标越高,棚洞结构的内力越小;当棚洞结构横向一侧与围岩刚性联接时,隧道洞口与棚洞纵向采用刚性联接比采用柔性联接更有利。更多还原

【Abstract】 Based on FEM method,3-D seismic responses of the connection part of a tunnel and its shed-tunnel were performed by equivalent viscous-spring artificial boundary.The influence to the seismic response from different rock mass and Connection type of shed-tunnel and the tunnel entrance were respectively taken into account.The results show that internal force of shed-tunnel was reduced along with the distance of shed-tunnel and tunnel entrance increasing;and the higher Physical mechanics property index of the rock is,the smaller structure internal force of shed-tunnel is;in some cases,rigid joint is better than hinge joint to be applied in the joint part of shed-tunnel and hidden hole.更多还原