【摘要】 提出一种新型叠层剪切吸能(LSED)结构改变衬砌连接方式，能够保证隧道在轴向上具有良好的变形能力和在环向上具有较好的抵抗变形的刚性能力。基于LSED结构的竖向承载和剪切变形能力开展LSED结构的室内剪切试验和数值试验研究，利用变异系数法评价橡胶剪切模量、橡胶层单层厚度、橡胶层层数和结构有效直径等因素对LSED结构水平剪切性能影响的权重。最后，利用有限元软件ABAQUS建立LSED结构-隧道衬砌-围岩三维精细化工程模型，并采用动力时程分析方法对其地震响应进行分析。研究结果表明：在压剪状态下，结构整体位移由下到上逐渐增大，橡胶层的受拉区主要集中在外侧边缘，拉应力及其分布面积由两端向中间逐渐减小，上表面的最大名义主应变最大值由上到下逐渐减小；钢板层较大应力区域主要分布在靠近上下封板部位。设计因素中橡胶剪切模量和结构内部钢板直径对LSED结构的水平等效刚度的影响更为显著；LSED结构的设置能有效降低衬砌的地震响应，且减震率达到45%以上。更多还原

【Abstract】 A new laminated shear energy dissipation(LSED) structure was proposed to ensure that the tunnel lining has good deformation capacity in its axial direction and enough rigidity in its circumferential direction. Based on the bearing capacity and shear deformation capacity of the LSED structure, the indoor shear test and numerical test of LSED structure were carried out through numerical model tests under different working conditions, and the variation coefficient method was used to evaluate the weight proportion of the shear modulus of rubber, the thickness of rubber layer, the number of rubber layers and the effective diameter on the horizontal shear performance of LSED structure. Finally, based on the above basic research on LSED structure, the finite element software ABAQUS was used to establish a three-dimensional refined engineering model of LSED structure-tunnel lining-surrounding rock, and the seismic response analysis was carried out by using the dynamic time history method. The results show that the overall displacement increases gradually from bottom to top under the compression shear state. For the rubber layers, the tensile zone mainly concentrates on the outer edge of the structure. The value and distribution range of the tensile stress decrease from both the upper and lower ends to the inside of the structure. The maximum value of the maximum nominal principal strain on the upper surface of the rubber layers decreases from the top to the bottom of the structure. For the steel plate layer, larger stress distributes on the plate layers around the upper and lower sealing plates. The shear modulus of rubber and the diameter of steel plate inside the structure have more significant effects on the horizontal equivalent stiffness of LSED structure. Meanwhile, the installation of LSED structure can effectively reduce the seismic response of the lining,and the seismic mitigation rate reaches more than 45%.更多还原