Experimental study on shear performance of laminated shear energy dissipation structure for tunnel seismic resistance
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% .
tunnellaminated shear energy dissipation controlshear performancecorrelation analysisseismic mitigation effect
万方数据
维普
