After the installation of rubber isolation layer in tunnels, surrounding rock convergence may apply permanent pressure on the tunnel, compressing the isolation material. This can reduce its elasticity, impairing its recovery capacity and potentially leading to failure. Therefore, this paper proposes a new type of pressure-resistant isolation layer that embeds the compressive layer into the energy dissipation layer. Indoor testing of the material was carried out to obtain the test data, and parameters were fitted based on a phenomenological hyperelastic constitutive model, and the fitting effect was evaluated and verified. On the basis, a numerical model was established to investigate the static load-bearing capacity, seismic isolation, and energy dissipation performance of the compressive layer’s polyurethane material within the pressure-resistant isolation layer under varying aperture sizes and hardness. The results show that: compared with the rubber isolation layer, the pressure-resistant isolation layer reduces compression rates by 13.3% to 18.3% under static load. Under seismic action, the acceleration reduction rate is reduced by approximately 10%, while the stress reduction rate of the lining increases by around 20%, and the energy dissipation effect improves by 15%. This demonstrates that the pressure-resistant isolation layer effectively improves static load-bearing capacity, energy dissipation, and reduces lining stress. Additionally, its isolation performance is significantly influenced by parameters such as the aperture size and hardness of the compressive layer.

中文翻译：

---

用于隧道和性能分析的新型耐压隔振层

在隧道中安装橡胶隔离层后，围岩会聚可能会对隧道施加永久压力，压缩隔离材料。这会降低其弹性，损害其恢复能力，并可能导致故障。因此，本文提出了一种新型的抗压隔离层，将压缩层嵌入耗能层中。对材料进行室内测试，得到测试数据，基于现象学超弹性本构模型拟合参数，对拟合效果进行评估和验证。在此基础上，建立了数值模型，研究了不同孔径尺寸和硬度下抗压隔振层内压缩层聚氨酯材料的静承载能力、隔震和耗能性能。结果表明：与橡胶隔振层相比，耐压隔振层在静载荷下降低了13.3%至18.3%的压缩率。在地震作用下，加速度降低率降低约 10%，而衬砌的应力降低率提高约 20%，耗能效果提高 15%。这表明，耐压隔振层有效提高了静载能力、能量耗散，降低了衬里应力。此外，其隔离性能还受到孔径大小和压缩层硬度等参数的显著影响。