提高地下管廊管网及其支撑结构抵抗地震灾害的能力，是城市生命线安全运行与建设韧性城市的关键环节。针对地下管廊管网内部管线重量大、空间受限、构件密集等特点，研发了一种设计参数可调的小型减隔震橡胶支座，安装在支架与管线之间以提升整体抗震性能。通过有限元数值计算，对该减隔震系统进行了参数分析和效果验证；基于试制的两种减隔震橡胶支座（有铅芯和无铅芯），开展了管廊电缆支架减隔震的足尺振动台试验。结果表明，该隔震措施能够显著降低地震作用传递与力学响应。采用白噪声激励模拟环境振动，两种隔震支座使得电缆水平方向的振动响应降低40%-60%；在8度小震和中震作用下，隔震支座的减隔震效果随地震动强度增强而提升，支架根部应力降低40%~50%；当加载至8度大震时，因支座已存在损伤，隔震性能有所下降，减震效果在30%左右。小震阶段无铅芯橡胶支座表现较好，而在大震作用下铅芯橡胶支座效果更好。本文研发的减隔震橡胶支座具有体积小和安装更换方便等特点，能显著提高管廊支架和管网的抗震性能。

Enhancing the seismic resistance of underground utility tunnels and their support systems is essential for ensuring the safe operation of urban lifeline infrastructure and promoting resilient cities. Considering the characteristics of heavy pipe loads, limited installation space, and densely arranged components inside utility tunnels, a compact rubber isolator with adjustable design parameters is developed for installation between pipe supports and pipelines to improve seismic performance. Finite element analyses are conducted to evaluate its parameter influence and isolation effectiveness. Full-scale shaking table tests on cable supports equipped with two types of rubber isolators (with or without lead core) are further performed. The results indicate that the proposed isolation measure can significantly reduce seismic demand and structural response. Under environmental vibration simulated by white noise, the horizontal acceleration response of the cable is reduced by 40%–60%. Under minor earthquakes of seismic intensity VIII, the stress at the support base decreases by 40%–50%, and the isolation effectiveness becomes more pronounced with increasing seismic intensity. Under major earthquakes of seismic intensity VIII, due to damage accumulation in the isolators, the reduction effect declines to approximately 30%. The isolator without lead core performs better under small earthquakes, whereas the lead-core rubber isolator provides superior mitigation under major earthquakes. With small size and easy installation/replacement, the proposed rubber isolators can effectively enhance the seismic resilience of utility tunnel support systems.