【摘 要】
：
通过大型振动台模型试验研究了减震层效能评定方法的准确性和减震层作用下衬砌结构与最不利的IV级和V级围岩在激振过程中的相互作用.研究结果表明:减震层效能评定方法可以较为准确地评估减震层在地震动力作用下对衬砌结构的作用效果,但随着激振加速度峰值的提高,试验值会与评估值产生偏差,因此对减震层效能评定方法引入地震动力损伤系数以提高其精确度;围岩级别相较于减震层的厚度对衬砌结构的地震响应更具有决定性作用;在中低烈度地震区,减震层对衬砌结构的保护效果较为明显,但减震层存在最优厚度,超过该厚度,衬砌结构遭遇地震时的震动
【机 构】
：
西南交通大学交通隧道工程教育部重点实验室,成都610031;西南交通大学陆地交通地质灾害防治技术国家工程实验室,成都610031;成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都610059
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通过大型振动台模型试验研究了减震层效能评定方法的准确性和减震层作用下衬砌结构与最不利的IV级和V级围岩在激振过程中的相互作用.研究结果表明:减震层效能评定方法可以较为准确地评估减震层在地震动力作用下对衬砌结构的作用效果,但随着激振加速度峰值的提高,试验值会与评估值产生偏差,因此对减震层效能评定方法引入地震动力损伤系数以提高其精确度;围岩级别相较于减震层的厚度对衬砌结构的地震响应更具有决定性作用;在中低烈度地震区,减震层对衬砌结构的保护效果较为明显,但减震层存在最优厚度,超过该厚度,衬砌结构遭遇地震时的震动更加强烈,在高烈度地震区,减震层的效果差异在不同围岩中逐渐不再明显;减震层的存在改变了衬砌结构的自振特性,让衬砌与围岩之间在地震动力作用下有一定的刚性位移裕度,减少了相对位移的幅值.
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