中文摘要：

为研究非一致地震激励下沉管隧道的响应,以在建的港珠澳大桥沉管隧道为背景,基于由4台面振动台组成的线状多功能试验系统,开展了超长沉管隧道的多点振动台模型试验。鉴于超长沉管隧道工程规模和多点振动台试验系统的能力,研究了试验所需土与结构动力相似比关系,设计并制作了节段式模型箱,用于模拟沿隧道轴向的非一致地震动输入。该模型箱由4个主动箱和8个随动箱组成,总长40m。通过开展离散多点非一致激励空箱振动台试验,验证了通过节段式模型箱将离散多点输入机制转化为连续多点输入机制的可行性。基于室内动三轴试验,测试并确定了最优模型土的配制方案。综合结构惯性力和土-结构相对刚度比的相似分析,通过多种材料比选,最终选用铝合金浇铸件加工模型隧道。试验采用的隧道节段模型尺寸（长×宽×高）为600mm×375mm×170mm,总共98个,隧道模型总长达36.75m。选用与橡胶力学性质相似的硅胶条模拟隧道管节接头的GINA橡胶止水带。通过一系列工况的多点振动台试验模拟,系统获得了沉管隧道模型的非一致激励地震响应规律。通过多工况试验数据分析,分别得到了场地、隧道管节的加速度和隧道管节接头的变化情况,结构纵向加速度响应数据表明行波效应明显。试验结果表明：在常规设计地震（ODE）,最大设计地震（MDE）和罕遇设计地震（RDE）的地震强度下,管节接头的变形量均小于允许值,说明隧道结构处于安全状态。

英文摘要：

In order to investigate the response of immersed tunnel under non-uniform seismic excitation,taking the Hong Kong-Zhuhai-Macao Bridge under construction as background,themulti-point shaking table tests were conducted to simulate the super-long immersed tunnel based on linear multi-function shaking table system which contains 4shaking tables.According to the scale of the super-long immerse tunnel engineering and the characteristics of multi-point shaking table system,the relationships of similitude ratios of soil and structure powers required by the test were investigated.Besides,segmental model box was designed and manufactured for the simulation of non-uniform seismic input along the axial direction of the tunnel.The connected model boxes,with entire length of 40 m,contained 4active model boxes and 8inactive model boxes.By conducting discrete multi-point shaking table test of model boxes under non-uniform excitation,the transition from discrete multi-point input mechanism to consecutive input mode by the segmental model boxes was verified.The optimal mixture for model soils was tested and determined via the laboratory dynamic tri-axial shearing experiments.Based on the similitude analysis of both the structural inertial force and the relative stiffness ratio between soil and structure,several materials were selected and the segments of immersed tunnel were prefabricated with aluminum alloy.98 tunnel segments were used in the test,with size of 600mm（length）× 375 mm（width）× 170 mm（height）,reaching 36.75 min entire length.Silicone rubber piece whose mechanical properties are similar to those of rubber was selected to simulate the GINA rubber water stop in the tunnel tube joint.Through multi-point shaking table tests simulations under working conditions,the seismic response law of the immersed tunnel under non-uniform excitation was obtained systematically.Through the data analysis under various working conditions,acceleration of field and tunnel pipe and change conditions of tunnel element joints were