中文摘要：

为研究地震荷载作用下隧道结构的动力响应,以指导隧道修建施工和衬砌支护,提高地铁隧道的整体抗震能力,采用理论分析、数值模拟和室内试验相结合的方法,对地铁隧道地震动力响应进行研究。选取沈阳地铁2号线某段隧道为工程背景,在理论分析地铁隧道地震动力响应的前提下,运用FLAC~（3D）数值软件模拟地铁隧道地震动力响应情况,地铁隧道两帮壁正负45°区域剪应力、主应力和位移最显著,监测点加速度变化趋势与输入地震波加速度时程曲线较为一致。在室内振动台试验中,地基土体表面峰值加速度明显比地基土体深部大,隧道两帮壁正负45°位置附近应变最大,振动停止后应变并未归零。数值模拟与室内试验研究结果较为吻合表明,由于人工波的地震烈度较现场波大,地铁隧道的地震扰动强烈;地铁隧道两帮壁正负45°区域地震动力响应剧烈,极易发生破坏。可根据这一现象有针对性地采取抗震措施,保证地铁隧道的安全、稳定。

英文摘要：

The paper is to introduce the results of our simulated testing study on the seismic dynamic response of the subway tunnel under the strong seismic load. We have joined the method of theoretical analysis with the numerical simulation and laboratory testing so as to provide a guide for tunnel construction and the linear plot up-setting,thus having greatly enhanced the seismic capacity of the entire structure of the subway tunnel. For example,we have successfully chosen a certain tunnel of Metro Line 2 in Shenyang as the engineering sample. To achieve the purpose,we have first of all made a theoretical analysis on the seismic dynamic response of the tunnel,and,then,we have made the seismic dynamic response of the tunnel via the numerically simulated approach with FLAC~（3D）. What we have done for the research goal is to settle down the variation of the shear stress,the maximal principal stress and the displacement of the two sidewalls of the tunnel in an area of ± 45°. And,in the same way,we have settled down the acceleration changing trend and the time history curve of acceleration of the monitoring point are identical with each other.Through the vibration table testing,we have found the peak value of the acceleration on the soil surface was greater than that in the bottom part. What is more,the maximum value of the strain tends to appear in the area of ± 45° of the two sidewalls of the tunnel,whereas that of minimum tends not to be zero when the vibration turns to have ceased-up. Thus,the results of our numerical simulation prove to be consistent with that of the laboratory testing.Moreover,it has also made clear that the seismic dynamic stress of the subway tunnel can be found more intense for the intensity of the artificial seismic waves seems greater than that of the actual seismic waves. Since the seismic motion in the area within ± 45°of the two sidewalls of the tunnel turns to particularly serious,it is easy for the said sidewalls to get split. Therefore,according to what we have found,it is absolut