中文摘要：

以上海轨道交通9号线R413标段的三孔并行盾构隧道下穿沪-抗铁路干线为背景，采用3D动力有限元对列车动载引起下穿隧道的振动影响进行了研究。结果表明：当对向行驶的两列车机车的后转向架轮载同时作用在B隧道正上方时，为隧道结构的最不利位置；在动载作用下，拱顶竖向压力随埋深呈多段非线性变化；下穿隧道拱顶竖向压力沿纵向呈悬练线形分布，最大值出现在双线铁路的中线处，向两侧逐渐减小，影响约在铁路中线两侧各12m范围，结构产生了显著的纵向拉、压力；经对计算振动加速度和测试结果比较，两者规律基本一致。

英文摘要：

Based upon the background of three parallel shield tunnels on Shanghai rail transit Line 9 under-crossing Shanghai-Hangzhou railway, a 3D dynamic FE analysis was adopted to study the vibration effects of moving train loading on the under-crossing tunnels. Results indicated, when the back bogie＇s wheel loading of two trains moving in opposite directions falls onto the B tunnel at the same time, the tunnel structure will be in the most disadvantageous state. The dynamic pressure on tunnel crown possesses a multi-sectional nonlinear relationship with depth, and presents a catenary distribution along the longitudinal direction, the point of maximum pressure locates at the middle of the double-line railway, and the pressures gradually decrease toward both sides with the range of influence about 12m on each side to the center line of the railway. The tunnel structure sustains obviously longitudinal tension and compression. Calculated vibration accelerations were consistent with test results.