隧道的平面线形一般设计为直线，但近年来，采用曲线隧道的工程越来越多。隧道震害的大量出现引起了人们对隧道抗震研究的重视，目前隧道的抗震研究大多是基于直线隧道开展的，而针对作为隧道抗震薄弱环节的隧道曲线部分的研究尚不多见。 本文从直线隧道的震害特性出发，结合曲线隧道的几何特性，探讨了曲线隧道的震害机理，并通过数值分析方法研究了曲线隧道的地震响应特性及抗减震措施。具体研究内容及取得的成果如下： （1）探讨了曲线隧道的震害机理，认为直线隧道的震害特性在曲线隧道中仍有类似体现，此外，曲线隧道的震害特性还与曲线隧道的曲线半径、转弯角度以及曲线段加宽等因素有关。 （2）利用数值模拟软件建立了曲线隧道三维数值仿真模型，对曲线隧道在地震波入射方向、曲线半径、转弯角度及围岩级别等因素影响下的地震响应特性进行了数值模拟研究。并通过与相同条件下直线隧道的计算结果进行对比分析，找到了曲线隧道抗震分析中的重点分析部位及一般地震响应规律，即在地震作用下，曲线隧道与直线隧道的结合部位出现明显的应力集中，且曲线隧道沿轴线方向各部位的位移、应力及内力响应均有较大变化，证明曲线隧道的地震响应规律比直线隧道复杂。 （3）分析了直线隧道抗减震措施（加固围岩、改变衬砌刚度）对曲线隧道的适用性。结果显示，加固曲线隧道区段围岩对曲线隧道的抗减震作用不大，而通过适当的调整衬砌混凝土弹性模量、增加衬砌厚度则有利于曲线隧道抗减震。

The horizontal alignment of tunnel is generally designed as a straight line, but in recent years, the curved tunnel is increasingly being adopted. Since seismic damages frequently occur to tunnels, people began to pay high attention to seismic analysis. But at present, the seismic research of tunnel is based on the straight line tunnel mostly, and the seismic research for the curved tunnel which is being vulnerable to seismic damage is no more common. The paper started out the features and mechanism of seismic damage for general tunnels. Combined with the geometric properties of curved tunnel, explored the mechanism of seismic damage of curved tunnel, and study the seismic response properties and anti-seismic and seismic-relieving measures of curved tunnel through numerical analysis method. Specific research and the results achieved are as follows: (1)To explore the seismic damage mechanism of curved tunnel, and that the seismic disaster characteristics of the straight tunnel still apply to the curved tunnel. In addition, seismic disaster characteristics of curved tunnel are relative to the curve radius of curved tunnel、the turning angle of curved tunnel and the curved portion of tunnel widening and other factors. (2)Through numerical simulation software to establish the 3D numerical simulation model of curved tunnel, the study on seismic response properties of curved tunnel under factors of the direction of seismic waves, curve radius, steering angle and rock classification have been proceed. And compared with the results of the straight line tunnel under the same condition, derived the key locations of seismic analysis and the law of general seismic response of curved tunnel. Under the seismic action, the joint of the curved tunnel and straight tunnel appeared stress concentration obviously. Along the curved tunnel axis direction, each section’s displacement, stress and internal force response has a large change; it proved that the law of seismic response of curved tunnel is more complex than the law of seismic response of straight tunnel. (3)The question of the measures of the anti-seismic and seismic-relieving for general tunnel whether or not apply to curved tunnel has been analyzed. The results show that the measure on the reinforcement of the part of surrounding rock of curved tunnel will not achieve good damping effect, and through changing the lining concrete modulus of elasticity and increasing the lining thickness of curved tunnel properly can avail the anti-seismic and seismic-relieving of curved tunnel.