汶川地震区跨断层带公路隧道震害形成机理分析

Highway tunnel damage caused by earthquake and its mechanism crossing fault zone in Wenchuan Earthquake Area

为提高震区断层破碎带段隧道结构的抗震性能,结合震区公路隧道断层破碎带段震害调查资料,对隧道断层破碎带段震害机理及抗减震对策进行研究。研究结果表明:隧道非活动性断层段震害类型与普通段无异,仅需采取抗震措施进行加固即可,震害主要由地震惯性力造成,强制位移影响很小。隧道活动性断层段震害严重,须进行抗震设防,造成严重震害的主要影响因素为断层错动,地震惯性力次之。隧道活动性断层段须采取抗震措施与减震措施相结合的对策共同应对。

For improving aseismatic performance of highway tunnel fault rupture zone in the seismic area,combining earthquake damage information of highway tunnel fault rupture zone in the seismic area,the study focus on earthquake damage mechanism and aseismatic and shock absorption countermeasures. The results show that earthquake damage type is the same of tunnel non-active fault zone and normal section. Tunnel nonactive fault zone need to develop seismic fortification measures for seismic fortification. The seismic inertia force is main factor of tunnel non-active fault zone earthquake damage,and forced displacement has little effect. The earthquake damage of tunnel active fault zone is very serious. Tunnel active fault zone need to do seismic fortification. The main factor of earthquake damage of tunnel active fault zone is fault rupture,closely followed by seismic inertia force. Aseismatic and shock absorption countermeasures are common used to do seismic fortification of tunnel active fault zone.