汶川地震公路隧道洞口段震害机理及抗震对策研究

Study of the Earthquake Damage Mechanism and Aseismatic Countermeasure of a Highway Tunnel Portal Section in the Wenchuan Seismic Disaster Area

汶川地震中震区公路隧道洞口段破坏严重,严重影响了震区生命线工程的畅通。为提高震区公路隧道洞口段的抗震能力,结合公路隧道洞口段震害情况对其震害机理进行了研究。研究结果表明,洞门、边仰坡及明洞震害主要是地震惯性力作用造成的;软岩隧道洞口段衬砌震害主要是地震惯性力和强制位移造成的。文章根据隧道洞口段的震害机理,提出了相应的抗震对策。研究结果对于进一步研究高烈度地震区公路隧道震害机理及抗震对策都有着重要的意义。

Earthquakes destroyed a tunnel portal section in the earthquake region of Wenchuan, and this seriously affected the lifeline engineering of this seismic area. This study focuses on the mechanism of earthquake damage in order to improve the seismic capacity of highway tunnel portal sections and summarizes earthquake damage information regarding highway tunnel portal sections. Results show that earthquake damage to tunnel portal structures, slopes around the tunnel entrance and opencut tunnels are mainly attributable to seismic inertial force, and the damage of the soft rock tunnel lining structure was caused by seismic inertial force and forced displacement. According to the mechanism of earthquake damage to highway tunnel portal sections, corresponding countermeasures are presented. These results are important to the further study of earthquake damage mechanisms and earthquake countermeasures for highway tunnels in highly seismic areas.