双洞隧道洞口段抗减震振动台试验  

Shaking Table Tests on Entrance Anti-seism of Double Track Tunnels

作　　者：王峥峥[1] 高波[1] 索然绪[2] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]西安公路研究所,陕西西安710054

出　　处：《中国公路学报》2009年第2期71-76,共6页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(50878187);四川省交通厅交通建设科技项目(2006A24-58)

摘　　要：以西南高烈度地震区某拟建隧道为背景,开展了隧道洞口段抗减震振动台模型试验研究。通过对有无减震层体系的对比试验,研究了减震层的减震效果;并针对目前振动台试验普遍采用的多次加载方案产生的损伤累积问题进行了分析,同时给出了围岩和衬砌的裂纹发展过程及破坏形态。结果表明:在围岩与隧道之间设置减震层可以有效减弱围岩与结构之间的动力相互作用,从而起到减震效果;在评价结构抗震性能时需要考虑多次加载产生的损伤累积和裂纹效应的影响。研究结果可为结构在地震作用下的开裂分析提供参考。Based on the background of tunnels constructed on high-intensity earthquake zone in southwest China, the large-scale shaking table tests were accomplished for studying the seismic capability of the entrance of double track tunnels. The seismic mitigation effect was discussed through the comparison tests of models with and without seismic absorption layer. The effect of damage accumulation caused by multi-loading scheme was analyzed. The propagation process and damage patterns of cracks on surrounding rock and tunnel lining were described. Results show that a seismic absorption layer covered between surrounding rock and tunnel can reduce the dynamic interaction between the surrounding rock and lining structure effectively, meanwhile, the effect of damage accumulation and cracks due to multi loading scheme should be considered under the evaluation on the seismic capability of tunnels. The results provide a reference for cracking analysis of tunnels under seismic action.

关 键 词：隧道工程 双洞隧道洞口段 振动台试验 损伤累积 裂纹效应 

分 类 号：U451.5[建筑科学—桥梁与隧道工程]