【摘要】 基于工程波动理论,应用ABAQUS数值模拟和理论解析方法,研究了溶洞中心与隧道中心处于同一水平时,埋深对岩溶隧道地震动力响应影响规律,并对比分析地震作用下有无溶洞时隧道的反应差异性.分析结果表明:岩溶隧道和非岩溶隧道发生较大位移的部位均为拱肩和拱脚;溶洞对隧道地震动有缓冲作用;岩溶隧道埋深越浅,地震动力响应位移越大;在地震作用下,隧道二次衬砌第一主应力较集中的部位是拱脚.埋深15 m时第一主应力最大,埋深100 m时第一主应力最小;埋深100 m时,岩溶隧道比非岩溶隧道的第一主应力小,说明溶洞对隧道岩体有一定的应力释放作用.更多还原

【Abstract】 Based on the engineering wave theory, ABAQUS numerical simulation and theoretical analysis method are applied to study the influence rule of buried depth on the seismic dynamic response of karst tunnel when the karst cave center and tunnel center are at the same level, and the response difference of tunnels with and without karst cave under earthquake. The analytical results show that the large displacements of karst tunnel and non-karst tunnel occur at the arch shoulder and arch foot. The karst cave can buffer the ground motion of the tunnel. The shallower the buried depth of karst tunnel is, the larger the seismic dynamic response displacement is. Under the action of earthquake, the first principal stress of the secondary lining of the tunnel locates at the arch foot. The first principal stress is the highest when the buried depth is 15 m and the lowest when the buried depth is 100 m. When the buried depth is 100 m, the first principal stress of karst tunnel is smaller than that of non-karst tunnel, which indicates that karst tunnel has a certain stress release effect on tunnel rock mass.更多还原