【摘要】 采用FLAC3D对9度地震区一实际重大工程的公路隧道明洞结构进行了抗震计算,得到了衬砌结构各控制点的加速度及内力响应规律,同时比较了不同填土厚度条件下衬砌结构的安全性能。结果表明:在50 a超越概率为10%的人工合成地震波条件下,衬砌的控制设计位置为衬砌墙脚、仰拱;随着填土厚度的增加,支护结构安全系数普遍降低;拱肩部为临界稳定位置等。更多还原

【Abstract】 Aseismatic calculation was used for the analysis on open tunnels of freeway for an important practical engineering project.The response of acceleration and internal forces of structure were described,and then the safety of structures embedded at different depths of soil was discussed.It was shown that key points controlling the structure design were the locations of the basement of sidewall and the middle part of inverted arch.The safety factor of supporting structure would decrease with the increase of thickness of filled soil,and the shoulder of arch would become the critical position of stability.更多还原