地面交通荷载对浅埋隧道的动力响应分析

为研究地面交通荷载对浅埋隧道的动力响应,建立地面移动荷载作用下隧道数学模型.以济南市顺河快速路南延地下结构工程为背景,将地面交通荷载进行合理近似简化;利用动力方程推导围岩波势函数表达式,结合边界条件确定的波函数展开项系数,得到移动荷载作用下隧道的动力响应,并利用数值模拟的方式对结果进行验证;讨论移动荷载速度及隧道埋深对动力响应的影响.结果表明:径向应力响应在隧道拱顶处引起较大响应;切向应力则在拱顶处和两侧均引起较大响应;车辆速度及隧道埋深是影响动力响应大小的因素.

Dynamic Response of Surface Traffic Load to Shallow Buried Tunnel

To study the dynamic response of surface traffic load to shallow buried tunnel, the mathematical model of tunnel under ground moving load is established. Taking the underground structure project of south extension of Shunhe Expressway in Jinan City as the background, the surface traffic load is approximately simplified. The expression of the potential function of the surrounding rock wave is derived according to the dynamic equation. Combining the boundary conditions, the expansion term coefficient of the wave function is determined. The dynamic stress response of the tunnel under moving load is obtained and verified by numerical simulation. The effects of moving load velocity and tunnel depth on dynamic response are discussed. The results show that the radial stress response causes significant response at the tunnel vault, the tangential stress causes significant stress response at the arch top and both sides. Vehicle speed and tunnel buried depth are the factors affecting the dynamic response.