山岭隧道洞口高陡坡面落石被动防护措施设防位置的确定及其应用研究

Determination of Location of Passive Protection Measures against Rockfall on High Steep Slope at Mountain Tunnel Portal and Its Application

根据山岭隧道高陡斜坡面危岩落石滚落的基本特征及其运动学方程,引入斜坡面上耗散落石冲击能量的消能因子,提出了在斜坡面上被动防护危岩落石措施设防位置的计算方法,同时结合成兰铁路茂县隧道出口斜坡面危岩体的分布特点,利用所提出的计算方法给出了该隧道出口斜坡面上落石防护网设置位置的建议,可为山岭隧道洞口斜坡面危岩落石防护设计提供借鉴。

According to the basic characteristics and kinematics equation of rockfall on high steep slope surface of mountain tunnel,the energy dissipation factor of dissipating rockfall impact energy on slope surface is introduced,and the calculating method is put forward for location of passive protective measures against rockfall on slope surface.Combined with distribution characteristics of the dangerous rock body on the slope at Maoxian tunnel portal of Chengdu-Lanzhou Railway,the suggestion on installing location of rockfall wire mesh on the slope of the tunnel exit is proposed by proposed calculation method,which can provide references for rockfall protection design on the slope of mountain tunnel portal.