双连拱公路隧道围岩压力计算方法

Calculation method of pressure of surrounding rock on double-arch road tunnel

连拱隧道按荷载结构模式计算分析时,围岩压力的计算仍采用现行《公路隧道设计规范》中的方法,这种计算方法存在一定的问题。探讨了连拱隧道的深浅埋界限,对常用的围岩压力理论进行了比较,找出连拱隧道采用现有围岩压力理论进行计算存在的问题,提出了建议的连拱隧道围岩压力计算方法,并对建议的计算方法进行了效果分析。结果表明,建议的计算方法对连拱隧道及大跨度隧道的设计计算是合理和偏于安全的。

When the reliability of multi-arch tunnel is calculated according to load structure method, it is a significant task to further study because of the question for calculation of pressure of surrounding rock on multi-arch tunnel according to current Code for Design of Road Tunnel. First, the boundary between deep and shallow depth of multi-arch tunnel is discussed. Second, it is compared with ordinary theories of pressure of surrounding rock. The problems between them are found out. Last, the improved calculation of pressure of surrounding rock on multi-arch tun- nel is presented. The effects induced by the improved calculation are analyzed. The results show that it acts as reference for design and calculation for multi-arch and large span tunnel in future. 3 tabs, 4 figs, 14 refs.