三车道公路隧道支护参数优化分析

以广东省在建3车道大断面公路隧道为依托，根据实际围岩条件、埋深、设计洞形及断面大小，对设计支护参数进行安全性能优化分析。通过对“原设计”和“优化后”的2种支护结构的平面有限元计算，得到HI～V级围岩条件下的6种典型初期支护结构型式。优化后的设计支护参数能确保安全，同时节约工程造价。

Optimized Analysis of Support Parameters of 3-lane Highway Tunnels

On the basis of 3-lane large-section highway tunnels under construction in Guangdong Province and in accordance with actual wall-rock conditions, burial depth and section size, this paper carries out the optimized analysis for safety performance of support parameters. By 2D finite element calculation of two support structure in ＂original design＂ and ＂optimized design＂, the paper obtains 6 typical initial support structure types under classes m - v wall-rock conditions. The optimized design parameters of support can ensure safety and meanwhile save project cost.