引汉济渭大型深埋无压隧洞断面优化设计

摘要

对于隧洞工程设计，断面型式的选择不但涉及结构安全、施工方便，更是涉及经济合理性。合理的隧洞断面型式是决定隧洞工程设计成败的关键。以引汉济渭秦岭隧洞黄三段工程为例，针对隧洞的不同断面型式，从工程地质、结构受力、施工条件等因素进行分析比选，提出优化的马蹄形断面型式。%It is necessary to consider the structure security,construction facilities,saving investment and reasonable technology about the choice of the tunnel forms. The choice of reasonable tunnel cross section is the most important for the tunnel engineering design. Based on the Huangjinxia-Sanhekou tunnel of Hanjiang-to-Weihe River water diversion project,we analyzed and compared the different tunnel cross sections ,according to the topography,geology,mechanical property,construction conditions and other factors. Finally,we proposed an optimized type of horseshoe cross-section.