扁平特大断面隧道修筑及研究概述

扁平特大断面隧道是近几年为适应多车道高速公路而发展起来的一种隧道形式。该类隧道的扁平率低，开挖方法、受力及应力重分布的情况复杂。但是，当前我国扁平特大断面公路隧道修建数量较少，施工实践经验缺乏，无设计规范或标准。为此，文章重点总结和综述了国内扁平特大断面隧道及相似工程的建设与修筑情况；对扁平特大断面隧道的施工方法、隧道力学问题及围岩稳定性、隧道断面形式等研究热点进行总结和分析。

An Overview on Construction and Research of Super-large Cross-section Tunnels with Low Height-span Ratios

With the development of multi-lane highways,more and more super-large cross-section tunnels with low height-span ratios have been built in recent years.Due to the low height-span ratios,these tunnels are very complex in terms of excavation methods and stress distribution.However,few such tunnels have been built in China,therefore experience on the design and construction of such tunnels is quite scarce and no design standards for such tunnels are available in China.In the paper,an overview is made on the su...