超大断面隧道变截面段的施工研究

Study on Construction of Variable Section of Super-large Section Tunnel

超大断面隧道的设计与施工技术较为复杂,需要进行变截面的设计,其施工的要求较高。超大断面的构成主要由合修过渡到分修依次扩大断面构成的。超大断面隧道与普通隧道存在一定的差距,其主要体现在开挖作业、断面高、变截面等方面的难度较大。本文以我国的某项超大断面隧道工程中变截面段的施工进行分析,总结了变截面施工的难点与技术的要点,旨在提高超大断面隧道的施工质量。

The design and construction technology of super-large section tunnel is more complicated, so it is necessary to design variable section. The construction requirements are high. The composition of super-large section is mainly composed of combined repair to separate repair. There is a certain gap between super-large section tunnel and ordinary tunnel, which is mainly reflected in excavation operation, section high. This paper analyzes the construction of variable section section in a large section tunnel project in China and summarizes the difficulties and technical points of variable section construction. The purpose of this paper is to improve the construction quality of super-large section tunnel.