多层大断面暗挖结构临时支撑拆除沉降及应力分析

STUDY ON THE SETTLEMENT AND MECHANICAL BEHAVIOR OF TEMPORARY SUPPORT REMOVAL OF MULTI-LAYER AND LARGE SECTION EXCAVATION STRUCTURE

文中借助数值模拟方法,以三种多层大断面暗挖结构临时支撑拆除的施工方案为研究对象,分析支撑拆除过程中暗挖初期支撑结构内力变化以及引起的沉降量,探讨最适合于在工程中采用、经济上较为合理且二次衬砌与临时支撑拆除能够相互协调的合理施工步序,为其他类似工程的方案设计提供参考。

Three kinds of construction schemes of temporary support demolition of multi-layer and large section concealed excavation structure were studied in this paper using numerical simulation method. The internal force variation and settlement caused by the initial support structure of concealed excavation in the process of support demolition were analyzed. The reasonable construction steps which are most suitable for practical use, economics and coordination between the secondary lining and temporary support demolition were discussed. The result can provide reference for the scheme design of similar projects.