火灾高温下盾构衬砌结构试验与力学模型综述

发布时间：2018-03-26 05:27

本文选题：盾构隧道　切入点：火灾高温　出处：《中国公路学报》2017年08期

【摘要】：复杂运营环境下自然与人为因素所引发的众多隧道火灾已造成了重大的社会影响和经济损失。火灾已成为威胁隧道安全运营的主要灾害之一,其对隧道衬砌结构会产生严重的损伤乃至破坏。盾构衬砌为装配式结构,接缝多以螺栓连接,火灾高温下易发生管片爆裂和接缝连接薄弱部位受损而诱发的突然破坏;同时,由于盾构隧道周围地层的约束作用有限,其衬砌结构体系受火损坏后垮塌的风险极高。为提高软土地层环境下盾构隧道装配式衬砌结构体系的耐火能力及火灾安全性,本文调研了盾构隧道火灾安全研究现状,对与盾构隧道火灾安全研究相关的试验及理论分析工作做了较为全面的综述,主要包括:火灾高温下盾构隧道衬砌管片力学特性试验与理论分析模型,火灾高温下管片接缝力学特性试验与理论分析模型,火灾高温下盾构衬砌体系力学特性试验与理论分析模型,火灾高温下盾构隧道周围地层力学行为研究。在此基础上,针对大直径盾构隧道的火灾试验,高温引起的盾构衬砌管片材料性能劣化评价及主动式抗火管片的材料设计,火灾高温条件下盾构衬砌结构计算模型精细化这3个核心问题,展望了盾构衬砌受火灾影响的研究方向和思路。
[Abstract]:Many tunnel fire complex operation environment caused by natural and man-made factors have caused great social impact and economic losses. The fire has become one of the main disasters threaten the safety management of tunnels, cause serious damage and even destruction of the tunnel lining structure of shield lining. Assembled many joints connected by screw bolts. Fire prone segment burst and joints of weak parts damaged caused sudden destruction; at the same time, owing to the restriction effect of shield tunnel surrounding strata are limited, the lining structure system under fire damage after the collapse of the high risk. For fire resistance of fire safety and improve the soft soil environment of shield tunnel prefabricated lining system in this paper, research status of tunnel fire safety, security and Research on shield tunnel fire test and theoretical analysis is made for the relevant work A comprehensive review, including: experimental and theoretical analysis of shield tunnel lining mechanical characteristics model under fire, experimental and theoretical analysis of mechanical characteristics of segment joints under fire model test and theoretical analysis, the mechanical properties of shield lining system model under fire, on the mechanical behavior of surrounding strata under fire shield tunnel. Based on this, according to the fire test of large diameter shield tunnel design, material properties of shield segment material degradation evaluation caused by high temperature and active fire resistance segment, under the condition of high temperature fire shield lining structure calculation of the 3 core issues of model refinement, the direction of research and ideas of the prospect of shield tunnel affected by the fire.

【作者单位】：同济大学土木工程防灾国家重点实验室;同济大学地下建筑与工程系;上海市政工程设计研究总院(集团)有限公司;
【基金】：国家自然科学基金项目(51478345,51578410)
【分类号】：U456

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