高铁列车动载作用下盾构隧道管片疲劳影响因素及评价方法研究

发布时间：2018-01-04 03:27

本文关键词：高铁列车动载作用下盾构隧道管片疲劳影响因素及评价方法研究　出处：《西南交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着我国高速铁路和城市轨道交通建设的飞速发展,不同交通形式的空间交叉问题将会越来越多,彼此之间相互影响的静动力学问题将会越来越突显出来。在上部通过的高速列车所产生的动荷载长时间的作用下,下穿隧道的盾构管片结构是否会产生疲劳损伤破坏,将会影响到隧道管片结构的自身安全,同时也会危及到上部高速列车的行车安全。为此,以广州地铁九号线广州北～花城路区间下穿武广客专(京广高铁)车站为工程背景,应用数值模拟方法,对高速铁路动荷载作用下的盾构隧道管片的疲劳影响因素和评价标准开展研究。其主要研究工作和成果主要集中在以下几个方面：1)在总结国内外有关混凝土结构疲劳方面的研究成果的基础上,对盾构隧道管片的受力进行数值模拟计算分析,得到管片关键部位最大应力水平和最小应力水平,依据混凝土标准试件经验公式计算得到管片的疲劳寿命极限N,并初步提出了盾构隧道管片疲劳寿命极限以混凝土受拉疲劳寿命作为评价依据；2)研究了不同隧道埋深、地层条件及动载组合对管片疲劳极限的影响,得到管片的疲劳寿命极限随隧道埋深的增加和围岩条件的变好而增加,且当动载同时作用于中间两条相邻轨道板时管片的疲劳寿命最小；3)利用提出的评价方法结合实际工程计算管片的疲劳寿命极限,土体未加固时,隧道管片的疲劳寿命不能满足使用要求；当采用设计加固方案对土体进行加固后,管片的疲劳寿命能满足使用要求,计算得到其安全储备期为16年,设计加固方案可行。
[Abstract]:With the rapid development of China's high-speed railway and city rail transit construction, cross space of different types of transportation will be more and more, the mutual influence between static dynamics problems will become more and more serious. The dynamic load of the long time effect of high-speed trains in the upper part of the case, whether the shield segment structure of tunnel will cause fatigue damage will affect the tunnel structure of their own safety, but also endangers the safety of the high-speed train. To this end, the Guangzhou metro line nine North to Guangzhou Huacheng road interval through Wuhan Guangzhou Railway Passenger Dedicated Line (Beijing Guangzhou high-speed rail) station as the engineering background, using numerical simulation method of high speed the fatigue effect of shield tunnel segment of railway loading factors and evaluation criteria for the study. The main research work and achievements mainly focused on the following aspects: 1 ) according to the research achievements at home and abroad on the fatigue of concrete structures, the shield tunnel segment force analysis of numerical simulation, get the maximum stress level and minimum stress level of the key parts of the segment, according to concrete standard specimens of empirical formula calculation of fatigue life limit of N segment, and put forward the shield tunnel segment limit fatigue life to concrete tensile fatigue life as a basis for evaluation; 2) of different tunnel depth, the formation conditions and effects of dynamic combination of segment fatigue limit, increase the fatigue life of limit segment with buried depth of tunnel and surrounding conditions better and increase, and when the fatigue life the dynamic load effect at the same time in the middle of the two adjacent track plate segment is minimum; 3) by using the proposed method combined with the fatigue life of the segment limit calculation of practical engineering, without soil. The fatigue life of tunnel segments can not meet the requirements of operation. When the design reinforcement program is applied to reinforce the soil, the fatigue life of segments can meet the requirements of operation. The safety reserve period is calculated to be 16 years, and the design and reinforcement plan is feasible.

【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U451

【参考文献】