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中南大学学报(自然科学版)

Journal of Central South University

第51卷    第9期    总第313期    2020年9月

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文章编号:1672-7207(2020)09-2558-13
跨活动断裂带城市浅埋地铁隧道结构两阶段设计方法研究
安韶1,陶连金1,边金2,张宇1,韩学川1

(1. 北京工业大学 工程抗震与结构诊治北京市重点实验室,北京,100124;
2. 广东海洋大学 海洋工程学院,广东 湛江,524008
)

摘 要: 考虑到活动断裂带场地错动危险发生的不确定性,以乌鲁木齐轨道交通2号线工程为例,提出适用于断层错动作用下城市浅埋地铁隧道结构的两阶段设计方法。首先给出错动作用下城市浅埋地铁隧道的两阶段设计内容,其次建立三维弹塑性有限元模型,并按照包络设计原则确定最不利错动面,最后对区间隧道结构进行不同设计阶段的损伤破坏分析。研究结果表明:在错动作用下,两阶段设计水准要求与抗震设防水准保持一致。乌鲁木齐地铁2号线区间隧道上盘与破碎带交界面为最不利错动面;采用柔性接头减灾措施以后,在区间隧道进行100 a内超越概率为10%的错动量分析时,结构处于弹性状态或部分处于弹塑性状态,满足第一阶段设防水准要求。在进行100 a内超越概率为3%~2%的错动量分析时,结构的破坏控制在局部区域内,防止了整体倒塌,满足第二阶段设防水准要求。

 

关键字: 断层错动;地铁隧道;两阶段设计方法;最不利错动面

Study on two-level design method of urban shallow subway tunnel structure crossing active fault
AN Shao1, TAO Lianjin1, BIAN Jin2, ZHANG Yu1, HAN Xuechuan1

1. Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit, Beijing University of Technology, Beijing 100124, China;
2. College of Ocean Engineering, Guangdong Ocean University, Zhanjiang 524008, China

Abstract:In consideration of uncertainties of fault dislocation, taking the Urumqi rail transit line 2 project as an example, a two-level design method for urban shallow subway tunnel under effect of fault dislocation was proposed. Firstly, the two-level design content was given, and then the three-dimensional elastic-plastic finite element models of soil-tunnel structure were established to determine the most disadvantageous fault rupture plane based on envelope design principle. Finally, the damage analysis of the tunnel structure in different design levels was carried out. The results show that the two-level design content during fault dislocation is consistent with that of seismic design, and the interface between hanging wall and fracture zone of Urumqi subway tunnel is determined as the most disadvantageous fault rupture plane. With the disaster mitigation method of flexible joint, the tunnel structure is in elastic state or partially in elastic-plastic state under the effect of fault displacement of exceeding probability 10% in one hundred years, satisfying the fortification requirements of the first level. Under the action of fault displacement of exceeding probability 3%-2% in one hundred years, the tunnel structure is in elastic-plastic state and the damage of structure is controlled in the local area preventing the overall collapse, satisfying the fortification requirements of the second level.

 

Key words: fault dislocation; subway tunnel; two-level design method; the most disadvantageous fault rupture plane

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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