[1]马 静.建筑基坑施工全过程对下方盾构隧道变形影响研究[J].防灾科技学院学报,2018,20(04):9-15.
 MA Jing.Research on Influence of Foundation Pit Construction on Deformation of the Lower Shield Tunnel[J].JOURNAL OF INSTITUTE OF DISASTER PREVENTION,2018,20(04):9-15.
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建筑基坑施工全过程对下方盾构隧道变形影响研究()
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《防灾科技学院学报》[ISSN:1673-8047/CN:13-1377/P]

卷:
第20卷
期数:
2018年04期
页码:
9-15
栏目:
目次
出版日期:
2018-12-31

文章信息/Info

Title:
Research on Influence of Foundation Pit Construction on Deformation of the Lower Shield Tunnel
文章编号:
1673-8047(2018)04-0009-07
作者:
马 静
北京市市政专业设计院股份公司,北京 100037
Author(s):
MA Jing
Beijing Municipal Administration Professional Design Institute Co.Ltd,Beijing 100037,China
关键词:
基坑工程 盾构隧道 土体卸荷 基坑加载 变形特征
Keywords:
foundation pit engineering shield tunnel soil unloading foundation pit loading deformation characteristics
分类号:
TU473.2
文献标志码:
A
摘要:
为提升地铁盾构隧道的防灾减灾能力,以北京某典型地铁隧道及其邻域基坑工程为例,应用数值模拟的方法,对建筑物施工全过程中,下方地铁隧道的变形动态响应进行研究。结果表明:建筑基坑位于地铁隧道上方施工时,应对地铁隧道的竖向位移加密监测,在基坑施工变形影响区范围内,随着基坑与盾构隧道水平距离的增加,竖向位移逐步减小而水平位移逐步增加,应对盾构隧道围岩的深层水平位移进行加密监测; 建筑基坑施工全过程中,下方地铁盾构隧道竖向位移及水平位移的峰值均出现在基坑土方开挖卸荷完成阶段,此时,应快速封闭建筑物结构底板,避免造成更大的影响; 建筑基坑位于地铁隧道上方施工时,地铁隧道的竖向位移及水平位移均呈对称分布,在建筑基坑施工影响区范围内,随着基坑与地铁隧道水平距离的增加,盾构隧道逐步发生朝向基坑方向的扭转。
Abstract:
In order to enhance disaster prevention and mitigation of metro shield tunnel, we take a typical metro tunnel and its adjacent foundation pit project in Beijing as an example, and study the deformation dynamic response of metro shield tunnel under the foundation pit construction during the whole construction process by the method of numerical simulation. As the results show, when building foundation pit is constructed above metro tunnel, the vertical displacement of metro tunnel should be closely monitored. While within the influencing range of foundation pit construction deformation, as the horizontal distance between the foundation pit and shield tunnel increases, the vertical displacement decreases gradually while the horizontal displacement increases gradually, so the in-depth horizontal displacement of the surrounding rock of the shield tunnel should be closely monitored. In the construction of foundation pit, the peak values of vertical displacement and horizontal displacement of the shield tunnel occur at the completion stage of excavation unloading of foundation pit. At this moment, the construction foundation slab should be closed quickly to avoid exerting greater negative impacts. When the foundation pit excavation construction is carried out above the metro tunnel, both the vertical displacement and the horizontal displacement of metro tunnel are symmetrically distributed. Within the influencing range of foundation pit construction, as the horizontal distance between the foundation pit and metro tunnel increases, the shield tunnel turns gradually to the direction of the foundation pit.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2018- 08-29
基金项目:国家自然科学基金项目(51578023)
作者简介:马静(1992—),女,硕士,助理工程师,主要从事市政工程方面的设计、施工与科研工作.
更新日期/Last Update: 2018-12-20