处于上软下硬地层的青岛某地铁车站初支拱盖法施工变形规律及控制
龚旭东
Deformation Pattern and Control of Qingdao Metro Station Adopting Primary Arch Cover Construction Method in Upper Soft and Lower Hard Stratum
GONG Xudong
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作者信息:陕西省铁道及地下交通工程重点实验室，710043，西安
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Affiliation:Shaanxi Railway and Underground Traffic Engineering Key Laboratory, 710043, Xi′an, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2021.06.024
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中图分类号/CLCN:TU433O231.4
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栏目/Col:施工技术
摘要:
以处于上软下硬地层的青岛地铁某车站修建为背景，采用数值模拟及现场监测相结合的方法，对初支拱盖法施工变形规律及控制进行了研究。结果表明：拱盖中间导洞的开挖、拱盖施作和临时支撑的拆除,是车站修建中的几个关键工序；拱盖施工阶段，拱脚与拱肩部位受力转换频繁，沉降变形较明显，临时支撑拆除造成拱部围岩二次应力释放，需采用一定支护手段控制沉降；沉降槽最大值随开挖推进不断发生移动，直到中间导洞开挖时沉降最大值逐渐向隧道中心线上移动；适当缩小施工进尺距离与增加支护系统的刚度,对控制车站结构变形速率与变形量具有积极作用。
Abstracts:
Taking the construction of a station of Qingdao Metro as an example, by adopting combination of numerical simulation and field monitoring, the deformation pattern and control of primary arch cover construction method is studied. The results show that: Excavation of the middle guide of the arch cover, construction of the arch cover and removal of temporary support are some of the key procedures during station construction. In the operation stage of arch cover, the stress forced on arch foot and arch shoulder is switching between each other frequently, and the settlement deformation is obvious. Removal of temporary support results in secondary stress release of arch surrounding rock, which requires certain supporting measures to control the settlement. Maximum value of settlement trough moves as excavation progress advances. Until the middle guide tunnel is excavated, the maximum settlement gradually moves to the center line of the tunnel. Appropriately reducing the length of footage and increasing the stiffness of the support system have positive influence on controlling the deformation rate and magnitude of the station structure.
引文 / Ref:
龚旭东.处于上软下硬地层的青岛某地铁车站初支拱盖法施工变形规律及控制[J].城市轨道交通研究，2021，24（6）：109.
GONG Xudong.Deformation Pattern and Control of Qingdao Metro Station Adopting Primary Arch Cover Construction Method in Upper Soft and Lower Hard Stratum[J].Urban mass transit，2021，24（6）：109.
GONG Xudong.Deformation Pattern and Control of Qingdao Metro Station Adopting Primary Arch Cover Construction Method in Upper Soft and Lower Hard Stratum[J].Urban mass transit，2021，24（6）：109.
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