文章摘要
黄博,曾宇,杜怡韩,于千,邹煜,周莉莉.PBA工法暗挖车站导洞施工应力场分布研究[J].安徽建筑大学学报,2022,30():
PBA工法暗挖车站导洞施工应力场分布研究
Study on Stress Field Distribution of Subsurface Excavated Station during Heading Construction by Pile-Beam-Arch Method
投稿时间:2021-04-14  修订日期:2021-06-12
DOI:
中文关键词: 地铁  应力场分布  数值计算  PBA工法  导洞施工  开挖顺序
英文关键词: subway  stress field distribution  numerical calculation  pile-beam-arch method  heading construction  excavation sequence
基金项目:安徽省高等学校自然科学研究项目(KJ2018A0108 , KJ2018A0118);国家级大学生创新创业训练计划项目(202010363117);安徽工程大学国家基金预研项目(2019yyzr08);安徽工程大学校级科研项目(Xjky110201912)
作者单位E-mail
黄博* 安徽工程大学 建筑工程学院 huangbo@ahpu.edu.cn 
曾宇 中国矿业大学(北京) 力学与建筑工程学院,北京  
杜怡韩 安徽工程大学 建筑工程学院  
于千 安徽工程大学 建筑工程学院  
邹煜 中国矿业大学(北京) 力学与建筑工程学院,北京  
周莉莉 中国矿业大学(北京) 力学与建筑工程学院,北京  
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中文摘要:
      为了研究地铁车站采用PBA工法施工时,导洞开挖顺序对车站范围土体竖向应力分布的影响,利用数值模拟的方法,建立了横通道联合上下双层各8导洞的数值模型,设立了4种导洞施工方案进行对比,给出了特征平面应力场分布图,着重分析了不同施工方案对应力场分布规律、应力集中系数及应力极值点位置等的影响。结果表明:先开挖上层或下层导洞,会使得先开挖的这层导洞周围土体的应力集中程度高于后开挖者;对比所有方案四个层面的应力集中系数平均值,可以发现先开挖一层导洞再开挖另一层导洞这种常用的施工方案,要优于上下层导洞之间交错开挖,因此方案一和四在实际施工中是优先选用的,也便于施工组织;应力极值点基本都处于车站靠横通道进口一侧,在交叉区域形成较为明显的应力集中现象,施工中需要做好交叉口的支护作业来应对这一问题。
英文摘要:
      In order to investigate the influences of heading excavation sequence on vertical stress distribution of soil around station, numerical model including cross passages and eight pilot tunnels on two layers is built by numerical simulation. Four construction schemes are put forward for comparison, then stress field distribution of characteristic planes in each scheme are given. The influences of construction schemes on stress field distribution law, stress concentration factor and location of stress extreme point are emphatically analyzed. The results show that stress concentration degree around the first excavated layer of pilot tunnel is higher than the second one. Compare average value of stress concentration factor in different schemes, it can be found that the common scheme excavate upper and lower layers by turns is better than interlaced excavation between different layers. So scheme 1 and scheme 4 can be preferred to use in practical construction, which also convenient to construction organization. The stress extreme points are all located close to the side with import of cross passage, and stress centralizations are more obvious appeared in cross regions, so it must be supported carefully in cross regions to deal with this problem.
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