%0 Journal Article
%T 基坑近接既有地铁盾构隧道施工影响分区方法<br>Impact of Partition Method in Pit Construction Adjacent to Existing Metro Shield Tunnel
%A 郑余朝
%A 施博文
%A 孙克国
%A 杨天春
%A 李辉&lt
%A br&gt
%A ZHENG Yuchao
%A SHI Bowen
%A SUN Keguo
%A YANG Tianchun
%A LI Hui
%J 西南交通大学学报
%D 2017
%R 10.3969/j.issn.0258-2724.2017.05.010
%X 为了确保基坑近接既有地铁盾构隧道的结构安全和正常运营，在对盾构隧道纵向等效刚度模型研究的基础上，建立了隧道纵向变形曲率与螺栓承载状态和线路正常运行要求的公式.结合沈阳某深、大基坑近接既有地铁盾构隧道施工工程的实际情况，通过改变既有盾构隧道相对新建基坑的空间位置关系，进行了多工况三维数值模拟计算分析，得到了基于桩锚支护的基坑近接既有地铁盾构隧道施工的强、弱、无影响分区图，并通过现场的沉降实测结果等验证影响分区标准和控制技术的有效性.研究结果表明：盾构隧道纵向变形曲率半径是基坑近接盾构隧道施工中隧道结构安全和正常使用的关键指标，可将盾构隧道纵向变形曲率半径作为近接影响判断准则；在确定基坑近接既有盾构隧道施工工程的影响分区时，可将盾构隧道轨道线形受影响的临界状态及管片接头极限状态下隧道纵向变形曲率半径，分别作为强弱影响区和弱无影响区的划分阈值.<br>：In order to ensure the structural safety and normal operation of pit construction occurring adjacent to an existing metro shield tunnel, research on a longitudinal equivalent rigidity model of a shield tunnel was performed to establish the relationship between the tunnel's longitudinal deformation curvature and the bolt's bearing condition, and to set the requirements for a normal operation of the track. Subsequently, the actual engineering conditions of a particular deep-large pit in Shenyang, which is adjacent to an existing subway shield tunnel, were used to create a three-dimensional numerical analog. By changing the spatial position of the newly constructed pit near the existing shield tunnel with pile-anchor support, zoning charts were drawn and divided into zones of strong, weak, or no influence. Settlement measured in the field confirmed the efficiency of zoning standards based on influence and control technology. The results show that the longitudinal deformation curvature of the shield tunnel is the key index for determining the safety and normal operation of pit construction adjacent to the existing metro shield tunnel. Consequently, the tunnel's longitudinal deformation curvature can be used as a zoning standard for the influence of the adjacent subway shield tunnel. Finally, the critical state of the track alignment and the longitudinal deformation curvature of the tunnel joint within the limit state can be used to define the thresholds for zoning charts divided into zones of strong, weak, and no influence
%K 基坑
%K 盾构隧道
%K 曲率半径
%K 近接施工
%K 影响分区
%K &lt
%K br&gt
%K pit
%K shield tunnel
%K radius of curvature
%K adjacent construction
%K influence partition
%U http://manu19.magtech.com.cn/Jweb_xnjd/CN/abstract/abstract12483.shtml