盾构近间距穿越对既有隧道的影响参数研究

Research on the Parameters Influence on the Existing Tunnel During Nearby Shield-driven Construction

软土地区盾构近距离穿越既有隧道的工程近年来不断增加。针对新老隧道间距和穿越角度这两个影响参数对既有隧道的变形进行研究分析,采用三维有限差分软件进行数值模拟。两种方法的结果进行对比验证后,归纳这两个参数对既有隧道垂直位移变化的规律。

Recently, more and more tunnels need to cross above or beneath the existing metro line in soft soil. To evaluate the influence of such construction on the existing tunnel, two parameters were studied in this article based on monitoring data. They were the vertical interval between the two tunnels and the projection angel. The numerical simulation by three-dimensional finite difference software was also used to compared the results from the two design parameters. The displacement rules of the existing tunnel were concluded.