新建隧道近接下穿地铁区间的沉降影响分析

Analysis of Settlement Influence of New Tunnel Adjacent to Undercrossing Subway Section

以某电力隧道近接下穿北京地铁1号线区间为背景,采用数值模拟和现场监测相结合的方法,对隧道穿越地铁区间引起的沉降进行分析。结果表明:地铁沉降经历“缓慢沉降→快速沉降→稳定沉降”三个阶段,其中快速沉降发生在隧道下穿阶段,该阶段地铁沉降最大;隧道后穿越段地铁沉降略大于先穿越段;地铁边墙及中墙处沉降略小于中线处沉降;地铁沉降和变形缝差异沉降最大值分别为2.0、0.5 mm,均小于地铁变形控制值,满足地铁运营管理要求。

Based on a electric power tunnel adjacent to crossing Beijing Subway section of Line 1,the settlement caused by new tunnel crossing subway section is analyzed via numerical simulation and on-site monitoring.The results show that the subway settlement has experienced three stages of"slow settlement-rapid settlement-stable settlement".Among them,the rapid settlement occurs in the tunnel undercrossing stage,which is the largest settlement.The settlement of the subway in the later crossing section is slightly greater than that in the first crossing section.The settlement at the side wall and middle wall is slightly less than that at the center line.The settlement and differential settlement of deformation joint are 2.0,0.5 mm respectively,which are less than the subway deformation control value,meeting the requirements of subway operation management.