地铁区间浅埋暗挖隧道地表沉降的控制标准

基于浅埋暗挖隧道施工引起地表沉降的时空效应和沉降机理分析,综合运用模糊聚类分析方法对北京地铁5号线和10号线24个区间隧道的1497个地表沉降测点的数据进行统计分析,得出了地铁区间浅埋暗挖隧道地表沉降值的分布规律和地表沉降槽宽度参数反弯点距离、地层损失率的一般特征,给出了地表沉降槽曲线反弯点距离与等效轴向埋深的关系,提出了较为合理可行的地标沉降控制标准,并提出预警、报警、极限3级控制的管理方法.研究成果为认识地铁区间浅埋暗挖隧道地表沉降及地表沉降控制标准制定等具有一定的参考价值.

Control Standard of Ground Surface Settlements in Metro Section Shallow Tunnel

Based the analysis of temporal-spatial effect and settlement mechanism,apply the fuzzy cluster analysis for 1 497 ground surface settlements of 24 running tunnels in Beijing subway Line 5,represent the general distinction of shallow tunnel ground surface settlements regularities of distribution and the surface settlements trough width parameter inflexion point distance,and the loss ratio of stratum,gain the relation between surface settlement trough width parameter inflexion point distance and equivalence axial depth of burial,put forward a feasible surface settlement control criterion,and control method contains the 3 classes：prewarning、alarm and extreme.Research findings supply some reference value for cognitive shallow tunnel ground surface settlements regularities of distribution and develop control standard.