广州轨道交通L8北延伸段某盾构隧道区间地表沉降实测分析

依托广州轨道交通L8北延伸段石亭和亭白区间隧道施工过程中地表沉降实测数据,通过曲线拟合等方法探究隧道施工过程地表沉降规律。利用PECK公式对典型监测断面地表沉降数据进行分析,对最大地表沉降量、沉降槽宽度等特征参数进行统计。通过对比研究不同地层条件下地表沉降规律,对地表沉降量与穿越地层及上覆地层条件的关联性进行分析。研究结果表明,隧道穿越地层条件对地表沉降影响程度显著,而上覆地层条件对地表沉降影响有限。因此,隧道施工过程中需尤其关注穿越地层条件,采取合适的掘进控制措施、监测预警方案以保证地面建筑物和道路安全。

Analysis of Ground Settlement in Some Shield Tunnel Section of North Extension of Guangzhou Rail Transit L8

Based on the measured data of ground settlement during the construction of the tunnel section between Shiting&Tingbai in the north extension of Guangzhou rail transit L8,the law of ground settlement during the tunnel construction is explored by curve fitting.The PEAK formula is used to analyze the surface settlement data of typical monitoring section,and the characteristic parameters such as the maximum surface settlement and the width of settlement trough are calculated.Based on the comparative study of the surface settlement law under different strata conditions,the correlation between the surface settlement&the conditions of the crossing strata and the overlying strata is analyzed.The results show that the ground settlement is affected by the condition of tunnel crossing stratum,while the effect of overlying stratum is limited.Therefore,in the process of tunnel construction,it is necessary to pay special attention to the crossing stratum conditions,take appropriate tunneling control measures,monitoring&early warning programs to ensure the safety of ground buildings&roads.