长沙地铁二号线盾构隧道下穿京珠高速公路施工地表沉降控制研究

On the construction surface subsidence control of the shield tunnel of Changsha metro line 2 under-wearing Beijing-Zhuhai expressway

长沙地铁二号线盾构隧道下穿京珠高速公路可能引起地层位移和路基沉降,影响高速公路的正常运营,施工风险大。根据实际条件,文章建立三维数值模型,采取数值模拟与现场实测相结合的方法来研究盾构隧道施工引起的地表沉降特征,提出了控制措施。实测显示隧道施工对于京珠高速公路的正常运营影响很小。

The shield tunnel of Changsha metro line 2 under-wearing Beijing-Zhuhai expressway may leads to stratum displacement and subgrade settlement,which affects the normal operation of the expressway,so the construction risk is large.According to the actual condition,this paper establishes three-dimensional numerical model,uses the method that combines numerical simulation and field measurement to study the surface subsidence characteristics caused by shield tunnel construction,and proposes control measurements.The measurement shows that the influence of the tunnel construction on the normal operation of Beijing-Zhuhai expressway is little.