不良地质条件下盾构法施工隧道地表沉降规律研究

结合我国某市地铁某标段工程实例,采用数值模拟的方法对该标段不良地质条件下盾构法施工隧道地表沉降规律进行研究。研究结果表明:盾构法施工隧道因其不易受到外界环境的影响,在隧道开挖过程中围岩变形较小,变形区域基本呈槽型;数值模拟结果和实测数据结果基本吻合,最大沉降为4.5mm左右,且发生在隧道正上方。

Surface Settlement Regularity of Construction of Shield Tunnel under Bad Geological Condition

Taking one subway section project in China as an example,this paper uses the numerical simulation method to study the surface settlement rule of the construction of shield tunnel under bad geological condition.The results show that the construction of shield tunnel has smaller surrounding rock deformation because it is less susceptible to external environmental impact,and the deformation region is substantially grooved.The numerical simulation results and measured data are consistent with the results.The maximum settlement is about 4.5mm,and occurs on the top of the tunnel.