西安地铁盾构施工引起地表沉降规律分析

结合黄土地区的特殊性对西安地铁施工引起的地表沉降影响因素进行了初步探讨,根据有关勘测资料,采用三维数值模拟软件FLAC3D对盾构推进过程进行了模拟,以西安地铁二号线工程为背景,对开挖引起的地表沉降规律进行了研究.分析了隧道纵向沉降分布规律、黄土特性对盾构法施工中地表沉降的影响、地表沉降与黄土层覆土厚度的关系以及黄土特性对盾构法施工中土体变形的影响,从而得出了黄土地区地表沉降的一般规律.

Analysis on the Law of Ground Surface Settlement Induced by Shield Construction in Xi'an Subway

A preliminary exploration is carried out about the influential factors of ground settlements caused by the subway construction in Xi＇an.The mechanics of surface settlement induced by shield construction is generalized systematically.The disturbance of soil caused by shield tunnel construction results in the soil movement,mainly the ground settlement,which is one of the problems highly concerned in the design and construction of shield tunneling.Shield tunneling is simulated by a finite difference code FLAC3D according to the survey information.Then,the characteristics of ground settlement are studied on the basis of the measured data of Xi＇an No.2 Subway Line and the result of numerical analysis.The characteristics of ground settlement on lateral section of the tunnel and the lateral extension of settlement as well as ground settlement on longitudinal section of the tunnel are studied.The complexion of loess area and the general law of ground surface settlement are fully considered.