岩石地层地铁车站双侧壁导坑法施工技术研究

Subway station side heading method construction technology research in the rock formation

以在建的重庆市轨道交通10号线鲤鱼池车站为背景,利用Midas-GTS(NX)建立地铁车站三维有限元计算模型,分析双侧壁导坑法施工对车站隧道围岩稳定性的影响。分析结果表明,核心土的开挖对车站隧道围岩的位移和应力都产生了显著的影响:隧道拱顶最大竖向位移为9.3 mm;围岩最大主应力0.52 MPa,最小主应力3.10 MPa;支护结构最大主应力10.88 MPa,最小主应力19.51 MPa,其最大主应力超过混凝土的抗拉强度值,在施工过程中应该给予足够的重视。

In this paper,the constructing Liyuchi station of Chongqing rail transit line 10 was cited as an example. The software Midas-GTS（ NX） was used to establish a three-dimensional finite element calculation model for the deep buried metro station,to analyze the influence of double sidewall drift method construction on the stability of tunnel surrounding rock. The results show that the displacement and stress of the cross-section tunnel are influenced by the construction of the core soil. The horizontal displacement of tunnel vault is 9. 3 mm. Maximum principal stress of surrounding rock is 0. 52 MPa,and the minimum principal stress is 3. 10 MPa. The maximum principal stress of the support structure is 10. 88 MPa,and the minimum principal stress is 19. 51 MPa. The minimum principal stress exceeds the tensile strength value of concrete and should be paid more attention during the construction process.