文档介绍：西安地铁区间隧道穿越地裂缝的稳定性初探
刘晓文1 王璐2 王永军3
(,天津;,西安;,洛阳)
摘要:以西安地铁二号线南门至南稍门区间隧道作为研究背景,利用有限差分软件FLAC3D对穿越地裂缝处的区间隧道的开挖过程和支护过程进行了数值模拟,首先分析了地裂缝对地铁区间隧道围岩稳定性的影响。其次,分析了全断面开挖和台阶法开挖对隧道稳定性的影响。通过对比发现台阶法开挖无论从控制沉降上还是控制塑性区上都优于全断面开挖,对实际施工具有一定的指导意义。
关键词:地裂缝;数值模拟;地表沉降;开挖方法
中图分类号:TV434 文献标识码:A
Primary Research on the Stability of the Xi’an Subway through the Ground Fissure
Liu Xiaowen1,Wang Lu2,Wang Yongjun
(1. Tianjin Urban Construction Design Institute , Tianjin , 300073 ; 2. North Institute of Information Engineering, Xi'an Technological University, Xi'an, 710025 ;3. China Railway 15th Construction Bureau , 471013)
Abstract: On the basis of the geological situation of the south gate to Nanshao gate tunnel of the Xi’an metro, the excavation and support process of the metro tunnel was simulated by the finite difference software-FLAC3D in this paper. Firstly, this paper analyzed the influence of the ground fissure on the country rock stability of the metro tunnel in the term of different lining structures. Secondly, the paper researched the influence of the full face excavation method and bench excavation method. It analyzed the ground surface settlement, crown displacement, the change of the stress of the country rock-support system, and the distribution of the plastic zone in the term of unsupported, initial support, and secondary lining. paring and analyzi