新建盾构区间上跨既有地铁区间施工安全分析

Construction Safety Analysis of New Shield Tunneling Section crossing the Existing Metro Section

沈阳市地铁十号线工程中医药大学站~松花江街站区间采用盾构法施工,在K9+800上跨已经运营的地铁二号线崇山路~岐山路区间。盾构区间左线与既有二号线区间人防段净距约0.612m,盾构区间右线与既有二号线区间标准段净距约1.116m。文章通过建立有限元模型,采用数值分析方法,综合考虑边界条件、地层参数、开挖方案等影响因素,模拟盾构隧道掘进力学行为,开展相关分析,验证了施工方案的可行性。研究流程及方法可为类似工程提供借鉴参考。

The section between the station of the University of Traditional Chinese Medicine and the station of Songhuajiang street of the project of Shenyang metro line 10 is constructed by using the shield tunneling method,crossing the already operational section of Chongshan road to Qishan road of the metro line 2 over K9+800.The net distance between the left line of the shield tunnel section and the civil air defense section of the existing line 2 section is about 0.612m,and the net distance between the right line of the shield tunnel section and the standard section of the existing line 2 section is about 1.116m.The finite element model is established,the numerical analysis methods are adopted,and influencing factors such as boundary conditions,geological parameters,and excavation schemes and so on are comprehensively considered to simulate the mechanical behavior of shield tunnel excavation.The relevant analysis is carried out to verify the feasibility of the construction scheme.The research process and methods can provide reference for similar projects.