Study on Impact Analysis and Control Technology of Shield Tunnels Undercrossing Existing Operating Railways
The shield tunneling construction has great influence on existing operating railways.This paper has studied the dynamic changes of railway deformation during tunneling,and analyzed vertical and horizontal unevenness of railway tracks by relying on a case study of a railway-related project in Xuzhou and employing Midas GTS NX software to establish a three-dimensional finite element calculation model.The results show that:in the process of shield tunneling,the settlement value of the railway roadbed gradually increases,and eventually becomes stabilized.The distribution curve of railway roadbed settlement caused by tunnel construction can be approximated as a normal distribution,with the roadbed settlement value directly above the tunneling position being the maximum.The maximum values of vertical and horizontal unevenness of the railway tracks meet the regulatory requirements.In addition,it also demonstrates the feasibility of the design scheme for tunneling underneath the Beijing-Shanghai railway.To further ensure the safety of tunneling construction,a series of protective measures for railway-related construction are proposed to provide reference for similar projects.
shield tunneltunneling constructionrailway roadbedrailway bridgefinite element analysis
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