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- Title
地铁出入口原位扩建施工力学行为及关键技术研究.
- Authors
杜玉峰
- Abstract
Based on the renovation project of the Xitucheng Station on the Changping Line of Beijing Rail Transit, taking the existing A entrance and exit renovation case as the research background, a scheme comparison was conducted by combining the surrounding environment and geological conditions. Key technologies such as reinforcement measures, breakthrough renovation nodes, and construction steps were optimized and studied. Establish a three-dimensional finite element numerical model for the entire process of in-situ expansion construction using the subway entrance and exit pile method, and explore the laws of surface settlement induced by in-situ expansion construction using the subway entrance and exit pile method and the deformation of existing entrance and exit structures based on on-site monitoring results. The results show that: (1)using the hole pile method for construction, the pile beam arch bearing system formed by it can protect the safety of the main structure construction operation, bear the geological load, effectively reduce geological settlement and environmental impact, and ensure the safety of the existing entrance and exit structures; (2) The numerical simulation results are basically consistent with the on-site measured data, and the maximum surface settlement of the on-site monitoring and numerical simulation results are 62. 8 mm and 65. 07 mm, respectively. The initial support arch and the second lining arch have the greatest contribution to surface subsidence in the two stages; (3)The main impact stage of the existing structure is the large excavation stage, with a maximum settlement of 1. 4 mm. The research results can provide new ideas and methods for the operation of entrance and exit renovation and expansion projects.
- Publication
Railway Investigation & Surveying, 2024, Vol 50, Issue 3, p162
- ISSN
1672-7479
- Publication type
Article
- DOI
10.19630/j.cnki.tdkc.202404190003