LI C Y, WANG Z X, WANG W J,et al. Study on spatiotemporal evolution of surface deformation along Zhengzhou metro corridors and settlement mechanisms at representative stations[J].Journal of Henan Polytechnic University(Natural Science) ,2025,44(6):127-136.

doi:10.16186/j.cnki.1673-9787.2023100012

Received: 2023/10/09

Revised: 2024/01/15

Published: 2025/10/14

Study on spatiotemporal evolution of surface deformation along Zhengzhou metro corridors and settlement mechanisms at representative stations

Li Chunyi1,2, Wang Zhengxi1, Wang Wenjie3, Ding Laizhong1,3, Jing Ying3, Mai Zhiyao3, Li Bin3, Zheng Yuesong4

1.School of Surveying and Land Information Engineering， Henan Polytechnic University， Jiaozuo  454000， Henan， China；2.Key Laboratory of Mine Spatio-Temporal Information and Ecological Restoration， MNR， Jiaozuo  454000， Henan， China；3.Mineral Resources Exploration Center of Henan Geological Bureau， Zhengzhou  450006， Henan， China；4.Economic and Technology Research Institute， State Grid Henan Electric Power Co.， Ltd.， Zhengzhou  450006， Henan， China

Abstract: Objectives The surface deformation during metro operation and maintenance has become one of the most challenging issues for the current urban construction， planning and management departments， severely constraining healthy and sustainable urban development. Monitoring surface deformation along the metro corridors in Zhengzhou and characterizing its subsidence patterns and governing laws are of practical significance for mitigating potential risks during operation and maintenance，and for safeguarding public safety.  Methods The main urban area of Zhengzhou is adopted as the study area，with 88 Sentinel-1A ascending orbit images （February 2016-January 2022） utilized. An MT‑InSAR deformation inversion framework is employed to retrieve the time-series deformation fields and linear deformation-rate fields， and the spatiotemporal evolution of surface deformation within buffer zones along the metro lines is investigated. The subsidence curves for the representative Shamen station were denoised， using a Bayesian estimation algorithm grounded in probabilistic modeling. Measurement noise was removed and the subsidence -rate characteristics and sinking mechanism of the station were analyzed.  Results The results indicate that the significant subsidence zones are mainly concentrated in the eastern，northwestern，and southwestern regions of the main urban area. Among them， Huiji District in the northwest （Line 2）and Jinshui District （Lines 1 and 5） in the east exhibit the most pronounced subsidence，with maximum rates of 16 mm/a and 12 mm/a respectively The Shamen Station， located at the intersection of Lines 2 and 4， exhibits a subsidence-trough apex whose subsidence rate over the initial， active，and recession phases conforms to a logistic time-function curve. The primary cause for the surface double subsidence funnels above Shamen station within restricted mining areas is groundwater drainage during metro operation and maintenance. The twin subsidence funnels at the surface observed above the station are primarily attributed to groundwater drainage during metro operation and maintenance.  Conclusions The findings elucidate the mechanisms of surface subsidence and provide a theoretical basis and technical reference for the prevention and mitigation of surface deformation hazards in urban metro corridor zones.

Key words: groundwater environment; surface deformation; metro; MT-InSAR; mechanistic analysis