Deformation monitoring and multi-parameter risk assessment of subway hub construction using joint mt-insar and field measurements

doi:10.13474/j.cnki.11-2246.2025.0213

Abstract

Abstract: Rapid metro expansion is accompanied by frequent construction accidents, making deformation monitoring and interpretation crucial for ensuring construction safety. This paper optimized MT-InSAR for improving the coherence of construction areas according to the subway construction characteristics. Moreover, the InSAR and on-site measurements are combined to supplement the spatiotemporal and angular gaps of subsidence. The deformation process of the construction area of Shapu Station on Shenzhen Metro Line 12 is interpreted, and the deformation results are finally used for multi-parameter settlement risk assessment. The results show that: ① The number of points and coherence in the Shapu construction area are significantly improved; ② Combined analysis of groundwater level and leveling measurements reveals that excavation of foundation pits and tunnel lead to uneven settlement of surrounding structures by 10～30 mm, with three settlement funnels identified; ③ Combined analysis with machine vision monitoring indicates that the main structural deformation after backfilling is due to the load of backfill soil, with an average compression of approximately 4.31 mm in the backfill layer; ④ The deformation risk is higher along the sides of the tunnel and foundation pit, as well as in the 37～42 ring segments of the station.

Key words: deformation monitoring, MT-InSAR, subway construction, risk assessment

CLC Number:

P237
P258

QIN Xiaoqiong, ZHANG Yaxuan, XU Bintao, LIU Yuzhou, LIU Zhencheng, HONG Chengyu, CHEN Xiangsheng, WANG Chisheng. Deformation monitoring and multi-parameter risk assessment of subway hub construction using joint mt-insar and field measurements[J]. Bulletin of Surveying and Mapping, 2025, 0(2): 71-76.

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