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As the scale of urban public transport facilities such as railways, elevated bridges, and river-crossing tunnels expand, monitoring networks for major infrastructure will play an increasingly prominent role in ensuring urban security. This study examines a typical case of a metro tunnel that was affected by an adjacent foundation pit dewatering project. The influence of engineering activities on soft soil adjacent to it and a nearby metro tunnel monitored by an extensometer group was analyzed, and the effectiveness of this monitoring was evaluated. Results showed that the former effectively monitored the deformation of soft soil layers and confined aquifer caused by the foundation pit dewatering. Moreover, although there was some relative settlement of the metro tunnel caused by the adjacent foundation pit dewatering, the absolute tunnel deformation was still controlled by the overall deformation state of the tunnel section affected by the changes in the deep geological environment. [ABSTRACT FROM AUTHOR]

Land subsidence is one of the most prominent geological disasters in the plains of Shanghai and all over the world, directly threatening the urban ecological environment and major infrastructure security. The monitoring of land subsidence is an important part of the prevention and control of the land subsidence hazard. After 50 years of practice and exploration of land subsidence monitoring techniques, a land subsidence monitoring network has been constructed in Shanghai. This paper explores the development trend of land subsidence monitoring technology, through the analysis of the present application of international land subsidence monitoring technology, and summarizes the status of land subsidence monitoring network construction and the application of new technology in Shanghai. The results are valuable for the development of land subsidence monitoring and the application of new technology at home and abroad. [ABSTRACT FROM AUTHOR]

The First International Symposium on Urban Geology was held between April 10 and 12, 2017, in Shanghai, China. More than 100 experts and scholars from around the world gathered here to share the latest research achievements in the field of urban geology, according to the symposium theme of Land Subsidence and Urban Security. This article summarizes the research topics and trends regarding the prevention and control of land subsidence at home and abroad that were covered at the symposium, including the proceedings of the symposium, theme reports, and the full text of papers presented at the symposium. This article provides reference for the investigation and research of urban land subsidence. [ABSTRACT FROM AUTHOR]