Abstract
During subway construction, mitigating the impact of construction on the surrounding environment and protecting adjacent buildings and utilities has always been a critical focus of construction control. This paper presents a case study of a station on Shanghai Metro Line 15, where the adjacent hotel building was located only 0.4 m from the foundation pit retaining structure and exhibited high settlement sensitivity. Integrated protective measures are proposed, including: temporary reinforcement with steel inclined struts prior to construction; intensified ground improvement and dewatering control during construction; optimization of the support system with rapid excavation and rapid supporting; and comprehensive intensive settlement monitoring throughout the entire process. This technical solution features strong adaptability to construction space constraints, high deformation control precision, and timely emergency response, successfully controlling settlement of the hotel lobby within 20 mm and ensuring safety of the foundation pit construction as well as normal operation of the building. The research findings provide a technical reference for similar foundation pit projects requiring protection of adjacent buildings.
Full Text
Preamble
Protective Measures for Buildings Adjacent to Metro Stations
Ju Kang
Shanghai Tunnel Engineering Co., Ltd., Shanghai 200000, China
Abstract
During metro construction, minimizing the impact on the surrounding environment and protecting adjacent buildings and utilities has always been a key focus of construction control. This paper presents a case study from a station on Shanghai Metro Line 15, where a hotel building was located only 0.4 m from the foundation pit retaining structure and exhibited high settlement sensitivity. To address these challenges, a comprehensive protection scheme was implemented, including: temporary reinforcement with steel inclined struts prior to construction; enhanced ground improvement and dewatering control during excavation; optimization of the support system with rapid excavation and immediate support installation; and intensive settlement monitoring throughout the entire process. This technical approach offers strong adaptability to constrained construction spaces, high-precision deformation control, and timely emergency response capabilities. The measures successfully limited settlement of the hotel lobby to within 20 mm, ensuring both foundation pit safety and normal building operations. The research findings provide a valuable technical reference for similar excavation projects requiring protection of adjacent structures.
Keywords: building protection; technical measures; construction process