Abstract
With the continuous advancement of national urbanization and the ongoing improvement of infrastructure construction, urban underground space is gradually being exploited, and large-scale infrastructure projects are increasingly intersecting and interacting, giving rise to the issue of protecting previously constructed facilities from subsequent development. To ensure the safe and successful implementation of projects, comprehensive safety assessment is essential. Three-dimensional finite element modeling and analysis, as an advanced technological means, can provide decision-makers with relatively sufficient data support and has gradually become a necessary condition for the protection of critical infrastructure nodes. This paper, based on the actual engineering case of safety assessment of the impact of the new construction project on Plot 831 of Yuanchuanghui on adjacent subway structures, establishes a "project foundation pit-stratum-subway structure" coupled model using the MIDAS GTS/NX finite element numerical simulation analysis software, analyzes the influence of various working conditions during the foundation pit construction process on the structure of Subway Line 3, introduces the key points of three-dimensional numerical modeling for safety assessment work, proposes corresponding control measures to reduce the potential impact of foundation pit engineering on adjacent subway structures, and provides reference experience for similar safety assessment work in the future.
Full Text
Key Considerations in Safety Assessment of Foundation Pit Engineering Impacts on Adjacent Subway Structures
Zhang Qian, Hu Jiwei
Guangzhou Metro Engineering Consulting Co., Ltd., Guangzhou 510000, China
Abstract
As urbanization accelerates and infrastructure development intensifies, the exploitation of urban underground space has expanded considerably. This trend has led to increasingly complex interactions between large-scale infrastructure projects, creating significant challenges in protecting existing structures from subsequent construction activities. To ensure the safe and successful implementation of projects, comprehensive safety justification is essential.
Three-dimensional finite element modeling has emerged as an advanced technological tool that provides robust data support for decision-makers, gradually becoming a prerequisite for protecting critical infrastructure nodes. This paper presents a case study on the safety assessment of a new construction project at Yuanchuanghui Plot 831 and its impacts on adjacent subway structures. Using MIDAS GTS/NX finite element numerical simulation software, a coupled "foundation pit-soil strata-subway structure" model was developed to analyze the effects of various construction stages on Metro Line 3 structures. The paper elaborates on key considerations for three-dimensional numerical modeling in safety assessment and proposes corresponding control measures to mitigate potential impacts from foundation pit engineering on adjacent subway structures, offering valuable reference experience for similar future assessments.
Keywords: Foundation pit engineering; Subway structure; Numerical simulation analysis; MIDAS GTS/NX; Subway structure deformation control