The subway, as an important means of transportation in cities, its safety is of paramount importance. In recent years, frequent subway accidents have led to casualties and property damage, highlighting the insufficiency of safe construction monitoring technologies and methods. Therefore, establishing an effective online subway monitoring system is of great significance for early warning of sudden accidents, maintaining construction safety, and social stability.
This system is based on the Internet of Things, cloud computing, and big data technology, combined with the innovative application of "Internet Plus" in subway monitoring, to establish an automated monitoring platform. Through this platform, it is possible to achieve automated monitoring of the entire subway line, improve monitoring efficiency and accuracy, and form a regional demonstration effect.
The main monitoring content includes:
Subway foundation pit monitoring, which refers to the settlement, horizontal displacement, internal force of the retaining piles (walls), deep horizontal displacement of the soil outside the pit, anchor rod axial force, groundwater level, support axial force, and uplift of the pit bottom, etc.
Subway tunnel monitoring, which is divided into shield method and mining method, includes monitoring of segment clearance convergence, structural stress, arch settlement and convergence, blasting vibration, and vertical displacement of the central column structure, etc.
Surrounding risk source monitoring, which monitors surface settlement, pipeline settlement, building inclination, uneven settlement, cracks, bridge pier inclination, and uneven settlement, etc.
Monitoring equipment includes:
Support axial force, strain gauges, axial force meters
Building (structure) vertical displacement, static level meters
Bridge pier vertical displacement, fully automatic robots
Building (structure) cracks, crack meters
Bridge pier inclination, box-type fixed inclinometers
Segment structure vertical displacement, laser rangefinders
Anchor rod axial force, rebar meters
Groundwater level, pore water pressure meters
Subsurface pipeline vertical displacement, fully automatic robots
During the construction period, the subway online monitoring system compares the monitoring data with the design values to determine whether the construction process and parameters meet expectations, to predict potential dangers in advance and take engineering measures to ensure construction quality and safety.
During the operation period, it achieves continuous and precise monitoring of horizontal and vertical displacements in the interval, grasps the characteristics and patterns of interval deformation during subway operation, and realizes information-based monitoring. When the change values exceed the preset values, the system can issue timely warnings.
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