Subway Online monitoring: A New era of urban rail safety

I. Preface

As the “oxygen provider” of modern cities, the subway not only drives the urban economic development but also leads the transformation of the way people live. However, in recent years, subway accidents have occurred frequently, and the number of casualties has been on the rise, reflecting the shortcomings in construction monitoring technology and safety management. Therefore, it is particularly urgent to establish an effective subway online monitoring system.

II. System Overview

This system is based on the Internet of Things, cloud computing, and big data technology, and combines the concept of “Internet +”. It aims to establish an automated subway monitoring platform. This platform will achieve a regional demonstration effect, inaugurate a new era of full - line automated monitoring of the subway, so as to improve the safety of construction and operation.

III. Main Monitoring contents

The main monitoring contents of the system include:

Subway 基坑 monitoring: It includes the settlement, horizontal displacement, internal force of the retaining piles (wall), deep - level horizontal displacement of the soil outside the pit, axial force of the anchor rod, underground water level, support axial force, pit bottom uplift, etc.

Subway tunnel monitoring: It is divided into the shield method and the mine method. The monitoring contents include the net - space convergence of the segments, structural stress, crown settlement and convergence, blasting vibration, vertical displacement of the middle column structure, etc.

Surrounding risk source monitoring: It includes surface settlement, pipeline settlement, building tilt, uneven settlement, cracks, pier tilt, and uneven settlement.

IV. List of monitoring items

Monitoring item Equipment name

Support axial force Strain gauge, axial force meter

Vertical displacement of buildings (structures) Static level gauge

Vertical displacement of bridge piers Automatic robot

cracks of buildings (structures) Crack gauge

tilt of bridge piers and columns Box - type fixed inclinometer

vertical displacement of segment structure Laser rangefinder

net - space convergence of segment structure Laser rangefinder

axial force of anchor rod Steel bar meter

vertical displacement of underground pipelines Automatic robot

underground water level pore pressure gauge

vertical displacement of column structure automatic robot

V. Achieved functions

Online monitoring during construction: By comparing the monitoring data with the design values, evaluate construction processes and parameters, predict potential risks, and ensure the quality and safety of the project.

Online monitoring during operation: Continuously and accurately monitor the displacement of the section, grasp the deformation characteristics, achieve information - based monitoring, and issue timely warnings when the change value exceeds the preset value.

VI. Conclusion

The subway online monitoring system is an important tool for ensuring the safety of urban rail transit. Through real - time data monitoring and analysis, it improves the safety and reliability of subway projects, reduces accidents, and protects the lives and property of people. With the continuous progress of technology and in - depth application, we look forward to this system providing more solid guarantees for the safe operation of urban rail transit.