Metro Protection Zone Monitoring Scenario

Metro Protection Zone Monitoring Scenario

1. Scenario Overview

1.1 Engineering Background

Urban rail transit structure safety protection zones are areas where external operations may affect the safety of rail transit structures. According to CJJ/T 202-2013 and local rail transit protection regulations, monitoring must be implemented for external operations within the protection zone to ensure operation safety.

1.2 Protection Zone Classification

Protection Level	Range	Applicable Structures
Special Protection Zone	5m outside structure outer line	Underground stations, tunnels
Level I Protection Zone	15m outside structure outer line	Elevated, ground structures
Level II Protection Zone	30m outside structure outer line	General areas

1.3 Core Challenges

Challenge Category	Description	Response Strategy
High Frequency	Monitoring frequency up to 4 hours/time during operation	Automated monitoring system
Real-time Response	Need to respond within minutes when abnormal	Real-time data, automatic early warning
Multi-party Coordination	Involvement of owner, construction party, monitoring party, operation party	Unified platform, collaborative process
Complex Environment	Dense buildings, heavy traffic, complex pipelines	Optimized layout, protective measures
Data Standardization	Multi-source data from different units	Unified standards, standardized access

2. Monitoring Objectives and Indicators

2.1 Overall Objectives

The overall objective of protection zone monitoring is to: through systematic monitoring, real-time grasp of the impact of external operations on rail transit structures, timely detection of abnormal changes and early warning, provide data support for safety protection, and ensure operation safety.

2.2 Monitoring Indicator System

2.2.1 Elevated Bridge Monitoring

Monitoring Item	Monitoring Content	Precision	Method	Frequency
Pier horizontal displacement	Horizontal displacement of pier	±0.5mm	Automated total station	4h
Pier vertical displacement	Settlement of pier	±0.5mm	Automated total station	4h
Pier inclination	Inclination of pier	±1/10000	Automated total station	4h
Track beam settlement	Settlement of track beam	±0.5mm	Automated total station	4h

2.2.2 Tunnel Monitoring

Monitoring Item	Monitoring Content	Precision	Method	Frequency
Tunnel convergence	Change in tunnel diameter	±0.5mm	Automated total station	4h
Tunnel settlement	Settlement of tunnel	±0.5mm	Automated total station	4h
Track bed settlement	Settlement of track bed	±0.5mm	Automated total station	4h
Segment joint opening	Opening of segment joints	±0.1mm	Joint gauge	1d

3. Monitoring Scheme Design

3.1 Monitoring Point Layout

3.1.1 Elevated Bridge Monitoring Points

Monitoring Object	Layout Principle	Quantity
Pier	Each pier 4-6 points	Per pier
Track beam	Each span 3-5 points	Per span
Bearing	Each bearing 2 points	Per bearing

3.1.2 Tunnel Monitoring Points

Monitoring Object	Layout Principle	Spacing	Quantity
Tunnel convergence	Along tunnel, each section	5m	Per section
Track bed settlement	Along track bed	10m	Per point
Segment joint	Key joints	5m	Per joint

3.2 Monitoring Frequency

Operation Stage	Frequency	Basis
Normal period	4h/time	Standard requirement
Warning period	2h/time or 1h/time	Warning response
Emergency period	Real-time	Emergency response
Stable period	1d/time	Stable period

4. Rapid Reporting System

4.1 Rapid Report Format (4-hour)

[XX Project Monitoring Rapid Report]
Report Period: YYYY-MM-DD HH:00-HH:00

I. Monitoring Overview
- Monitoring Project: XX
- Monitoring Frequency: 4h/time
- Points Monitored: XX

II. Data Summary
- Maximum Change: XXmm (Point XX)
- Maximum Rate: XXmm/d
- Warning Status: None/Yes

III. Trend Analysis
- Change Trend: Stable/Increasing/Decreasing
- Relationship with Construction: Related/Unrelated

IV. Suggestions
- Continue monitoring/Encrypt monitoring/Start emergency

4.2 Reporting Process

Data Collection → Automatic Analysis → Report Generation → Manual Review → Release

5. Early Warning and Emergency Response

5.1 Warning Levels

Warning Level	Trigger Condition	Response Time	Measures
Blue	Control value 50%	24h	Strengthen monitoring
Yellow	Control value 70%	12h	Encrypt monitoring, coordination meeting
Orange	Control value 85%	6h	Start emergency plan
Red	Control value 100%	Immediate	Stop work, emergency rescue

5.2 Emergency Response Process

Warning Trigger → Automatic Notification → Manual Confirmation → Response Measures → Effect Evaluation → Record Archive

6. Related Documents

• Protection Zone Monitoring Design
• Shield Passing Pier
• Rapid Daily Report Specification
• Protection Zone Early Warning and Emergency Response
• Raocheng Highway Utility Tunnel Case

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