Review Note
Last Update: 10/31/2024 01:04 AM
Current Deck: 6250 Questions
Published
Fields:
Front
Explain the purpose of construction monitoring in tunnelling and the key types of data collected to ensure safety and compliance. (15 marks)
Back
Purpose of Construction Monitoring
- Ensuring Worker and Structural Safety
- Monitoring detects potential ground movements, deformations, and environmental changes that could impact worker safety or lead to structural failures. Timely data on stress or deformation helps prevent accidents and safeguards tunnel integrity.
- Quality Control and Compliance
- Monitoring verifies that construction activities align with design specifications and regulatory standards. Compliance with set thresholds for deformation, vibration, and settlement is essential to meet regulatory and safety requirements.
- Mitigating Environmental Impact
- Tunnel construction, especially in urban areas, can impact nearby structures and underground utilities. Monitoring provides data to control vibrations, groundwater levels, and settlement, minimizing the impact on surrounding infrastructure and ecosystems.
- Early Detection of Geotechnical Hazards
- Ground conditions can change unpredictably, especially in jointed rock or soft soils. Monitoring identifies these changes in real-time, allowing for quick adjustments in support systems to manage risks associated with geotechnical hazards.
Key Types of Data Collected
- Deformation and Settlement
- Description: Measurement of surface and subsurface movements to detect ground settlement or tunnel convergence. This includes horizontal and vertical displacement data to ensure ground stability.
- Purpose: Helps detect potential collapse risks and ensures nearby structures are protected from excessive settlement.
- Stress and Strain Measurements
- Description: Monitors changes in stress within the tunnel lining and surrounding ground, typically measured using strain gauges and load cells.
- Purpose: Identifies areas of high stress where support may need to be reinforced, helping maintain structural integrity as excavation progresses.
- Water Pressure and Groundwater Levels
- Description: Monitoring water pressure and groundwater levels with piezometers to track changes caused by excavation.
- Purpose: Essential for managing groundwater inflow, which can lead to erosion, settlement, or hydrostatic pressure that compromises the tunnel structure.
- Vibration Levels
- Description: Vibration sensors track construction-induced vibrations, particularly near sensitive structures.
- Purpose: Ensures vibrations remain within safe limits to avoid damaging nearby buildings or disturbing ecosystems.
- Air Quality and Environmental Monitoring
- Description: Measures dust, gas levels, and temperature to maintain safe working conditions.
- Purpose: Ensures compliance with occupational health standards by maintaining air quality and temperature at safe levels for workers.
ankihub_id
466a3932-03bf-43ee-b7ad-c5e222282a6e
Tags:
Suggested Changes:
Deck Changes (Suggestion to move the Note to the following Deck):
Field Changes:
Tag Changes: