Monitoring in Soil Nailing and Anchorage Systems
What is Monitoring?
Monitoring in soil nailing or anchorage systems is essential to ensure construction quality and system performance. It involves short-term and long-term measurements to verify that the installed system matches design specifications and performs as intended.
Supervision Responsibilities
Monitoring can be done by employer engineers, contractor teams, or a combination. Typically, the employer manages performance monitoring. Proper supervision ensures a high-quality soil nail or anchorage system with reliable long-term behavior.
Monitoring Methods
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Short-term monitoring: Conducted during construction, including load testing (performance, proof load, creep) and displacement measurements of retaining walls and ground settlements.
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Long-term monitoring: Continues short-term measurements to track system behavior during operation.
Contractual Approaches to Monitoring
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Step-by-step method: Employer engineers fully supervise compliance with plans and specifications.
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Performance-based contracts: Contractor manages construction methods and materials, while employer verifies compliance.
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Design-build contracts: Contractor assumes full monitoring responsibility; employer performs random quality checks.
Preparations Before Construction
Supervisors should understand project requirements, site conditions, and hold coordination meetings with contractors. They must review geotechnical reports, contract drawings, and specifications to identify critical points.
Materials Inspection and Acceptance
Materials such as steel components, grout, concrete, drainage elements, and corrosion protection must comply with contract specifications and standards (e.g., AASHTO, ASTM). Visual inspections and test certifications are required before installation.
Storage and Handling
Materials must be stored and handled according to manufacturers’ recommendations to prevent damage or deterioration, especially corrosion protection coatings and grout materials.
