Ground anchor testing

is a crucial process in geotechnical and structural engineering used to verify the load-bearing capacity and performance of anchors embedded in soil or rock. It ensures the safety and reliability of retaining walls, slopes, deep excavations, and other structures stabilized using ground anchors.

How it works?

The test involves applying a controlled tensile load to a ground anchor using a hydraulic jack, while simultaneously measuring displacement. The results are used to evaluate whether the anchor meets design requirements and behaves within acceptable deformation limits. The procedure can be performed as a proof test (for production anchors) or a performance test (on trial anchors).

Anchor head exposure

The anchor head is uncovered and cleaned to allow connection with testing equipment.

Equipment setup

A reaction frame and hydraulic jack are installed, along with dial gauges or displacement transducers

Load application

The anchor is gradually loaded in steps, and elongation is measured after each load increment

Data interpretation

Load-displacement curves are analyzed to confirm anchor compliance or identify possible failures

Process steps

Testing is typically required before anchor commissioning or periodically for monitoring long-term performance in safety-critical applications

Preparation

Site and anchor accessibility

Confirm safe access, clear the anchor head, and inspect for proper installation.

Calibration

Setup of hydraulic and measuring systems

Install testing rig, calibrate sensors, and verify system pressure accuracy

Loading procedure

Controlled test execution

Apply load per the testing standard (e.g., EN ISO 22477-5) and record anchor elongation

Final report

Compliance and performance analysis

Document test outcomes, confirm capacity, and compare with design criteria

Benefits

Structural safety assurance

Confirms the actual performance of anchors before load transfer.

Regulatory compliance

Meets industry and project standards (e.g., Eurocode, EN ISO).

Early defect detection

Identifies poorly grouted or damaged anchors prior to full-scale use.

Documentation for records

Creates formal evidence of anchor capacity and quality for engineering records.

Where it applies?

Geotechnics

Infrastructure

Tunnels

Energy construction

Railways

Have Questions? Contact Us

Frequently Asked Questions

What’s the difference between proof testing and performance testing of anchors?

Proof testing confirms that a working anchor meets load requirements. Performance testing is more comprehensive and typically performed on trial anchors to study full load behavior.

How long does a ground anchor test take?

A single test usually takes between 1 and 3 hours depending on the anchor type, load level, and number of load stages.

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