Instrumented Soil Nail / Rock Bolt Pull Out Test
The Instrumented Pull Out Test using DFOS is an advanced method for evaluating the load transfer behavior and performance of soil nails, rock bolts, and ground anchors under tensile (pull-out) loads.
By integrating fiber optic sensing technology, this test provides continuous, high-resolution strain measurements along the entire length of the nail or bolt, offering unmatched insight into how the load is distributed through the ground or grout
.
Objectives:
- Obtain load distribution along the length of the soil nail / rock bolt.
- Verify geotechnical design parameter such as unit skin friction.
- Establish the load movement relationship
Key Benefits:
- Continuous and precise strain measurement along the entire length of the sensing cable
- Detects local defects or weak bonding include at mechanical coupler location
- Enables accurate load transfer visualization
- Suitable for field testing and long-term monitoring
Applications:
- Testing of soil nails, rock bolts, ground anchors and shear dowel
- Slope stabilization and retaining structure assessments
- Tunnel support and underground structure analysis
