Services / Bi-Directional Static Load Testing
BDSLT with the GRL-Cell
The GRL-Cell is a high capacity device installed within a deep foundation to statically load test the foundation. As the GRL-Cell is pressurized, it loads the foundation element in two directions. The load cell test pushes the cell up against the shaft resistance of the portion of the foundation element above the cell location. At the same time, downward against its shaft resistance below the cell as well as against the toe bearing or “base resistance.” Shaft and toe movements as well as embedded strain gage instrumentation are monitored for each applied load. An estimated top load movement curve is constructed from the measured shaft resistance load-movement and base resistance load-movement responses.
Bi-Directional Static Load Test Benefits include:
- High capacity static load cell test method for drilled shafts, bored piles, barrettes, and ACIP/CFA piles.
- Separates soil/rock resistance and movement data for shaft and toe.
- Determines magnitude of the mobilized shaft and toe resistances.
- Embedded strain gauges within the foundation determine the soil/rock resistance distribution along the foundation length for optimizing the foundation design.
- Not restricted by structural or geotechnical limit of load frame, reaction beams, or reaction piles.
- Multiple load cells can be employed at any depth location to apply larger loads.
Bi-Directional Static Load Testing (BDSLT) is standardized by ASTM D8169 – Standard Test Methods for deep foundations under Bi-Directional Static Axial Compressive Load.
Calculator
Enter the capacity you wish to mobilize, in Tons:
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Find out which APPLEs meet your needs, then contact the GRL office that serves your project location to discuss your specific project requirements.
Standard GRL-Cell Details*
GRL-Cell Capacity (tons) | Maximum Test Load (tons) | Outside Diameter (inches) | Maximum Stroke (inches) |
350 | 700 | 12 | 9 |
500 | 1000 | 15 | 9 |
750 | 1500 | 18 | 9 |
1100 | 2200 | 21 | 9 |
1500 | 3000 | 24 | 9 |
2000 | 4000 | 28 | 9 |
2500 | 5000 | 31 | 9 |
3500 | 7000 | 36 | 9 |
*GRL-Cell sizes are subject to change.
Learn More:
- GRL Engineers Services Suite Brochure
- Bi-Directional Static Load Test Brochure
- Montana Russell Street Bridge Case Study
Related Publications
Design and Construction Benefits of Performing a Bi-Directional Test on a Drilled Shaft in Sand, Gravel and Cobble Deposits
Modulus of Elasticity Impact on Equivalent Top-Loading Curves from Bi-Directional Static Load Tests