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Pile Bi-Directional Axial Compressive Load Test.

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Innovative Solution for Testing Large, Deep, and High-Capacity Piles

Pile Bi-Directional Axial Compressive Load Test (BDSLT) is an advanced static load testing method used for assessing very large and deep pile foundations, particularly in projects where conventional top-down testing becomes impractical or cost-prohibitive. Instead of relying on heavy reaction systems, BDSLT uses a hydraulic jack assembly embedded within the pile—loading the pile in two opposite directions simultaneously. This approach provides high precision, efficiency, and safety, making it an essential test for major infrastructure and high-load foundations. At Global Lab, we conduct BDSLT as per ASTM D8169 and IS 2911 (Part 4) standards, employing advanced hydraulic instrumentation and data acquisition systems to deliver accurate, real-time results.

Why BDSLTMatters.

Ability to Test Extremely High Loads.

The BDSLT can safely apply massive test loads that would otherwise require an enormous and expensive top-down reaction setup. By using the pile and surrounding soil as the reaction system, the embedded hydraulic jack applies an upward load (mobilizing skin friction above) and a downward load (mobilizing skin friction and end bearing below). This allows testing of high-capacity piles that exceed the limitations of conventional load tests.

Direct Separation of Skin Friction and End-Bearing

A key advantage of this method is the ability to independently measure the skin friction and end-bearing resistance within a single test. When the internal jack is activated, it records upward and downward movements separately—giving engineers precise insight into how the pile transfers loads through different soil layers. This data helps optimise pile design, reducing material use while ensuring safety and reliability.

Cost and Time Efficiency

Unlike traditional static load tests that require heavy kentledge setups or anchor piles, the BDSLT eliminates external reaction systems entirely. It saves significant setup time, equipment costs, and space, making it ideal for sites with logistical challenges or tight project schedules. Testing can be completed faster and with far fewer resources, without compromising accuracy.

Ideal for Deep or Rock-Socketed Piles

In cases where piles extend deep into stiff strata or rock, conventional top-down tests often fail to mobilise full resistance. By positioning the hydraulic jack assembly within the pile at depth, the BDSLT can directly activate and measure resistance in lower soil or rock layers. This ensures accurate assessment of total pile capacity—especially in bridges, offshore structures, and high-rise foundations.

NDT TESTING

GL Advantages.

Accredited Facility: NABL-accredited laboratory with traceable calibration and stringent Quality System procedures.

Compliance with Standards: Tests conducted in accordance with relevant IS/ASTM/RILEM/EN standards.

Experienced Personnel: Technologists and experts who interpret results and recommend mitigation strategies.

Rapid and Reliable Reporting: Valid reports that comply with relevant standards.

Testing Capabilities: Lab and on-site testing, along with post-test consulting services.

Global Lab Advantage.

Accredited facility.
Standards compliance.
Experienced analysts.
Fast, reliable reporting.
Field + Lab capability.

Applications

Large-diameter bored piles and barrettes in high-rise and bridge foundations.
Deep foundations socketed into rock or dense strata.
Pile capacity evaluation for offshore and marine structures.
Mega infrastructure projects with very high load demands.
Optimization of pile design through detailed load transfer analysis.
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Pile Bi-Directional Axial Compressive Load Test
Pile Bi-Directional Axial Compressive Load Test
Pile Bi-Directional Axial Compressive Load Test

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Global Lab provides comprehensive testing for construction and engineering materials, including concrete, cement, steel, aggregates, bitumen, soil, tiles, paver blocks, and other civil and infrastructure materials. We also handle customized tests as per client or project specifications.

Yes. Our team is equipped with mobile testing facilities and field instruments for on-site sampling, inspection, and testing — ensuring quick and reliable results without disrupting your project timelines.