Load Testing

Foundation Test Group specializes in applied deep foundation axial compression & tension load testing (ASTM D1143 and ASTM D3689).  On average we perform over 100 static axial compression and tension load tests per year. Depending on the soil conditions or contract requirements, FTG can perform axial compression or uplift load testing under maintained or quick load test procedures. We have tested all deep foundation types including drilled shafts, driven piles, auger cast piles, helical anchors, hollow core anchors, tiebacks and micropiles. FTG utilizes state of the art automated data loggers to safely and accurately record the load test results and accelerate the load test analysis and reporting process. FTG also incorporates strain gauge data from the load test to fully separate side shear capacity from end bearing and determine the side shear capacity of different soil/rock formations encountered during the foundation installation. Inhouse, FTG can perform static load tests up to 2,000 kips total test capacity. FTG utilizes the results of the load test to help value engineer the most economical foundation solution for the project. 

Based on client needs for transportation projects in both Maryland and Virginia we have provided innovative turnkey load testing of existing foundations in confined space environments by tunneling under existing bridge piers to determine the ultimate load carrying capacity of existing foundations installed up to 40 years previously. 

Lateral load testing of deep foundations (ASTM D-3966) is routinely performed by FTG Engineers.  Testing of drilled shafts, driven piles, micro piles, auger cast piles and helical anchors are performed regularly.  Lateral load testing provides a field verification of the lateral design performed by using design programs such as L Pile.  FTG, Inc. is a leader in the industry using inclinometers, shape arrays and other advanced instrumentation during lateral load tests, so that we can compare the results of lateral load test depth deflection curves to refine design lateral analysis curves in order to value engineer the most practical and cost-effective structural steel design. 

During lateral load testing, FTG utilizes state of the art automated data loggers which safely and accurately record the load test results and then accelerate the load test analysis and reporting process.

Bi-Directional Load Testing (ASTM D8169 Standard Test Methods for Deep Foundations Under Bi-Directional Static Axial Compressive Load) provides high capacity results for deep foundations. FTG has consistently utilized the results of the bi-directional load testing to help value engineer the most economical foundation solutions for a project. 

The use of sacrificial jacks embedded within the foundation elements allows for high capacity load testing to be safely performed.  Bi-direction load testing typically is performed until one of four conditions occurs: ultimate end bearing capacity is reached, ultimate side shear capacity is reached, the ultimate jack capacity is reached or if a proof test is performed, the maximum test load is achieved.

Because the sacrificial jack is embedded in the foundation, the applied loads can be significantly higher than a static reaction system since we are utilizing the soil/rock structure for the test reaction, as opposed to the structural limits of a beam and reaction pile system or kentledge setup.  FTG also incorporates strain gauge design into the load test to fully separate side shear capacity from end bearing and determine the side shear capacity of different soil/rock formations encountered during the foundation installation. Upon completion of the bi-directional load test, the jack can then be grouted in place to allow the foundation member to carry permanent structural loads.

We routinely take the clients goals for the foundation design and testing, apply the best methodology to maximize test performance and implement cost savings for both the owners and contractors.