Campanella and Failmezger Inside Rutgers' CPT Truck
CPT Truck near Delaware Memorial Bridge
CPTU from truck at Wilson Bridge
DMT Performed from Trailer Rig being pulled by Large Trackhoe through Settling Pond in Texas
Elevated jack up barge with drill rig for stable working conditions pushing DMT at Cape Fear, North Carolina
Truck near Lincoln Memorial
Truck Rig near Washington Monument
Failmezger and Truck Rig near Space Shuttle at NASA at Cape Canaveral
Failmezger Performing BST in Cleveland
Failmezger Reading DMT Guages with 100 bar auxillary guage for 400 foot deep DMT Sounding
Failmezger, Marchetti and Bullock at ISC #1 Conference 1998 in Atlanta
Failmezger Saturating the Pressuremeter Probe at the Wilson Bridge
NASA Failmezger and Schmertmann Reading DMT Gauge
NASA Failmezger Schmertmann Crapps
Ronald Stidham Drilling the Pressuremeter Test Zone
Performing DMT from Braun Rig on Barge in North Dakota
Seismic CPT Truck overlooking Atlantic Ocean
Seismic DMT Data Collected at NASA
Our seafloor direct push system is placed on the mudline of a river and enables us to perform either cone penetrometer or dilatometer with true interval seismic tests, satisfying ASTM standards for a constant push rate of 2 centimeters/second. Waves and tides do not affect measurements—similar to performing tests on land.
The calibrated dilatometer test statically deforms the soil at an intermediate strain level, accurately modelling settlement of a spread footing or embankment. The membrane expands laterally and accurately models lateral capacity of a deep foundation. With thrust measurements, the dilatometer accurately calculates the plane strain angle of internal friction of a cohesionless soil using elastic half-space theory. We performed the deepest dilatometer test sounding in the world at Calvert Cliffs Nuclear Power Plant to a depth of 398 feet (2008) and organized the Second International Conference on the Flat Dilatometer Test (2006).
Data from CPT soundings accurately predict vertical pile capacities, as they model cylindrical piles. The CPT probe quasi-statically penetrates the soil at a constant 2 cm/sec rate measuring the tip, side friction and pore pressure using calibrated strain gauges and transducers. We use conical tip having a 600 apex angle with 10 cm2 projected cross-sectional area. 10 cm2 cones more accurately define soil layer boundaries than 15 cm2 cones because their stress bulbs are smaller.
Data from pressuremeter tests accurately predict vertical and lateral capacities for piles and settlement of shallow foundations based on the large data base of load tests and pressuremeter tests that the French Department of Public Works (LCPC) has collected. The quality of the PMT data depends on making a high-quality borehole with minimal disturbance to its sidewalls. Quality boreholes are best created using mud wash rotary techniques. Our engineers carefully monitor the rotation rate, advance rate and mud flow rate so that repeatable high-quality boreholes are created.
Dr. Handy invented this test to measure the horizontal coefficient of horizontal earth pressure at rest. From thin to thick steps from its bottom to top of the blade, the four round membranes expand laterally measuring the horizontal earth pressure. Our engineer computes the horizontal earth pressure at rest by extrapolating the plotted line of earth pressure versus blade thickness to the corresponding pressure at a zero blade thickness.
Vane Shear Test
Vane shear tests accurately measure the peak and remolded undrained shear strength of very soft to medium stiff clays. The vane turns at a constant rate of 0.1o/second for the first 90o to measure the peak shear strength, turns rapidly for 10 revolutions to remold the soil, and then turns at a constant rate of 0.1o/second for 90o to measure the remolded shear strength. The downhole torque motor, which eliminates parasitic rod friction, turns the vane clockwise. A computer controls the downhole torque motor and records the torque and rotation angle.
BAT Permeability Test
As water either exits or enters the glass vials inside the BAT probe, our engineer measures the pore water pressure versus elapsed time to theoretically compute the soil’s permeability (k < ~10-6 cm/sec) using Darcy’s Law.
For important projects, In-Situ Soil Testing, L.C. engineers perform high-quality tests making accurate measurements, enabling engineers to provide safe and also economical geotechnical designs saving the owner significant construction dollars. Our firm only has engineers that make the test measurements because they have the technical background to fully understand the geotechnical design and make decisions to get the best geotechnical parameter measurements in the field. Other competitors often have technicians performing the tests. Technicians can only collect numbers as they do not have the technical background to understand geotechnical design. (Read horror stories)
This website contains many references for Geotechnical, Structural and Civil Engineers to quickly find technical information about In-Situ tests and their design applications. (Which In-situ test should I use–a designer’s guide)
Founded by Roger A. Failmezger, P.E., F. ASCE in 1995, In-Situ Soil Testing, L.C. started with the purchase of a DMT/CPT truck originally owned by the University of Florida and designed by Dr. John Schmertmann (history of truck by Dr. Schmertmann). It was the first direct push truck in North America and still operates well today. The company has expanded significantly and owns a wide variety of in-situ soil and rock testing equipment. We routinely perform dilatometer, cone penetration, pressuremeter (soil and rock), borehole shear (soil and rock), and ko step blade tests. Unlike other firms who recommend only one test, because that is all that they own and can do, we recommend the most appropriate test(s) for your project’s needs.