TUDa Geotechnical Test Pit

Institute of Geotechnics, Technical University of Darmstadt, Darmstadt / Germany

Scope

The TUDa Geotechnical Test Pit (GTP) is a testing facility mainly for studying soil-pile interaction, although in principle, investigation of other geotechnical problems is also possible. The facility allows for near to full-scale testing (e.g., micropiles), as well as medium to large-scale model testing, thus being able to close the gap between small-scale testing, on one hand, and very rare and expensive in-situ testing, on the other. The facility also overcomes some of the limitations of centrifuge testing such as scalability of the soil/soil grain. As such, phenomena that are usually difficult to observe, as for instance soil-water interaction, can be better investigated. With its capability, the GTP can provide valuable contribution in the testing and validation of existing physical theories and numerical models, as well as in the development of new ones.

Specifications

Located in a 23 m x 23 m x 7 m (L x W x H) experimental hall of the Institute of Geotechnics, GTP has a total length and width of 19.5 m and 5 m, respectively. It consists of a stiff concrete box caisson, the lateral and bottom boundaries of which are rigid. It has two parts: a 6 m deep pit with plan dimension of 5 m x 4.35 m and a shallower pit 3 m in depth and plan dimension of 14.5 m x 5 m. In the latter pit, mobile walls can create smaller sections to allow for smaller-scale tests. In addition, a 4.3 m x 3 m (diameter x height) steel cylinder is available that has water connections at the bottom and thus where saturated testing can be performed.

The facility is equipped with vertical and horizontal actuators that can transmit static and dynamic force or displacement to the pile/foundation. Both the vertical and horizontal loading frames are movable and can be positioned at various places across the pit to accommodate different test and loading conditions. Below table gives further details on the technical specifications of the GTP.

Parameter	Value
Test Pit Dimension	19.5m x 5.0m (L x W)
Deep Pit	5.0m x 4.35m x 6.0 m (L x W x H)
Shallow Pit	14.5m x 5.0m x 3m (L x W x H)
Steel Cylinder	4.3m x 3m (D x H)
Test Type
Pit	Dry Testing
Steel Cylinder	Wet Testing
Test Material	Medium Sand
Model Preparation	Dry Pluviation; Moist Tamping-Layer Wise Compaction
Pile Type	Steel, Concrete, Timber
Typical Single Pile Size
Diameter	100 ≤ D ≤ 500 mm
Length	1000 ≤ L ≤ 4000 mm
Pile Groups	Feasible
Pile Installation	Drop Hammer; Vibrohammer; Wish-in-Place
Instrumentation	Load Cells, Displacement Transducers, Pore Water Transducers, Strain Gauges
Vertical Load
Static	Up to 2000 kN
Cyclic	Up to 100 kN @ 2 Hz
Horizontal Load
Static	Up to 1000 kN
Cyclic	Up to 100 kN @ 2 Hz

Facility Details
Name	TUDa Geotechnical Test Pit
Short Name	GTP
Owner	Institute of Geotechnics, Technical University of Darmstadt
Location	Darmstadt, Germany
Website	Click Here to Visit Site
Contact	Hauke Zachert
Head of facility	Hauke Zachert
Construction year	1970

Image Gallery

Experimental set-up showing the arrangement of the measuring devices

Overview of the TUDa Geotechnical Test Pit (A)

Overview of the TUDa Geotechnical Test Pit (B)

Overview of the TUDa Geotechnical Test Pit (C)

The Dry Pluviation System consisting of a sand hopper and four rigid tubes

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