We conduct all kinds of static (vertical/horizontal) load tests. Usually, at the request of the client, these are based on the guidelines issued by the German Geotechnical Society (DGGT) working group (AK) 2.1. and on the DIN 1054 standard, or on applicable national requirements.
As an option, we can conduct the test under path or force control. In cohesive soil especially, a great deal of time can be saved by path-controlled testing (likewise in accordance with DGGT AK 2.1).
We conduct load tests on
diaphragm wall panels
soil (load plate)
ground nails and
At the start of the test a loading programme is specified. Usually, the desired maximum test load is applied in eight stages. A minimum time is waited after each load stage and the creepage criterion is checked. If the criterion is met, the next load stage up is applied. This is continued up to the maximum test load.
In relation to cohesive soils, attaining the specified creepage criterion can considerably prolong the test.
In path-controlled testing, the rate of displacement of the pile head is preset rather than the load. When the working load is reached, the pile is pressed into the ground at a constant rate and the applied load is recorded. This considerably speeds up testing in cohesive soil.
Tensile tests are usually conducted on anchors and micro piles with preset thread bar anchors/profile steels or strands.
Tensile testing can only be carried out up to 0.9 times the yield stress of the tendon.
Compression tests are classified as dead-load tests or tests with tension elements
depending on the type of reaction system.
In the case of reaction systems with tension elements, there are different loading
structures depending on the test load and the site conditions. The different structures
are beam and cruciform construction and load crowns.
In tests with dead load, there are one or more hydraulic cylinders between the pile
head and the thrust block by which the individual load stages can be applied.
with tension piles
Cruciform beam construction
Under higher test loads a cruciform structure comprising multiple beams is
Higher loads can be applied by arranging multiple load crowns one on top of the other.
Piles are subjected to load transverse to the pile axis in order to verify the bearing
capacity in the horizontal direction.