The foundation of a building or any other infrastructure should be strong because the whole building would stand on the soil. The soil may seem fine by just looking at it, but during the construction or after its completion, the soil could shift because of the pressure of the building. To ensure this, triaxial testing is done on the soil, rocks, or sand.
What is triaxial testing?
Triaxial testing refers to soil testing wherein the soil is subject to a lot of pressure to test its quality and establish the shear strength. It is used to determine the drainage quality and pour water pressure of the soil. All these features are tested with triaxial testing apparatus.
Types of triaxial testing
- Consolidated-drained: no pore pressure is made.
- Consolidated-undrained: higher pore pressure.
- Unconsolidated-undrained: only includes the shear phase.
Where is it used?
- Construction industry
- Oil and gas industry
- Forecast structural destruction during a natural disaster
Following is the equipment used for triaxial testing-
- Triaxial cells
The specimen is kept in a cell that contains fluid. The vertical pressure of the cell and perpendicular pressure of water checks the specimen’s strength, pore pressure, and drainage quality. The intensity is escalated until the specimen cannot bear the stress.
- Triaxial load frames
These are utilized to establish the shear strength of the trial subject. The subject is put down in the cells containing fluid. This cell is kept in the load frames where pressure is forced vertically to establish the strength, slope stability, resistance, and bond of the test subject.
- Pressure control panel
The panel controls the air and fluid pressure in the cells. The panel can be automatic or manually operated. The automated system gives exact control for the distribution of the air and fluid, whereas the manual panel controls the air, fluid, or vacuum in the testing system.
Several add-ons are accessible for this testing, like top cap, base set, and pedestal. They are accessible in different types like steel or anodized aluminium. Other accessories include porous stones, latex membranes, and O-rings. This will facilitate the testing and customize it.
- Load and displacement calculation
The computation load and dislocation can be done by measuring tools. It calculates the pressure and strain of the testing subject throughout the test.
The data is recorded in the data acquisition software. The software records the vertical load, pore pressure, and soil sample automatically. The pore pressure can also be recorded manually. The software can be operated on a computer, tablet, and laptop. Information about the testing agency, the organization’s logo, and machinery details can be mentioned in the reports.
- Sample preparation
It includes the tools required for the preparation of specimens for testing of the subject. These tools must conform to international guidelines. It includes an adjustable sample sharpener, cutting edges with wire blade, container to hold the subject in place while it is trimmed, container to remold specimen, length comparator, and much more.
For accurate testing of soil, rock, or sand to determine its strength, get the whole set of triaxial testing instruments. This is to ensure that the results are accurate.