Those who are familiar with the soil testing probably already know the testing methods of soil. One of the common methods of testing the soil is the standard penetration test which is best known for its simplicity. But the main disadvantage of this method is the inaccuracy. More advanced options have been developed in the industry so far. In this list, the tri axial testing method is the most convenient and advance.
Table of Contents
What Is a Tri axial Testing?
In order to conduct Tri axial Testing, you will need a Tri axial Apparatus such as Digital Tri axial Test Apparatus which is made up of the Tri axial cell, universal testing machine, and panel for controlling the pressure. For testing the soil and other granular materials like sand, the material is placed in a cylindrical plate sleeve and merged into a bath of water or any other liquid which puts pressure on the sides of the cylinder. On the top of the cylinder, a circular place is placed called the platen. The distance the platen travels are measured along the net change in the volume of the material.
The tri axial compression test carried out in two stages:
First Stage: In this, the soil sample is set in the tri axial cell and confining pressure is applied.
Second Stage: In this, additionally axial stress is applied which induces shear stresses in the sample.
Tri axial Testing is used to measure the properties of the soil but it also can be used on more solid materials of soils. Basically, this method is used to solve the problem of stability by:
- Measuring stress/ strain behavior
- Determining the shear strength of soil
- Monitoring the internal response of the particulate medium
It is also used for pore water pressure measurement and determining contractive behavior, which is very common in sandy soil. This soil testing method is well suited for helping the engineers improve the designs while limiting the failure of structures. They can understand the behavior of the soil and create a proper understanding of the material and assessment of the characteristics of a building site.
Primary Components or Apparatus Used:
- Tri axial cell
- Pedestal and top Cap
- Rubber membrane, O-rings, and porous discs
- volume controller
- velocity controlled load frame
- data acquisition unit
- axial displacement transducer
- an internal submersible load cell
Benefits of Tri axial Testing Method
Primary methods of this testing include its versatility over another test. Moreover, Digital Tri axial Test Apparatus testing is very useful for determining deformations where Poisson’s ratio of the material is important.
- Other benefits are like the soil samples are subjected to uniform stresses and strain.
- Direct combinations of confining and axial stresses and strains
- Drained and undrained tests can be carried out
- Pour water pressure can be measured in undrained tests
- The complete stress-strain behavior can be determined.
Availability in the Market:
This machine is easily available in the market and can be purchased from various places. You can also purchase separate components of this machine at a cheap price.