What is the uniaxial compression test?
Uniaxial compressive strength (UCS) is a key physical test relevant to iron ore crusher design and rock geomechanics for mining. Tests are typically performed on intact lengths of NQ, HQ, or PQ diamond drill core and record the maximum axial load sustained at the point of failure.
What are the in situ tests for testing the deformability of a rock mass?
In addition to these three types the following in situ deformation tests can be used: − flat jack tests; − cable jacking tests; − radial jack tests; − dilatometer tests; − pressure chamber. The effect of Poisson’s ratio is one of the parameters used for the calculation of modulus value in an in situ test.
What are the tests to be conducted in rocks?
There are a host of different tests you can run on rock from a variety of testing apparatus.
- Axial or Radial Deformation.
- Consolidation Testing.
- Constant Pressure Source.
- Constant rate of Loading (CRL) Consolidation.
- Constant rate of strain (CRS) Consolidation.
- Cyclic loading of samples under either load or strain.
What is Brazilian test in rock mechanics?
The Brazilian test is a simple indirect testing method to obtain the tensile strength of brittle material such as concrete, rock, and rock-like materials. In this test, a thin circular disc is diametrically compressed to failure.
How is UCS test done?
Test procedure Take two frictionless bearing plates of 75 mm diameter. Place the specimen on the base plate of the load frame (sandwiched between the end plates). Place a hardened steel ball on the bearing plate. Adjust the center line of the specimen such that the proving ring and the steel ball are in the same line.
Why UCS test is done?
The Unconfined Compression Test is a laboratory test used to derive the Unconfirmed Compressive Strength (UCS) of a rock specimen. Unconfirmed Compressive Strength (UCS) stands for the maximum axial compressive stress that a specimen can bear under zero confining stress.
What are in situ testing methods?
In situ testing Some examples of in situ tests include the standard penetration test (SPT), described below, the cone penetration test (CPT), field vane or vane shear test, dilatometer, pressure meter, and well pumping tests.
What are 5 ways to identify a rock?
Most minerals can be characterized and classified by their unique physical properties: hardness, luster, color, streak, specific gravity, cleavage, fracture, and tenacity.
What is uniaxial compressive strength?
A measure of a material’s strength. The uniaxial compressive strength (UCS) is the maximum axial compressive stress that a right-cylindrical sample of material can withstand before failing. It is also known as the unconfined compressive strength of a material because confining stress is set to zero.
What is uniaxial strength?
The uniaxial strength, also known as the unconfined compressive strength, of a rock may be regarded as the highest stress that a rock specimen can carry when a unidirectional stress is applied, normally in an axial direction to the ends of a cylindrical specimen. From: Encyclopedia of Geology, 2005.
How do you conduct a UCS test?
Test procedure
- Take two frictionless bearing plates of 75 mm diameter.
- Place the specimen on the base plate of the load frame (sandwiched between the end plates).
- Place a hardened steel ball on the bearing plate.
- Adjust the center line of the specimen such that the proving ring and the steel ball are in the same line.
What is meaning of in situ test?
Tests carried out on the ground, in a borehole, trial pit, or tunnel, as opposed to a laboratory test. An in situ soil test may be a vane test, dynamic penetration test, etc.
Why is in situ testing important?
In situ soil testing is essential for gaining soil property information, measuring groundwater pressure, gathering moisture content data, and other essential data points, all in which can be safety-critical in many different instances.
Why are in situ tests important?
Which test can be conducted in situ as well as in laboratory?
Clarification: CBR is a type of penetration test and there have been procedures developed to allow conducting the test both in-situ and in the laboratory.
What tests do geologists use to identify minerals in rocks?
Geologists use the following tests to distinguish minerals and the rocks they make: hardness, color, streak, luster, cleavage and chemical reaction. A scratch test developed by a German mineralogist Fredriech Mohs in 1822 is used to determine mineral hardness.