uniaxial compressive strength of rock

Uniaxial Compressive Strength - an overview ...

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.

Read More

Read More

THE UNIAXIAL COMPRESSIVE STRENGTH OF SOFT ROCK

Soft rock is a term that usually refers to a rock material with a uniaxial compressive strength (UCS) less than 20 MPa. This low strength range might be influenced by physical characteristics ...

Read More

Read More

Prediction of uniaxial compressive strength of rock ...

2015-1-1  Unconfined compressive strength (UCS) determination of rocks plays a significant role in the analysis of geotechnical problems such as dam and tunnel design, drilling and mechanical rock excavation. The UCS of the rock is determined directly by testing the compressive behavior of the rock specimens under axial load in the laboratory.

Read More

Read More

Evaluation of empirical estimation of uniaxial

2020-4-1  The uniaxial compressive strength (UCS) of rock is an important parameter required for design and analysis of rock structures, and rock mass classification. Uniaxial compression test is the direct method to obtain the UCS values.

Read More

Read More

Correlations of Uniaxial Compressive Strength of Rock

There has been a lot of interest in the relationship between uniaxial compressive strength (UCS) and other properties of rock. Evaluation of rock parameters such as cohesion, Young’s modulus, angle of friction, and Poisson’s ratio is required for numerical modeling of rock.

Read More

Read More

Uniaxial compressive strength versus Global strength

2018-9-21  Uniaxial compressive strength of intact rock sci = 100 MPa Geological Strength Index GSI = 40 Constant mi = 10 Using the program RocLab1, the uniaxial compressive strength of the rock mass is calculated as sc = 3.307 MPa and the failure envelope for this rock mass is plotted in Figure 1.

Read More

Read More

Suggested Methods for Determining the Uniaxial

2005-10-18  UNIAXIAL COMPRESSIVE STRENGTH OF ROCK MATERIALS 1. SCOPE This method of test is intended to measure the uni- axial compressive strength of a rock sample in the form of specimens of regular geometry. The test is mainly intended for strength classification and characterization of intact rock. 2. APPARATUS (a) A suitable machine shall be used for applying

Read More

Read More

Rock Strength (Shear strength, compressive strength ...

2011-3-28  Uniaxial Compressive Strength (UCS), σ′3= 0 Tensile strength (pure tension, hard for rocks!) Indirect tensile test (Brazilian test) Point-load, beam-bending, scratch test, needle Direct shear tests of a planar surface A joint surface, bedding plane, fault plane, sheared plane, lithologic interface, etc.

Read More

Read More

8. STRENGTH OF SOILS AND ROCKS

2009-2-23  In the case of concrete, the compressive strength is the most commonly measured strength parameter and this is also true of rock specimens. For the uniaxial or unconfined compressive strength test a right circular cylinder of the material is compressed between the platens of a testing machine as illustrated in Fig. 8.1.

Read More

Read More

STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1 ...

2006-3-19  between strain hardening and softening is called the unconfined compressive strength of the rock and is denoted as C o or q u . Failure takes place continuously from C to D during which

Read More

Read More

(PDF) UNIAXIAL COMPRESSIVE STRENGTH OF

The Uniaxial Compressive Strength (UCS) and deformability of jointed rock are required to design structures on or in jointed rock mass. These rock masses depend on the number and orientation of ...

Read More

Read More

Numerical Simulation of Rock Uniaxial Compressive

2021-1-15  Rock engineering occupies an important position in the 21st century. In the face of rock engineering disasters, we are only looking for the essential problems through experiments on rocks, but rock experiments cannot be realized in large numbers, so the article uses numerical simulation software RFPA (Realistic Failure Process Analysis) 2D Basic to simulate rock under different size conditions ...

Read More

Read More

The Uniaxial Compressive Strength of Soft Rock

Soft rock is a term that usually refers to a rock material with a uniaxial compressive strength (UCS) less than 20 MPa. This low strength range might be influenced by physical characteristics, such as size, saturation, weathering and mineral content. A number of uniaxial compression tests have been conducted onto soft rock samples. The results showed that the strength reduced significantly in ...

Read More

Read More

Uniaxial Compression Mechanical Properties of Rock

2020-6-23  The difference between the soft and hard parts of the artificial samples is not defined by absolute strength as the traditional sample. It is considered that the uniaxial compressive strength of the hard rock is more than 1 time of that of the soft rock, so the soft rock and hard rock

Read More

Read More

Uniaxial compressive strength versus Global strength

2018-9-21  Uniaxial compressive strength of intact rock sci = 100 MPa Geological Strength Index GSI = 40 Constant mi = 10 Using the program RocLab1, the uniaxial compressive strength of the rock mass is calculated as sc = 3.307 MPa and the failure envelope for this rock mass is plotted in Figure 1.

Read More

Read More

Correlation between Uniaxial Compressive Strength and ...

2008-6-6  qu = Uniaxial Compressive Strength of rock. Is(50) =Point Load Index for 50 mm diameter core. Broch and Franklin [5] reported that for 50 mm diameter cores the uniaxial compressive strength is approximately equal to 24 times the point load index. They also developed a size correction chart so that core of various diameters could be used for ...

Read More

Read More

Rock Strength (Shear strength, compressive strength ...

2011-3-28  1-F Rock Strength How We Measure Rock Strength Simple measurements (called “index ” tests) Uniaxial Compressive Strength (UCS), σ′3 = 0 Tensile strength (pure tension, hard for rocks!) Indirect tensile test (Brazilian test) Point-load, beam-bending, scratch test, needle Direct shear tests of

Read More

Read More

A STUDY ON MODES OF ROCK FAILURE UNDER

2014-7-16  work. With due need, this paper analyzes the failure modes of rock under uniaxial compression test. The nature of the principal failure mode is changed from axial splitting and shearing along a single plane to multiple fracturing in the case of rock specimens as uniaxial compressive strength (UCS) increases.

Read More

Read More

ASTM D7012 - 14e1 Standard Test Methods for

5.2 Method C, uniaxial compressive strength of rock is used in many design formulas and is sometimes used as an index property to select the appropriate excavation technique. Deformation and strength of rock are known to be functions of confining pressure. Method A, triaxial compression test, is commonly used to simulate the stress conditions under which most underground rock masses exist.

Read More

Read More

Correlation of Sonic Travel Time to the Uniaxial ...

2012-8-30  uniaxial compressive strength measurements made on core samples from the same holes. In McNally’s classic original study, conducted in 1987, sonic velocity logs and drill core were obtained from 16 mines throughout the Australian coalfields. The overall correlation equation McNally obtained from least-squares regression was: UCS = 143,000 x e

Read More

Read More

(PDF) Uniaxial Compressive Strength Of Composite

The uniaxial compressive strength of intact rock specimen of homogenous and isotropic rocks such as granite, sandstone, basalt and etc had been well published. Substantially, all the findings were based on the study conducted on a single rock type that ranges from hard to weak rocks. Unfortunately, little study has been conducted on anisotropic ...

Read More

Read More

Numerical Simulation of Rock Uniaxial Compressive

2021-1-15  Rock engineering occupies an important position in the 21st century. In the face of rock engineering disasters, we are only looking for the essential problems through experiments on rocks, but rock experiments cannot be realized in large numbers, so the article uses numerical simulation software RFPA (Realistic Failure Process Analysis) 2D Basic to simulate rock under different size conditions ...

Read More

Read More

The Uniaxial Compressive Strength of Soft Rock

Soft rock is a term that usually refers to a rock material with a uniaxial compressive strength (UCS) less than 20 MPa. This low strength range might be influenced by physical characteristics, such as size, saturation, weathering and mineral content. A number of uniaxial compression tests have been conducted onto soft rock samples. The results showed that the strength reduced significantly in ...

Read More

Read More

Uniaxial Compression Mechanical Properties of Rock

2020-6-23  The difference between the soft and hard parts of the artificial samples is not defined by absolute strength as the traditional sample. It is considered that the uniaxial compressive strength of the hard rock is more than 1 time of that of the soft rock, so the soft rock and hard rock

Read More

Read More

Correlations of Uniaxial Compressive Strength of Rock

There has been a lot of interest in the relationship between uniaxial compressive strength (UCS) and other properties of rock. Evaluation of rock parameters such as cohesion, Young’s modulus, angle of friction, and Poisson’s ratio is required for numerical modeling of rock.

Read More

Read More

Correlation between Uniaxial Compressive Strength and ...

2008-6-6  qu = Uniaxial Compressive Strength of rock. Is(50) =Point Load Index for 50 mm diameter core. Broch and Franklin [5] reported that for 50 mm diameter cores the uniaxial compressive strength is approximately equal to 24 times the point load index. They also developed a size correction chart so that core of various diameters could be used for ...

Read More

Read More

Evaluation of the ratio between uniaxial compressive ...

2018-6-12  Evaluation of the ratio between uniaxial compressive strength and Schmidt hammer rebound number and its effectiveness in predicting rock strength Levent Selçuk Department of Geological Engineering, Architectural-Engineering Faculty, Yuzuncu Yil University, Van65080, Turkey Correspondence [email protected]

Read More

Read More

Rock mass properties - Rocscience Inc.

2018-9-21  uniaxial compressive strength ci of the intact rock pieces, value of the Hoek-Brown constant m i for these intact rock pieces, and value of the Geological Strength Index GSI for the rock mass. Intact rock properties For the intact rock pieces that make up the rock mass, equation (1)

Read More

Read More

Using the point load test to determine the uniaxial ...

Point load testing is used to determine rock strength indexes in geotechnical practice. The point load test apparatus and procedure enables economical testing of core or lump rock samples in either a field or laboratory setting. In order to estimate uniaxial compressive strength, index-to-strength

Read More

Read More

Correlation of Sonic Travel Time to the Uniaxial ...

2012-8-30  uniaxial compressive strength measurements made on core samples from the same holes. In McNally’s classic original study, conducted in 1987, sonic velocity logs and drill core were obtained from 16 mines throughout the Australian coalfields. The overall correlation equation McNally obtained from least-squares regression was: UCS = 143,000 x e

Read More

Read More