DEFORMABILITY OF INTACT ROCK Rock under Uniaxial Compression. Consider a rock specimen subjected to uniaxial compression. Let,a and,l be the axial and lateral (diametral) strains measured during the test and F be the applied axial stress. Figure 1 shows a .

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 = MPa and the failure envelope for this rock mass is plotted in Figure 1.

The most suitable rocks proven as road and building stones are fine grained granite, granite gneiss and charnockite because of their low water absorption, low flakiness and elongation indices, low abrasion values, higher strength values (tensile strength and unconfined compressive strength) and sound petrographic characters.

A 450 mm diameter sample with inclined bedding planes was cored and tested in uniaxial compression until failure with load and displacement measurements. The aim of the test is to determine strength and deformation parameters and correlate them with results of smallscale UCS tests of the same sample.

Introduction. Intact rocks' uniaxial compressive strength (UCS) is the main parameter used for almost all rock mechanical studies in most civil, geological and mining projects (Bieniawski 1974; Cargill and Shakoor 1990); however, regular geometry, highquality core samples are necessary for determining UCS Standard cores cannot always be extracted from weak, highlyfractured, thinlybedded ...

is also an important failure criterion of rock fracture. Compressive failure strength is one of the most widely investigated material properties of rock salt. It is now fairly well established that fracture of rock salt under uniaxial compression involves nucleation of microcracks from

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 strength

Measurement Uncertainty in Testing of Uniaxial Compressive Strength and Deformability of Rock Samples. This paper describes instrumental measurement uncertainties and their influence on the result obtained from determination of rock sample uniaxial compressive strength and deformability.

Uniaxial compressive strength (UCS) of intact rock is particularly important in rock mechanic studies, especially for those involving civil and mining projects. However, the determination of UCS using direct test is generally expensive, time consuming and almost impossible in preparation of samples for highly weathered sedimentary rocks.

ingtheuniaxial compressive strength of rock for practical engineering purposes. Table IVlists the corresponding strength ranges for the strength classification of rock materials8. ESTIMATION OF THE TRIAXIAL STRENGTH While determination ofthe uniaxial compressive strength ofrockis a simple matter, this is not true for the collection of the ...

Uniaxial Compressive Strength of Intact Rock Core Specimens. Method C is used for obtaining strength determinations. Strain is not typically measured; therefore a stressstrain curve is not produced.

load is used to calculate the point load strength index. The point load strength index can be used to classify the rocks. A common method used is by estimating the uniaxial compressive strength. 5. Significance and Use The uniaxial compression test (seeTest Method D 7012) is used to determine compressive strength of rock specimens.

Uniaxial compressive strength test Uniaxial compressive strength tests were conducted on prepared core samples, which had a diameter of 38 mm and a lengthtodiameter ratio of 2– The stress rate was applied within the limits of – MPa/s. At least five tests were done for each rock type and the average value was recorded as the UCS. Figure 4 shows some samples that failed in

Automatic system for uniaxial and triaxial tests on rock cores, including STRESS PATH and PERMEABILITY determination Layout of the automatic system for uniaxial and triaxial tests (with stresspath analysis) and permeability determination Hoek cell fitted with permeability end cups for permeability test Screenshot of a stresspath triaxial test on rock performed with the ADVANCED system (load vs. .

The relationships between Young's modulus and uniaxial compressive strength of rocks from the Haute Garonne, France, were investigated. The relationships between these properties are described by simple regression analyzes. The results indicate an excellent correlation obtained between the modulus of elasticity and uniaxial compressive strength.

Aug 11, 2013· Reference ISMethod for the determination of unconfined compressive strength of rock materials Objective The objective of this test is to determine unconfined compressive strength of rock. This test is primarily done to classify the rock on the basis of strength. Apparatus used Name of equipment Capacity Least count/Accuracy Loading Machine 5000 kN N Vernier [.]

A STUDY ON MODES OF ROCK FAILURE UNDER UNIAXIAL COMPRESSION ... Determination of compressive strength 25 X Ray analysis 26 SEM / EDX Analysis 28 . Chapter 4 29 ... Failure in Uniaxial Compression: Rock examines under uniaxial compressive anxiety, on .

logarithmic relation between resistivity and uniaxial compressive rock strength. The compressive strength increases with increasing resistivity. Bilim et al (2002) carried out electrical measurements on artificial rocks and found that compressive strength, tensile strength, point load strength and density strongly correlated with voltage drop.