This test method specifies the apparatus, instrumentation, and procedures for determining unconfined compressive strength of intact rock core specimens. This procedure is identical to ASTM D 2938 except that the cores are tested after cutting without grinding, …

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.

STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1. INTRODUCTION 2. TESTING OF INTACT ROCK FOR STRENGTH 2.1 Uniaxial Compression 2.2 Point Load Testing 2.3 Uniaxial Tension 2.4 Indirect Tension Tests 2.5 Shear Tests 2.6 Confined Compression Tests (Triaxial Tests) 2.7 Biaxial and Multiaxial Tests 2.8 Other Tests 3. PARAMETERS AFFECTING ROCK STRENGTH 4.

Analysis of uniaxial compressive strength UCS for the chosen rocks shows rather high standard deviation and non-uniformity coefficient and quite similar mean values which is surprising. The range of maximum stress that causes the collapse of the sample is very wide for all the rock types, which is typical for sedimentary rocks.

uniaxial compressive strength from the results of the point load test. 4. Test Results and Discussion 4.1 Uniaxial Compressive Strength Test Results The mean values of uniaxial compressive strength of the tested rocks are listed in Table 2. The strength values range from a low of 9.16 MPa for Marl to a high of 101.08 MPa for

rock sample uniaxial compressive strength and deformability. The interdependence of uncertainty contribution is analyzed and guides for improving measurement uncertainty are given. The achieved uncertainties are compared to typical uncertainties in the determination of concrete and metallic material compressive strength and deformability.

1.1 These four test methods cover the determination of the strength of intact rock core specimens in uniaxial and triaxial compression. Methods A and B determine the triaxial compressive strength at different pressures and Methods C and D determine the unconfined, uniaxial strength.

the uniaxial compressive strength (UCS), and to propose appropriate Is50 to UCS conversion factors for different coal measure rocks. The rock strength determined by the PLT, like the load frame strengths that they estimate, are an indication of intact rock strength and not necessarily the strength of the rock mass. THE UNIAXIAL COMPRESSIVE ...

Compressive Strength (UCS). It is one of the most basic parameters of rock strength, and most common determination performed for boreability predictions. The unconfined (or uniaxial) compressive strength (UCS) of a rock is a common measure of the strength of intact rock. It is normally measured on cylinders of rock core by

ingtheuniaxial compressive strength of rock for practical engineering purposes. Table IVlists the corres-ponding strength ranges for the strength classification of rock ma-terials8. ESTIMATION OF THE TRIAXIAL STRENGTH While determination ofthe uni-axial compressive strength ofrockis a simple matter, this is not true for the collection of the ...

Uniaxial compressive strength (UCS) is an important property of rock. Uniaxial compressive strength is widely used in the slope stability analysis and in the design of foundations and tunneling in rocks. Uniaxial compressive strength is also used in rock mass rating (RMR), Q-System, and in the determination of shear strength parameters of rock ...

where C 0 is uniaxial compressive strength and E is dynamic Young's modulus (see Stress strain relationships in rocks). Alternatively, we can include an empirical dependence of the internal friction angle, α, or the porosity, Φ .

The uniaxial compressive strength (UCS) of rocks is a key parameter in rock mechanics since it has a significant influence on the quality of rock masses and their behaviors.

In this study, 31 empirical equations are summarized that relate unconfined compressive strength and internal friction angle of sedimentary rocks (sandstone, shale, and limestone and dolomite) to physical properties (such as velocity, modulus, and porosity).

The main objective of present investigation is the analysis of the validity of uniaxial compression tests for indirect determination of long-term strength of rocks. From the various methods surveyed three groups have been selected for present experimental work.

Part 1. Suggested method for determination of the uniaxial compressive strength of rock material. Part 2. Suggested method for determining deformability of rock materials in uniaxial compression. In each case the scope, apparatus, procedure, calculations and reporting of results are dealt with. The ...

Determination of c and w of rocks from indirect tensile strength and uniaxial compression tests N. Sivakugan*1, B. M. Das2, J. Lovisa1 and C. R. Patra3 Cohesion (c) and friction (w) angle are the ...

towards any other strength parameter. (Bishop, 1966). 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

for determining the uniaxial compressive strength. Where is the compressive strength in MPa, and F is the load at failure in kN. According to Bell (1992), classification of intact rocks based on uniaxial compressive strength as suggested by ISRM is shown in Table 1. Table 1: Classification of intact rocks …

USING THE POINT LOAD TEST TO DETERMINE THE UNIAXIAL COMPRESSIVE STRENGTH OF COAL ... intact rock strength and not necessarily the strength of the rock mass. THE UNIAXIAL COMPRESSIVE STRENGTH TEST ... The point load test allows the determination of the uncorrected point load strength index (Is). It must be corrected

2.2.1 Determination of Rock Compressive Strength To determine the UCS of the rock samples, 54-mm diameter NX-size core specimens, having a length-to-diameter ratio of 2.5:1 were prepared as per ISRM stan-dards (Brown 1981). Each block was represented by at least three core specimens. The oven-dried and NX-size

scope: These four test methods cover the determination of the strength of intact rock core specimens in uniaxial and triaxial compression. Methods A and B determine the triaxial compressive strength at different pressures and Methods C and D determine the unconfined, uniaxial strength.

The determination of uniaxial compressive strength from point load strength for pyroclastic rocks. ... S.B. CelikEstimation of uniaxial compressive strength from point load strength, ... A. BasuEstimation of uniaxial compressive strength of rock materials by index tests using regression analysis and fuzzy inference system.

determination of concrete and metallic material compressive strength and deformability. Keywords: uniaxial compressive strength, deformability, rock samples, uncertainty 1. INTRODUCTION NE of the basic and most used methods of testing which is performed on rock samples is determination of uniaxial compressive strength and deformability. The

Dear Internet Archive Supporter, I ask only once a year: please help the Internet Archive today. ... Method for the determination of unconfined compressive strength of rock materials Item Preview remove-circle ... Method for the determination of unconfined compressive strength of rock materials Number of Amendments: Equivalence: Superceding:

the Uniaxial Compressive Strength and Deformability of Rock Materials PART 1. SUGGESTED METHOD FOR DETERMINATION OF THE 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.

of the uniaxial tensile and compressive strength of the rock and can easily be determined in the field or laboratory on rock lumps or cored samples. ... Note: N-size core is 50mm dia. Determination of Uniaxial Tensile Strength ...

A predictive model for uniaxial compressive strength of carbonate rocks from Schmidt hardness Abstract Uniaxial compressive strength (UCS) is considered to be one of the important parameters in rock engineering projects. In order to determine UCS, direct and …

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