Compressive Strength Intact rock . 334 Slake Durability to Estimate Rate of Weathering . 335 Point Load Test to Estimate Compressive Strength . 336 LESSON 3 ROCK STRENGTH and Its MEASUREMENT Learning Outcomes
Correlation of Mechanical Properties of Some Rocks in SouthEastern Nigeria ... methods to estimate the uniaxial compressive strength of rocks by using tests such as Los Angeles abrasion, Point load index, Schmidt hammer, slake durability and shore hardness tests. ... determination of natural density. The specimen volume was
at onehalf the peak uniaxial compressive strength. This modulus is found by drawing a tangent to the stress strain curve at 50 % maximum load, the gradient of this tangent being measured as Et50. Show on the stress strain curve the construction and calculations used in .
Ultrasonic techniques are a simple, costeffective, portable and nondestructive approach for evaluating the uniaxial compressive strength (UCS) of rocks. However, there are a number of factors affecting the ultrasonic pulse velocity ( V p) values. The main factors controlling the reliability of the method are surface irregularities of rock, microcracks and discontinuities, moisture content ...
The uniaxial compressive strength of intact rocks is extensively used in many rock engineering projects. Highquality core samples are required for the uniaxial compressive strength determinations. However, such core samples cannot always be obtained from weak rocks. For this reason, the predictive models are often employed to estimate indirectly.
The "unconfined" compressive strength is equal to 2 times the undrained shear strength. For all intents and purposes the ultimate bearing capacity is 6 times the undrained shear strength (where c in cNc is the undrained shear strength) or 3 times the unconfined compressive strength.
Hammer test to evaluate the intact rock properties [5, 6 and 7]. Later it has been adapted for determination of Uniaxial Compressive Strength of rock [8]. This research presents a new correlation obtained through a set of experimental tests carried out on three types of rocks belonging to three formations of different ages (Pila Spi
Determination of either compressive strength or de formability of a rock material, is time consuming, relatively expensive — if we consider that in order to produce a representative value for a large rock ex posure, a great number of specimens have to be tested —, and involves destructive tests. For these rea
Jan 01, 2009· Predicting the Uniaxial Compressive Strength and Static Young''s Modulus of Intact Sedimentary Rocks Using the Ultrasonic Test. Wavelength is the wave velocity in the rock specimen divided by the resonant frequency of the transducer. Commonly used frequencies range from 75kHzto3MHz ( ASTM 1984 ).
Rocks can get fail in multiple ways like tension, compression or shear and it is mainly depends on the presence of discontinuities, distribution and configuration of load. Engineers dealing with rock commonly use uniaxial compressive strength to design structures resting as foundation bed on rock.
that the strength of averaged blasted rock is a function of distance to blasting source (Akande Lawal, 2013), it is possible to express the rock mass weakening coefficient for uniaxial compressive strength of granite with regard to unbroken material in each zone as a function of energy intensity. The
Determination of c and φ of rocks from indirect tensile strength and uniaxial compression tests Sivakugan, N., Das, , Lovisa, J., and Patra, (2014) Determination of c and φ of rocks from indirect tensile strength and uniaxial compression tests.
Abstract. Pointload strength (Is) as a measure for the determination of rock strength and for estimating uniaxial (unconfined) compressive strength (UCS) are described and both put together and used for rock strength classification of brittle and hard rocks. The estimated pointload strength values of specimens of varying sizes and also...
Sep 28, 2015· Laboratory Uniaxial compression test Rock Mechanics Granit Result: 160MPa. Laboratory Uniaxial compression test Rock Mechanics Granit Result: 160MPa ... Compressive Strength of Cement ...
Akram M, Bakar ZA (2007) Correlation between uniaxial compressive strength and point load index for saltrange rocks. Pak J Eng Appl Sci 1(1):1–8 AlJassar SH, Hawkins AB (1979) Geotechnical properties of the carboniferous limestone of the Bristol area—the influence of petrography and chemistry ...
Uniaxial compressive strength (UCS) is considered to be one of the important parameters in rock engineering projects. In order to determine UCS, direct and indirect techniques are employed. In the direct approach, UCS is determined from the laboratory UCS test.
The uniaxial unconfined compressive strength (UCS) is an important mechanical property of the rock. mass having several implications in planning and de signing both underground and opencast coal mines.
Uniaxial compressive strength ( c), Emodulus and the factor m i in the HoekBrown failure criterion for rock masses Average values from tests Tests of rocks world of intact rock samples wide* Scandinavian rocks tested at SINTEF / NTNU *** Rating of the factor m i ** c E E c Number of tests c E E c Number
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.
Suggested Methods for Determining the Uniaxial Compressive Strength and Deformability of Rock Materials, 1972 October 15. Suggested Methods for Determining Shear Strength, 1974 February 16. Suggested Methods for Rockbolt Testing, 1974 March 17. Suggested Methods for Determining Hardness and Abrasiveness of Rocks, 1977 March 18.
Determination of Damage Constitutive Behavior for Rock Salt Under Uniaxial Compression The Open Civil Engineering Journal, 2015, Volume 9 77 by mode and magnitude [10].
In case of rock mass with favorable discontinuities, the net allowable bearing pressure may be estimated from: q a = q c * N j Where qWhere q c = average uniaxial compressive strength of rock coresaverage uniaxial compressive strength of rock cores N j = empirical coefficient depending on the spacing of the discontinuities 3+S/B 10 []1+300(δ/S) δ= thickness of discontinuity= thickness of ...
Uniaxial compressive strength (UCS) is considered to be one of the important parameters in rock engineering projects. In order to determine UCS, direct and indirect techniques are employed. In the direct approach, UCS is determined from the laboratory UCS test. In indirect techniques determine UCS based on the nondestructive test findings which can be easily and quickly performed and require ...
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