If the upper part of the rock, within a depth of about 5/4, is of lower quality, the value of this part should be used. Another practice that is normally followed is to base the allowable pressure on the unconfined compressive strength, qu, of the rock obtained in a laboratory on a rock sample. A factor of safety of 5 to 8 is used on qu to ...

This work examines the compressive strength of natural stones, as estimated by Uniaxial compressive strength tests (UCS) and respective non-destructive tests results (Schmidt Hammer Rebound test, SHR, or an Ultrasonic Pulse Velocity transmission, UPV). In practice, aiming to correlate the values of the UCS test with the …

(1): Fig. 4 Gypsum properties for the tested samples included online data (Papadopoulos et al. 1994) The results show a linear increase of tensile strength with unconfined compressive strength and ...

The ultimate compressive strength and corresponding failure strain are quantified. The test results show that Kalgoorlie basalt rock exhibits high sensitivity to …

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 ...

Basalt was used as an ornamental stone in any historic and ancient cities in Jordan. Measuring the uniaxial compressive strength (UCS) and the tangent Young's modulus (Et) in the laboratory requires premium quality specimens with special core dimensions. This research focuses on correlations both UCS and Et with Leeb Rebound …

Basalt was used as an ornamental stone in any historic and ancient cities in Jordan. Measuring the uniaxial compressive strength (UCS) and the tangent Young's modulus (Et) in the laboratory requires premium quality specimens with special core dimensions.

The thermal effects on dynamic strengths of rock were investigated in some literatures (Latham et al., 2006, Lindholm et al., 1974, Zhang et al., 2001). Lindholm et al. (1974) utilized the split Hopkinson pressure bar (SHPB) to measure the dynamic uniaxial compressive strength of Dresser basalt with ambient temperatures up to 527 °C (strain …

Uniaxial compressive strength (UCS) is the most used parameter to measure rock strength. However, restrictions in sampling large volume of material, the need of very large set of results and onsite characterisation of UCS non-destructively are requirements in many scientific and engineering investigations.

Close behind diabase in compressive strength come other fine-grained igneous rocks like Diorite, Gabbro, and Basalt. Interestingly, the one non-igneous rock in this super strong group is Quartzite. Quick Conversion: 350 MPa is over 50,000 psi!

tests indicated that the rock within each rock type was quite uni­ form. Results of the unconfined compressive strength tests on basalt y indicated, that as the loading rate …

Brown failure criterion for jointed rock masses is defined by: (1) where and are the maximum and minimum effective principal stresses at failure, is the value of the Hoek …

Empirical relationships for estimating Uniaxial Compressive Strength (UCS) of rock from other rock properties are numerous in literature. This is because the laboratory procedure for determination of UCS from compression tests is cumbersome, time consuming, and often considered expensive, especially for small to medium-sized mining …

Rock engineering tasks like tunnelling, dam and building construction, and rock slope stability rely heavily on properly estimating the rock's uniaxial compressive strength (UCS), a crucial rock geomechanical characteristic. As high-quality specimen are not always possible, scientists often estimate UCS indirectly. The primary objective of …

For basalt rocks, Malik et al. 12 investigated Deccan basalt rock and found the dynamic compressive strength between about 170 MPa and 260 MPa at a strain rate of about 400/s to 1600/s. Lindholm et al. 13 found a much lower dynamic strength of about 110 MPa to 125 MPa at a strain rate of about 600/s and 1100/s for Dresser basalt rock.

highest compressive strength value of 28.331 kgf/mm2 was obtained from the various parameters of 270 mesh-20% polyester- 1/20 catalyst and 270 mesh-25% polyester-1/30 catalyst.

Basalt is a type of igneous rock (volcanic magma hardens under the atmosphere), extrusive rock [21,22,23,24] and is usually originated in the East Asian countries. ... 4.1 Compressive strength. The compressive strength is commonly used for measuring the quality of concrete. It can be defined as the ability of a material to resist the load and ...

The effect of different unconfined compressive strengths (UCS) of rock on the extent of damage produced due to blast loading has been investigated. UCS representing dolomite, shale, sandstone, granite, basalt and quartzite medium has been investigated through a three-dimensional finite element model having dimensions of …

The compressive strength of the rock is approximately equal to the normal stress on a PCD compact insert measured during cutting process (Appl et al., 1993; Zacny and Cooper, 2007). The porosity ...

Keywords: Foundation footing, rock mass classification, rock class, compressive strength, safe bearing capacity (SBC). Introduction Basalt rock is an igneous rock which spreads to about 500000 square kilometer of India. In western part of area the basalt rock is known as Deccan trap. The Deccan Traps are formed about

The aim of this study is to understand the strength behaviour and fragment size of rocks during indirect, quasi-static and dynamic tensile tests. Four rocks with different lithological characteristics, namely: basalt, granite, sandstone, and marble were selected for this study. Brazilian disc experiments were performed over a range of strain rates …

Brown failure criterion for jointed rock masses is defined by: (1) where and are the maximum and minimum effective principal stresses at failure, is the value of the Hoek-Brown constant m for the rock mass, s and a are constants which depend upon the rock mass characteristics, and is the uniaxial compressive strength of the intact rock pieces. a

ABSTRACT:. The presence of vesicles within basalt has a negative impact on both the unconfined compressive strength (UCS) and deformation modulus (axial stiffness) of basalt specimens. Vesicular basalt specimens (diameters of 44.45 mm) were cored from surface boulders obtained from southern Nevada. Each basalt boulder has …

Typical values of strength parameters for intact basalt at ambient temperature (20°C) and negligible confining pressure are Young's modulus, 78±19 GPa; Poisson's ratio, …

The rock hardness of basalt is 6 on the Mohs scale, and can be seen through a combination of its compressive strength: 100-300 Mpa (Megapascal), its tensile strength: 10-30 Mpa, and its shear strength: …

Uniaxial compressive strength ( c), E-modulus and the factor mi in the Hoek-Brown failure criterion for rock masses. Average values from tests of intact rock …

The uniaxial compressive strength of rock is one of the most important mechanical properties of rock and is widely used in rock foundation design, rock mass quality classification, and rock mass engineering stability analysis [1,2].The method of determining the uniaxial compressive strength of rocks by standard laboratory rock …

For basalt rocks, Malik et al.12 investigated Deccan basalt rock and found the dynamic compressive strength between about 170 MPa and 260 MPa at a strain rate of about 400/s to 1600/s. Lindholm et al.13 found a much lower dynamic strength of about 110 MPa to 125 MPa at a strain rate of about 600/s and 1100/s for Dresser basalt rock.

As with the compressive strength tests, the vesicular basalt sample (bas-02) displays the largest range of measured values. For reference, these values are two to three orders of magnitude greater than the specific cutting strength for water ice drilled at 140 K, which was found to be 60 MJ/m 3 (or 0.06 J/mm 3 ) using a metal-toothed coring ...

Kulhawy and Goodman (1987) suggested that, as a first approximation, the unconfined compressive strength σ cm of rock masses be taken as 0.33σ c when RQD is less than about 70% and then linearly increase to 0.8σ c when RQD increases from 70% to (see Fig. 8), where σ c is the unconfined compressive strength of the intact rock.

The aim of this paper is to estimate the uniaxial compressive strength (UCS) of rocks with different characteristics by using genetic expression programming (GEP). …

For basalt rocks, Malik et al. 12 investigated Deccan basalt rock and found the dynamic compressive strength between about 170 MPa and 260 MPa at a strain rate of about 400/s to 1600/s. Lindholm et al. 13 found a much lower dynamic strength of about 110 MPa to 125 MPa at a strain rate of about 600/s and 1100/s for Dresser basalt rock.

1 Estimating compressive strength. 1.1 Relating compressive strength to porosity. 1.2 Critical porosity. 2 Compaction strength. 2.1 Determining rock failure envelopes. 3 Effect of clay …

In this study, the Back Propagation-Artificial Neural Network (BP-ANN) approach was utilized to predict the USC of Basalt Rock. Two ANN models were developed; one using the physical properties of rocks and the other one using the mechanical properties of rocks. ... Majdi A, Rezaei M (2013) Prediction of unconfined …

The point load test (PLT) is an accepted rock mechanics testing procedure used for the calculation of a rock strength index. This index can be used to estimate other rock strength parameters. The focus of this paper is to present the data analysis used to correlate the point load test index (Is 50) with the uniaxial compressive strength (UCS ...