specimen, o, is the uniaxial compressive strength of a rock specimen having a different diameter, and D is the diameter of the specimen. ... pressive strength determinations on 50 mm diameter ...

Abstract:. It is common engineering practice to estimate the Unconfined Compressive Strength (UCS) of a rock, by multiplying Point Load Index test (IS50) results by a cor-relation factor. The IS50 to UCS correlation is reasonably accurate for crystalline or isotropic rocks but with weak sedimentary rocks, there is the potential for failure to …

Semantic Scholar extracted view of "Estimation of uniaxial compressive strength of rock materials by index tests using regression analysis and fuzzy inference system" by D. Mishra et al. ... model using a neural tree predictor that estimates the UCS with high accuracy and assess the effectiveness of different index tests in predicting …

Various correlations have been established with regard to rock strength indices for different types of rocks around the world. But in Sri Lanka, having several types of sedimentary and metamorphic ...

This paper presents a comparative evaluation of efficacies of different index tests and analysis techniques (i.e. regression analyses and fuzzy inference system) in …

pressive strength of jointed rock masses are reviewed and. evaluated, including the jointing index methods, the joint. ... of in situ rock mass strength; (2) different empirica l rela-

Compressive strength of rocks. Mechanical failure in rocks generally means either fracturing or permanent deformation as a result of compression. While many …

In general, rock mass strength depends on the strength of intact rock and the strength of rock discontinuities. In general, compared to intact rock, a rock mass has reduced …

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The unconfined compressive strength (UCS) of rocks, one fundamental parameter, is widely used in geotechnical engineering. Direct determination of the UCS involves expensive, time-consuming and destructive laboratory tests. These tests sometimes are difficult to be prepared for cracked rocks. In this way, indirect estimation …

InstitutionalAuthorName ISRM (International Society for Rock Mechanics) (1985) ArticleTitle Suggested method for determining point load strength Int. J. Rock Mech. Min. Sci. Geomech. Abstr. 22 51–60 Occurrence Handle 10.1016/0148-9062(85)92327-7

As a material for famous historical underground rock caverns, Longyou sandstone (LS) may fail under the combination of high loading rate and high temperature. The thermal damage induced by various heat-treatment temperatures (150, 250, 350, 450, 600 and 850 °C) is first characterized by X-ray Micro-computed tomography (CT) …

In this article, the existing empirical methods for estimating the unconfined com-pressive strength of jointed rock masses are reviewed and evaluated, including the jointing …

A modified split Hopkinson pressure bar (SHPB) numerical testing system is established to study the characteristics of rocks under simultaneous static and dynamic loading conditions following verification …

The following table provides a comprehensive list of compressive strength values for different rocks at standard room temperature (approximately 20°C or 68°F). Click on the icon to switch between SI (MPa) and US customary (psi) units.

Both the Newton inner friction effect and the Stefan effect enhance the rock dynamic strength, which explains the rise in the reduction coefficient with strain rate …

The strength of rocks and soil is a crucial design parameter in engineering projects, and it can be determined through various test methods such as uniaxial compressive strength, tensile strength ...

PDF | On Jan 1, 2015, Pâmmela Caroline Pinazzi da Silva Ribeiro and others published Correlation Between Uniaxial Compressive Strength and Brazilian Tensile Strength Using Different Rock Types ...

the rock masses the following parameters were recorded (following ISRM 1981): Table 1 Range of point load strength and rock mass classification for different geological formations Rock mass type GSI Rock structure Discontinuity surface Is 50 (MPa) average Is 50 (MPa) range I f (cm) average I f (cm) range Gneiss 35–60 S2, S3 D2, D3, D4 2.30 …

pressive strength of jointed rock masses are reviewed and ... values of a and e Table 2 Suggested values of joint strength parameter r for different values of r c (after Ramamurthy 1993)

Hoek and Brown (1980) have proposed the following correction equation for standardizing the uniaxial compressive strength of rock specimens to 50 mm diameter specimen strength, based on curve fitting to test results from the literature: Oso= (n.~s o, 5-0) (6) where os0 is the uniaxial compressive strength of a 50 mm diameter rock …

Uniaxial Compressive Strength (UCS) is considered as one of the most important parameters in designing rock structures. Determination of this parameter requires preparation of rock samples which is costly and time consuming. Moreover discrepancy of laboratory test results is often observed. To overcome the drawbacks of traditional …

Laboratory compressive experiments are regarded as the most accurate method to obtain the strength parameters of rock, and the rocks used for experiments are often dry. However, in geotechnical engineering, the rock masses are often under different hydraulic environments because of which rock strength decreases by varying degrees; …

The uniaxial compressive strength of rock is one of the most significant parameters required for analysis of rock mass, its characterization, and design of foundations. Direct determination of the uniaxial compressive strength of rock is time-consuming, expensive, and requires destructive laboratory or field testing. Therefore, …

Rock strength is estimated from two common laboratory techniques: uniaxial compressive strength tests and triaxial or confined compressive strength tests. Uniaxial …

Tests were carried out to study the effect of the coarse aggregate type on the compressive strength, splitting tensile strength, fracture energy, characteristic length, and elastic modulus of ...

The unconfined compressive strength (UCS) of intact rocks is an important geotechnical parameter for engineering applications. Determining UCS using standard laboratory tests is a difficult, expensive and time consuming task. This is particularly true for thinly bedded, highly fractured, foliated, highly porous and weak rocks. Consequently, …

In this work, tests were conducted on different types of Indian rocks, and an attempt was made to demonstrate the correlation among different rock types individually. Plotting all the data together, the relation is nearer to the general assumption of a conversion factor of 22–24 between PLI and UCS values.

To conduct the investigation, the researchers used RS2D, a rock-soil software, to examine the impact of different incremental displacements and confining stresses on the strength properties of ...

determined and they are uniaxial com pressive strength, ... VP has been widely used as a tool to predict the UCS of different rocks (Tugrul and Zarif, 1999;Kahraman, 2001;Sharma and Singh, 2008 ...