Correlation between point load index and compressive strength for quartzite rocks

Singh, Virendra; Singh, Divya

doi:10.1007/bf00466369

Cited by 71 publications

(16 citation statements)

References 5 publications

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“…Although, the point load strength index (Is 50 ) is not easily related with UCS, it is the quickest and the cheapest determined laboratory and field strength parameter. Many studies, for all rock types, have shown that there is no single factor relating the point load strength index with UCS (D' Andrea et al, 1964;Broch and Franklin, 1972;Bieniawski, 1975;Hassani et al, 1980;Read et al, 1980;Gunsallus and Kulhawy, 1984;ISRM, 1985;Brook, 1985;Vallejo et al, 1989;Chargill and Shakoor, 1990;Grasso et al, 1992;Singh and Singh, 1993;Chau and Wong, 1996;Smith, 1997;Hawkins, 1998;Romana, 1999; Kahraman, 2001;Thuro and Plinninger, 2001;Tsiambaos and Sabatakakis, 2004;Kahraman et al, 2005;Fener et al, 2005). Some of them found power functions but the majority of them presented a linear relation between these two mechanical parameters.…”

Section: Point Load Strength Index (Is 50 )mentioning

confidence: 97%

Study on uniaxial compressive strength, point load strength index, dynamic and physical properties of serpentinites from Central Greece: Test results and empirical relations

Diamantis

Gartzos

Migiros

2009

Engineering Geology

175

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Section: Point Load Strength Index (Is 50 )mentioning

confidence: 97%

Study on uniaxial compressive strength, point load strength index, dynamic and physical properties of serpentinites from Central Greece: Test results and empirical relations

Diamantis

Gartzos

Migiros

2009

Engineering Geology

175

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“…The Uniaxial Compressive strength was indirectly measured using the Point load test which was developed as an index test, since the samples appeared to be very broken, at least for the UCS testing method. The Point load test is widely used to determine the uniaxial compressive strength indirectly, because of its ease of testing, simplicity of sample preparation and in some case field application ( [34][35][36][37][38][39][40][41][42][43][44][45]). A correlation factor (k) between UCS and PLT strength of 12.5 has been proposed according to Brook (1980) [46], although, the value of K is disputed by many researchers.…”

Section: Materials Studied and Testing Methodsmentioning

confidence: 99%

Geotechnical and mineralogical properties of weak rocks from Central Greece

et al. 2009

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Thirty bulk samples of hard soils-soft rocks such as marls, originating from Euboea Island and Peloponnesus area, were investigated to evaluate their geotechnical behavior. Specifically, by conducting a series of physical and geotechnical tests, such as liquid limit and plastic limit tests, along with the estimation of the grain size fraction, Slake Durability and Point Load Test. Certain parameters were determined and used for empirical correlations with their mineralogical characteristics. The mineralogical composition was determined by Xray diffraction, thermo-gravimetric and thermal analysis, succeeded by textural analysis performed by Optical Microscope. With the help of the above mentioned tests, we interpreted the observed geotechnical behavior of the examined weak rocks by means of mineralogical composition and texture. Durability and the unconfined compressive strength was found to be influenced by high percentages in carbonate minerals. In addition, it was found that a decrease in clay content resulted in higher strength and durability values. The concluded empirical correlations verified the influence of these parameters and gave a general overview of the engineering behavior of the examined weak rocks.

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“…The point load index (Is) and the point load index adjusted for samples with 50 mm (Is (50) ) were obtained from equations (1) and (2). Equations (3) and (4), proposed by Singh and Singh (1993) and Basu and Kamran (2010), were used to estimate the uniaxial compressive strength (σc) from point load test in quartzites and schists, respectively. …”

Section: Geological and Geotechnical Surveymentioning

confidence: 99%

Applicability of geomechanical classifications for estimation of strength properties in Brazilian rock masses

Santos

Lana

Santos

et al. 2017

An. Acad. Bras. Ciênc.

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Many authors have been proposed several correlation equations between geomechanical classifications and strength parameters. However, these correlation equations have been based in rock masses with different characteristics when compared to Brazilian rock masses. This paper aims to study the applicability of the geomechanical classifications to obtain strength parameters of three Brazilian rock masses. Four classification systems have been used; the Rock Mass Rating (RMR), the Rock Mass Quality (Q), the Geological Strength Index (GSI) and the Rock Mass Index (RMi). A strong rock mass and two soft rock masses with different degrees of weathering located in the cities of Ouro Preto and Mariana, Brazil; were selected for the study. Correlation equations were used to estimate the strength properties of these rock masses. However, such correlations do not always provide compatible results with the rock mass behavior. For the calibration of the strength values obtained through the use of classification systems, stability analyses of failures in these rock masses have been done. After calibration of these parameters, the applicability of the various correlation equations found in the literature have been discussed. According to the results presented in this paper, some of these equations are not suitable for the studied rock masses.

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Correlation between point load index and compressive strength for quartzite rocks

Cited by 71 publications

References 5 publications

Study on uniaxial compressive strength, point load strength index, dynamic and physical properties of serpentinites from Central Greece: Test results and empirical relations

Study on uniaxial compressive strength, point load strength index, dynamic and physical properties of serpentinites from Central Greece: Test results and empirical relations

Geotechnical and mineralogical properties of weak rocks from Central Greece

Applicability of geomechanical classifications for estimation of strength properties in Brazilian rock masses

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