The use of point load test for Dubai weak calcareous sandstones

Elhakim, Amr F.

doi:10.1016/j.jrmge.2015.06.003

Cited by 41 publications

(20 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Many researchers have proposed a number of the correlations based on the tests they performed on different rock types. Some of them are Broch & Franklin (1972); Bieniawski (1975); Akram & Bakar (2007); Kim, Kim, Kang, Kang, & Baek (2012); Salah, Omar, & Shanableh (2014); Elhakim (2015). However, estimation of the UCS using these correlations for different rock types could lead to large variability and errors.…”

Section: Figure 1 Some Rock Samples After Point Load Index Testsmentioning

confidence: 99%

See 1 more Smart Citation

Effects of elevated temperature on physical and mechanical properties of carbonate rocks in South-Southern Nigeria

Idris¹

2018

Min. miner. depos.

View full text Add to dashboard Cite

Purpose. Limestone and marble are carbonate rocks with several structural and engineering applications. The physical and mechanical properties of the rocks are fundamental as they determine their suitability for various use. Temperature is one of the critical factors that could affect the properties of the rocks and consequently their engineering application. Therefore, a better understanding of how the temperature, especially when it is higher than ambient, will affect the properties of the rocks is essential. In this work, the effects of the elevated temperature on some physical and mechanical properties of the carbonate rocks have been studied.Methods. Cubic samples of the rocks were prepared and heated in a furnace to different temperatures up to 900°C at an interval of 100°C and then cooled to the room temperature for testing. Porosity, dry density and uniaxial compressive strength (UCS) of the samples were determined under the effect of the elevated temperature. The porosity and dry density were determined using the saturation and buoyancy method while the UCS was estimated from the point load index tests performed on the samples.Findings. The results of this work indicate that the elevated temperature has significant effects on the physical and mechanical properties of the rocks. The porosity of the rocks showed an increasing trend as the temperature was increased while the density steadily decreased especially at the temperature above 300°C. The UCS of the rocks also declines with increased temperature but with an intermittent increase in their strength at a specific heating temperature.Originality. Most of the available studies on Nigerian carbonate rocks are focused on the estimation of physical and mechanical properties of the rocks without considering changes in these properties when the rocks are subjected to high temperatures. This study therefore aims to fill the gap by investigating the effects of the elevated temperatures on the physical and mechanical properties of some of the Nigerian carbonate rocks. Practical implications.The results of this study further increase understanding of the effect of high temperature on carbonate rocks, and also help to identify the critical temperature at which the properties of carbonate rocks undergo significant and irreversible changes. This information is very important for restoration of valuable fire-damaged structures made of carbonate rocks.

show abstract

Section: Figure 1 Some Rock Samples After Point Load Index Testsmentioning

confidence: 99%

“…However, estimation of the UCS using these correlations for different rock types could lead to large variability and errors. Therefore, it is highly recommended to develop UCS -I s(50) correlations to be used for any specific rock type and local geologies (Elhakim, 2015).…”

Section: Figure 1 Some Rock Samples After Point Load Index Testsmentioning

confidence: 99%

Effects of elevated temperature on physical and mechanical properties of carbonate rocks in South-Southern Nigeria

Idris¹

2018

Min. miner. depos.

View full text Add to dashboard Cite

show abstract

“…However, strength and deformation is controlled by inherent physical properties of the material such as mineral composition, density, structure, fabric and porosity. Therefor a 1 m selection buffer was enforced on laboratory results against petrographic (Abbs 1985;Elhakim 2015) analysis sample depths; where this criterion could not be satisfied the nearest laboratory results were selected and assumed as being representative. Laboratory results that satisfied these criteria are shown in Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…To assess if the selected laboratory results were representative of the Ghayathi Formation sandstone: the UCS and correlated PLI were compared against all the laboratory results for the eight boreholes. Figure 2 shows this comparison: triangles represent selected representative petrographic lab results against UCS results, which are represented by hatches and correlated point load index using a determined correlation factor of UCS = 4.5829 Â I 50 , which is in general agreement with Abbs (1985) and Elhakim (2015), are represented by circles.…”

Section: Resultsmentioning

confidence: 99%

Latest Advancements in Underground Structures and Geological Engineering

Bezuijen¹,

Wittke²,

Poulos³

et al. 2020

Sustainable Civil Infrastructures

View full text Add to dashboard Cite

show abstract

“…Failure load, rock size, rock shape, and loading mode are used to calculate the point load strength index (PLSI or Is (50) ) [3,4]. e PLSI is an important strength parameter index for the classification of rock strength [4][5][6][7], determination of UCS [1][2][3][4][8][9][10][11][12][13][14], and estimation of strength anisotropy [4,11,[15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Point Load Test of Half‐Cylinder Core Using the Numerical Model and Laboratory Tests: Size Suggestion and Correlation with Cylinder Core

Ren

Liu

et al. 2018

Advances in Civil Engineering

View full text Add to dashboard Cite

The point load test (PLT) is intended as an index test for rock strength classification or estimations of other strength parameters because it is economical and simple to conduct in the laboratory and in field tests. In the literature, calculation procedures for cylinder cores, blocks, or irregular lumps can be found, but no study has researched such procedures for half-cylinder cores. This paper presents the numerical model and laboratory tests for half-cylinder and cylinder specimens. The results for half-cylinder and cylinder specimens are then presented, analysed, and discussed. A correlation of failure load between half-cylinder and cylinder specimens is established with a suitable size suggestion and correction factor. It is found that the failure load becomes stable when half-cylinder specimens have a length/diameter ratio higher than 0.9. In addition, the results show that the point load strength index (PLSI) of half-cylinder cores can be calculated using the calculation procedures for diametral testing on cylinder cores, and it is necessary to satisfy the conditions that the length/diameter ratio be higher than 0.9 and the failure load be multiplied by 0.8.

show abstract

The use of point load test for Dubai weak calcareous sandstones

Cited by 41 publications

References 13 publications

Effects of elevated temperature on physical and mechanical properties of carbonate rocks in South-Southern Nigeria

Effects of elevated temperature on physical and mechanical properties of carbonate rocks in South-Southern Nigeria

Latest Advancements in Underground Structures and Geological Engineering

Point Load Test of Half‐Cylinder Core Using the Numerical Model and Laboratory Tests: Size Suggestion and Correlation with Cylinder Core

Contact Info

Product

Resources

About