Using the Schmidt Hammer on Rock Mass Characteristic in Sedimentary Rock at Tutupan Coal Mine

Saptono, Singgih; Kramadibrata, S.; Sulistianto, Budi

doi:10.1016/j.proeps.2013.01.051

Cited by 28 publications

(20 citation statements)

References 15 publications

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“…The statistical results of R L for the materials tested also show that the mean R L values follow the same descending order as observed for the median values. Finally, it is also indicated that the values obtained in this study are well within the range of values reported in other studies for quartz and quartzite [54], marble [55] and metasandstone [56]. …”

Section: Schmidt Rebound Valuessupporting

confidence: 90%

Correlation between Material Properties and Breakage Rate Parameters Determined from Grinding Tests

Petrakis

Komnitsas

2018

Applied Sciences

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Abstract:The present study investigates four materials, namely quartz, marble, quartzite and metasandstone and aims to establish correlations, with the use of simple and multiple regression analysis, between their properties and breakage rate parameters. The material properties considered in this study derived from the application of destructive and non-destructive tests and include P-wave velocity (V p ), Schmidt rebound value (R L ), uniaxial compressive strength (UCS) and tangent modulus of elasticity (E t ), while the breakage rate parameters determined from batch grinding tests, include breakage rate S i , maximum breakage rate S m , α T and α, and optimum particle size x m . The results indicate that the properties of all materials examined show very good correlation and can be used to predict S i or α T . Furthermore, parameter α is well correlated with V p , R L and E t using inverse exponential functions, while S m is strongly correlated with R L and UCS. Overall, it is deduced that multiple regression analysis involving two independent variables is a reliable approach and can be used to identify correlations between properties and breakage rate parameters for quartz, quartzite and metasandstone, which are silica rich materials. The only exception shown is the determination of x m for marble.

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Section: Schmidt Rebound Valuessupporting

confidence: 90%

Correlation between Material Properties and Breakage Rate Parameters Determined from Grinding Tests

Petrakis

Komnitsas

2018

Applied Sciences

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“…Such ambiguous surfaces were avoided in the present context. The measurements were made under dry conditions, away from any water seepages or drainage systems (Matthews et al, 2016;Saptono et al, 2013). These measurement points represent unweathered outcrops from various localities, over an area of 457 km 2 (Fig.…”

Section: R-value Measurementsmentioning

confidence: 99%

“…in natural setting which, on the contrary influence the vulnerability (Obert and Duvall, 1967;Sardana et al, 2019). To evaluate UCS, both in-situ and laboratory tests were performed to obtain and establish the strength values and their correlation between in-field and laboratory data (Saptono et al, 2013;Matthews et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Macro-mechnical charakteristics and their control on the strenght of sandstones of western Indo-Burmese Rangers, NE India

Rakshit¹

2021

Acta Geodynamica Et Geomaterialia

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Mechanically strong sandstones consider as a potential construction material which can withstand modest load and not associated with any geologic fractures. This work is about understanding the macro-mechanical properties of sandstones by studying several petrographic parameters, which could provide evidence of their influence on mechanical strength. Here the authors were considered the Bhuban sandstones of western Indo-Burmese Ranges (IBR) of north-eastern India to investigate the above criteria. The result shows that sandstones have a mean grain size between 108 to 208 μm. Moderate to poorly sorted (phi scale ranges 0.56-1.5) grains show greater content of rounded constituents (43-68 %) with sphericity between 0.65-0.85; along with moderate packing properties (packing density 54-77 %; packing proximity 32-70 %). The grains join by mostly straight (20-54 %) and concavo-convex (13-45 %) contacts; with lesser point (5-13 %) and sutured contacts (8-44 %). Schmidt Hammer rebound values (R-values) were used to calculate and analyse the uniaxial confined stress (UCS); which again validated with UCS testing of core samples. The comparison between macro-mechanical parameters and the UCS shows interrelationship among rock constituents which hold the key to the mechanical strength of the rock. The presence of angular grains and semi-angular spherical grains diminish the macromechanical strength to some extent. Moreover, FETEM-EDX analysis confirms the microweathering of the angular grains, which have a deformed lattice setting. These findings show that macro-mechanical and micro-nano scale properties of sandstones influence the rock strength.

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“…During the application of the technique, certain precautions, however, need to be taken; for example, tested stone should be apparently elastic and should not disintegrate under the impact of the hammer and measurements should be carried out on smooth surfaces [ 22 ]. Paying attention to these issues, researchers have reported satisfactory correlations between Schmidt hammer rebound number and physical properties of stones [ 23 ]. In this study, a device with impact energy of 2.207 Nm was used.…”

Section: Determination Of the Mechanical Properties Of Tomb Materimentioning

confidence: 99%

Value and Vulnerability Assessment of a Historic Tomb for Conservation

Erkal

Ozhan

2014

The Scientific World Journal

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Monumental tombs reflect various social, cultural, architectural, religious, economic, and engineering features of a community. However, environmental weathering, natural disasters, poor maintenance, vandalism, and misuse unfortunately pose serious threats to these cultural assets. Historic monuments are often exposed to the highest risk due to their vulnerability. The Ottoman-style Nişancı Hamza Paşa tomb located in Karacaahmet Cemetery, Istanbul, the largest and oldest public cemetery in Turkey, is a case in point. The tomb consisting of six granite columns and a brick dome supported by six arches was constructed in 1605. Cracks, material loss, and decay as a result of adverse environmental effects and past earthquakes are evident. Therefore, this paper analyses the overall value of the tomb with respect to its historical, communal, evidential, and aesthetic aspects. Using the finite element approach and data on the tomb's material properties, a structural analysis under the self-weight and a time history analysis based on the earthquake ground motion data recorded in Duzce, Turkey, in November 1999 were conducted to encourage the conservation of this tomb and similar cultural heritage assets all over the world. The damage observed in the structure is congruent with the analysis results.

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Using the Schmidt Hammer on Rock Mass Characteristic in Sedimentary Rock at Tutupan Coal Mine

Cited by 28 publications

References 15 publications

Correlation between Material Properties and Breakage Rate Parameters Determined from Grinding Tests

Correlation between Material Properties and Breakage Rate Parameters Determined from Grinding Tests

Macro-mechnical charakteristics and their control on the strenght of sandstones of western Indo-Burmese Rangers, NE India

Value and Vulnerability Assessment of a Historic Tomb for Conservation

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