Study on the Measurement of Rebound Number of Rocks by the Schmidt Test Hammer

Inoue, Masayasu; Matsumura, Hideo; Omi, Michito

doi:10.2473/shigentosozai1953.84.964_1066

Cited by 2 publications

(2 citation statements)

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“…Several researchers have attempted to estimate the strength of concrete and rock through a Schmidt hammer experiment (Inoue and Omi 1970;Sheorey et al 1984;Haramy and DeMarco 1985;Sachpazis 1990;Kahraman 2001;Karaman andKesimal 2015, Teymen 2021, etc.). The Schmidt hammer can be used in both laboratory and field investigations.…”

Section: Schmidt Hammer Experimentsmentioning

confidence: 99%

Performance prediction of roadheaders used in coal mines from the needle penetration index and the schmidt hammer value

Rostami,

Kahraman,

Dibavar

et al. 2024

Geomech. Geophys. Geo-energ. Geo-resour.

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Coal mine galleries and construction tunnels are commonly excavated using roadheaders. Estimating the performance of roadheaders is crucial for planning and cost estimation when planning tunnel or tunnel projects. The aim of this study is to derive generalized performance prediction models including Schmidt hammer value, needle penetration index, and volumetric joint count for roadheaders used in coal mines. The performance measurements of axial and transverse type roadheaders were carried out in six different coal mines. Schmidt hammer tests, needle penetration index tests, and of volumetric joint count measurements were also performed at the locations where the performance measurements were conducted. The extensive data were evaluated using multiple linear and nonlinear regression analysis. The developed formulas were evaluated using statistical tests. The Equations that include the Schmidt hammer value or needle penetration index value in addition to cutter head power have been shown to be unreliable. However, the equations that include Schmidt hammer value or needle penetration index value in addition to cutterhead power and volumetric joint count have been shown to be reliable. This study concludes that the developed reliable equations can be used for the performance assessment of roadheaders used in coal mines.

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Section: Schmidt Hammer Experimentsmentioning

confidence: 99%

Performance prediction of roadheaders used in coal mines from the needle penetration index and the schmidt hammer value

Rostami,

Kahraman,

Dibavar

et al. 2024

Geomech. Geophys. Geo-energ. Geo-resour.

View full text Add to dashboard Cite

show abstract

“…The most widely used geomechanical rock property in defining the rock strength and excavation performance is uniaxial compressive strength (UCS) (Deere and Miller, 1966;Inoue and Omi, 1970;Aufmuth, 1973;Carter and Sneddon, 1977;Kidibinsky, 1984;Shorey et al, 1984;Haramy and De Marco, 1985;Ghose and Chakraborti, 1986;Sachapazis, 1990;Xu et al, 1990;Cargil and Shakoor, 1990;Katz et al, 2000). However, determining the UCS value requires time-consuming, expensive and sometimes restricted sampling.…”

Section: Introductionmentioning

confidence: 97%