Protodyakonov Scale Of Hardness
A critical appraisal of the protodyakonov index
Int. J. Rock Mech. Min. Sci.& Geomech. Abstr. Vol. 13, pp. 249-251. Pergamon Press 1976. Printed in Great Britain Technical Note A Critical Appraisal of the Protodyakonov Index A. G. PAITHANKAR* G. B. MISRA'~ INTRODUCTION The Protodyakonov index is a simple rock character- istic which has immense possibility of …
Protodiakonov, Mikhail | Article about Protodiakonov, Mikhail …
He also developed a scale for the hardness of rocks. WORKS Davlenie gornykh porod i rudnichnoe kreplenie, parts 1–2. Moscow, 1930–33. Provetrivanie rudnikov, 5th ed. Moscow-Leningrad, 1931. Sostavlenie gornykh norm ipol'zovanie imi, 2nd ed. Moscow-Leningrad-Novosibirsk, 1932.
Pore and mechanical characteristics of high-temperature …
As the temperature rose, the uniaxial compressive strength and Protodyakonov scale of hardness remained constant basically between 100℃-400℃, increased rapidly between 400℃-700℃ and ...
Analysis of Protodyakonov's Correlation Relationships …
Protodyakonov in [20] gives the following correlation dependences for the strength characteristics of ... Acar A, Çobanoğlu I and Uras Y 2004 Correlation between Schmidt …
RI5RFNV
destruction - prof. M.M. Protodyakonov [2] proposed the coefficient of hardness f, in the first approximation, it is proportional to the rock break -down point under compressive …
meaning in English
mearning in English : protodyakonov scale of hardnes…. click for more detailed English meaning, translation, meaning, pronunciation and example sentences. ... protodyakonov scale of hardness "" in English: general; universal "" in English: family name; surname
Which Crushing Equipment Is Suitable for Your Hard …
For the ores, Protodyakonov scale and Mohs scale of mineral hardness are adopted. 1. ... The Mohs scale of mineral hardness is a standard for measuring the hardness of minerals. It adopts the ...
Indentation hardness testing of rock
Hardness is a measure of a material's resistance to localised elasto–plastic deformation. Early hardness tests were based on the properties of minerals with a scale constructed solely on the ability of one material to scratch another that was softer. A quantitative hardness indexing scheme was devised, termed the Mohs scale.
Wood Hardness Chart
Our chart is based on the Janka Hardness Scale which is the industry standard for gauging the ability of various wood species to resist denting and tolerate normal wear. It also indicates the effort required to either nail or saw the particular wood species. The woods are listed from hardest to softest, so the higher the number, the harder the ...
Journal of Mining Institute. 2021. Vol. 251. P. 639-647 …
rock development with Protodyakonov scale of hardness up to f = 2, the cutters are equipped with wedge-shaped teeth (Fig.1, a), since with greater hardness their cutting …
China Russian Type Knsh-110 Knsh-130 Low Air
Crown boring bits are designated for crushing rocks with hardness coefficient f=6...20 under Protodyakonov scale of hardness at boring wells with downhole hammers at open and underground mining works. Spline-key or bayonet connection of the crown boring bit with the downhole hammer ensures reliable fastening and quick change of tools.
Design Parameters Optimization of Cutting Head of Cantilever Roadheader
For hard rocks whose protodyakonov scale of hardness f are greater than 8, research on the optimization design of cutting head of cantilever roadheader. Optimization model of the cutting head was established, in this model, the objective function was established based on dust mount, energy consumption and production efficiency. The design …
Uniaxial compressive strength of average rock as a function …
Often in practice, the coefficients of Protodyakonov scale of hardness f are not established based on objective measurements that are very laborious, but by visual degree and rock family type ...
Drilling rig СБШ-250-32 "UNIVERSAL" — UPE "Niva"
Cone drilling rig СБШ-250-32 "Universal" is designed for drilling vertical and inclined (15˚ and 30˚ to the vertical) blast holes in open pit mining, and other drilling and blasting operations in rocks with a hardness factor of 8-18 (according to the scale of prof. Protodyakonov) in areas with a temperate climate.
RI5RFNV
destruction - prof. M.M. Protodyakonov [2] proposed the coefficient of hardness f, in the first approximation, it is proportional to the rock break -down point under compressive load. The scale of hardness was developed, according to which all rocks are divided into ten categories. Many post -Soviet engineers use this coefficient.
Correlation between hardness coefficient, specific …
Often in practice, the coefficients of Protodyakonov scale of hardness f are not established based on objective measurements that are very laborious, but by visual degree and rock family type ...
Modern Methods and Tools for Determining Drillability and …
For a quantitative assessment of the rock strength as resistance to mining - technological destruction - prof. M.M. Protodyakonov [2] proposed the coefficient of …
Study on Roadheader Cutting Load at Different Properties of …
The contact strength P k and the protodyakonov scale of hardness f have certain corresponding relations as shown in Table 1. Table 1 Corresponding relationship between P k and f .
Experimental study on mechanical and porous characteristics of
Protodyakonov scale of hardness [3] characterizes the relative value of rock resistance to failure and can be calculated through (1) f = R 10 where ƒ is the Protodyakonov scale of hardness, R is the uniaxial compressive strength of rock. According to the Protodyakonov scale of hardness, the hardness of rock is divided …
The use of Protodiakonov and Hardgrove methods to …
2.2. Methods. GOST 21153.1–75 Rocks. The strength coefficient, which determining up to Protodyakonov, uses to hard rocks (including coals) and sets a …
Basic Physical Properties and Characteristics of Coal Pores …
The coal hardness is generally characterized by the hardness coefficient of coal, which is also known as the Protodyakonov coefficient and is usually expressed with a dimensionless (f) value. The hardness coefficient of coal is defined as the relative value to characterize the resistance of solid coal to crushing, which is equivalent to 1/10 ...
Prediction of Bond's work index from field measurable rock …
A systematic investigation was carried out to predict Bond's work index using simple field measurable properties of rocks. Tests were conducted on Basalt, Slate and Granite using a laboratory scale ball mill and rock properties namely density, Protodyakonov's strength index and rebound hardness number were determined.
(PDF) Modern Methods and Tools for Determining …
Often in practice, the coefficients of Protodyakonov scale of hardness f are not established based on objective measurements that are very laborious, but by visual degree and rock family type ...
Modern Methods and Tools for Determining
Often in practice, the coefficients of Protodyakonov scale of hardness f are not established based on objective measurements that are very laborious, but by visual degree and rock family type, which naturally significantly reduces the accuracy of calculations. In this regard, it is proposed to obtain information on the physical …
Cal's Scale of Hardness – First Editon
What is the Scale of Hardness? Great question. Basically, it's a top-notch resource (used by Darren Carr, 2023 HiLux winner) which can help you see what kind of run a team/player has coming up. Could be hard… could be all green which means very easy. Sometimes it can help with trades, captains and more importantly… starting off your …
protodyakonov impact stength index in Chinese
protodyakonov impact stength index in Chinese : …. click for more detailed Chinese translation, meaning, pronunciation and example sentences.
Determination of rock strength from slake durability tests
Determination of rock strength from slake durability tests, Protodyakonov impact tests and Los Angeles abrasion resistance Embed Size (px) 344 x 292 429 x 357 514 x 422 599 x 487
Relationship between minimum specific drilling energy and …
Often in practice, the coefficients of Protodyakonov scale of hardness f are not established based on objective measurements that are very laborious, but by visual degree and rock family type ...
A review of mining-induced seismicity in China
Another exception is identified at Quantai coalmine in Xuzhou, Jiangsu Province. The uniaxial compressive strength of coal at the mine site is 10 MPa, and the Protodyakonov scale of hardness f is 1. According to Eq. (1), the critical initiation depth would be about 300 m but the actual value is 590 m, almost twice the predicted value.
Research on the mathematical modeling Protodyakonov …
On this basis, a function model between the hydraulic cylinder pressure and the protodyakonov scale of rock hardness is constructed to identify the rock hardness. The average recognition accuracy ...
The use of Protodiakonov and Hardgrove methods to …
2.2. Methods. GOST 21153.1–75 Rocks. The strength coefficient, which determining up to Protodyakonov, uses to hard rocks (including coals) and sets a method for determining the coefficient of its strength for categorizing it in technical documentation, in the calculations and project of modern mining operations, mining tools and equipment, …
determination of rock strength from slake durability tests
Determination of rock strength from slake durability tests, Protodyakonov impact tests and Los Angeles abrasion resistance