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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-mechanical properties of rocks directly from rigs during …
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 variables contain cutting head …
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 ...
Research on the mathematical modeling Protodyakonov coefficient of coal and rock hardness based on shearer motors working parameters . Yang Jian-jian, Li Xu, Zhou Jianfeng, Jiang Hai, WU Miao . School of Mechanical, Electrical & Information Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Protodyakonov scale of hardness. Another scale of hardness is called the Protodyakonov scale (Jun et al. 2003), which has been less used by researchers in rock engineering than the other methods mentioned.
It is clear that the hardness coefficient of M. M. Protod'yakonov (senior) has withstood the test of time and proved its urability.
For a quantitative assessment of the rock strength as resistance to mining - technological destruction - prof. M.M. Protodyakonov [2] proposed the coefficient of hardness f, in the first...
The Protodyakonov index is stated as being a simple rock characteristic which has the possibility of practical application, particularly in predicting rock drillability in percussive drilling. However, the accuracy of the index as determined by the standard procedure is considered to be susceptible to certain defects, and in this note the ...
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, besides, in …
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.
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 ...
For the hard rock, it adopts Mohs hardness scale and Protodyakonov scale. 1. Mohs hardness scale. Mohs hardness scale is a standard for measuring rock hardness. It uses a diamond drill to scratch the surface of tested rocks. The depth of …
according to the scale of Professor M.M. Protodyakonov as revealed by the authors of the method is as follows [8]: 4,5 0,29 0,35 0,16 0,003 2 0,006 2 0,04 2 16 2 W = + f − d as − d as f + f d as − fd as + f + d as, (2) where W is energy intensity of rock destruction of J/cm3; f is coefficient of strength according to the scale of M.M ...
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 …
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 practical appli- cation, particularly in …
The determination of index properties of rock, such as Cerchar Abrasivity Index, Shore Hardness, Protodyakonov Index and Vickers Hardness in laboratory or insitu conditions is time-consuming and requires special equipment and expertise. However, the use of P-wave technology to measure the P-wave velocity of rock is a relatively simple task ...
Baron, Hardness Coefficients of Rocks, by disclosing the logical meaning of the hardness co- efficient, reminds many of the new generation of specialists that the seven methods of hardness determination sug- gested by Protod'yakonov are noneotherthan the first correlation between the norms of elementary production proc- ...
In this method Protodyakonov's apparatus (Figs. 4 and 5) was used. ... carried out study on laboratory scale and found that during drilling of rock blocks with a pneumatic drill, the sound level ...
In this study, P-wave velocity, Cerchar Hardness, Shore Hardness, Protodyakonov Index and Vickers Hardness for all rock types were determined in the laboratory. The test results were interpreted statistically and good linear relationships were found with P-wave velocity to Cerchar Hardness, Shore Hardness, Protodyakonov Index and Vickers Hardness.
moh's scale of hardness 21 density of rocks 23 permeability of rocks 25 susceptibility of rocks 26 electrical conductivity of rocks 27 gamble's table 31 ... protodyakonov test table for sandstone samples 41 los angeles test table for sandstone sample 42 . 8 list of figures titles page number
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 ...
When f is less than 0.5, the coal properties indicate a risk of a coal and gas outburst. When f is less than 0.3, this coal is considered to be strong outburst risk (Wang C et al., 2020). ...
Semantic Scholar extracted view of "A Critical Analysis Of The Stamp Mill Method Of Determining Protodyakonov Rock Strength And The Development Of A Method Of Determining A Rock Impact Hardness Number" by N. Brook et al. ... This research work studied the influence of texture on the mechanical properties of crystalline rocks at the scale of the ...
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 of the heavy-duty roadheader in the test is 92.01%. The experimental results indicate that the model can effectively identify the rock hardness under ...
Protodyakonov in [20] gives the following correlation dependences for the strength characteristics of ... Acar A, Çobanoğlu I and Uras Y 2004 Correlation between Schmidt hardness, uniaxial compressive strength and Young's modulus for andesites, basalts and tuffs Bulletin of
The 20-point hardness scale of Protod'yakonov is a relative index, approximately characterizing the relative breaking strength of rocks during mining, and the Oc/100 ratio, which it expresses, reflects the mean uniaxial com- pressive strength for a …
The first are considered reliable and time consuming, the second - less time consuming and less reliable. The definition of the correlation dependences between the indices of strength properties was carried out by researchers all over the world, in particular, by outstanding Russian mining scientist Protodyakonov M. M.
Analysis of the correlation dependencies of Protodyakonov Protodyakonov in [20] gives the following correlation dependences for the strength characteristics of igneous, metamorphic, …
For a quantitative assessment of the rock strength as resistance to mining - technological destruction - prof. M.M. Protodyakonov [2] proposed the coefficient of hardness …
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 ...
