Innovation plays a critical role in the mining industry as a tool to improve the efficiency of its processes, to reduce costs, but also to meet the increasing social and environmental concerns among communities and authorities. Technological progress has also been crucial to allow the exploitation of new deposits in more complex scenarios: …
The strength of rock under different stress states satisfies the following law: triaxial compressive strength>biaxial compressive strength>uniaxial compressive …
In this study, rock geomechanical properties including uniaxial compressive strength (UCS), Brazilian tensile strength (BTS), point load strength index (Is (50)), and …
The strength of rocks and soil is a crucial design parameter in engineering projects, and it can be determined through various test methods such as uniaxial …
This research proposes empirical models to estimate pillar strength by adopting multilinear regression and artificial neural network approaches for rock salt mines of the Salt Range, Punjab, Pakistan. The field data of a total of 168 pillars was collected from three (03) selected rock salt mines being operated by Pakistan Mineral …
Rock crushing machine description: Rock crushing machine is engaging in crushing various rocks and stones with comprehensive strength not higher than 320 MPa into fine and micro fine powders, is widely used in metallurgy, mining, chemical, cement, coal, sand-making, coal gangue, construction, refractory materials and ceramic industries.
Rock fragmentation efficiency can be increased by microwave heating. The mechanical properties and energy evolution characteristics of coarse sandstone specimens under different microwave heating conditions are compared in this paper. The effects of microwave heating time and power on coarse sandstone specimens of peak stress, …
Journal of The South African Institute of Mining and Metallurgy; rocscience. Save to Library Save. Create Alert Alert. Cite. Share. 174 Citations. Highly Influential Citations. 6. ... a novel biaxial loading apparatus developed for biaxial compressive and shear strength testing of rock material and rock mass specimens, is described. The ...
Rock burst has always been a major problem in deep underground engineering with high stress, and rock burst strength evaluation has become an important research topic. To effectively predict the rock burst hazard in underground rock mass engineering, a cloud model (CM) rock burst intensity evaluation method based on the …
Home Journal of the Southern African Institute of Mining and Metallurgy Vol. 64, No. 10. Open Access. Fracture of anisotropic rock . E. Hoek; E. Hoek. Search for more papers by this author . Affiliations. 1 Rock Mechanics Division, National Mechanical Engineering Research Institute ... anisotropic rock; triaxial strength tests; Griffith's ...
Investigation of rock strength will reveal the failure mechanism and bearing capacity and help establish the failure criterion, so as to provide the theoretical basis for calculating the strength of structures in rock engineering. ... (2023). Rock Mechanical Properties. In: Xu, K. (eds) The ECPH Encyclopedia of Mining and Metallurgy. Springer ...
A practical approach for estimating the strength behaviour of rock materials is presented. The demand for data on rock properties in engineering design is considered, and it is shown that, based on the trends observed in the South African mining industry during the last twenty years, simple and easy-to-use methods for the estimation of the uniaxial and …
The mechanical properties of rock, especially the uniaxial compressive strength (UCS), the elastic modulus (E), and the Brazilian tensile strength (BTS) are critically important for rock engineering.
tm is the 'tensile' strength of the rock mass. In order to use the Hoek-Brown criterion for estimating the strength and deformability of jointed rock masses, three 'properties' of the rock mass have to be estimated. These are 1. the uniaxial compressive strength s ci of …
Transactions of the Institutions of Mining and Metallurgy: Section A Volume 115, 2006 - Issue 1: Tomorrows technology in metals and minerals. Submit an article Journal ... From the point load test results, a decreasing trend is observed in terms of strength of the rock samples with microwave exposure duration. Some rock samples …
An empirical strength criterion for rocks and rock masses is proposed. The nonlinear criterion includes the uniaxial compressive strength of the intact rock material and …
The mining rock-mass rating (MAMA) classification system was introduced in 1974 as a development of the CSIA ... It is also possible to use the ratings (AMA) in the determination of empirical rock-mass strength (AMS) and then ... @ The South African Institute of Mining and Metallurgy, 1990. SA ISSN 0038-223X/3.00 + 0.00. Paper received 3rd ...
In a hard-rock mine, blasting is an important rock-breakage process that impacts energy consumption both in downstream comminution processes and mine …
It is shown that the uniaxial compressive strength of rock can be conveniently determined from the point-load strength index, which is obtained underground on unprepared rock …
Semantic Scholar extracted view of " rock temperatures and geothermal gradients in the Bushveld Complex" by M.Q.W. Jones. ... Mining, Metallurgy & Exploration. ... Expand. PDF. Save. Revisiting factors contributing to the strength of cemented backfill support system: A review. N.M. Chiloane F. Mulenga. Engineering, …
Metallurgy involves studying how metals behave and using that understanding to manipulate and shape them into various forms. ... part of the field is extracting metals from their natural sources, such as ores. An ore is a naturally occurring rock or mineral that contains a valuable material, such as metal or gemstones, which …
Transactions of the Institution of Mining and Metallurgy, Section A: Mining Technology 80(770):1-9; ... The above researchers also recommended that rock strength can be derived by point load test.
Rock engineering tasks like tunnelling, dam and building construction, and rock slope stability rely heavily on properly estimating the rock's uniaxial compressive strength (UCS), a crucial rock geomechanical characteristic. As high-quality specimen are not always possible, scientists often estimate UCS indirectly. The primary objective of …
Edited by J. Udd. (Montreal; Canadian Institute of Mining and Metallurgy). Special Volume 35, 1987, pages 1-6. Support in Hard rock Underground Mines 2 ... Shotcrete can add significant strength to rock and should be used in long-term openings (ramps etc.). Mesh and straps may be required in short-term openings (drill-drives etc.)
This paper addresses the surrounding rock control problem of deep roadways in broken soft rock. The 21914 working face haulage roadway in the Zhangshuanglou coal mine was taken as a case study. The deformation characteristics and failure mechanisms of the roadway surrounding rock were analysed via theoretical …
The rock-bolt support theory mainly includes the suspension theory (Fig. 2a), composite beam theory (Fig. 2b), combined arch (compression arch) theory (Fig. 2c), and the maximum horizontal stress theory, and strength enhancement theory of surrounding rock supported by roadway bolts, which developed later.According to the suspension theory, …
Journal of the South African Institute of Mining and Metallurgy Volume 64, Pages 501-518, No. 10, May 1964. Fracture of Anisotropic Rock 2 23 ... Most of the published research on anisotropic rock is of an experimental nature1, 2, ... Results of triaxial strength tests on a South African slate are in good agreement with the
Henri-Joseph built the first TBM in 1846 to dig the Frejus Rail tunnel between France and Italy through the Alps. In the early stages, it was only used for soft rock formations like potash and coal mines [], but the modern TBM can excavate through very hard and abrasive rock.Hard rock TBM tunnelling refers to tunnelling through a high …
Heterogeneity and discontinuity significantly affect rock strength. For accurate stability prediction, intact rock behavior is imperatively included in rock mass behavior. However, past research largely used arbitrary scaling approaches to produce rock strength. This paper considers a stochastic approach in order to determine the …
Both the coal seam and the surrounding rock are assumed to deform elastically with the following constants: Elastic modulus of coal = 2 x 10s lb/sq. in. Elastic modulus of surrounding rock = 2 x IO6 lb/sq. in. Poisson's ratio of surrounding rock = 0-2 Mining is at a depth of about 545 ft (//). In the absence of barrier pillars, the pressure . P
While the values of uniaxial compressive strength The Journal of The Southern African Institute of Mining and Metallurgy Sept_47-52:Template Journal 11/10/08 11:26 AM Page 623 Estimating the modulus of elasticity of the rock material compressive strength and unit weight values except for those of the Dolayoba formations.
The stability graph was introduced in 1981 by Mathews and co-workers in Golder Associates. This period coincided with the shift from open pit mining to underground bulk or mass mining in North ...
The rock quality designation (RQD) is a commonly used index for the classification and evaluation of rock mass quality and is widely adopted in mining and geological engineering. The traditional method of obtaining RQD still requires manual measurement of core length and calculation of RQD, which is inefficient. To address this …
The aim of this international peer-reviewed journal of the Society for Mining, Metallurgy & Exploration (SME) is to provide a broad-based forum for the exchange of real-world and theoretical knowledge from academia, government and industry that is pertinent to mining, mineral/metallurgical processing, exploration and other fields served by the Society.
where γ e is the cumulative shear strain in the elastic stage. If the surrounding rock enters the plastic stage, γ e is equal to the shear strain at the elastic limit of the surrounding rock. According to the load-bearing state, in the case of minor deformation, rock mass strain can include elastic strain and plastic strain; total strain is …