International Journal of Rock Mechanics and Mining Sciences

(1975) Investigation of the stresses in the rock mass on the equivalent-material models. Part 1. A long mine opening with circular section without support. In Czech. 9F, 1T, …

Glossary of Mining Terms

Anticline - An upward fold or arch of rock strata. Aquifer - A water-bearing bed of porous rock, often sandstone. Arching - Fracture processes around a mine opening, leading to stabilization …

Stresses In Mine Drift Timber Sets [PDF] [sjnh7ij4tsk0]

Stresses In Mine Drift Timber Sets [PDF] [sjnh7ij4tsk0]. ... stsesses xi m m mirt n m m stmoa p. n s x m m u JJ BRAKY COLORADO SCHOOL OF H I H H GOLDEN,COLORADO

Rock Stress Considerations in Underground Mines

Abstract. In situ rock stresses are directly associated with the stability of underground openings and thus the state of in situ rock stress is a crucial factor for the design …

Statistical analysis of underground stress measurements in …

maximum lateral stresses and their directions in NSW and Queensland coalfields. These findings can provide a valuable benchmark for mine planning and strata control with potential savings …

Mine planning: From strategy to operation to optimization

The first of these levers, including Mining Method Selection, Process Route Selection and Scale of Operation levers are discussed in Mine Planning 1 – Strategy.

In situ stresses in mining areas in South Africa

The sites were situated in both igneous and sedimentary rocks ranging in age from 3 000 to 250 m.y. and cover a depth range from 20 to 2 500 m.At shallow depths, horizontal stresses tend to be ...

Coal Miner Jargon

Longwall Mining 1. A system of mining coal that allows the mine face to be worked all at the same time, usually with large mining machines. The entire seam is mined, and no pillars are left in place. 2. Mining of or involving a single long …

RU2834170C1

FIELD: measuring. SUBSTANCE: invention relates to surveys of geotechnological objects in the field of geomechanics. This invention can be used for rapid determination of stresses on walls …

AIC 2019

AIC 2019 - ePOSTERS

Stresses in mine drift timber sets

Discover Mines Repository. Links. About the Mines Repository; Arthur Lakes Library; Colorado School of Mines; ... Home. Theses & Dissertations. 1940-1949 - Mines Theses & Dissertations. …

Monitoring Stress State Near Major Geological Structures in an

Stress state and geotechnical conditions often change significantly near major geological structures (e.g. faults, shear zones, dykes) in underground coal mines which is the …

ZA815343B

stresses magnitude determining mine supports mine Prior art date Application number ZA815343A Other languages English (en) Inventor Hans Dieter Klein Joachim Leonhardt …

Dynamic stress characterization and instability risk …

Results show that anomalous zones in wave velocities and b -values form at the intersections of extraction drifts, strike drifts, cross drifts, …

International Journal of Rock Mechanics and Mining Sciences

In situ rock stress measurements in French coal mines: relation between stresses and rock bursts: Journal: International Journal of Rock Mechanics and Mining Sciences & …

STRESSES IN MINE DRIFT TIMBER SETS

kinds of mines over a very extended period of time. Underground forces in mines can be repelled in two ways, either by pillars or artificial support for which timber is the most widely used. …

Measurement And The Distribution Law Of In Situ Stresses At …

Many kinds of in situ stress measurement methods are used nowadays, two most common of which are the overcoring and the hydraulic fracturing methods. In order to study the …

Machine learning approach for the prediction of mining-induced …

Measurement of mining-induced stress is one of the most important parameters for strata control (Allanson 2002). Vibrating wire stress cells as shown in Fig. 15 are installed into …

Determination of mining-induced stresses using diametral rock …

Knowledge of ground stresses is crucial for ground control activities such as the design of underground openings, selection of support systems, and analysis for stability. …

In Situ Stress at the Lucky Friday Mine (In Four Parts)

in situ stress characteristics at the Lucky Friday Mine, Mullan, ID. An analysis of these data revealed that significant local variations in in situ stress are present in this mine and that these …

OneTunnel | Regional in-situ stresses in mine design

High horizontal stresses and high horizontal to vertical in-situ principal stress ratios in the plane of underground drifts and entries can damage weakly laminated roof rocks quite severely. Such …

concentrated lithostatic stresses around mine excavations are violently released. Other components of the in situ stress field, such as tectonic and residual stresses, have also been …

Identifying and Preventing Fire Hazards in Mines

Mining operations are subject to a variety of legal and regulatory standards concerning fire safety. Regulatory bodies such as the Mine Safety and Health Administration (MSHA) in the United States and the International …

Heat Stress in Underground Mines and its Control Measures: A

Heat stress is a major concern for the health, safety and productivity of miners working in hot and humid underground mines. At greater depth, heat inside underground …

Geophysical Methods to Detect Stress in Underground Mines

the use of seismic tomography to map stress in an underground mine by comparing pressure changes (induced pressure) in a pillar to velocity changes in settings where geologic features, …

Mine Design Relating to Mining Direction

Mine Design Relating to Mining Direction. This relates mainly to horizontal stress fields. Stress fields are seldom equal in all directions and in a horizontal plane it is usual for there to be a …

Rock dynamics in deep mining

The world's first recorded mining dynamic disaster occurred in the Witwatersrand Gold Mine of South Africa in the early 20th century [5].Between 1983 and 2013, there were …

Application of indirect stress measurement techniques (non …

gold mines (Stacey, 1998), the following requirements were considered to be desirable for a routine method of in situ stress measurement in the mining industry: • the technique must be …

OneMine | The Stresses In The Mine Roof

THE stresses in the e simplest structures are often those we find most difficult to analyze. The most complex condition in mine stresses is found in simple tunnels where the roof, the sides, …

WHY HORIZONTAL STRESS AND STRAIN IN …

An understanding of the three-dimensional state of stress within the earth's crust (in situ stress) is fundamental in the engineering disciplines of mining, petroleum and civil engineering. The …

Study on In Situ Stress Distribution Law of the Deep Mine: Taking …

In this study, the deep mines of Linyi Mining Area were considered as the research object. In this regard, the stress distribution law of each mine was studied. We found that the …

Variation of Horizontal Stresses and Strains in Mines in Bedded

In general, the direction of the maximum horizontal stress in the eastern United States is fairly well defined. However, the variation of the magnitudes of the horizontal stresses is not very well …

Coping With High Lateral Stresses In An Underground Illinois Coal Mine

The purpose of this paper is to discuss production and roof control problems associated with directional lateral stresses in an in situ stress field and the approach that Inland Steel Coal …

Variation of Horizontal Stresses and Strains in Mines in Bedded

In general, the direction of the maximum horizontal stress in the eastern United States is fairly well defined. However, the variation of the magnitudes of the horizontal stresses …

30

30 - news.gov..ca

OneMine | Regional in-situ stresses in mine design

High horizontal stresses and high horizontal to vertical in-situ principal stress ratios in the plane of underground drifts and entries can damage weakly laminated roof rocks quite severely. Such …

Rock mass properties for underground mines

1 and s'3 are the maximum and minimum effective stresses at failure, m b is the value of the Hoek-Brown constant m for the rock mass, s and a are constants which depend upon the rock …

SUPPORT IN UNDERGROUND HARD ROCK MINES

Support in Hard rock Underground Mines 4 Table 1: Suggested support for various rock conditions. Rock Conditions Suggested support type Sound rock with smooth walls created by …