We investigate the influence of the mining stope (underground excavation or void) on seismic inversions for the scalar moment, corner frequency, source radius, stress drop …

Buildings is an international peer-reviewed open access monthly journal published by MDPI. Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge …

This paper presents a numerical investigation on the influence of the mining environment on seismic sources, with a focus on pillar failure mechanisms in tabular mining. ... The crushing source was implemented in the models at the centre pillar location as a stress drop of 10 MPa normal to the stope plane.

Comminution, an energy-intensive process, usually begins with blasting of rock in the mining operation followed by crushing in large, heavy machines, often used in stages and in combination with screens to minimize production of particles too fine for subsequent treatment (Sidebar 3-3). Grinding is usually done in tumbling mills, wet or dry ...

ABSTRACT With the increasing mining depth of coal mines, geologic hazards have become the main source of accidents. For this reason, coal seam prediction requires more assessment parameters, such as the degree of anisotropy, value, and elastic modulus. These parameters are difficult to determine using only the PP-wave. We have inverted …

Abstract. The Kaapvaal Craton in South Africa hosts one of the largest gold placer deposits in the world. Mining in the Witwatersrand Basin here has been the …

Mining-induced seismicity has been reported almost in every mining country. Large seismic events with high-energy (HE) radiation can pose a serious threat to safe mining operations, which are the direct cause for rockbursts in underground mines. Over the last 30 years, statistical techniques to parameterise seismic data and predict …

stock and provide spare parts close to the mining operation. Good geotechnical information is essential to crushing plant siting and design. Installing a primary crushing plant on solid rock reduces the cost of concrete and structural steel. Life of Mine/Expansion Plans The life of the mine is a key element in the design of any crushing plant.

This wave-excavation interaction results in complex waveforms being measured by the in-mine seismic system – the complexity being a post source effect of the wave path. These effects are widely discussed in literature (4-10). The mining environment, however, also allows for more freedom of movement with complex sources ensuing (8, 11-16), and ...

The second is "unstable crushing" failure in the rockmass surrounding a mining void. The low-frequency radiation of these so-called crush-type sources, which …

office buildings sell for more than $200 per square foot. If an owner wants to construct a 40 story building on a site with a 100 ft. long side adjacent to another building, and a 4 ft. wide building separation (seismic joint) is needed, the lost square footage would be worth $200x100x40x4=$3,200,000. Seismic Joint Between Adjacent Buildings

Most mining-induced seismic activities happen at coalmines in China. The average mining depth in 1980 was about 288 m in coalmines. In 2000, it had increased to 500 m, an increase of 212 m in 20 years. Therefore, recent increase of mine seismicity is largely attributed to the increase of mining depth. By 2003, 83% and 76% of coals had …

Highlights Energy budget for grain crushing at seismic slip rates was determined experimentally. Energy used in the grain crushing was directly measured by BET surface area of gouge. Grain crushing absorbed only 0.02∼0.22% of frictional work. Surface area of gouge decreases at large displacements due to sintering of gouge. Thus …

A normal composite wall panel is a structural component composed of polystyrene insulation boards and concrete surface layers reinforced with steel wire mesh. It can be entirely prefabricated in a factory or constructed with the concrete surface layers cast on-site. A novel prefabricated monolithic concrete–polystyrene panel composite …

1. Introduction. In intact rock mass, the rock strata remain in natural stable mechanical equilibrium conditions [ 1, 2, 3 ]. Underground mining operations will disturb …

For example, the Pakistan building code (PBC) does not address infills, despite being a common construction technique in the country. Past earthquake survey records show that construction materials and infill types significantly affect the seismic response of buildings, thus highlighting the importance of investigating such parameters.

The present review of seismicity induced by mining is a continuation of the previous reviews, published in 1990 and 2001 in Advances in Geophysics, describing the problems involved and the state-of-the-art of relevant research in this field at the end of 1980s and 1990s.During the last decade, seismic monitoring has been expanded in …

Here we conduct detailed field and microanalytical investigations on the fault core of the Geumwang Fault. Results showed that some of the gouges are primary gouges in which seismic slip was localized as the principal slip zones (PSZs), whereas others are secondary gouges that formed by the injection of fluidized gouge material into fractures.

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In more than 35% of buildings, at least one joint experienced hairline cracks, and in more than 25% of buildings, at least one joint suffered from the diagonal crack or concrete cover crushing. The lack of transverse reinforcement, poor detailing, and inadequate shear capacity were the main reasons for damage to beam-column joints.

Coarse crushing includes crushing operations discharging at sizes 4- to 6-in. or coarser; intermediate crushing comprises operations taking feeds 6- or 8-in. maximum and making products down to -1/2″ or 3/8″. Fine crushing is reduction by crushing to 1/4″ or finer; the distinctions are not sharp.

At the same time, the large chamber blasting started to be adopted in the capital construction of mine in China, with a blasting charge of 10,000 tons at one time. In 1956, 9314.7 tons of explosives were used in one production blasting at Baiyinchang Open-pit Copper Mine in Gansu, which was the largest blasting in the mining industry at that …

We present a new approach of extracting mining induced micro-seismic events from a numerical model by converting simulated plastic strain to seismic …

Blasting technology not only determines the safety, quality, and cost of mining, but also has a significant impact on the subsequent bucket loading, transportation, crushing, and other processes as well as production efficiency [4]. Since blasting technology is widely used in various mining processes, research experts have been …

The progression of the observed damage state was similar for all tested specimens: concrete cracking, cover crushing, concrete spalling, core crushing, and longitudinal reinforcement buckling. The bolted CBJs exhibited a similar or better level of seismic performance except for displacement ductility than their monolithic counterpart.

We investigate the influence of the mining stope (underground excavation or void) on seismic inversions for the scalar moment, corner frequency, source radius, …

A. M. Pucho, "The seismic action of large-scale blasts on mine workings," Gornyi Zh., No. 11 (1956). L. V. Safonov, "Methods of reducing the seismic action of blasts on mine working", in: Investigations on the Geology, Mining, and Beneficiation of Ores from the Kursk Magnetic Anomaly [in Russian], Gosgortekhizdat, Moscow (1962).

Single storey, two-storey and three-storey CM buildings were analyzed in order to speculate their seismic behaviour. Seismic zone factor was computed from the obtained lateral load as per IS 1893:2016[25]. Consequently, recommendations have been made for storey limitation in different seismic zones for the proposed CM building. 4.1.

Coal mining in thick-hard roof areas leads to frequent high-energy seismicity and may even induce coal–rock dynamic disasters such as rockburst. It is important to explore the focal mechanism of mining-induced seismicity to understand the failure behaviour of the coal–rock mass and the characteristics of the stress field. It is …