steep seam coal mining in spain

The main mining coal seam is the 6th seam and its average thickness is 3.69 m. The average angle of the coal seam is 50°C, which belongs to the high angle steep coal seam. There are two main effect factors of mining the coal seam, one is the Lei river, the other is the F 3 fault near the coal seam. The Lei river is the branch of …

The overlying coal resources in the open-pit mine of extremely thick coal seam are generally recovered by means of steep end-slope mining. In addition, infill …

mining of thick coal seam: Risk of overriding of pillars leading to premature collapse. Difficulty in strata control and its monitoring. Low percentage extraction, usually <50% when extraction is ...

It is estimated conservatively that some 14 billion tonnes of coal reserves in the United States exist in beds considered steeply dipping, i.e. at pitches or slopes in excess of 15O - a slope too steep for practical use of mobile wheel or crawler drive mining equipment. Past attempts to mine these steep reserves are limited owing to production difficulties and …

RPM MinePlanner is the next generation of mine planning software built on 40+ years of experience to deliver the most advanced solution available. MinePlanner is script-free and made up of pre-defined logic that automates tedious processes and puts the intelligence back into the scheduling engine. MinePlanner automatically determines what ...

Subsidence induced by workings in very steep seams. Table 1. Relationship between mathematical formula and actual workings parameters. Table 2 summarises …

3311 Evaluation of Surface Subsidence Due to Inclined Coal Seam Mining. movement of the overlying strata was evident, and. its asymmetrical characteristics became relatively. stable when the ...

Wang et al. 15 proposed a gray Markov prediction model on the basis of the gray system theory and Markov chain theory to predict the gas emission quantity in mines and verified the model using the ...

Ultra-thick steep coal seam mining will inevitably lead to the increase of greater and violent ground subsidence and deformation. A subsidence control method by inversely-inclined slicing and upward mining is proposed in this paper. By this method, the sequence of collapse of overlying strata and the direction of propagation of strata …

1. Introduction. Thin coal seams are fairly pervasive in coal measures. For example, in China, the coal reserve of thin coal seams accounts for approximately 20% of total coal resource and its distribution covers over 85% of mining areas of China [1], [2].In order to maximise the recovery rate, the extraction of thin coal seams, especially for …

The backfill-strip mining is gradually applied to shallow coal seam mining for buildings protection because of its good effect, high resource recovery rate, and low filling cost (Guo et al. 2004; Wang et al. 2015a, b; Li et al. 2016; Zhu et al. 2019a, b).The traditional subsidence prediction method in backfill-strip mining is to divide the mining …

Liu Zhongquan; Effect analysis of buried pipe drainage in fully mechanized top-coal caving face in steep and extra-thick seam [J]. Coal Science and Technology, 2017 (S1 vo 45): 74-76+99. Study on ...

Zhang et al. [30] investigated on the coal drawing from thick steep seam with LTCC mining. Liu et al. [31] researched the roof strata conditions, shield pressure, and ground surface subsidence at ...

DOI: 10.1016/S1365-1609(00)00046-0 Corpus ID: 129646198; Probabilistic analysis of subsidence-induced strains at the surface above steep seam mining @article{Torao2000ProbabilisticAO, title={Probabilistic analysis of subsidence-induced strains at the surface above steep seam mining}, author={Javier Tora{~n}o and Rafael …

rsingh1_2@yahoo Thick Seam Mining and Strata Mechanics Department 2 Facts and figures about coal reserve and its exploitation trend in India reveals that the future of the industry lies with underground mining of coal. However, parameters like: depth cover, surface/sub-surface constraints, multi seam mining, steepness, contiguity and

Tu HS, Tu SH, Zhang C, Zhang L, Zhang XG (2017) Characteristics of the roof behaviors and mine pressure manifestations during the mining of steep coal seam. Arch Min Sci 62:871–891. Google Scholar Wang JN, Jiao JL (2016) Criteria of support stability in mining of steeply inclined thick coal seam. Int J Rock Mech Min Sci 82:22–35

China's economy, the proportion of deep steep seam in China's coal mining will increase year by year [1]. However, compared with the shallow coal seam, the geological conditions of the deep coal seam will be more complex. For this kind of large dip angle, especially for the deep coal seam roadway with the influence of weak structural. Read More

1. opencast mining technology for working deep and steep seams (more than 300m depth) deposits of low grade coal. 2. improvement of availability & utilisation of hemm by mine management system. 3. steep seam mining technolgy –ripper dozer combination for hard coal mining. 4. methods for reduction of dilution in coal quality due to

For ultra-thick steep seams, fully-mechanized horizontal or inclined slicing top-coal caving method are specially used [8], [9].Mining-induced ground subsidence is governed by a number of factors, such as dip angle and thickness of seam [10], [15], [16], [17], mining method and roof control mode.Viewed as a whole, the ground subsidence is …

2. combustion. The dip angle of coa l seam in north area is 43-46° and the gas concentration of coal seam. is more than 90%.In order to improve the gas drainage amount an d drainage rate of steep ...

A steep seam similar simulation system was developed based on the geological conditions of a steep coal seam in the Xintie Coal Mine. Basing on similar simulation, together with theoretical ...

Steeply dipping coal seams (i.e., inclination angle between 35° and 55°) account for approximately 15–20% of the coal reserves in China while mining in these seams account for 5–10% of China's production [].More than 50% of such steep coal seams are high-quality coking coal and anthracite, and more than 50% of the coal mines in western …

Modern Mining, 2020(08 vo 36): 232–233+236. [Google Scholar] Li, Jiping; Research and application of gas drainage in high-extraction roadway in 15102 working face of Yutai Coal Industry [J]. Shandong Coal Science and Technology, 2020(06 vo No.238): 106–108+111. [Google Scholar]

1 Introduction. Top-coal caving mining was first applied to the mining of steep coal seams in France, Spain, and the Socialist Federal Republic of Yugoslavia in …

The deposit is characterized by dips from 0 to 90/sup 0/ and multiple groups of seams, often close together and up to 15 meters (49 feet) thick. In these steep seam conditions, particularly in dips from 50 to 90/sup 0/, HBL has developed original mining methods that are based on ascending horizontal cuts with sand hydraulic backfill.

Abstract. Ultra-thick steep coal seam mining will inevitably lead to the increase of greater and violent ground subsidence and deformation. A subsidence …

Coalfields in the north of Spain (Asturias) are mainly steeply dipping and at considerable depth. There is widespread use of caving mining methods at the present time. This …

The coal seam is a monocline structure that belonged to the steep coal seam. The maximum dip angle is 76, the minimum dip angle is 60, and the average dip angle is 67 . The coal seam thickness is 1.23 m to 1.9 m, and the average coal thickness is 1.7 m. The lithology of the coal seam and overlaying and underlying strata are listed in Table1 ...

The geological reserves of a steep mining field in Shanxi reaches 2.1 billion tons with a workable reserve of 1.06 billion tons. The coking coal of high quality was the main component of the coal source. The fully mechanized natural caving mining technology was used in the steep thick coal seam. The seam of panel 5-103 was No. 5 …

The Xintie Coal Mine is under the administration of Qitaihe Branch, Heilongjiang Longmei Mining Group. As shown in Fig. 3, the primary-mining No. 49# steep coal seam, with a ground elevation of + …

This study considered longwall working face No. 41101—located in a steeply inclined coal seam at the Awuzisu coal mine in Xinjiang, China—as an example in which macroscopic shear cracks had occurred in the cement-based filling body of the gob-side entry retention structure. A mechanical model of the support structure for the gob-side …

Steep Seam Coal Mining In Spain. 6th meeting of the indoeu coal working group was held on followed byorkshop on steep seam extraction andisit to northeast region during 1213 may 2011 involving experts from spain to explore the possibilities of exploiting steep seam in this region. the 6th meeting of the indoeu energy panel was held on.

The mining of steeply dipping coal seams involves significant safety risks because of instability caused by the weak nature of surrounding rocks and their movement after …

Jiang et al. (2015) simulated the law of mining stress evolution, coal seam roof motion and fault activation under the thick-hard strata by 3-D numerical calculation method. Ma et al. (2011 ...

1. General situation of the working face The 2637 top coal caving face is located in the 6th cross-cut of the 12th level in Zhaogezhuang Mine. The elevation of the face is from -892.2m to -987.5m. The coal seam is stable and simple, with thickness of 8.58m to 14.27m, 10.54m on average, and angle of 44° to 72°, 51°on average.

1. Introduction. Mining of thick and steeply-inclined hard coal deposits is one of the most di cult engineering challenges. These coal seams are mainly mined in China [1–3]. For …

Coal seam gas content ranges from a few ft3/t to 800 ft3/t for depths of up to 3000 ft. Coal seams are the origin of all gases, and also the reservoir. Methane accounts for 80%-95% of the full gas content, while the balance consists of butane, ethane, propane, hydrogen, argon, carbon dioxide, and oxygen. Coal Seam Degasification

A steeply dipping seam is one with. its dipping angle in the range of 35°-55 °. Mining of such coal s eams is recognized. to be difficult in the mining industry. The reserves of the steep coal ...

This study aimed to investigate the internal dislocation law of coal seam working face under coal pillars with different widths and evaluate the safety of using the combined mining of close-distance coal seams under different layer spacing. Based on elastic–plastic mechanics and mine pressure theory, theoretical calculation and …