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 …

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 …

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 ...

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 …

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.

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

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

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 …

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 ...

Using the discrete element numeric simulation program UDEC,the evolution law of mining-induced fractures in the mining process in steep coal seam was studied. Combined with the study of similar material simulation experi- ment results,the result by numerical calculation was verified. The results indicate that bed separation fissures are the main …

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 …

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 ...

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 …

Barring the diverse and often exceedingly site-specific methods for extraction of thick seams at steep gradients (exceeding 45 de- grees), the array of methods for …

There are many researches on the mine pressure activities of 45°~67°steep and extra thick coal seam, and the research results cover the mining method and layout, the movement of surrounding rock ...

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 + …

Download Citation | Probabilistic analysis of subsidence-induced strains at the surface above steep seam mining | Using profile functions to predict subsidence induced by mining activities has two ...

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 ...

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 ...

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 …

This paper describes a theory developed to predict the subsidence related to very steep and nearly vertical coal seams (70°–90°). This 'theory of the multiple …

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 …

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

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 …

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 coal seam dip angle also influences the stability of the coal mining face and the law of surface subsidence (Yao et al. 2017;Alejano et al. 1999; Asadi et al. 2004). In addition, support ...

The #6 coal includes 6-1 and 6-2 coal seams, with the 6-2 seam as the main seam with an average thickness of 21.0 m and an inclination of 2.4°. The depth of the coal seam is 104 m with a 78.3 m bedrock. The Quaternary alluvium is 25.7 m thick and includes a 21.7 m aquifer. The roof of the 6-2 seam is 24.5 m thick grey sandstone.

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

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 ...

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 …