inclined dip coal seams surface mining

: Subsidence control method by inversely-inclined slicing ...
2021-11-4 · Steep coal seams (dip angle α > 45°) are widely dispersed in China. 130 mines working such kind of coal seams are distributed in 20-odd mining areas over northeast, north and other parts of China .As steep coal seams vary in thickness, dip angle and geological conditions, the methods for mining such coal seams are many and varied ().Therefore, the law governing
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: Numerical Simulation and Analysis of Surface and ...
2019-4-23 · After mining in inclined seam with large dip angle, the roof caves in under the action of ground stress. Because of the large dip angle, the caved rock will slide downward until it accumulates in front of the stopping line of upper mining (Wang et al. 2013b; Ren et al. 2008).In order to study the stress distribution and failure characteristics of the mining roof along the
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: A New Theoretical Method to Predict Strata Movement
2021-3-11 · The mining-induced strata movement and surface subsidence are closely related to the dip angle of coal seam. However, most surface subsidence prediction methods are empirical, and only suitable for nearly flat coal seam mining. In this paper, a new theoretical method is proposed to predict the strata movement boundary and surface subsidence caused by inclined
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: Experimental analysis of control technology and ...
2021-10-22 · The deformation and failure forms of inclined coal seam roadway under the joint action of dip angle and various geological conditions are complex, and there is a lack of targeted support measures ...
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: Assessment of the Strength of Inclined Coal Pillars ...
The inclined coal pillars, formed during the underground extraction of the inclined coal seam, are different from the flat coal pillars due to the high strength anisotropy of the inclined bedded rock, and the asymmetrical stress distribution. To ease the manoeuvring of the men and machinery in the inclined coal mine, the pillars are developed along the apparent dip.
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: Deformation characteristics of a roadway in steeply ...
2020-6-1 · Generally, high rock strata dip makes the underground mining difficult. Jawed and Sinha 13 proposed that coal seams that dip more than 15° are classified as steeply inclined seams which pose strata control problems. The component of strata weight in dip direction increases whereas the component normal to bedding plane reduces which makes the ...
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: Underground mining of steep seams in India
2013-2-21 · Geo-mining conditions Steep coal seams of the country are thick and thin and are stuck below hard and massive formations of Jharia coalfield to highly folded, soft and fragile formations of Makum coalfield. Majority of the steep seams consist good quality of coal and susceptible to spontaneous heating and fire during working.
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: Drifts/Inclined Shafts | Introduction | underground COAL
Drifts/Inclined Shafts. The angle at which a drift becomes an inclined shaft is somewhat subjective, but there is some agreement that anything above 30 o to the horizontal is a shaft, not a drift.. A major advantage of drift or inclined shaft access versus vertical shaft access is the ability to move large volumes of equipment, materials and personnel in a properly designed and
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: Development and prospect on fully mechanized mining
2017-8-27 · and applicability to coal seams of thicknesses 0.8–1.25 m. This event marked the breakthrough of the 1.0 m limitation for Chinese FMM technology and created a new domestic benchmark in the nation’s FMM technique and equipment used to mine thin seams (Wang 2009). Recent mining practices on thin seams in some coal
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: Experimental analysis of control technology and ...
2021-10-22 · The deformation and failure forms of inclined coal seam roadway under the joint action of dip angle and various geological conditions are complex, and there is a lack of targeted support measures ...
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: Process of overburden failure in steeply inclined multi ...
2021-5-19 · China has large reserves of steeply inclined coal seams, accounting for 15% to 20% of the total coal reserves, and more than 50% of the mines in western China are mining steeply inclined coal seams . The mining of steeply inclined coal seams often results in surface collapse pits and stepped depressions , which pose a great threat to buildings ...
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: Profiling Function for Surface Subsidence Prediction in ...
A new profiling function is proposed to predict the value of surface subsidence over longwall panel in the inclined seams. This function was used at the Parvada-2 mine in Tabass coal region, Iran.
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: Cemented Backfilling Mining Technology for Gently
2021-2-15 · To improve the efficiency and reduce costs of cemented-fill mining, we propose a continuous mining and continuous backfilling (CMCB) method based on the coal resources at the Yuxing mine in Inner Mongolia, China, and constructed a complete filling material transportation system. The new technology is suitable for cemented-fill mining of gently inclined coal seams.
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: Assessment of the Strength of Inclined Coal Pillars ...
The inclined coal pillars, formed during the underground extraction of the inclined coal seam, are different from the flat coal pillars due to the high strength anisotropy of the inclined bedded rock, and the asymmetrical stress distribution. To ease the manoeuvring of the men and machinery in the inclined coal mine, the pillars are developed along the apparent dip.
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: Glossary of Mining Terms - Coal Education
2018-1-4 · Steeply inclined - Said of deposits and coal seams with a dip of from 0.7 to 1 rad (40 degrees to 60 degrees). Stemming - The noncombustible material used on top or in front of a charge or explosive. Strike - The direction of the line of intersection of a bed or vein with the horizontal plane. The strike of a bed is the direction of a straight ...
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: v118n1a3 Ground control in mining steeply dipping coal ...
2018-3-19 · In the Chinese coal industry, a steep coal seam is defined as one that dips at an angle greater than 45° (Cao and Gou, 2011), as shown in Figure 1. In contrast to coal seams with little or no (flat) dip angle, mining production from steeply dipping seams is inherently low and the cost is relatively high. These factors hinder
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: Drifts/Inclined Shafts | Introduction | underground COAL
Drifts/Inclined Shafts. The angle at which a drift becomes an inclined shaft is somewhat subjective, but there is some agreement that anything above 30 o to the horizontal is a shaft, not a drift.. A major advantage of drift or inclined shaft access versus vertical shaft access is the ability to move large volumes of equipment, materials and personnel in a properly designed and
Read More

: WV chapter 5 final
2021-7-19 · (See Appendix 1-3). Readily distinguishable lithologic units, or marker beds, such as named coal seams or rock units, should be indicated along with all aquifer units. For surface mining applications, the relative position of all acid- or toxic-forming zones, and all zones proposed for use as topsoil substitutes, must be shown. 3. Fence Diagrams
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: Development and prospect on fully mechanized mining
2017-8-27 · and applicability to coal seams of thicknesses 0.8–1.25 m. This event marked the breakthrough of the 1.0 m limitation for Chinese FMM technology and created a new domestic benchmark in the nation’s FMM technique and equipment used to mine thin seams (Wang 2009). Recent mining practices on thin seams in some coal
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: Technological Adaptation of Internal Dumping to the ...
With surface mining of inclined and steeply dipping coal deposits, the so-called deeping longitudinal mining methods with a gradual deepening of mining from the surface to the final depth are widely spread, while orienting the mining front along the strike line of the seams (strata). When using such mining methods, the volumes of internal dumping are limited or completely
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: Process of overburden failure in steeply inclined multi ...
2021-5-19 · China has large reserves of steeply inclined coal seams, accounting for 15% to 20% of the total coal reserves, and more than 50% of the mines in western China are mining steeply inclined coal seams . The mining of steeply inclined coal seams often results in surface collapse pits and stepped depressions , which pose a great threat to buildings ...
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: Seam dip angle based mining subsidence model and its ...
The novel mining subsidence prediction model is developed with the dip angle of a bedded ore deposit as a variable. It is applicable for coal seams with a dip angle ranging from 0 to 90°.
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: Field and Numerical Investigation on the Coal Pillar ...
2021-7-28 · 3.2. Numerical Modeling. To fully understand the stability of a mining entry with 2.0 m section coal pillars under the influence of dip angle of coal seam, a FLAC 3D numerical simulation with the “Mohr–Coulomb criterion” based on the engineering geological conditions of 21015 working face was established as shown in Figure 3.The dimension of the numerical model was .
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: Assessment of the Strength of Inclined Coal Pillars ...
The inclined coal pillars, formed during the underground extraction of the inclined coal seam, are different from the flat coal pillars due to the high strength anisotropy of the inclined bedded rock, and the asymmetrical stress distribution. To ease the manoeuvring of the men and machinery in the inclined coal mine, the pillars are developed along the apparent dip.
Read More

: Glossary of Mining Terms - Coal Education
2018-1-4 · Steeply inclined - Said of deposits and coal seams with a dip of from 0.7 to 1 rad (40 degrees to 60 degrees). Stemming - The noncombustible material used on top or in front of a charge or explosive. Strike - The direction of the line of intersection of a bed or vein with the horizontal plane. The strike of a bed is the direction of a straight ...
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: Appendix Y - Glossary of Mining Terms as used in this ...
2014-7-24 · Angle of dip - The angle at which strata or mineral deposits are inclined to the horizontal plane. Angle of draw - In coal mine subsidence, this angle is assumed to bisect the angle between the vertical and the angle of repose of the material and is 20° for flat seams. For dipping seams, the
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: WV chapter 5 final
2021-7-19 · (See Appendix 1-3). Readily distinguishable lithologic units, or marker beds, such as named coal seams or rock units, should be indicated along with all aquifer units. For surface mining applications, the relative position of all acid- or toxic-forming zones, and all zones proposed for use as topsoil substitutes, must be shown. 3. Fence Diagrams
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: CHAPTER 11 Mining Technology - Princeton University
2007-3-19 · face coal mining now predominates in most areas of the West. Because coal seams are generally thicker and nearer the surface in most Western States, compared to the East, they are more amenable to recovery by sur-face mining techniques. Surface mining operations are usually well-suited to the many areas of the West that have not yet ex-
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: Analysis of coal face stability of lower coal seam under ...
2022-1-11 · Aiming at the problem of coal face failure of lower coal seam under the influence of repeated mining in close coal seams, with the working face 17,101 as a background, the coal samples mechanics ...
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