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The coal-bearing strata are mainly Car-boniferous and Permian, with a total thickness of 257m and 18 coal-bearing strata. 3 Coal seam is a thick coal seam sand-wiched between sandstones of Shanxi Formation and is the main coal seam mined in the mining area, with an average thickness of 7.2m and an inclination angle of 26 °~30°.The
Coal seam damage area and its stress distribution law in roadway with medium thickness or extrathick coal seam are important issues for understanding the... DOAJ is a community-curated online directory that indexes and provides access to high quality, open access, peer-reviewed journals.
Introduction of Shearer Accessories Roller. Shearer roller is suitable for mining thin coal seam with coal seam thickness of 0.75-1.5 meters, coal hardness of f ≦ 2.5 and coal seam inclination angle of 16 degrees. When the coal seam inclination exceeds 16, use a unit-supplied hydraulic non-slip winch.
The sensor has the function of indicating the thickness of the coal seam, measuring the natural γ-ray intensity, and storing and processing the data. ... Shandong University, Jinan 250061, China ...
In the study area, the Taiyuan Formation has a thickness of 120 160 m, and consists of siltstone, mudstone, limestone, and coal. The coal in the Taiyuan Formation occurs in up to 18 seams, in which the 6 and 17 coals are mineable. The Shanxi Formation has a thickness of 70 100 m, with 2 3 coal seams. The No.3 coal was divided into upper
Jan 01, 2017· The coal seam thickness is 6.9 m, and the dip angle is 0~5 degrees. The hardness coefficient is f =2~3. The immediate roof of the coal seam is sandstone 5.51~20.33 m thick, averaging 11.89 m. Fractures are well developed. The panel cutting height is 3.4 m and caving height is 3.5 m with unidirectional cutting.
Nov 01, 2017· The coal seam characteristics which have been investigated in cavability studies mainly include the coal strength, coal discontinuities, coal cutting height and top coal thickness. The top coal cavability is an inherent characteristic that indicates the sensitivity and possibility of coal to cave under the action of strata abutment stress.
the variation of coal seam thickness, showing that stoping from thin to thick coal seams was beneficial for controlling rock bursts. In general, research attention for these kinds of rock bursts remains insufficient. (a) (b) Figure 1. Tectonic areas with facies change. (a) Variation of coal seam thickness, (b) variations of coal
Journal of China Coal Society, 1999, 24(6): 576–580 (in Chinese). [6]Li Jiaxiang. Using fuzzy mathematics prediction of water inrush from coal seam floor[J]. Journal of Shandong Mining Institute, 1990, 9(1): 5–10 (in Chinese).
Nov 01, 2015· Thickness of a coal seam is an important geological parameter during selection of a suitable underground mining method for its efficient extraction. A coal seam of around 3–4 m thickness is, generally, observed to provide normal working height for efficient extraction and is suitable for most of the conventional mining methods.
Report issued by the U.S. Bureau of Mines discussing bituminous coal and lignite seams found in the United States. The thickness of seams from several U.S. states is compared, as well as the mining methods employed. This report includes maps, tables, and illustrations.
and Thickness Effect of Long Wall Caving in Thick Loose Seam with Weak Cementation Yao Lu Corresponding author State Key Laboratory of Mining Disaster Prevention and ControlCo-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and ... coal seam is 10-12.5 times of mining height. The mechanical
Mar 16, 2021· The coal seam in the working face belongs to 2-2 upper coal seam, the average dip angle of the coal seam is 1° 15′, and its average thickness is 5.5 m. The roof of the coal seam is fine sandstone and sandy mudstone, and the comprehensive column diagram of …
winning of coal are going to play an important role in future coal production. In India, coal seams of 4.8m thickness or higher are called thick. Nearly 60% of the total coal reserves that are workable by underground mining methods in the country are thick coal seams. To fulfil the increasing demand of coal, most of these thick coal seams have been
are typical coal-measures in the North China coal basin. The Permian Shanxi Formation bears 2–3 coal seams, including the upper and the lower seams of No. 3. The upper seam has a thickness of 0–6.57 m and the lower seam has a thickness of 0–5.17 m, where zero means sedimentary absence in some of the locations. The Shanxi
Strength criterion effect of the translator and destabilization model of gas-bearing coal seam Wang Ganga,b,⇑, Wang Ruic, Wu Mengmengd, Fan Chengb, Song Xiangb a Mine Disaster Prevention and Control-Ministry of State Key Laboratory Breeding Base, Shandong University of Science and Technology, Qingdao 266590, China bCollege of Mining and Safety Engineering, Shandong …
4.201m. The average thickness of coal seam is 4.04m, and the subsidence coefficient within the working face is 1.04 (the ratio of maximum settlement value to average thickness of coal seam). According to [41], the point with settlement value of 10mm is the mining influenced boundary point. According to the curve of the last survey cycle, the ...
LIU Songliang,GUO Jianping. Igneous rock features and its influence on coal seam and coal quality of Huanghebei Coalfield,Shandong Province[J]. Coal Geology of China,2003,15(6):14-15. [16],,,. [J].,2011,23(8):70-72. HUANG Xinglong,LI Cuifang ...
The total coal in the three state-owned coal mines in the Shandong ... carbonaceous mudstone at the top of the coal seam. The thickness of this layer varies from 0.25 to 0.4 m, with an average of ...
Jurassic, and Neogene geological periods. The multiple coal seams (the upper and lower Seam no. 3), are productive coal seams in the Permian Shanxi Formation. The average thickness of the upper seam is 5.9 m, whereas that of the lower seam is 4 m. Zero thickness occurs in …
Aug 12, 2020· coal seams, where the No. 3 coal is the lowermost seam and is one of the dominating mineable coal seams of the Shanxi Formation in this area [26,38] (Figure 2). In the study area, the thickness of the No. 3 coal seam varies from 1.3 to 5.1 m (2.9 m on average). In some cases, the No. 3 coal seam is split
Jul 28, 2016· 10%· Plan view of the −430 m level in the Baodian Mine, Shandong Province, China showing the shallow of the No. 3 coal seam. The red line is the 46 m bedrock thickness isopach, the roadway has been aligned to be inside that line for safety reasons, and the width of the 302 working face is to be 204 m
May 09, 2021· Lizuizi Coal Mine is a coal and gas outburst mine located in Huainan, Anhui (as shown in Figure 13), and the test target coal seam is A1 coal seam, with an average thickness of 3.9 m, an average inclination of 8 degrees, a vertical stress of 21.71 MPa, and horizontal stress coefficients of 1.1 and 0.8. In this experiment, a total of six ...
About 7471 item dissertation in line with geotechnical engineering query results,the following is 2301 to 2350(Search took 0.050 seconds). Study on the Key Rock Mass Engineering Problems of Nibashan Highway Tunnel, DengLin/Southwest Jiaotong University,5/377; Research on Large Deformation Mechanism of Soft Rock of Baozhen Tunnel, GuoFuLi/Beijing Jiaotong University,1/644
Mar 04, 2021· The thickness of #3 upper coal seam is 5.86 m, and #3 lower coal seam is 3.18 m. The tenth mining area is divided into six working faces, whose length of working faces 01 and 02 is 170 m, and 03 to 06 is 200–240 m.
Additionally, coal seam thickness and geology are factors in the selection of a mining method. The most economical method of coal extraction for surface mines is the electric shovel or drag line. The most economical form of underground mining is the long wall, which is a shear blade that runs along sections of the coal seam.
Dec 01, 1999· The coal seam thickness in the Shandong mining district shows significant variations, with higher thickness in the northern and central belts compared with the southern belt. The Taiyuan coal distribution in the Shandong district may be summarised as follows. (a) The northern belt contains eight to ten coal beds (five to seven workable seams ...
Shandong Institute Of ... The hyperbolic dependences of the drum shearer advance speed and capacity on the coal seam thickness are found. Influence of coal sloughing coefficient on drum shearer ...