Strata-pressure behavior of double-unit mining method combining fully-mechanized and mechanized coal face

• Published in: Journal of coal science & engineering, China Vol. 19; no. 4; pp. 454 - 461
• Main Authors: Zhao, Fu-Jun, Xu, Yan-Fei, Wang, Guo-Ju
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 2013
• Subjects: Earth and Environmental Science; Earth Sciences; Geochemistry; Geology; Geophysics/Geodesy; Geotechnical Engineering & Applied Earth Sciences; Mechanical Engineering; 全机械化; 单位; 地层压力; 复杂地质条件; 工作面开采; 应力集中系数; 行为; 采煤工作面; superposition abutment pressure; roof subsidence coefficient; stress concentration factor; double-unit face; alternate distance
• ISSN: 1006-9097; 1866-6566
• DOI: 10.1007/s12404-013-0403-1

Based on the engineering background of double-unit face mining under complicated geological conditions and the lagging fully-mechanized face surpassing the fore mechanized face of double-unit face in Zhou Yuanshan coal mine, strata-pressure behavior in the process was analyzed based on FLAC3D and on-site measurement. The results show that the stress concentration factor of superposition abutment pressure and the alternate distance of double-unit face are meeting gauss function, the relationship between the depth of stress concentration point and alternate distance also meets gaussian function. When the alternate distance is larger than 24 m, the superimposition of pilot support pressure in the double-unit face is weak. When the alternate distance is more than 12-15 m, the changes of the roof subsidence coefficient and the depth of stress con- centration point are stabilized; when the alternate distance is 3-6 m, the fore working face end is in the greatest impact area of superposition abutment pressure, this area should be avoided in determining the reasonable alternate distance.