caa a22 4500 605454361 CHVBK 20210128100206.0 cr unu---uuuuu 210128e20151101xx s 000 0 eng 10.1007/s10064-014-0685-6 doi (NATIONALLICENCE)springer-10.1007/s10064-014-0685-6 The effect of a multi-gob, pier-type roof structure on coal pillar load-bearing capacity and stress distribution [Elektronische Daten] [J. Yang, C. Liu, B. Yu, F. Wu] In order to evaluate the effect of established gob coal pillars on the stress in lower rock strata, in the context of of mining in Jurassic coal mine in the Datong mine field, this study theoretically analysed a collapsed roof structure in gobs of Jurassic coal strata and the physics of concentrated loads on coal pillars. The collapse state of roofing in the gobs inclined with the working face and the effect of established coal pillars on the lower rock strata were obtained. Results indicated: a stabilised natural arch structure is formed in Jurassic coal strata by squeezing of collapsed upper roof blocks inclined with the working face, and the arch springing applies a highly concentrated load on the established coal pillars; affected by the established coal pillars, the upper roof of multi-gob coal pillars appears to be a pier-type structure, used as a supporting point for the upper roof load; we propose a method of calculating the stress in the lower rock strata imparted by the coal pillars. In the context of mining Jurassic coal strata at the Tongxin coal mine in the Datong mine field, the depth of the strata affected by the concentrated stress imparted by established gob coal pillars was calculated. The effective range of energy density concentration was also calculated. Springer-Verlag Berlin Heidelberg, 2014 Multi-gob nationallicence Coal pillar nationallicence Roof structure nationallicence Stress in coal pillar nationallicence Pier structure nationallicence Linear loading nationallicence Yang J. School of Mines, State Key Laboratory of Coal Resources and Safe Mining, Key Laboratory of Deep Coal Resource Mining, Ministry of Education, China University of Mining and Technology, 221116, Xuzhou, Jiangsu, China aut Liu C. School of Mines, State Key Laboratory of Coal Resources and Safe Mining, Key Laboratory of Deep Coal Resource Mining, Ministry of Education, China University of Mining and Technology, 221116, Xuzhou, Jiangsu, China aut Yu B. Datong Coal Mine Group Company, 037003, Datong, Shanxi, China aut Wu F. School of Mines, State Key Laboratory of Coal Resources and Safe Mining, Key Laboratory of Deep Coal Resource Mining, Ministry of Education, China University of Mining and Technology, 221116, Xuzhou, Jiangsu, China aut Bulletin of Engineering Geology and the Environment Springer Berlin Heidelberg 74/4(2015-11-01), 1267-1273 1435-9529 74:4<1267 2015 74 10064 https://doi.org/10.1007/s10064-014-0685-6 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10064-014-0685-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yang J. School of Mines, State Key Laboratory of Coal Resources and Safe Mining, Key Laboratory of Deep Coal Resource Mining, Ministry of Education, China University of Mining and Technology, 221116, Xuzhou, Jiangsu, China aut NATIONALLICENCE 700 1- Liu C. School of Mines, State Key Laboratory of Coal Resources and Safe Mining, Key Laboratory of Deep Coal Resource Mining, Ministry of Education, China University of Mining and Technology, 221116, Xuzhou, Jiangsu, China aut NATIONALLICENCE 700 1- Yu B. Datong Coal Mine Group Company, 037003, Datong, Shanxi, China aut NATIONALLICENCE 700 1- Wu F. School of Mines, State Key Laboratory of Coal Resources and Safe Mining, Key Laboratory of Deep Coal Resource Mining, Ministry of Education, China University of Mining and Technology, 221116, Xuzhou, Jiangsu, China aut NATIONALLICENCE 773 0- Bulletin of Engineering Geology and the Environment Springer Berlin Heidelberg 74/4(2015-11-01), 1267-1273 1435-9529 74:4<1267 2015 74 10064