采矿与安全工程学报2018，Vol.35Issue(1)：49-57,9.DOI:10.13545/j.cnki.jmse.2018.01.007
急倾斜走向分段充填柱体失稳机理及合理尺寸
Instability mechanism of sublevel filling pillar and its reasonable size in steeply inclined coal seam
摘要
Abstract
To study the mechanical mechanism and reasonable size of sublevel filling pillar body, the 2463 workface in Xiangyong coal mine is as the research background and two mechanical models of strike strata beam has been established for two situations, which are less than and greater than roof limit across from hanging top distance of sublevel filling along the strike direction, respectively. The formula of roof rock beam of maximum bent moment are derived. Using such formula, effects of maximum bent moment from filling body support anti-force, and the span between two filling body, and width and support force of bracket are analyzed. The results show that: 1) The support reaction force and the maximum bending moment increases with the increase span of filling pillar, whereas the maximum bent moment and support force of filling column has little influence on the support force of bracket; 2) The maximum bent moment reduces with the increase of the support reaction force of filling pillar; 3) The strength peak of filling column appears twice at the uniaxial compression condition. The "X" shape of shear failure appears. The area of the middle part of the backfill specimen is increased with the propor-tion of cemented material; 4) Through mechanical model calculations and numerical simulations, sublevel filling parameters along the strike direction of Xiangyong coal mine is determined:the span of filling pillar is 26 m, and its reasonable width is 12 m, elastic modulus of filling pillar is not less than 0.5 GPa.关键词
急倾斜煤层/综采/走向分段充填/失稳机理/合理尺寸Key words
steep seam/fully mechanized mining/sublevel filling along the strike/instability mechanism/reasonable size分类
矿业与冶金引用本文复制引用
姚琦,冯涛,廖泽,黎永索..急倾斜走向分段充填柱体失稳机理及合理尺寸[J].采矿与安全工程学报,2018,35(1):49-57,9.基金项目
国家自然科学基金项目(51274095,51678226) （51274095,51678226）
煤矿安全开采技术湖南省重点实验室开放基金项目(201402) （201402）
