期刊论文

Instability mechanism of sublevel filling pillar and its reasonable size in steeply inclined coal seam

Feng, Tao(tfeng@hnust.edu.cn)

中文

采矿与安全工程学报

1673-3363

2018

35

1

49-57

10.13545/j.cnki.jmse.2018.01.007

51274095:国家自然科学基金 51678226:国家自然科学基金 201402:煤矿安全开采技术湖南省重点实验室开放基金

本校为其他机构

为研究急倾斜综采走向分段充填柱体的失稳机理及合理尺寸,以湘永煤矿2463工作面为背景,对急倾斜走向分段充填存在采空区悬顶距离小于和大于顶板极限跨距的2种情形,建立2种边界条件下的超静定梁模型,分别推导顶板岩梁的最大弯矩公式,分析充填体支撑反力、跨距、宽度和工作面支架支撑力对最大弯矩的影响关系.结果表明:1)充填柱体支撑反力和顶板最大弯矩随着充填柱体的跨距增大而增大,而工作面的支架支撑力对顶板最大弯矩和充填体支撑反力影响较小;2)充填柱体支撑反力增大能减小顶板的最大弯矩值;3)充填柱体在单轴压缩条件下,出现二次峰值后,形成"X"形态的剪切破坏;充填体试件中部未破坏区域随着胶...

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 t...