摘要
为了分析南梁煤矿工作面过沟谷底部时发生动载问题的原因,通过相似模拟研究、理论计算分析,对工作面过沟谷矿压显现的机理进行了研究。研究表明:工作面过沟谷底部时易发生切顶、煤壁片帮、台阶下沉等动载现象。在实验和理论分析的基础上,提出了工作面在推进过程中形成关键层"非均布载荷梁"结构,建立了关键层非均布载荷梁结构力学模型,得到了上覆岩层运动过程中相邻关键块失稳形成"滑移回转载荷"的计算公式,揭示了非均布载荷梁的破断以及瞬间滑移回转载荷的形成是导致动载发生的机理,为预防工作面过沟谷底部时发生动载提供了理论依据。
This study focuses on the reason of dynamic loading issue when working face passing through the bottom of gully area in Nanliang coalmine. The mechanism of mine pressure behaviors in gully area was studied using similar simulation and theoretical analysis. Results reveal that the dynamic loading phenomena such as roof cutting, coal wall falling and step sinking are easy to occur when working face passing through the bottom of gully area. The key layer "non-uniform load beam" structure formed during working face advancing was put forward. The mechanical model of key layer non-uniform load beam structure was established. Meanwhile, the calculating formula for "slip rotary load" of adjacent key blocks during overlying rock movement was obtained, which indicate the breaking of non-uniform load beam and the formation of instantaneous slip rotating load mainly result in the occurrence of dynamic loading. Outcomes of this study could provide theoretical basis for prevention of dynamic loading occurrence when working face passing through the bottom of gully area.
作者
张杰
龙晶晶
杨涛
王斌
周府伟
ZHANG Jie;LONG Jingjing;YANG Tao;WANG Bin;ZHOU Fuwei(School of Energy Engineering,Xi'an University of Science and Technology,Xi'an,Shaanxi 710054,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2019年第6期1222-1227,共6页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51774229)
陕西省创新能力支撑计划-科技创新团队项目(2018TD-038)
陕西省自然科学基础研究计划(陕煤联合基金)项目(2019JLM-41)
关键词
浅埋沟谷地形
非均布载荷梁
滑移回转载荷
动载机理
shallow-buried valley topography
non-uniform load beam
slip rotary load
dynamic loading mechanism
