浅埋近距离煤层过斜交区段煤柱开采矿压规律研究
Law of strata behaviors in shallow contiguous coal seams mining under oblique district coal pillars
陶志勇 1黄庆享 2范东林 1陈苏社 1王伦言 2贺雁鹏 2王庆雄1
作者信息
- 1. 国能神东煤炭集团有限责任公司,陕西 神木 719315
- 2. 西安科技大学 能源学院,陕西 西安 710054
- 折叠
摘要
为了探究浅埋近距离煤层工作面开采过不同斜交角度煤柱的矿压规律,保障工作面安全高效回采,采用现场实测和数值模拟相结合的方法,分析了 11°、30°、45°、60°和 75°斜交角度的采动应力演化特征,揭示了工作面过不同斜交角度煤柱的应力变化规律.结果表明:根据过 11°斜交煤柱矿压规律实测,工作面来压位置随煤壁与斜交煤柱叠加区而移动,在工作面中部压力最大,机尾次之,机头最小;工作面机尾过煤柱时应力集中最明显;中部过斜交煤柱时,随着斜交角的增大,超前煤壁峰值应力自30°以内为中部宽缓单峰,45°～75°为中部斜交区和机尾双峰,且机尾峰值较大;机尾最大超前应力峰值随斜交角的减小而增大,峰值越靠近机尾;斜交角超过 45°时工作面中部出现应力峰值,表现为双峰,该研究可为类似工作面过斜交煤柱开采提供借鉴意义.
Abstract
In order to explore the law of strata behaviors in shallow contiguous coal seams mining under oblique district coal pillars and guarantee the safe and efficient mining,we analyzed the mining stress evolution characteristics when mining along different oblique angles,i.e.11°,30°,45°,60° and 75°,based on field measurement and numerical calculation.The research results show that:in terms of on-site measurement,when the oblique angle is 11°,weighting position in the mining face moves with the superposition area of the coal wall and the oblique coal pillars;the pressure is large on the middle part,medium on the tail,and small on the head of the mining face.The stress concentration is the most prominent when the mining face tail passes under the coal pillars.When the middle part of the mining face intersects at oblique angles with the coal pillars,as the oblique angle increases,the advance stress of coal wall changes,which shows a wide and gentle unimodal distribution within 30° oblique angle;and shows double peaks at the middle and tail of the mining face between 45°～75°,and the tail peak is higher.When the oblique angle decreases,the peak of the maximum advance stress on tail of the mining face rises and gets closer to the tail;and when the oblique angle exceeds 45°,another stress peak appears in the middle of the mining face,showing double peaks.The research can provide a reference for mining at similar working faces crossing oblique coal pillars.
关键词
浅埋近距离煤层/斜交煤柱/应力叠加区/不同斜交角度/矿压显现Key words
shallow contiguous coal seams/oblique coal pillars/stress superposition area/different oblique angles/strata behaviors引用本文复制引用
基金项目
国家自然科学基金(52074211)
国家自然科学基金(52304153)
出版年
2024
NETL
NSTL
万方数据