摘要
以大倾角煤层走向长壁采场为研究对象,分析采场覆岩运动、应力场分布特征,揭示了围岩"关键域"迁移转化特征,认为"关键域"是大倾角煤层开采覆岩垮落形成的非对称"拱壳"形态区域内对覆岩活动起决定作用的岩层,沿工作面倾斜方向"关键域"转换导致不同区域关键岩块形成层位不同,关键岩块相互作用形成倾向"梯阶"结构。根据倾向"梯阶"结构形成特征,建立倾向"梯阶"结构力学模型,分析得出不同区域"关键域"岩梁的受力特征,揭示了"关键域"岩体结构的剪破裂和张破裂机制,确定了"关键域"关键岩块的破坏失稳引起覆岩"拱壳"空间失稳模式,为大倾角煤层安全高效开采奠定理论基础。
With the long-wall stope of steeply dipping seam as the research subject, the overlying strata movement and distribution characteristics of rock stress field have been analyzed, and the conversion characteristic of the critical zone in the surrounding rocks have been revealed. And research indicates that the critical zone is playing a decisive role in overlying strata movement in the asymmetry region of arch shell formed when overburden rock mass fall in mining the steeply dipping seam. In tendency, the critical zone would shift towards different strata, and the scalar structure in tendency direction is formed by the interaction with key rocks. By analyzing the forming characteristics of the scalar structure, the mechanical model is established and the stress feature of rock beam in different critical zones is ob- tained. The shearing and tensile failure mechanism of rock structure is revealed and the spatial instabil- ity mode of overlying arch shell caused by instability of key rock in critical zone is determined, which provides theoretical foundations for safe and efficient mining of steeply dipping seam.
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2017年第2期287-294,共8页
Journal of Mining & Safety Engineering
基金
国家自然科学基金重点项目(51634007)
陕西省自然科学基础研究计划项目(2016JQ5019)
陕西省教育厅专项科学研究计划项目(2016JK1491)
关键词
大倾角煤层
关键域
倾向梯阶结构
破坏准则
失稳模式
steeply dipping seam： critical zone
scalar structure in tendency of coal seam： failure principle
instability mode
