煤矿安全2019，Vol.50Issue(2)：204-207,213,5.DOI:10.13347/j.cnki.mkaq.2019.02.048
采空区底板不同深度岩体裂隙演化规律
Fracture Evolution Law of Rock Mass at Different Depths of Floor in Gob
摘要
Abstract
In order to study the evolution laws of rock mass fracture at different depths of gob floor, firstly, the vertical and horizontal stress distribution at different locations of floor are discussed with the advancing of working face. During the advancement of the face, the vertical stress changes a lot compared with horizontal stress which changes a little, overall, the change process of floor stress can be regarded as: the confining pressure is constant, the axial pressure increases first and then decreases, and may reduce to zero or even change the axial pressure from compressive stress to tensile stress. Then taking the Xinhua Coal Mine as an example, the distribution laws of crack angle at different depths of floor and the relationship between floor depth and fracture number are acquired through UDEC simulation software, the results show that the number of fractures in the floor decreases with the depth of the floor until it is no longer developed. The cracks in the shallow depth are mainly with small angle or Ⅱtype shear crack, and the cracks in the large depth are mainly shear-expansion with lager angle.关键词
采空区/底板/裂隙演化/深度/煤与瓦斯突出Key words
gob/floor/fracture evolution/depth/coal and gas outburst分类
矿业与冶金引用本文复制引用
郭良,张春雷..采空区底板不同深度岩体裂隙演化规律[J].煤矿安全,2019,50(2):204-207,213,5.基金项目
国家重点研发计划资助项目(2016YFC0801403) （2016YFC0801403）
国家自然科学基金重点资助项目(51634001) （51634001）
江苏省重点研发计划资助项目(BE2015040) （BE2015040）
