采矿与安全工程学报2017，Vol.34Issue(4)：624-631,8.DOI:10.13545/j.cnki.jmse.2017.04.003
高位硬厚岩层下采动裂隙和支承应力演化特征及其对瓦斯运移的影响
Evolution characteristics of mining-induced fracture and abutment stress under high-position hard thick stratum and its effect on gas migration
摘要
Abstract
In view of the structural characteristics and stress state of overlying high-position hard thick stratum, a mechanical model affected by the interaction of uniform load and body force was built.The mechanical criterion of hard thick stratum breaking mode was obtained. Through similar material simu-lation test and discrete element numerical simulation, the evolution characteristic of overlying min-ing-induced fracture and abutment stress and its effect on gas migration under the high-positionmain key stratum was studied, and the research results were validated with an engineering case. The re sults have shown that significant variations occur to the mining-induced fracture development, abutment stress distribution of coal and rock, and stress relief effect under the high-position main key stratum conditions; the upward development or transfer is blocked. A trapezoidal compaction zone forms in the middle, parallel quadrilateral rupture zones form in both sides under the main key stratum, and the frac-tures develop in a shape of a saddle. Separation distribution at the bottom of main key stratum evolves from the shape of "single valley" to the shape of "inverted trapezoid" and then to the shape of "two val-leys". High abutment stress of the coal and rock under the main key stratum has high concentration and a large scope of influence, but it decreases significantly after the fracture and migration of the main key stratum. Gob region of stress relief and fracture development exists under the main key stratum, and free gas could migrate to the separate strata space with negative pressure through the breaking fractures, which would induce the ground borehole gas dynamic phenomenon when the main key stratum moves.关键词
高位硬厚岩层/采动裂隙/支承应力/瓦斯运移/相似材料模拟试验/数值模拟Key words
high-position hard thick stratum/mining-induced fracture/abutment stress/gas migration/similar material simulation test/numerical simulation分类
矿业与冶金引用本文复制引用
蒋金泉,王普,郑朋强,武泉林..高位硬厚岩层下采动裂隙和支承应力演化特征及其对瓦斯运移的影响[J].采矿与安全工程学报,2017,34(4):624-631,8.基金项目
国家自然科学基金项目(51374139) （51374139）
山东省自然科学基金项目(ZR2013EEM018) （ZR2013EEM018）
山东科技大学科研创新团队支持计划项目 （）
