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为研究深部近距离煤层群下向卸压开采高应力演化的特征,根据潘二煤矿深部近距离煤层群8煤和6煤地质与开采技术条件,设计了下向卸压开采的二维相似材料模拟试验模型,对8煤和6煤开采引起的采动应力进行监测。系统分析了8煤下向开采与6煤开采后的采场围岩采动应力、岩层运移及不规则煤柱对采动应力演化的影响,获得了近距离煤层群8煤下向卸压开采的顶底板采动高应力演化特征及6煤回采期间覆岩运移、采动应力裂隙演化和来压特征,得出了下向卸压开采不规则煤柱对采动应力、裂隙分布的影响规律。研究不仅为以采动高应力演化为主导作用的煤岩动力灾害防治提供了理论基础,也为卸压开采采场参数设计与优化提供了技术支撑。
In order to study the characteristics of the high stress evolution in the downward pressure-relieving mining of deep-seated coal seams, according to the geological and mining technical conditions of No.8 and No.6 coal seam in the deep near coal seams of Pan II coal mine, two-dimensional similar materials Simulation test model to monitor the mining stress caused by 8 and 6 coal mining. This paper systematically analyzes the influence of mining stress, rock movement and irregular coal pillar on the evolution of mining stress in 8 coal underground mining and 6 coal mining, The top and bottom mining high stress evolution characteristics of mining and the overlying strata migration, the evolution of mining stress and fissure evolution during the 6th coal mining, Affect the law. The research not only provides a theoretical basis for the prevention and control of dynamic coal and rock disaster with mining-induced high stress evolution, but also provides technical support for the design and optimization of stope parameters in pressure relief mining.