深部两软煤层沿空巷道冲击地压成因与防治研究

针对两软煤层的地质条件,建立了两软煤层冲击地压发生的力学模型。通过对模型的力学分析与现场实践,得出了深部两软煤层条件下冲击地压发生的主要原因,是受上部力源层和下部稳定层夹持下的软弱冲击层出现应力集中和能量积聚,采动活动诱发积聚的能量向破碎缓和区突然释放,造成煤岩块瞬时喷出,形成冲击地压。从深部两软煤层冲击地压发生的应力条件、能量条件、物质条件和冲击地压诱发因素等方面进行分析研究,制定了转移应力、保持护巷煤柱稳定性、巷帮加固、松动帮部、形成顶板支护体阻挡结构的冲击地压防治措施,并进行了现场实践,实现了工作面安全高效无冲击开采。

Causes for rockburst and control of gob side entry in deep two soft coal seams

For the geological conditions of two soft coal seams, mechanical models for rockburst occurring in two soft coal seams. Mechanical analysis and field practice of these models show that the main causes for rockburst in deep two soft coal seams are the stress concentration and energy accumulation in the soft alluvium that is clamped in the upper force source layer and the lower stable layer, and the energy accumulated from mining activities which releases to crushing mitigation areas, causing instantaneous ejection of coal and rock blocks and forming the rock burst. Through the researches on stress, energy, material conditions and inducing factors for burst of deep two soft coal seams, the prevention measures for rockburst of block structure of the roof support structure such as transferring stress, maintaining the stability of chain pillars, strengthening coal side, and loosening working slope are formulated. Field practice is made so as to realize the safe and high-efficiency non-impact mining at working faces.