深部巨厚砾岩层下高应力煤柱冲击地压防治技术

摘要

In order to solve the mine pressure bump problem occurred in the coal mining face near the high stress coal pillar under deep ul-tra thick conglomerate stratum,based on the coal pillars left by No. 2410 Coal Mining Face and No. 2409 Coal Mining Face in Huafeng Mine as a study object,by view of a mining and excavation layout,in-situ stress and mining stress,the paper analyzed the influences of the mine pressure bump caused.The results showed that No.2410 Coal Mining Face had a high mine pressure bump danger when the coal min-ing face passed through coal pillars of No.2409 Coal Mining Face and some area would have high mine pressure bump danger.The mine pressure bump under the such condition was the high stress pressure bump formed in the left coal pillar or area around the sectional coal pillar and meanwhile with the stability lost in the coal pillar or the movement of the ultra thick conglomerate caused by the mining opera-tion,the danger of the mine pressure bump would be occurred by a mine seismic.The bump prevention measures of a mine pressure relea-sing and driving simultaneously and mainly with a large diameter borehole for the pressure releasing during the gateway driving period and the bump prevention measures with several high density pressure releasing in the coal pillars during the mining period of the coal mining face were provided.The coal dust monitoring and measuring,micro-seismic monitoring and other methods were applied to comprehensively monitor the mine pressure bump in order to reduce the danger of the mine pressure bump.%为解决深部巨厚砾岩层下高应力煤柱附近工作面冲击地压防治问题，以华丰煤矿2410工作面和2409工作面遗留煤柱为研究对象，从采掘布置、原岩应力和采动应力等方面分析其对诱发冲击地压的影响。结果表明：2410工作面过2409煤柱期间冲击危险性较高，局部具有高冲击危险性，该条件下的冲击地压主因以遗留煤柱或区段煤柱周围形成的高应力冲击地压为主，同时伴随着煤柱失稳或采动引发巨厚砾岩层运动产生矿震诱发冲击地压。据此提出在掘进期间采用煤层大直径钻孔卸压为主的边卸压边掘进的防冲措施和工作面回采期间煤柱多轮大幅度卸压的防冲措施，与此同时采用煤粉监测、微震监测等方法进行冲击地压综合监测，从而降低了冲击地压危险性。