摘要
针对高突低透矿井上、下保护层开采具体方案选择缺乏理论支撑的难题,基于二维颗粒流软件PFC2D建立了上、下保护层及被保护层卸压增透模型,对比分析研究了上、下保护层开采后被保护层全过程卸压趋势及孔隙率变化规律。结果表明,下保护层开采模式下煤层卸压效果更明显,裂隙网络更为发育,防突效果更佳,同一水平位置不同埋深处竖直方向下保护层开采最大卸压值约为上保护层开采的2倍、最大孔隙率约为上保护层开采的1.26倍。该研究成果有助于为保护层开采方式的合理选择。
There is lack of theoretical support when choosing mining methods between upper and lower protecting strata for coal mine with high outburst and low permeability. According to this problem,the pressure releasing and permeability improving models of the upper and lower protecting strata were established based on the PFC2 D software. Then,the pressure releasing trends and the porosity evolution characteristics of the protected coal seams were compared under the mining of upper and lower protecting strata. The results showed that under the mining mode of lower protecting stratum,the pressure releasing effect was more obvious,the fracture network was better developed,and the outburst prevention effect was more prominent. At the same level location of different buried depths,the maximum pressure releasing value for the lower mining protecting stratum was 2times of the upper mining protecting stratum,and the maximum porosity was about 1. 26 times of the upper protection layer mining. This study had provided a reasonable basis for the method selection of protecting stratum.
出处
《矿业研究与开发》
CAS
北大核心
2016年第4期11-15,共5页
Mining Research and Development
基金
四川省科技厅应用基础计划项目(2015JY0045)
关键词
保护层开采
PFC
卸压增透
瓦斯突出
Mining under protecting stratum
PFC
Pressure releasing and permeability improving
Gas outburst
