摘要
Abstract
In order to explore the influence of different mining-caving ratios on the mine pressure law of fully-mechanized thick coal seam working face,the 1303 working face of Zhaoxian Coal Mine in Shaanxi Province was taken as the research object.Through numerical model and on-site microseismic monitoring means,the influential range of advanced support pres-sure of roadway roof,the distribution characteristics of shallow-deep vertical stress of roof,the deformation speed of roadway surrounding rock,and the occurrence law of microseismic times under the influence of different mining-caving ratios were analyzed.The results show that the mining-caving ratio significantly affects the vertical stress distribution of the roof.When the mining-caving ratio exceeds 1∶3,the peak stress of deep roof increases by about 3 MPa,and the stress fluctuation is ab-normal.Different mining height ratios only lead to differences in the deformation speed of the roadway,but the deformation speed of the roadway shows that the right side of the roadway＞roof＞left side;with the increase of mining height ratio,the distribution range of advanced abutment pressure and the number of micro-earthquakes in front of the working face is in-creased.However,the difference between the two is insignificant,which can meet the safety production.关键词
综放工作面/采放比/数值模拟/微震Key words
fully mechanized caving face/mining and caving ratio/numerical simulation/microseismic分类
矿业与冶金
