Study On Mining Failure And Characteristics Of Coal Seam Floor In Deep Working Face

To this day,the jiulong mine has four working face is located in the wild green coal seam.Each face is not the same with big or small water gushing water inrush.This paper in Jiulong,fengfeng group mine number 15445 wild green working face of coal seam as the research object,the working face buried depth of 850 m,belong to the big mining deep coal face.According to Kowloon mining hydrogeological data and mining wild green working face of coal seam on the surface of the work experience before,from theoretical analysis,the numerical simulation of the field use borehole water injection method measurement process of research methods,the possible causes number 15445 face inrush of theory analysis,and the damage depth and the characteristics of the analog backplane prediction and field measurement,and get the following results:(1)Floor damage has many reasons,including the back pressure,the backplane collocation of lithology and geological structure factors such as joint fissures,and working face mining technology and mining engineering factors,these factors together,soft are inrush reason to consider.(2)Using numerical simulation technology,in the process of working face mining floor stress in different depth and bottom plastic deformation range and characteristic has carried on the simulation study.Get the maximum stress appears near the working face mining to 90 m on either side of the floor rocks below coal pillar,the face slab destruction maximum damage depth of 32 m.(3)Through the experiment measured the distance of mining impact on monitoring began about 66 m,monitoring the lighter the farther the distance,Damage location is located in the largest coal face in front of the 5 m,before and after the mining influence scope to face 20 to 55 m range,damage depth monitoring the measured maximum slab is 34 m.