Research On Law Of Rock Pressure Appearance Under The Moutain Coal Seam Mining In SanJiaohe Coal Mine

Shanxi Huozhou coal electricity group Sanjiaohe mine in the mining area terrain cutting,changeful ups and downs,a thick layer of loess covering,part of the regional coal seam buried depth is shallow,resulting in mine working face pressure behavior is the new features and changes.Through the collection of relevant literature data and field investigation,the integrated used of theoretical analysis,field observation and numerical simulation method is mountain under the condition of shallow buried deep coal seam mining behavior law of mine pressure and systematic analysis and research.Through theoretical calculation,use the key strata theory to detennine 2#seam 504 working face roof key stratum,built hillside next mining roof mechanical model,using the force method to calculate the first weighting step distance is 36.6 m,periodic weighting step distance is 14.9 m.Through the numerical simulation,the stress distribution law and the roof displacement failure law of the mining face under the condition of mountainous area are revealed,in the underground mining,the stress concentration factor of the slope is larger than that of the slope,and the ore pressure appears strongly.The maximum stress value is 6.14 MPa and the maximum stress concentration factor is 1.89;the working face first weighting is 35 m,working face cycle in mountain uphill under pressure step by 15 m gradually reduced to 10 m,and the step length increases to 15 m at the top of the mountain.Through the field test,the characteristics and laws of the mining pressure of the underground mining face are verified,and the working face of the working face is strong,and the pressure step is reduced.Theoretical calculation and numerical simulation results and the field observation results kiss with mutual authentication,based on the analysis of the mine pressure behavior characteristics,grasp the regularity of strata behavior.On the other mining work face back to the mining pressure control is of guiding significance.And for mining under the mountain terrain has important reference significance and reference value.