Characteristic Analysis of the Change of the Surrounding Rock in the Roadway with Different Support Techniques
In order to achieve safe mining in coal mines,the stability of surrounding rock is controlled.For the rectangular roadway of a mine,three different support technologies are designed:ordinary anchor mesh cable,reinforced anchor mesh cable,and high-strength pre-tensioned anchor bar anchor cable support,among which,with ordinary anchor mesh cable support,the stress concentration phenomenon in the roadway gang is serious,and the top plate sinking amount is as high as 800 mm,which affects the use of the roadway;with reinforced anchor mesh cable support,the top plate sinking amount is reduced to 600 mm,which also affects the use of the roadway;and the pre-tensioned anchor bar anchor cable support,the top plate stress concentration phenomenon is serious.With the support of pre-tensioned anchor ropes,the height of roof stress concentration area is reduced from 3 m to 0.3 m,and the amount of subsidence is reduced to 129 mm,which is the optimal support technology.
anchor cable supportpre-tensioned anchor cable supportjoint support
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