Research on the application of roof cutting and pressure relief technology by using carbon dioxide cracking in gob-side roadway
Theoretical analysis and numerical simulation methods were used to study the problem of strong pressure manifestation in hard roof of gob-side roadway,and industrial test were successfully completed.The results show that roof cutting and pressure relief technology by using carbon dioxide cracking can reduce the peak stress,the stress concentration is far away from the roadway,which can alleviate the pressure manifestation.The roof cutting height and roof cutting angle have a significant influence on the surrounding rock control of the roadway.The higher roof cutting height,the better the pressure relief effect,but when the cutting height reaches a certain level,increasing the cutting height does not have a significant effect on the stress reduction.When the roof cutting angle large,the stress on the coal pillar significantly decreases,and when the roof cutting angle small,it is more con-ducive to optimizing the stress environment near the roadway.Carbon dioxide cracking technology was applied to roof cutting and pressure relief in roadway 5015 of Majiliang Coal Mine.The roof and floor displacement,the deformation of the two sides and the peak abutment pressure were reduced by 22.6％,28.7％and 21.8％respectively,which compared with without roof cutting.Its significantly improved the stress environment of the roadway and reduces the deformation of surrounding rock,which was helpful to solve the problem of strong pressure manifestation.
gob-side roadwayhard roofcarbon dioxide crackingroof cutting and pressure reliefstrata behaviors
万方数据
维普
