Research on the technologies of roof-cutting pressure relief and surrounding rock control in 3502 working face of Huoerxinhe Coal Mine
Huoerxinhe Coal Mine adopts the traditional mining technology of retaining coal pillars.During the mining process,the surrounding rock of the roadway is severely deformed and difficult to maintain,and the excavation work of the roadway is large,resulting in tight mining continuity.Taking 3502 working face as the engineering background,the key technology of roof-cutting pressure relief without coal pillars for roadway retaining in the working face was studied.By combining theoretical analysis with numerical simulation,the stress distribution and rock movement law of the roadway surrounding rock under different key parameters of roof cutting were studied.The results showed that the control of the roadway surrounding rock was most favorable when the roof cutting height was 14 m and the roof cutting angle was 15°.Based on on-site top cutting and weakening blasting tests and the analysis of monitoring data,it was found that the average displacements between the roof and floor and the two sides of the roadway in the top-cutting roadway retaining section were 312 mm and 128 mm,respectively,which decreased by 15％compared to the uncut section.The results indicated that top-cutting roadway retaining had a significant effect on controlling the surrounding rock of the roadway.
roof-cutting pressure reliefsurrounding rock controlgob-side entry retainingnon-pillar miningroof cutting parameters
万方数据
维普
