Application of Hydraulic Fracturing Technology in Tongkuangyu Mine
The natural caving method is used in the mining of Tongkuangyu Mine.The problems of high rate and slow rate of natural caving block in the mining process have been restricting the mining effi-ciency and safety management.In order to solve the above problems,the hydraulic fracturing rock pretreat-ment technology is introduced for the first time in Tongkuangyu Mine,and pre-treatment measures are tak-en to the first mining area in the middle section of 410 m to accelerate the expansion and extension of prima-ry cracks in the rock mass and the continuous development of secondary cracks,so as to reduce the integrity of the rock mass,and thus achieve the purpose of reducing the generation of large blocks and accelerating the continuous collapse rate.Comparing with the non-hydraulic fracturing area in the middle section of 410 m and the first mining area in the middle section of 530 m,the bulk rate,collapse area and stope sustained collapse velocity in the first mining area in the middle section of 410 m with hydraulic fracturing have signifi-cant changes,that is,the bulk rate decreases from 35.1%to 14.4%,and the initial collapse area decreases from 5 200 m2 to 2 120 m2.The continuous collapse area decreases from 5 900 m2 to 2 710 m2,the continu-ous collapse speed of the stope increased from 0.15 m/d to 0.587 m/d,and the positive effect of hydraulic fracturing is significant,which provides technical support for the follow-up midsection connection and en-sured the long-term stability of mine production and operation.
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