RESEARCH ON DECOUPLING CHARGE BLASTING IN FRACTURED ROCKMASS

Due to the complicated geologic condition and plenty of fractured rockmass in Wulongqian Mine of WISCO, the boulders frequency and fine productivity are high. To solve the problem, the decoupling charge blasting is introduced. First, the action of decoupling charge blasting is disscued, which improves the effect of blasting from increasing the stress wave action time, reducing the shock pressure peak value on the hole wall and augmenting the impulse to the rock. Then, the industrial test is made to validate the decoupling charg. Comparing the coupling charg with the decoupling charg, throuth the effect of blasting and the technical and economical index, the latter is better, which not only can reduces the boulders frequency and fine productivity, but also is reasonable in economy.