Damage to the support system by relief blasting in deep rock burst roadways
To ensure the safe and efficient production of the rock burst mine,the anchor cable support and borehole blasting were adopted to ensure the safety and stability of the wall rocks of roadways.Based on the conditions in the 402102 working face of Hujiahe Mine,the anchoring force,working resistance and damage of wall rock structures were analyzed by field tests.The results show that the failure of anchoring force has little relation with the relative location of the pressure relief hole,and the pre-tightening force before and after relief blasting has the same loss,typically 40%～50%.The working resistance of the cable is basically stable,101.6 kN and 99.4 kN,respectively,but it has a certain influence on the structural integrity of the surrounding rocks,and there is a connection between the structural deterioration area and the blasting pressure relief hole,which provides a reference for the optimization of pressure relief of subsequent blasting.
rock burststress reliefanchoring forceworking resistance of anchor cablewall rock structure
NETL
NSTL
万方数据
