EFFECT OF BLASTING IN OPEN-PIT ON STABILITY OF SURROUNDING ROCK OF UNDERGROUND STOPES IN TONGLUSHAN MINE

The Tonglushan Copper Mins operated by surface and underground mining simultaneously uses the instantaneous recorders controlled by microcomputer to measure the effect of the seismic waves from open-pit blasting on underground stopes and their weakening regularities. Through the measuring and analying, the parameters such as permissible explosive amount for single-stage blasting, criticalvibration velocity, and safety distance can be gotten.