Study on the strength influencing law and its optimum ofdifferent gradation tailings in a mine

The gradation of tailings is one of the important factors affecting the strength of filling body.The filling quality of a mine is poor because of the smaller and smaller grinding fineness and unreasonable gradation.Therefore, taking the whole tailings of the mine as raw material, the strength ratio test of tailings filling body with different gradation is carried out and optimized.The gradation of tailings is recommended as follows:30% with +150 μm, 30% with -150~+74 μm, 20% with -74~+37 μm and 20% with -37 μm.The next step is to carry out technical transformation according to the test results, optimize tailings gradation, and realize safe and efficient mining.