CALCULATION OF SUPPORT LOAD DURING CYCLIC WEIGHTING IN FULLY-MECHANIZED SUBLEVEL CAVING FACE

Based on the relationship between the support and the surrounding-rock in a fully-mechanized sublevel caving face, a model for calculating the support load during cyclic weighting is built, and the formula for calculating impact load on the support during cyclic weighting is obtained based on the principle of the three-hinged arch balance. The model and the formula are applied to the no.1306 working face, and it is shown that the impact load on the support during cyclic weighting is 7190 kN, and the support load during cyclic weighting is 13300 kN. According to the measured results, the support load during cyclic weighting is 13110 kN. The effectiveness of the model for calculating the support load during cyclic weighting in the fully-mechanized sublevel caving face is thus verified. The method can be used for the support selection and the support load calculation during cyclic weighting in the fully-mechanized sublevel caving face.