Abstract:

The paper employs the universal distinct element code (UDEC) to analyse the effect of cutting-caving ratio on the distribution laws of plastic strain of the fully mechanized top coal caving face (FMTCC). The results indicate if the ratio of cutting to caving height decreases or the cutting height increases, then the plastic failure of the FMTCC suddenly increases and the plastic strain zone also expands. Consequently, the variation of cutting to caving height ratio significantly changes the stress environment around the longwall, provides convenient conditions to coal mining, and increases the stable condition of the FMTCC.