ABSTRACT
For increasing mining recovery ratio in caving mining the size distribution of breaking top coal is very important. The breakage of top coal is caused under the pressure of support and roof. Even though it is impossible to measure coal size distribution on site we can theoretically estimate the breakage situation of the top coal by means of the knowledge of mechanism of top coal and the pressure of support. Therefore an indirect method, fuzzy signal processing of support pressure, is proposed to estimate the breakage situation of top coal in caving mining.
