
Mining Safety of Longwall Topcoal Caving in China
2Zhangji Coal Mine, Xuzhou Mining Bureau, Xuzhou , Jiangsu Province, PR of China ABSTRACT Longwall topcoal caving technology has developed rapidly in China, in recent years The application of longwall topcoal caving can double both the productivity and the efficiency of a working face and reduce the cost of production by 30 to 40o/o

Longwall Top Coal Caving Mechanisms in the Fractured Thick
· In this study, the finite difference method (FDM) coupled with a discrete fracture network (DFN) was utilized to analyze longwall top coal caving (LTCC) behaviors The integrated FDM–DFN model enabled the influence of the preexisting fracture, stress redistribution, stress rotation, caving material compaction, and periodic rupture of roof strata to be superimposed on the failure process of

Top PDF longwall top coal caving 1Library
Coal seam II is divided into 4 slices of 9 m, 9 m, 9 m and 7 m of thickness where 4 m of the lower part of each slice will be mined out using longwall shearer and 5 m, 5 m, 5 m and 3 m top of each slice respectively will be mined simultaneously with top coal caving The first coalface is remarked as 101 The coalface 101, in which the first digits ‘1’ denoted as the first slice number and