Drawing mechanisms for top coal in longwall top coal caving (LTCC): A review of two decades of literature

This review details the state of the art in research on top coal drawing mechanisms in Longwall t op c oal c aving (LTCC) by examining the relevant literature over the last two decades. It starts with an introduction of the brief history and basic procedures of LTCC. The framework of research on the drawing mechanism, basic concepts, and some theoretical models of LTCC are detailed in sect. research framework of top coal drawing mechanism. The...