Abstract: Based on the analysis of the expression of the external work in lateral coal fractured zone, plastic zone and increasing zone of elastic stress, the corresponding energy dissipation formulas have been deduced, applying the first law of thermodynamics. The damage variable which is the ratio of energy dissipation value and external forces work for surrounding rock has been determined. Consequently, conclusions have been drawn that damage variable continuously decreases from fractured zone to plastic zone, till to increasing zone of elastic stress. For energy dissipation, it is similar to damage variable. Mineral pressure observation of stagger arrangement workface in Zhenchengdi mine shows that roadway has less support pressure in fractured zone, making it easy to maintain. When loose gangue is above roadway, it will produce compression deformation and plastic deformation under the action of support pressure. Its energy dissipation is bigger, making it easier to maintain.

Key words: energy dissipation, stagger arrangement, roadway