5、alsimulationexperiment,concludedtheheightlawofthe"upwardcrack"and"downwardcrack"underdifferentfilling-gapwidthandfilling-bodywidth,themovementlawofWaterResistingGroupsunderdifferentfilling-gapwidthandfilling-bodywidthwasobtained,whichprovidesthetechnicalsupportforstrip-mining. Ke