Abstract: The key of using super high water material open backfilling technology is to maintain the integrity of the roof. The filling face can be simplified into five kinds of boundary support elastic plate. They are: four edges clamped board, three edges clamped side of the simply supported plate, two sides clamped on both sides of the simply supported plate, one side clamped and trilateral simply-supported plate and plate with four simply supported edges. Furthermore, based on the principle of virtual work, the elastic foundation plate and the expression of elastic plate deflection and bending moment when four edges are affected by the horizontal pressure effect are deduced, and the relationship between plate maximum bending moment and forward distance are analyzed. Thus, the model provides the theoretical evidences for the mining width of super high water material open backfilling mining working face and the layout mode of working face. According to the analysis of field measured data, the correctness and reliability of the model can be verified.

Key words: super high water material, virtual work principal, elastic plate, open backfilling