NON-COAL-PILLAR GOB-SIDE ENTRY RETAINING METHOD HAVING FILLING-WALL SELF-ELIMINATION

摘要

A non-coal-pillar gob-side entry retaining method having filling-wall self-elimination comprises the following steps: during the exploitation of an upper-section coalface (1), pumping a high-water material into a flexible mold bag (3) along the edge of a goaf (2), forming a roadside filling-wall (4) by construction, and disposing a breather pipe (6) in the filling-wall in advance; and during the exploitation of a lower-section coalface (7), cutting the flexible mold bag (3) behind the coalface, and injecting carbon dioxide into the breather pipe after the exploitation is completed, so that a carbonization reaction occurs on the filling-wall, and the filling-wall is broken and decomposed, so that the self-elimination of the roadside wall is achieved. In the method, during the gob-side entry retaining service period, the high-supporting performance of a high-water material roadside wall is fully come into play; the self-elimination of the filling-wall can be achieved after the gob-side entry retention is abandoned, accordingly the stress concentration generated by the leftover of the filling-wall is prevented, the effect of full pressure relief on upper and lower adjacent coal beds is achieved, and the method has a positive effect on mining space maintenance, gas extraction and dynamic disaster prevention and control.