1 Relying on the filling body to support the surrounding rock to slow the movement speed of the surrounding rock and maintain the relative stability of the surrounding rock.
2 Wrap the pillar with filling material to change the pillar from one-way compression to three-way compression, thus increasing the strength of the pillar.
3 The filling body can withstand the transfer of the support pressure of the pillar during the mining of the pillar. If the filling body has sufficient strength to prevent the continued movement of the surrounding rock, the stress concentration on the adjacent unmined pillar can be alleviated.
(2) Applicable conditions for the filling of the empty area method:
1 Surrounding rock and surface are not allowed to collapse;
2 It is required to increase the recovery rate of the pillars;
3 There are ready-made cheap filling materials available (such as open-air stripping, excavation of waste rock, tailings, smelting furnaces, etc.);
4 Other conditions that are not suitable for treating goaf with caving surrounding rock. (such as covering a very thick and extremely stable blind space, etc.);
(3) Specific methods for filling empty areas
The method of filling the empty area is dry filling, or it can be water sand, filling, tailings, and filling. Some mines use hydraulic gravel to fill the way. (Such as iron ore, Shandong Golden Ridge mouth area is called the crushing force of good water washed gravel be filled stope underground. Piped, rubble piled up in the goaf, while water discharge stope, flows through the gutter The water wheel is pumped to the surface again.)
(4) Differences between filling and filling mining methods when filling empty areas:
The former is a filling after mining, and the filling efficiency is high, while the filling mining method is to fill the side while collecting, and filling one layer after filling one layer. Therefore, the process and filling quality are also different. The quality of a filling goaf is poor. (If dry filling is used, the "dead angle" left on both sides of the goaf from the far side of the filling well. When the disc tilt angle is not steep, the upper disc is not dense.
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