Filling and splicing of the downward stratified filling mining method

When the filling roof is filled with water in the horizontal layer approach, it is difficult to achieve a dense roof. In particular, shrinkage after dehydration, so often leave a gap of 0.2 to 0.5 m in the upper part of the filling. In order to solve this problem, the following measures are taken:

(1) Change the horizontal top plate to the inclined top plate, and the inclination angle is 5°~12°, so that the filling material is self-flowing and topping;

(2) Hang the plastic filling pipe close to the top plate, use the mortar pressure to fill the space as much as possible. When the distance is long, it can be carried out in sections, and a filling wall is built every 25~30m. After the entire road is filled, the filling pipe is quickly cut off outside the wall. This method requires high filling slurry concentration and good fluidity.

(3) Pressurizing and filling with a pressure pump, it is necessary to construct a retaining wall with good sealing and solid reinforcement, and install a filling pipe at a high place, and then pressurize the filling after the general filling is completed. China has developed a UBY-10/35 hydraulic mortar pump with a working pressure of 3.5 MPa and a production capacity of 3 to 10 m ³ /h.

Filled with wind-filling machines, the mines in the Federal Republic of Germany, France and other countries are very successful, especially the downward stratified filling method, which can achieve the purpose of tightly packed and less polluted filling body, but the filling power is higher. .