A mining method of downward cementing and filling without top pillar in combined section and stope

Abstract

A mining method for downward cementing and filling without top pillars in combined sections and stopes: the stope layout is divided into two side-by-side stopes according to the middle section; in the quasi-cutting project, the raised shaft is directly connected to the two middle sections of the well at one time , a raised well controls the left and right stopes; the cutting roadway lowers the height of the filling body by one layer compared with the conveying vein roadway, and eliminates the original top pillar; the mining process adopts the approach type downward mining, and the mining operation is in the upper layer of filling Under the body, it is supported by anchor nets on the upper wall; the ventilation support project uses the ventilation shaft along the road to return air, and the pipe-slit anchor rod combined with steel mesh is used to support the upper wall; the filling project reserves pedestrian wells along the road, along the road Ventilation shafts, end-side shafts; the mining method of the present invention has the advantages of low dilution loss rate, simple construction technology, small construction work volume, good ventilation in the stope, high safety, and low mining cost, and is suitable for weak, broken, and steep slopes. Thin vein mining offers an excellent solution.

Description

technical field [0001] The invention relates to the technical field of weak, broken, and sharply inclined thin vein mining, and in particular to a mining method for downward cementing and filling without top pillars in combined sections and combined stopes. Background technique [0002] In the mining of weak, broken and sharply inclined thin veins, the downward approach cemented filling mining method is usually adopted. In the construction of raised shafts in the veins, the dislocation arrangement is generally adopted, that is, when the raised shafts are arranged in the upper and middle sections of the same ore body, the upper and lower openings are dislocated by 3~ 5m, 40 meters apart in the same mid-section of the patio, and each patio controls 20 meters of stopes on the left and right sides; in order to ensure the safety of the first layer of mining and the stability of the mining project, a top column must be reserved, and this part of the resource needs to be in the mini...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies in the background technology, the present invention discloses a mining method for downward cementing and filling without top pillars in combined stopes: the stope layout is divided into two side-by-side stopes according to the middle section; , the raised well in the vein uses a raise drilling rig to go directly to the two middle sections of the well at one time, which has high construction efficiency, reduces the number of raised wells, and reduces the amount of raised well construction; the two-way control of the raised well has a long working surface, a large amount of single filling operation, and good continuity , the use frequency of the filling pipeline is low, the maintenance workload is small, and the service life is long; the height of the filling body is lowered by one layer in the cutting project compared with the transportation tunnel, and the original top column is eliminated, so there is no need for secondary recovery of the top column, which solves the problem The secondary recovery cost of the original top column is high and the operation safety cannot be guaranteed; its mining technology adopts the approach type downward mining, and the mining operation is always under the filling body of the previous layer, and the engineering stability along the vein is high. Cooperating with the anchor net support on the upper wall, mechanical transportation can be used to improve the efficiency of ore extraction; and the supporting ventilation shafts and pedestrian shafts are well maintained to ensure the ventilation safety of the mining operation face and the evacuation safety of mining operators in case of accidents; For the ventilation support project, the ventilation shaft along the road is used to return air, and the return air passage can be guaranteed to be unblocked at all times; The network has the advantage of making the combination of the filling body and the excavation roadway more firm; its filling engineering reserves the pedestrian wells, the ventilation wells, and the end wells

Images