End ore-drawing caving mining technology with steel concrete composite man-made false roofs

Abstract

The invention relates to an end ore-drawing caving mining technology with high efficient using steel concrete composite man-made false roofs, characterized in that: in the stoping process of the end ore-drawing caving mining technology, with the stoping of the working face, waste-ore hopper control points at the ends of all stoping drifts continuously pave the man-made false roofs, the waste-ore hopper control points are arranged right above the stoping drifts, all stoping drifts which are provided with steel concrete composite man-made false roofs directly above the stoping drifts are subject to drilling, blasting and drawing under the shadow of man-made false roofs; the waste-ore hopper control point is an area which is located at the boundary between overlaying rock right above the draw holes and the caved ore and has the same width with the draw holes, and a man-made false roof comprises a structural steel support of the bottom layer of the bottom, a rhombic reinforcement mat of the top layer, and a concrete casting layer. According to the invention, caved ores can be separated from the overlaying rocks which are arranged in the top central area, the formation of the waste ore hopper is effectively prevented when ore drawing, thus the impoverishment and loss of ores obtained by the end ore-drawing caving mining technology is reduced, and the highly efficient end ore-drawing caving mining is realized.

Description

technical field [0001] The invention belongs to the technical field of underground mining methods, and in particular relates to an end-drawing caving method mining technology using a steel-concrete structure artificial false roof. Background technique [0002] Underground mining methods include three basic processes of mining, cutting and back mining. According to the ground pressure maintenance method, they are divided into three categories: open-field mining method, filling method and caving mining method. The method of filling the goaf to control and manage the ground pressure, the end-drawing caving mining method is more typical of the segmented caving method with or without pillars and the segmented caving method with pillars, which have high mining intensity and high degree of mechanization. Medium-sized underground mines are the most widely used. The end-drawing caving mining method is to draw the ore under the overburden rock stratum. The pure ore is released at the...

AI Technical Summary

Problems solved by technology

The roof laying process is complicated and the work efficiency is low. The analysis in the paper often leaks the steel wire rope net, and the test results are not ideal

[0006] Patent CN97116285.9 "Underground Thick and Rich Ore Body Rope Net Isolation Method without Deficiency Mining Technology" is the first mining layer without bottom pillars, drilling rope holes in the inter-pillars between the access routes, and passing through them with ropes (tendons) These holes are connected with net ropes in the approach, and the intersections are reinforced and connected to form one or more isolation nets that isolate the upper rock mass from the lower thick ore body. The mining and recovery process is carried out in the thick and rich ore body. This method is quite complicated to recover the ore body in the middle column of the network, and with the deepening of mining, the isolation network is prone to breakage and leakage

[0007] The artificial false roof used in the current caving method is a method of fully laying a false roof between the covering rock layer and the ore to isolate the covering layer from the caving ore. The construction is complicated and the material consumption is too large.

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