CN-122014256-A - Crushed ore body stoping method

Abstract

The invention discloses a crushed ore body stoping method, relates to the technical field of mineral exploitation, and aims to improve safety and efficiency of crushed ore body exploitation. The method comprises the steps of firstly, obtaining the trend, dip angle, thickness and rock integrity coefficient Kv of an ore body by combining three-dimensional seismic exploration with borehole CT scanning, dividing independent mining units according to the trend, setting safety isolation ore pillars, dividing weak, medium and strong crushing subareas according to Kv values, secondly, constructing prestressed anchor cables along the trend of the ore body to form a main bearing frame, arranging blast holes in parallel with the trend of the ore body, adjusting the loading capacity according to the crushing degree, detonating the ore body in a segmented manner, mechanically sawing and falling the ore body of the thin ore body, finally, arranging three-dimensional laser scanning monitoring points, filling tailings after the strong crushing area is mined out, and triggering surrounding rock to naturally collapse after the medium and weak crushing area is mined out and temporarily reserved for the adjacent units to be mined out. The method realizes differential exploitation and support, ensures safety and improves resource utilization rate.

Inventors

• XIANG YU
• MA JIAHUI
• LUO YEMIN
• HUANG BAOXIAN
• ZHANG ZHONGJIE
• HUANG RUI
• MA XINJUN

Assignees

• 安徽金日晟矿业有限责任公司

Dates

Publication Date

20260512

Application Date

20251114

Claims (6)

1. 1. A method of crushed ore body recovery comprising the steps of: The method comprises the steps of 1, adopting a three-dimensional seismic exploration technology and combining borehole CT scanning to obtain trend angles, dip angles, thicknesses and rock integrity coefficients Kv of each ore body, dividing an area to be mined into a plurality of independent mining units by taking the trend of the ore body as a core classification basis, and setting independent safety isolation ore pillars; Constructing prestressed anchor cables along the trend of ore bodies of each mining unit to form a main bearing frame, wherein a weak crushing subarea adopts an anchor rod and guniting support, a medium crushing subarea adopts an anchor rod, a metal net and guniting support, and a strong crushing subarea adopts a pipe shed, grouting and anchor rod combined support; Step 3, arranging a blast hole in parallel with the direction of the ore body, adjusting the explosive loading quantity according to the crushing degree of the subareas, and adopting a millisecond delay detonator to detonate in a segmented manner, wherein a thin ore body mining unit with the thickness of less than 2m adopts mechanical sawing for ore falling; And 4, arranging three-dimensional laser scanning monitoring points in each mining unit, collecting goaf displacement data in real time, immediately performing tailing cemented filling after the strongly broken subregion is mined out, temporarily retaining after the medium and weak broken subregion is mined out, and triggering surrounding rock to naturally collapse after the extraction of the adjacent mining units is completed.
2. 2. A method of crushed ore body extraction according to claim 1, wherein the deviation of the ore body orientation in each of the extraction units is not more than + -10 degrees.
3. 3. A crushed ore body extraction method according to claim 1, wherein the weak crushing (Kv > 0.6), the medium crushing (Kv≤0.3) and the strong crushing (Kv < 0.3).
4. 4. A crushed ore body extraction method according to claim 1, wherein the width of the safety isolation ore pillar in the step 1 is not less than 1.5 times of the maximum thickness of the ore body.
5. 5. The method for extracting crushed ore bodies according to claim 1, wherein the diameter of the prestressed anchor cable in the step 2 is 22-25mm, the length is 2-3 times of the thickness of the ore bodies, the pretightening force is not lower than 150kN, and the construction interval is 5-8m.
6. 6. The method for stoping crushed ore bodies according to claim 1, wherein the depth of blast holes in the step 3 is 0.8-1.0 times the thickness of the ore bodies, the hole spacing is 1.0-1.5m, the row spacing is 1.2-1.8m, the charging density of weak crushing subareas is 0.3-0.4kg/m, the charging density of medium crushing subareas is 0.2-0.3kg/m, the charging density of strong crushing subareas is 0.1-0.2kg/m, and the detonation time difference of adjacent sections is not less than 50ms.

Description

Crushed ore body stoping method Technical Field The invention relates to the technical field of mineral exploitation, in particular to a crushed ore body stoping method. Background In the field of mineral exploitation, broken ore bodies are always important points and difficulties in exploitation operation due to poor development and integrity of rock mass joint cracks, and particularly when a plurality of ore bodies with different trend and heavier breaking degree exist in an area to be exploited, the traditional stoping method faces a plurality of technical bottlenecks. In the prior art, the stoping of the crushed ore body mostly adopts a single mining strategy, and the targeted planning of the spatial distribution characteristics of the multi-strike ore body is lacking. Because of the difference of stress transmission paths of ore bodies with different trend, the traditional stope arrangement mode of 'one-cut' is easy to cause local stress concentration, thereby causing safety accidents such as roof caving, ore wall caving and the like and seriously threatening the safety of operators and equipment. Meanwhile, the traditional support system mostly adopts a full-section unified support mode, and cannot adapt to the stable requirements of areas with different crushing degrees, namely, the support system is easy to collapse when the support strength of the strong crushing area is insufficient, the material waste and the cost increase are caused when the support system is excessively supported in the weak crushing area, the support operation and the stoping operation are crossly interfered, and the mining efficiency is greatly reduced. In the ore dropping operation link, the traditional blasting mode is not combined with the ore body trend and the crushing degree to carry out differential control, the blast hole arrangement direction is not matched with the ore body trend, the loading quantity is lack of accurate regulation, the rock mass crushing is easily aggravated due to blasting vibration superposition, the ore dropping range is out of control, part of ore bodies are excessively crushed and mixed into waste stones, the ore depletion rate is high, part of corner ore bodies are abandoned due to the fact that the mining difficulty is high, and the resource loss rate exceeds 15%. In addition, in the aspect of goaf management, the traditional monitoring means depend on single-point displacement meters, so that irregular goaf universe dynamic monitoring formed by multi-trend ore body exploitation is difficult to realize, risks such as roof displacement, surrounding rock convergence and the like cannot be early warned in time, goaf treatment modes are single, and the ground pressure management difficulty is further increased. As mineral resource development extends to deep and the proportion of complex ore bodies increases year by year, the exploitation demands of broken ore bodies with a plurality of different trends are increasingly prominent. Industry is in need of a stoping method capable of realizing accurate partition, differential support and ore dropping control so as to solve the defects of the traditional technology in terms of safety guarantee, resource recovery and mining efficiency and promote the upgrading and development of the complex broken ore body mining technology. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a crushed ore body stoping method. In order to achieve the purpose, the invention provides the following technical scheme that the crushed ore body stoping method comprises the following steps: The method comprises the steps of 1, adopting a three-dimensional seismic exploration technology and combining borehole CT scanning to obtain trend angles, dip angles, thicknesses and rock integrity coefficients Kv of each ore body, dividing an area to be mined into a plurality of independent mining units by taking the trend of the ore body as a core classification basis, and setting independent safety isolation ore pillars; Constructing prestressed anchor cables along the trend of ore bodies of each mining unit to form a main bearing frame, wherein a weak crushing subarea adopts an anchor rod and guniting support, a medium crushing subarea adopts an anchor rod, a metal net and guniting support, and a strong crushing subarea adopts a pipe shed, grouting and anchor rod combined support; Step 3, arranging a blast hole in parallel with the direction of the ore body, adjusting the explosive loading quantity according to the crushing degree of the subareas, and adopting a millisecond delay detonator to detonate in a segmented manner, wherein a thin ore body mining unit with the thickness of less than 2m adopts mechanical sawing for ore falling; And 4, arranging three-dimensional laser scanning monitoring points in each mining unit, collecting goaf displacement data in real time, immediately performing tailing cemented filling after the strongly broken subregi