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CN-121345533-B - Mining method for deep high-bearing ultra-large inter-tray ore pillar in two-way combined pressure relief stage

CN121345533BCN 121345533 BCN121345533 BCN 121345533BCN-121345533-B

Abstract

The application discloses a mining method of a deep high-bearing oversized inter-tray pillar in a bidirectional combined pressure relief stage, which belongs to the technical field of mining engineering and comprises the steps of respectively constructing two pressure relief rock drilling tunnels at the positions, close to the boundaries of an upper tray and a lower tray, of the top of the inter-tray pillar in the stage, constructing a horizontal long drilling hole penetrating through the width of the pillar from one pressure relief rock drilling tunnel to the other pressure relief rock drilling tunnel to form a top pressure relief hole, constructing a cutting raise at a preset position of a mining initial end of the pillar, taking the cutting raise as a free surface, sequentially blasting to form a vertical cutting groove, tunneling a transverse tunnel at one side of the lower tray of the pillar, enabling the transverse tunnel to be communicated with the two pressure relief rock drilling tunnels at the upper portion, constructing a large-diameter parallel deep hole in the transverse tunnel, blasting to form a pressure relief space, enabling the horizontal stress of the pillar to be controllable in a bidirectional manner through the horizontal bidirectional pressure relief combined with the long drilling hole at the top, providing a safety condition for the mining operation, further realizing continuous regulation and control of the ground pressure, and guaranteeing the overall stability of the mining field.

Inventors

  • LIN WEIXING
  • WANG SHENGJIAN
  • LU JINTAO
  • SUN JIAN
  • WAN XIAOHENG
  • Ju Yuepeng
  • FU YUFENG
  • CHEN CHAO
  • Liang Juli
  • GONG YONGCHAO
  • ZHANG MINGSHUAI
  • XIONG XIAOCHEN
  • ZHANG QINGSONG
  • OU RENZE
  • LIU QI

Assignees

  • 长沙矿山研究院有限责任公司
  • 五矿矿业控股有限公司
  • 鞍山五矿陈台沟矿业有限公司

Dates

Publication Date
20260508
Application Date
20251216

Claims (8)

  1. 1. The mining method of the deep high-bearing ultra-large inter-tray ore pillar in the bidirectional combined pressure relief stage is characterized by comprising the following steps of: arranging a sampling engineering; Respectively constructing two pressure relief rock drilling tunnels communicated with the upper disc and the lower disc at the positions, close to the boundaries of the upper disc and the lower disc, of the tops of the ore pillars among the stages, wherein the two pressure relief rock drilling tunnels are arranged at the boundaries of the ore pillars; constructing a horizontal long drilling hole penetrating through the width of the ore pillar from one pressure relief drilling roadway to the other pressure relief drilling roadway to form a top pressure relief hole; constructing a cutting patio at a preset position of a mining initial end of a pillar, sequentially blasting to form a cutting groove in a vertical direction by taking the cutting patio as a free surface; tunneling a cross roadway on one side of the lower disc of the ore pillar, and enabling the cross roadway to be communicated with two pressure relief rock drilling roadways on the upper part; Constructing a large-diameter parallel deep hole in the cross roadway, and blasting to form a pressure relief space; dividing a mining field of the ore pillar according to the reserved length of the ore pillar, taking a cutting groove as a compensation space, and stoping from an upper disc to a lower disc, wherein the mining field comprises the steps of constructing a downward fan-shaped large-diameter deep hole from a top pressure relief rock drilling roadway, constructing an upward fan-shaped medium-length hole from an ore receiving roadway, and blasting stoping from the upper disc to the lower disc; After the stope of the single stope is finished, a filling retaining wall is constructed, a goaf is filled, and after the filling body reaches the preset strength, stoping is carried out on the adjacent stope until the stope of the whole inter-plate ore pillar is finished.
  2. 2. The mining method of the bidirectional combined pressure relief stage of the ore pillar among deep high-bearing oversized discs according to claim 1, wherein in the blasting stoping from the upper disc to the lower disc, the blasting stoping mode is row-by-row blasting, and the row-by-row blasting is initiated for 3-5 rows once.
  3. 3. The deep high-load ultra-large inter-tray pillar bi-directional combined pressure relief stage mining method according to claim 1, wherein arranging the mining standard engineering comprises: and constructing an ore receiving roadway, an ore discharging roadway and an ore discharging route communicated with the ore receiving roadway and the ore discharging roadway at the bottom of the ore pillar among the trays at the stage to be extracted to form a bottom ore discharging system.
  4. 4. The method of mining in a bi-directional combined pressure relief phase of a deep high load-bearing extra large inter-tray pillar according to claim 1, wherein after blasting to form a pressure relief space in the parallel deep holes of large diameter under construction in the crossroad, the method further comprises: and after the ores in the pressure relief space are completely discharged, constructing an arch reinforced concrete retaining wall in the pressure relief space immediately.
  5. 5. The method of mining a deep high load-bearing extra large inter-tray pillar bi-directional combined pressure relief stage according to claim 4, wherein the width of the concrete retaining wall is 0.5 meters.
  6. 6. The method of mining in a bi-directional combined pressure relief phase of deep high load-bearing extra large inter-tray pillars according to claim 1, wherein blasting is performed to large diameter parallel deep holes under construction in the crossroad to form a pressure relief space, and uncoupled charge blasting is used for the downward large diameter parallel deep holes.
  7. 7. The method of mining a deep high load-bearing oversized inter-tray pillar bi-directional combined pressure relief stage according to claim 1, wherein the pillar stope is divided to a stope length of 50-60 meters, the stope width being consistent with the pillar width.
  8. 8. The mining method of the bidirectional combined pressure relief stage of the deep high-bearing oversized inter-tray ore pillar according to claim 1, wherein in the step of mining by the stope from the top tray to the bottom tray by dividing the ore pillar stope according to the reserved length of the ore pillar and taking a cutting groove as a compensation space, peach-shaped ore pillars are reserved at the bottom of the stope in the stope.

Description

Mining method for deep high-bearing ultra-large inter-tray ore pillar in two-way combined pressure relief stage Technical Field The application belongs to the technical field of mine engineering, and particularly relates to a mining method for a bidirectional combined pressure relief stage of a deep high-bearing extra-large inter-tray pillar. Background As mining resources continue to evolve deeper, the mining environment generally exhibits high ground stress characteristics. To maintain stope stability, control ground pressure, and prevent post-mining surface subsidence, conventional mining methods typically employ structural designs that leave large-scale disc-section columns. The inter-tray ore pillars serve as key structures for dividing production operation units, and basic conditions are provided for orderly stoping and production organization of stopes in the tray area. Meanwhile, the ore pillar effectively guarantees stope stability and ground pressure control during the recovery of the disc zone through transferring and bearing the huge pressure of the overlying strata. To maintain its load-bearing function, the inter-tray pillars are often designed to be oversized, resulting in a significant amount of mineral resources being retained therein. Along with the gradual stoping of stopes in the disc area, stoping of the inter-disc ore pillars becomes a necessary link for improving the recovery rate of resources. During the recovery process of the coiled section, the ore pillar has passively accumulated high stress, and a large amount of elastic strain energy is accumulated inside, so that the ore pillar is converted into a high-energy dangerous body from a bearing structure. In this state, the ore pillar is directly recovered, the original stress balance is broken, the stress state of surrounding rock is rapidly adjusted, dynamic disasters such as rock burst and rock burst are extremely easy to induce, the safety of personnel equipment is seriously threatened, and the smooth recovery of ore pillar resources is restricted. Disclosure of Invention In view of the technical problems in the background art, the application provides a mining method for a bidirectional combined pressure relief stage of a deep high-bearing oversized inter-tray pillar, which comprises the following steps: arranging a sampling engineering; respectively constructing two pressure relief rock drilling tunnels at the positions of the tops of the ore pillars among the stage trays, which are close to the boundaries of the upper tray and the lower tray; constructing a horizontal long drilling hole penetrating through the width of the ore pillar from one pressure relief drilling roadway to the other pressure relief drilling roadway to form a top pressure relief hole; constructing a cutting patio at a preset position of a mining initial end of a pillar, sequentially blasting to form a cutting groove in a vertical direction by taking the cutting patio as a free surface; tunneling a cross roadway on one side of the lower disc of the ore pillar, and enabling the cross roadway to be communicated with two pressure relief rock drilling roadways on the upper part; Constructing a large-diameter parallel deep hole in the cross roadway, and blasting to form a pressure relief space; Dividing mining fields of the ore pillars according to the reserved length of the ore pillars, taking a cutting groove as a compensation space, and stoping from the upper disc to the lower disc one by one; After the stope of the single stope is finished, a filling retaining wall is constructed, a goaf is filled, and after the filling body reaches the preset strength, stoping is carried out on the adjacent stope until the stope of the whole inter-plate ore pillar is finished. In some embodiments, in dividing a pillar stope according to a pillar reserving length, taking a cutting groove as a compensation space, stoping from a top plate to a bottom plate in a stope-by-stope manner comprises: Constructing upward sector medium-length holes from the mine receiving roadway; blasting stoping is carried out from the upper disc to the lower disc. In some embodiments, after constructing upward sector-shaped medium-length holes from the mine-receiving roadway and before blasting recovery, the method further comprises: and constructing a sector-shaped large-diameter deep hole downwards from the top pressure relief rock drilling tunnel. In some embodiments, in the blasting stoping from the top disc to the bottom disc, the blasting stoping mode is row-by-row blasting, and the row-by-row blasting is initiated for 3-5 rows at a time. In some embodiments, the placement admission engineering comprises: and constructing an ore receiving roadway, an ore discharging roadway and an ore discharging route communicated with the ore receiving roadway and the ore discharging roadway at the bottom of the ore pillar among the trays at the stage to be extracted to form a bottom ore discharging system.