CN-121363426-B - Construction method of distributed rigid-flexible coupling bottom structure

CN121363426BCN 121363426 BCN121363426 BCN 121363426BCN-121363426-B

Abstract

The application discloses a construction method of a distributed rigid-flexible coupling bottom structure, which belongs to the technical field of mine engineering, and aims to solve the problems of maximum main stress concentration and accumulated conduction of blasting vibration by actively cutting off a rock mass stress transmission path through a pre-splitting space and dividing a continuous bottom structure into independent units, and on the other hand, the method comprises the steps of step-by-step stoping, combining with peach-shaped ore pillar forming, combining with a filler formed by double retaining walls, forming a rigid ore pillar bearing structure, combining with flexible interval unloading of the pre-splitting space, forming a rigid-flexible coupling system, not only resisting structural deformation caused by filler settlement, but also avoiding local damage, interlocking diffusion, and aiming at solving the problems of easy disturbance and easy interruption of production of a very large-scale dish bottom structure in the traditional method.

Inventors

CHEN CHAO
HU LIKE
WU YAOQIAN
SUN ERWEI
GUO MIN
FU YUFENG
SONG LIANG
LIN WEIXING
LUO WENCHONG
Liang Juli
GONG YONGCHAO
Kong Kewei
ZHANG QINGSONG
LIU QI
LU JINTAO

Assignees

长沙矿山研究院有限责任公司
五矿矿业控股有限公司

Dates

Publication Date: 20260512
Application Date: 20251216

Claims (9)

1. A method for constructing a distributed rigid-flexible coupled bottom structure, comprising: Arranging a mining engineering in the bottom structure of the ultra-large scale disc area; in the bottom structure of the ultra-large scale disc zone, pre-splitting blast holes are arranged at intervals along the trend of the body to be mined; The pre-splitting blast holes are arranged along the extending direction of the ore drawing lane of the bottom structure, and a buffer layer is reserved between the bottom of each pre-splitting blast hole and the boundary of the bottom structure, wherein the buffer layer is used for avoiding damage to the main body of the bottom structure caused by pre-splitting blasting so as to accurately control the blasting influence range; performing presplitting blasting to form presplitting space which is positioned in the peach-shaped ore pillars, wherein the two peach-shaped ore pillars containing the presplitting space are not adjacent; Stoping a stope, and forming an inclined plane at one side of a peach-shaped ore pillar in an ore body in a manner of constructing inclined holes and blasting; Constructing an arch-shaped filling retaining wall at an originally formed pre-splitting space in a peach-shaped ore pillar ore-drawing roadway, arranging an additional retaining wall at an intersection section of an ore-receiving roadway of a first-step stope and a second-step stope, and filling a goaf of the first-step stope; After the filling body of the stope of the first step reaches the design strength and is fully consolidated, carrying out stope stoping operation of the second step, and forming an inclined plane on the other side of the peach-shaped ore pillar in a manner of constructing inclined holes and blasting, thereby forming the peach-shaped ore pillar.
2. The method for constructing the distributed rigid-flexible coupling bottom structure according to claim 1, wherein the accurate mining engineering comprises sequentially constructing a mine receiving lane, a mine discharging lane and a mine discharging access on the basis of a middle-section upper disc pulse-following conveying lane, a lower disc pulse-following conveying lane and a disc zone pulse-passing lane so as to form a complete disc zone bottom structure engineering system.
3. The method for constructing the distributed rigid-flexible coupling bottom structure according to claim 2, wherein the section sizes of the ore receiving lane, the ore discharging lane and the ore discharging inlet are required to meet the ore discharging and ventilation requirements, and an operation space is provided for the subsequent pre-splitting blasting operation.
4. The method of constructing a distributed rigid-flexible coupled bottom structure according to claim 1, wherein the pre-split blasting employs an interlaced uncoupled charge structure.
5. The method for constructing the distributed rigid-flexible coupling bottom structure according to claim 1, wherein during stoping of a stope in one step, upward sector medium-deep holes are constructed in a rock drilling lane at the upper part of the stope and a bottom ore receiving lane, and inclined short blast holes are constructed at the position, adjacent to the stope boundary, of the ore receiving lane, and the inclined short blast holes are used for forming ore dropping grooves so as to improve ore fluidity and ore extraction efficiency.
6. The method for constructing the distributed rigid-flexible coupling bottom structure according to claim 4, wherein the blasting of the stope mining in one step adopts a medium-length hole row-by-row differential detonation mode.
7. The method for constructing the distributed rigid-flexible coupling bottom structure according to claim 6, wherein a preset number of rows of blastholes are initiated each time, the blastholes in the rows are initiated in at least two sections sequentially according to micro-delay, and delay blasting is adopted between the rows.
8. The method of constructing a distributed rigid-flexible coupled bottom structure according to claim 1, wherein an additional retaining wall is provided at a junction section of a mine receiving roadway of a first-step stope and a second-step stope while constructing an arch-shaped filling retaining wall.
9. The method for constructing the distributed rigid-flexible coupling bottom structure according to claim 1, wherein the arrangement logic of the upward sector-shaped medium deep hole and the inclined short blast hole for forming the ore dropping groove is consistent with that of the one-step stope during stoping of the two-step stope, and the construction direction of the inclined hole is matched with that of the inclined hole for forming the inclined plane of the one side of the peach-shaped ore pillar in the one-step stope during forming the inclined plane of the other side of the peach-shaped ore pillar by constructing the inclined hole.

Description

Construction method of distributed rigid-flexible coupling bottom structure Technical Field The invention belongs to the technical field of mine engineering, and particularly relates to a construction method of a distributed rigid-flexible coupling bottom structure. Background In recent years, with the development of deep mineral resources, the number of mining mines of ultra-large thick and large ore bodies is continuously increased, the basic construction and production scale of the mines are synchronously enlarged, and the mining tray area of the mines often breaks through 200 m by combining with the occurrence condition of the ore bodies, so that ultra-large mining units are formed. In such a coil mining, the tunnel engineering of the bottom structure needs to be constructed in advance before the stoping operation, and continuously bears double core loads in the whole mining period, so that the structure is unstable and the production efficiency is affected due to the fact that the tunnel engineering is easily disturbed in the production process. Disclosure of Invention In view of the technical problems existing in the background art, the application provides a method for constructing a distributed rigid-flexible coupling bottom structure, which comprises the following steps: Arranging a mining engineering in the bottom structure of the ultra-large scale disc area; in the bottom structure of the ultra-large scale disc zone, pre-splitting blast holes are arranged at intervals along the trend of the body to be mined; performing presplitting blasting to form presplitting space which is positioned in the peach-shaped ore pillars, wherein the two peach-shaped ore pillars containing the presplitting space are not adjacent; Stoping a stope, and forming an inclined plane at one side of a peach-shaped ore pillar in an ore body in a manner of constructing inclined holes and blasting; Constructing an arch-shaped filling retaining wall at an originally formed pre-splitting space in a peach-shaped ore pillar ore-drawing roadway, arranging an additional retaining wall at an intersection section of an ore-receiving roadway of a first-step stope and a second-step stope, and filling a goaf of the first-step stope; After the filling body of the stope of the first step reaches the design strength and is fully consolidated, carrying out stope stoping operation of the second step, and forming an inclined plane on the other side of the peach-shaped ore pillar in a manner of constructing inclined holes and blasting, thereby forming the peach-shaped ore pillar. In some embodiments, the mining standard engineering comprises sequentially constructing a mine receiving lane, a mine discharging lane and a mine discharging access based on development engineering such as a middle section upper disc vein-following transportation lane, a lower disc vein-following transportation lane, a disc region vein-passing lane and the like so as to form a complete disc region bottom structure engineering system. In some embodiments, the cross-sectional dimensions of the receiving roadway, the drawing roadway and the drawing access are required to meet the drawing and ventilation requirements, and provide an operation space for the subsequent pre-splitting blasting operation. In some embodiments, the pre-splitting blast holes are arranged along the extending direction of the ore drawing lane of the bottom structure, and a buffer layer is reserved between the hole bottom of the pre-splitting blast holes and the boundary of the bottom structure, wherein the buffer layer is used for avoiding damage to the main body of the bottom structure caused by pre-splitting blasting so as to accurately control the blasting influence range. In some embodiments, the pre-split blasting employs an interlaced uncoupled charge configuration. In some embodiments, during stoping of a stope, upward sector medium-length holes are constructed in a rock drilling lane at the upper part of the stope and a mining receiving lane at the bottom, and inclined short blast holes are constructed at the position, adjacent to the stope boundary, of the mining receiving lane, and are used for forming ore dropping grooves so as to improve the fluidity and the ore extraction efficiency of ores. In some embodiments, the blasting of the one-step stope adopts a medium-length hole row-by-row differential blasting method. In some embodiments, a predetermined number of rows of blastholes are blasted each time, the blastholes in a row are blasted in sequence in at least two sections with a slight delay, and delayed blasting is employed between the rows. In some embodiments, additional retaining walls are provided at the junction sections of the mine receiving roadway of the primary stope and the secondary stope while the arch-shaped filled retaining wall is being constructed. In some embodiments, the arrangement logic of the constructed upward sector medium-length hole and the inclined short blas