阅读说明：本技术 一种中厚矿体v形顶柱分段凿岩阶段空场嗣后充填采矿法 (Open stope subsequent filling mining method for V-shaped top column subsection rock drilling stage of medium-thickness ore body ) 是由 周礼 林卫星 欧任泽 曾令义 魏威 詹进 江科 万孝衡 于 2021-08-03 设计创作，主要内容包括：本发明公布了一种中厚矿体V形顶柱分段凿岩阶段空场嗣后充填采矿法,矿块沿矿体走向布置,矿块内划分为一步骤采场和二步骤采场,先采一步骤采场并采用高强度充填体充填采空区,一步骤采场回采时形成V形顶柱以便于充填接顶,一步骤采场充填体强度达到设计指标后回采二步骤采场,二步骤采场回采完毕后采用低强度充填体充填。本发明具有采场充填接顶工艺简单、接顶质量有保证、接顶率高,能有效改善二步骤采场回采安全等优点。(The invention discloses an open stope subsequent filling mining method in a medium-thickness ore body V-shaped top pillar subsection rock drilling stage, wherein ore blocks are arranged along the trend of an ore body, the interior of each ore block is divided into a one-step stope and a two-step stope, the one-step stope is mined firstly, a goaf is filled with a high-strength filling body, a V-shaped top pillar is formed during stoping of the one-step stope so as to facilitate filling and top connection, the two-step stope is stoped after the strength of the filling body of the one-step stope reaches a design index, and a low-strength filling body is filled after stoping of the two-step stope is finished. The invention has the advantages of simple stope filling and roof connecting process, guaranteed roof connecting quality, high roof connecting rate, capability of effectively improving stope stoping safety of a two-step stope and the like.)

1. The utility model provides a V-arrangement fore-set sublevel rock drilling stage empty field subsequent filling mining method of medium-thickness ore body which characterized in that: the mining method comprises the following steps that ore blocks are arranged along the trend of an ore body, the interior of each ore block is divided into a one-step stope and a two-step stope, the one-step stope is mined firstly, a high-strength filling body is adopted to fill a goaf, a V-shaped top pillar is formed during stoping blasting of the one-step stope to facilitate filling and top connection, the two-step stope is stoped after the strength of the filling body of the one-step stope reaches a design index, and a low-strength filling body is adopted to fill the stope after stoping of the two-step stope is finished.

2. The open-stope subsequent-filling mining method for V-shaped top pillar sublevel drilling stage of medium-thickness ore body according to claim 1, characterized in that: the main mining-preparation cutting engineering comprises a middle section transportation lane, a subsection transportation lane, a stope connecting lane, a subsection rock drilling lane, a filling and air returning connecting lane, a chute, a cutting cross lane, a cutting raise and a mine removal access, wherein the stope connecting lane is arranged on one side of a two-step stope of a mine block and is connected with the subsection rock drilling lane and the subsection transportation lane in parallel, the filling and air returning connecting lane of the one-step stope is arranged on the upper portion of a cutting groove at the middle position of the one-step stope, and the filling and air returning connecting lane of the two-step stope is arranged at the middle position of the two-step stope.

3. The open-stope subsequent-filling mining method for V-shaped top pillar sublevel drilling stage of medium-thickness ore body according to claim 1, characterized in that: when stoping is carried out on the stope in the first step, the cutting groove is arranged in the middle of the stope, deep holes in the front row of each section are blasted backwards to two sides by taking the cutting groove as a free surface and a compensation space, the upper section is advanced and the lower section is in stepped stoping, the bottoms of the deep hole blast holes in the front row of two sides of the uppermost section cutting groove are gradually discharged and reduced by taking the position of the cutting groove as a vertex, the blasting is arranged in an inverted V shape, a V-shaped top column is formed at the upper part during stoping blasting, and caving ore is shoveled out from a bottom ore discharging structure by adopting a scraper; when stoping is conducted on the stope in the second step, the cutting groove is arranged close to the boundary of the stope in the first step, the deep holes in the front row of each section are blasted in a retreating mode by taking the cutting groove as a free surface and compensating space, the upper section is in stepped stoping in advance of the lower section, and the blasted ore is shoveled out from the ore discharge structure at the bottom by using a shoveling and conveying machine.

4. The open-stope subsequent-filling mining method for V-shaped top pillar sublevel drilling stage of medium-thickness ore body according to claim 3, characterized in that: and the hole bottoms of the deep holes in each row of the positive rows on one side of the uppermost segmented cutting groove of the stope in the step are linearly and uniformly reduced according to the length of the stope along the trend, the row pitch and the design height difference between the deep holes in the first row of the positive rows and the deep hole bottoms in the last row of the positive rows.

5. The open-stope subsequent-filling mining method for V-shaped top pillar sublevel drilling stage of medium-thickness ore body according to claim 4, characterized in that: and deep holes in each row of the positive rows are formed in one side of the uppermost segmented cutting groove in the stope in the step, and the design height difference between the deep holes in the first row of the positive rows and the deep hole bottoms in the last row of the positive rows is 3-5 m.

6. The open-stope subsequent-filling mining method for V-shaped top pillar sublevel drilling stage of medium-thickness ore body according to claim 1, characterized in that: the length of the stope in the first step along the strike direction is 15-20 m, the length of the stope in the second step along the strike direction is 30-50 m, and the height of each section is 12-25 m.

7. The open-stope subsequent-filling mining method for V-shaped top pillar sublevel drilling stage of medium-thickness ore body according to claim 1, characterized in that: when the stope is filled in the first step, the 28-day uniaxial compressive strength of the filling bodies at the bottom and the top of the stope is required to be more than or equal to 3Mpa, and the 28-day uniaxial compressive strength of the filling bodies at the other positions is required to be more than or equal to 1-1.5 Mpa; and when the stope is filled in the two steps, filling bodies without adding a cementing material or low-grade filling bodies are adopted for filling.

8. The open-stope subsequent-filling mining method for V-shaped top pillar sublevel drilling stage of medium-thickness ore body according to claim 1, characterized in that: and when stope stoping in the first step is carried out, personnel and equipment enter and exit from stope connecting lanes and sectional rock drilling lanes corresponding to stopes in the two adjacent steps.

9. The open-stope subsequent-filling mining method for V-shaped top pillar sublevel drilling stage of medium-thickness ore body according to claim 2, characterized in that: and the distance between the stope contact road and the boundary of the adjacent ore blocks is 3-5 m.

Technical Field

The invention belongs to the field of underground mining, and particularly relates to an open-stope subsequent filling mining method in a V-shaped top column subsection rock drilling stage of a medium-thickness ore body.

Background

The open stope mining method in the sectional rock drilling stage is one of the main mining methods for mining the stable medium-thickness ore body of the ore rock. The method comprises the steps of dividing an ore body into sections, constructing upward sector-shaped medium-length holes in a sectional rock drilling roadway, withdrawing each section from an upper disc to a lower disc simultaneously, blasting the upper section in a step-withdrawing manner in advance of the lower section for a certain row distance, and discharging the caving ore mainly from a bottom ore removal structure. The method has the advantages of large production capacity of the stope, high efficiency, low cost and the like, thereby having wide application. Before the filling mining method is not popularized, when the medium-thickness ore body is stoped by adopting an open stope mining method in a subsection rock drilling stage, pillars with the length of 8-10 m need to be reserved between stopes, and therefore the ore loss is large. With the popularization and application of filling mining technology, when a medium-thickness ore body is stoped by adopting an open stope mining method in a subsection rock drilling stage, in order to reduce ore pillar loss and filling cost, stoping is generally carried out in two steps, a high-strength filling body is adopted for filling after stoping of a stope in one step is finished, and then stoping of the stope in two steps is carried out. The filling body of the stope in the first step is used as an artificial ore pillar in the stope in the second step. In order to ensure the safety of the two-step stoping operation, the stope in one step needs to ensure the top contact of filling, and the top contact of filling in the stope is a common problem in the prior mine. In order to ensure stope filling and roof contacting, mine engineering technicians currently adopt a plurality of means including: the method comprises the steps of multi-point blanking, forced roof-contacting by pumping, expansion roof-contacting and the like, but the filling roof-contacting rate and the roof-contacting quality cannot be effectively ensured in practice, so that a stope caving site is frequently generated during stope stoping in the two steps, the ore loss and dilution rate is increased, and the stope stoping safety risk is increased.

Therefore, the invention provides an open stope subsequent filling mining method for a V-shaped top column subsection rock drilling stage of a medium-thickness ore body, and aims to solve the problems that in the prior art, the open stope subsequent filling mining method for the subsection rock drilling stage has low filling and roof-connecting quality of one-step stope, and the two-step stope is collapsed in the stope mining process.

Disclosure of Invention

In order to solve the technical problem, the invention provides an open-stope subsequent filling mining method in a V-shaped top column subsection rock drilling stage of a medium-thickness ore body. The main technical characteristics are as follows:

the mining method comprises the following steps that ore blocks are arranged along the trend of an ore body, the interior of each ore block is divided into a one-step stope and a two-step stope, the one-step stope is mined firstly, a high-strength filling body is adopted to fill a goaf, a V-shaped top pillar is formed during stoping blasting of the one-step stope to facilitate filling and top connection, the two-step stope is stoped after the strength of the filling body of the one-step stope reaches a design index, and a low-strength filling body is adopted to fill the stope after stoping of the two-step stope is finished.

The main mining-preparation cutting engineering comprises a middle section transportation lane, a subsection transportation lane, a stope connecting lane, a subsection rock drilling lane, a filling and air returning connecting lane, a chute, a cutting cross lane, a cutting raise and a mine removal access, wherein the stope connecting lane is arranged on one side of a two-step stope of a mine block and is connected with the subsection rock drilling lane and the subsection transportation lane in parallel, the filling and air returning connecting lane of the one-step stope is arranged on the upper portion of a cutting groove at the middle position of the one-step stope, and the filling and air returning connecting lane of the two-step stope is arranged at the middle position of the two-step stope.

Furthermore, when stoping is performed on the stope in the first step, the cutting groove is arranged in the middle of the stope, deep holes in the front row of each section are blasted in a retreating mode towards two sides by taking the cutting groove as a free surface and a compensation space, the upper section is advanced and the lower section is in a step-type stoping, the bottoms of the deep hole blastholes in the front row at two sides of the uppermost section cutting groove are gradually reduced in a row by taking the position of the cutting groove as a vertex, the blasting is arranged in an inverted V shape, a V-shaped top pillar is formed at the upper part while stoping blasting is performed, and caving ore is shoveled out from a bottom ore discharging structure by a scraper; when stoping is conducted on the stope in the second step, the cutting groove is arranged close to the boundary of the stope in the first step, the deep holes in the front row of each section are blasted in a retreating mode by taking the cutting groove as a free surface and compensating space, the upper section is in stepped stoping in advance of the lower section, and the blasted ore is shoveled out from the ore discharge structure at the bottom by using a shoveling and conveying machine.

Further, the hole bottoms of the deep holes in each row of the positive rows on one side of the uppermost segmented cutting groove of the stope in the step are linearly and uniformly reduced according to the length of the stope along the trend, the row pitch and the design height difference between the deep holes in the first row of the positive rows and the deep hole bottoms in the last row of the positive rows.

Preferably, the design height difference between the deep holes in the first row of the positive rows and the deep holes in the last row of the positive rows is 3-5 m.

Preferably, the length of the stope in the first step along the strike direction is 15-20 m, the length of the stope in the second step along the strike direction is 30-50 m, and the height of each section is 12-25 m.

Preferably, when the stope is filled in the one step, the uniaxial compressive strength of the filling bodies at the bottom and the top of the stope for 28 days is required to be more than or equal to 3MPa, and the uniaxial compressive strength of the filling bodies at the other positions for 28 days is required to be more than or equal to 1-1.5 MPa; and when the stope is filled in the two steps, filling bodies without adding a cementing material or low-grade filling bodies are adopted for filling.

Further, when stope stoping in the first step is carried out, personnel and equipment enter and exit from stope connecting lanes and sectional rock drilling lanes corresponding to stopes in two adjacent steps.

Preferably, the distance between the stope contact road and the boundary of the adjacent ore blocks is 3-5 m.

Advantageous effects

Compared with the prior art and the method, the open-stope subsequent filling mining method for the V-shaped top pillar sublevel rock drilling stage of the medium-thickness ore body has the following beneficial effects:

(1) the filling and roof-contacting quality is guaranteed, the roof-contacting rate is high, and the safety of mine production, particularly the stoping process of a two-step stope, can be effectively improved. The V-shaped top pillar is formed in the stope in one step by controlling the hole bottom of the top subsection positive-row blast hole during blasting ore caving, blanking and filling are carried out from the highest position during stope filling, natural roof connection can be achieved by utilizing the gradient of the V-shaped top pillar, the stope in one step is high in filling roof connection rate, the filling roof connection quality is guaranteed, and the safety of stope mining operation in two steps can be effectively guaranteed.

(2) The stope filling and roof connecting process is simple. The methods of multi-point blanking, pumping forced roof-contacting, expansion roof-contacting and the like are not needed.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings.

FIG. 1 is a front view of a V-shaped jack-post sublevel rock drilling stage open-stoping subsequent filling mining method for medium-thickness ore bodies, provided by the invention;

FIG. 2 is a B-B cross-sectional view of a front view of a V-shaped top pillar sublevel rock drilling stage open-stoping subsequent filling mining method for medium-thickness ore bodies, provided by the invention;

FIG. 3 is a C-C sectional view of an elevation view of a V-shaped top pillar sublevel rock drilling stage open-stoped subsequent filling mining method for medium-thickness ore bodies, provided by the invention;

in the figure: 1-middle section transportation lane; 2-sectional transportation lane; 3-stope connecting road; 4-sectional rock drilling roadway; 5-slipping the mine; 6-ore removal and access; 7-V-shaped top pillars; 8-filling an air return connecting roadway; 9-deep holes in a positive row; 10-ore caving; 11-cutting the groove.

Detailed Description

The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.

As shown in the figures 1-3, the V-shaped top pillar sublevel drilling stage open stope subsequent filling mining method ore blocks of the medium-thickness ore body are arranged along the trend of the ore body, the interior of the ore blocks is divided into a one-step stope and a two-step stope, the length of the one-step stope along the trend is 15-20 m, the length of the two-step stope along the trend is 30-50 m, and the sublevel height is 12-25 m. The main mining-preparation cutting engineering comprises a middle section transportation lane 1, a subsection transportation lane 2, a stope connecting lane 3, a subsection rock drilling lane 4, a filling and air returning connecting lane 8, a chute 5, a cutting cross lane, a cutting raise and a mine removal route 6, wherein the stope connecting lane 3 is arranged on one side of a stope in the second step of the ore block and is communicated with the subsection rock drilling lane 4 and the subsection transportation lane 2 in parallel, and the distance between the stope connecting lane 3 and the boundary of the adjacent ore block is 3-5 m; the filling and return air connecting lane 8 of the first-step stope is arranged at the upper part of the cutting groove at the middle position of the first-step stope, and the filling and return air connecting lane 8 of the second-step stope is arranged at the middle position of the second-step stope.

The stope of the one-step stope is mined firstly, the goaf is filled with high-strength filling bodies, and a V-shaped top pillar 7 is formed during stoping blasting of the stope of the one-step stope so as to facilitate the filling and roof jointing. When stoping is carried out in the stope in the first step, the cutting groove 11 is arranged in the middle position of the stope, personnel equipment enters and exits from stope connecting roads 3 and segmented rock chisels 4 corresponding to stopes in the two adjacent steps, deep holes 9 in the positive row of each segment are blasted in a retreating mode towards two sides by taking the cutting groove 11 as a free surface and a compensation space, the upper segment is advanced, the lower segment is in stepped stoping, and the blast hole bottoms of the deep holes 9 in the positive row at two sides of the uppermost segmented cutting groove 11 are reduced row by taking the position of the cutting groove 11 as the vertex, the blast hole bottoms are arranged in an inverted V shape, the hole bottoms of the deep holes 9 in each row of the positive row at one side of the cutting groove 11 are linearly and uniformly reduced according to the trend length and the row distance of the stope and the designed height difference of the deep holes 9 in the first row of the positive row and the deep holes 9 in the last row of the positive row, and the designed height difference of the deep holes 9 in the first row of the positive row and the deep holes 9 in the last row at one side of the cutting groove 11 is 3-5 m. And forming a V-shaped top pillar 7 at the upper part of the stoping blasting process, and shoveling the collapsed ore 10 from a bottom ore removal structure by adopting a scraper. And filling the goaf after ore removal, wherein in the filling of a stope in one step, the 28-day uniaxial compressive strength requirement of the filling bodies at the bottom and the top of the stope is more than or equal to 3Mpa, and the 28-day uniaxial compressive strength requirement of the filling bodies at the other positions is more than or equal to 1-1.5 Mpa.

And (3) stoping the stope in the two steps after the strength of the filling body of the stope in the one step reaches the design index, and filling the stope in the two steps by adopting a low-strength filling body after the stope in the two steps is stoped. When stoping in the stope in the second step, the cutting groove 11 is arranged close to the boundary of the stope in the first step, the deep hole 9 in the positive row of each section is blasted in a retreating mode by taking the cutting groove 11 as a free surface and a compensation space, the upper section is in stepped stoping in advance of the lower section, and the caving ore 10 is shoveled out from a bottom ore removal structure by adopting a scraper. And filling the goaf after ore removal, and filling by using a filling body without adding a cementing material or a low-grade filling body when the stope is filled in the two steps.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.