CN111206956A - Method for filling and reinforcing left coal pillars in goaf by room-type coal mining method - Google Patents
Method for filling and reinforcing left coal pillars in goaf by room-type coal mining method Download PDFInfo
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- CN111206956A CN111206956A CN202010026930.XA CN202010026930A CN111206956A CN 111206956 A CN111206956 A CN 111206956A CN 202010026930 A CN202010026930 A CN 202010026930A CN 111206956 A CN111206956 A CN 111206956A
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- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
Abstract
The invention provides a goaf remaining coal pillar filling and reinforcing method by a room coal mining method. According to the invention, through drilling in the reinforcing area of the left coal pillar, the cemented filling material automatically flows and is self-stagnated, and the goaf supporting pillar is formed in the reinforcing area of the left coal pillar, so that the stress load borne by the nearby left coal pillar is reduced; a plurality of remaining coal pillar reinforcing areas perform circular operation, and all working procedures are not interfered with each other; reinforcing the left coal pillars in a plurality of local areas at fixed points; simple structure, the operation is high-efficient, and equipment drops into fewly, and construction cost is low, consolidates effectually, and the security is high.
Description
Technical Field
The invention relates to the technical field of control of surface subsidence through reinforcing of a left coal pillar, in particular to a method for filling and reinforcing the left coal pillar in a goaf by a room-type coal mining method.
Background
The room and pillar type mining method is mostly applied to areas with wide resource distribution, simple geological structure and shallow coal seam occurrence, and a large number of coal resources are wasted because a large number of left coal pillars are not mined, thereby threatening the safety of mines and causing serious damage to the surrounding ecological environment. However, the traditional method for recycling the left coal pillar, such as the split pillar type and the bin wing type, has the defects of low recycling efficiency, low mechanization degree and the like. The use of material throwing filling and comprehensive mechanized filling recovery requires the delivery of large quantities of solid filling material to the gob, which results in excessive transportation costs and equipment investment.
Disclosure of Invention
In order to solve the problems, the invention provides a method for filling and reinforcing the left coal pillars in the goaf by a house-type coal mining method, which has the advantages of simple structure, high operation efficiency, less equipment investment, low construction cost, good reinforcing effect and high safety.
The technical scheme is as follows: the invention provides a goaf remaining coal pillar filling and reinforcing method by a room coal mining method, which comprises the following steps of carrying out numerical analysis to determine the region and range of a remaining coal pillar to be reinforced through the occurrence characteristics of the goaf remaining coal pillar by the room coal mining method and the physical and mechanical parameters of coal rock mass, forming a goaf supporting pillar by a ground drilling self-flowing self-stagnation and multiple times of filling of cemented filling materials, and carrying out fixed-point reinforcement on the remaining coal pillar in a plurality of local regions, wherein the specific steps are as follows:
s1, surveying and collecting mining geological data of the left coal pillar mine in the goaf of the room coal mining method to obtain occurrence characteristics of the left coal pillar; sampling the coal rock mass, and testing physical and mechanical parameters; the occurrence characteristics of the left coal pillar comprise the working face width W and the pushing length L of the goaf left coal pillar area2(ii) a The size of the remaining coal pillar; coal seam burial depth H; coal seam dip angle
S2, constructing a long-time creep stability numerical analysis model of the goaf left coal pillar in the room coal mining method according to the physical and mechanical parameters of the coal rock mass test, and determining a drilling center point O of a left coal pillar reinforced area; and obtaining the relation between the stress load of the left coal pillar near the O point and the theoretical radius of the reinforced area of the left coal pillar, and selecting the proper theoretical radius R of the reinforced area of the left coal pillar.
S3 based onThe occurrence characteristics of the left coal pillars and the theoretical radius R of the reinforced area of the left coal pillars, the compaction step pitch measurement by simulating the rock stratum movement calculation result and the basic top fracture and the determination of the interval L of the drilling central points O of the adjacent reinforced areas of the left coal pillars1(ii) a By drilling with ground casing at intervals of L1Filling and drilling at fixed points; interval L of drilling central points O of adjacent left coal pillar reinforced areas1Is 50 to 200 m.
S4, arranging a ground cemented filling material preparation and transportation system, circularly operating a plurality of remaining coal pillar reinforcement areas, forming goaf supporting pillars by adopting a vertical self-flowing self-stagnation and fractional filling method, and completing reinforcement of the remaining coal pillars in the underground area.
Further, each remaining coal pillar reinforcement area covers a plurality of remaining coal pillars.
Further, the volume of the cemented filling material filled in each remaining coal pillar reinforcement area
V≥f(πhR2-V1)
In the formula: h is the reinforcement height of the left coal pillars;
V1reinforcing the volume of the coal pillar within the range of the area for the left coal pillar;
f is the filling margin coefficient.
Has the advantages that: according to the invention, the cemented filling material automatically flows and is automatically stagnated in the reinforcing area of the left coal pillar through drilling, and the goaf supporting pillar formed in the reinforcing area of the left coal pillar reduces the stress load born by the nearby left coal pillar; a plurality of remaining coal pillar reinforcing areas perform circular operation, and all working procedures are not interfered with each other; reinforcing the left coal pillars in a plurality of local areas at fixed points; the structure is simple, the operation is efficient, the equipment investment is less, the construction cost is low, the reinforcing effect is good, and the safety is high; the method can effectively solve the problems of water burst, sand burst, water and soil loss and surface subsidence caused by long-term instability and damage of the coal pillars left in the goaf of the ecological fragile mining area by the room-type coal mining method, and has important significance in the aspects of improving the resource recovery rate and reducing the surface subsidence to protect the ecological environment by recovering the room-type coal pillars on a large scale.
Drawings
FIG. 1 is a sectional view of a work surface of the present invention;
FIG. 2 is a top plan view of the worksurface of the present invention;
FIG. 3 is a model of long term creep stability analysis of a remaining coal pillar according to the present invention;
FIG. 4 is a graph showing the relationship between the stress load of the remaining coal pillar closest to the point O and the theoretical radius of the reinforced area of the remaining coal pillar.
Detailed Description
The specific embodiment of the invention is as follows: the invention is used for a 3# coal seam in a certain ecological fragile mining area, the average thickness of the coal seam is 4.5m, the traditional room coal mining method is adopted for mining, a large number of room coal pillars 2 are left in the mine range, so that the coal resource waste is caused, and the ecological damage such as water burst, sand burst, water and soil loss, surface subsidence and the like can be easily caused by the long-term instability of the left coal pillars 2.
Referring to fig. 1 and 2, the invention determines the region and range of the left coal pillar 2 to be reinforced by numerical analysis through the occurrence characteristics of the left coal pillar in the goaf of the room-type coal mining method and the physical and mechanical parameters of the coal rock mass, forms the goaf supporting pillar 1 by the way of ground drilling self-flow self-stagnation and multiple filling of cemented filling materials, and performs fixed-point reinforcement on the left coal pillars 2 in a plurality of local regions, and the specific steps are as follows:
s1, investigating and collecting mining geological data of the coal pillar mine left in the goaf by the room-type coal mining method, taking 1201 as an example of a working face, wherein the width W of the working face is 97m, and the pushing length L of the working face is L2850m, the coal seam burial depth H is 170m, and the coal seam dip angle
Is 2 degrees, and the size of the left coal pillar 2 is 8m multiplied by 4 m; and sampling the coal rock mass, and testing physical and mechanical parameters, as shown in table 1.
TABLE 1 coal petrography physical and mechanical parameter test results
S2, constructing a long-time creep stability numerical analysis model of the left coal pillar in the goaf of the room coal mining method shown in figure 3 according to the physical and mechanical parameters of the coal rock mass test, and determining a drilling center point O of a reinforced area of the left coal pillar; obtaining the relation between the stress load of the left coal pillar 2 near the O point and the theoretical radius of the reinforced area of the left coal pillar; selecting a proper theoretical radius R of a left coal pillar reinforcement area; fig. 4 shows the stress load σ of the remaining coal pillar 2 closest to the point O when the theoretical radii R of the remaining coal pillar reinforced region are 9m, 18m, and 27m, respectively; finally, selecting a theoretical radius R of a remaining coal pillar reinforcement area as 18m, wherein the O point is positioned in the middle of a stope at a distance of 63.5m from the tangential hole;
as can be seen from fig. 4, the goaf supporting pillars 1 formed in the remaining coal pillar reinforcement region reduce the stress load borne by the nearby remaining coal pillars 2, and perform fixed-point reinforcement on the remaining coal pillars 2 in a plurality of local regions; the larger the theoretical radius of the reinforced area of the left coal pillar is, the smaller the stress load borne by the nearby left coal pillar 2 is;
preferably, leave over coal pillar and consolidate regional theoretical radius R and should be big enough, guarantee that every leaves over coal pillar and consolidate regional cover a plurality of coal pillars 2 of leaving over, consolidate effect economy and high efficiency.
S3, based on occurrence characteristics of the left coal pillars and theoretical radiuses R of the reinforced areas of the left coal pillars, simulating rock stratum movement calculation results and basic top breakage to compact and measure the step pitch, and determining intervals L of drilling center points O of the adjacent reinforced areas of the left coal pillars1(ii) a By drilling with ground casing at intervals of L1Filling and drilling 3 for fixed-point construction; interval L of drilling central points O of adjacent left coal pillar reinforced areas150-200 m; in the embodiment, 9 filling wells 3 are designed to be constructed on the ground at fixed points at intervals of 90 m.
S4, arranging a ground cemented filling material preparation and transportation system 4, circularly operating a plurality of remaining coal pillar reinforcement areas, forming a goaf supporting pillar 1 by adopting a vertical self-flowing self-stagnation and fractional filling method, and completing reinforcement of the remaining coal pillars 2 in the underground area.
Volume of cemented filling material filled in each remaining coal pillar reinforcement area
V≥f(πhR2-V1)＝2×(3.14×4×182-8×8×4×4)m3＝6090.88m3
In the formula: h is the reinforcing height of the coal pillar, and the value is 4 m;
r is the theoretical radius of the reinforcing area of the left coal pillar, and the value is 18 m;
V1the volume of the coal pillars in the left coal pillar reinforcement area is set to be 4;
f is filling margin coefficient, and the value is 2.0.
Preferably, the cemented filling material comprises ground natural aeolian sand, fly ash, 42.5# Portland cement and water, and the mass fractions of the materials are 45%, 21%, 6% and 72% respectively; the maintaining time of the goaf supporting column 1 is 3d, the compressive strength of 14d and the compressive strength of 28d are respectively 0.8MPa, 2.4MPa and 2.8 MPa.
Claims (6)
1. A method for filling and reinforcing left coal pillars in a goaf by a house-type coal mining method is characterized by comprising the following steps: leave over the coal pillar and have the appearance characteristic through room formula coal mining method collecting space to and the physical mechanics parameter of coal rock mass, carry out numerical analysis and confirm that leave over the coal pillar and need reinforced (rfd) region and scope, through the ground drilling artesian from stagnating, the mode of filling cemented filling material many times, form collecting space support column, carry out the fixed point to a plurality of local areas and consolidate, concrete step is as follows:
s1, surveying and collecting mining geological data of the left coal pillar mine in the goaf of the room coal mining method to obtain occurrence characteristics of the left coal pillar; sampling the coal rock mass, and testing physical and mechanical parameters;
s2, constructing a long-time creep stability numerical analysis model of the goaf left coal pillar in the room coal mining method according to the physical and mechanical parameters of the coal rock mass test, and determining a drilling center point O of a left coal pillar reinforced area; obtaining the relation between the stress load of the left coal pillar near the O point and the theoretical radius of the left coal pillar reinforced area, and selecting the proper theoretical radius R of the left coal pillar reinforced area;
s3, based on occurrence characteristics of the left coal pillars and theoretical radiuses R of the reinforced areas of the left coal pillars, simulating rock stratum movement calculation results and basic top breakage to compact and measure the step pitch, and determining intervals L of drilling center points O of the adjacent reinforced areas of the left coal pillars1At intervals of L by drilling with ground casing1Filling and drilling at fixed points;
s4, arranging a ground cemented filling material preparation and transportation system, circularly operating a plurality of remaining coal pillar reinforcement areas, forming goaf supporting pillars by adopting a vertical self-flowing self-stagnation and fractional filling method, and completing reinforcement of the remaining coal pillars in the underground area.
2. The method for filling and reinforcing the left coal pillar in the goaf of the house coal mining method according to claim 1, characterized in that: each left-over coal pillar reinforcement area covers a plurality of left-over coal pillars.
3. The method for filling and reinforcing the left coal pillar in the goaf of the house coal mining method according to claim 2, characterized in that: volume of the cemented filling material filled in each remaining coal pillar reinforcement area:
V≥f(πhR2-V1)
in the formula: h is the reinforcement height of the left coal pillars;
V1reinforcing the volume of the coal pillar within the range of the area for the left coal pillar;
f is the filling margin coefficient.
4. The method for filling and reinforcing the left coal pillar in the goaf of the house coal mining method according to any one of claims 1 to 3, characterized in that: the occurrence characteristics of the left coal pillar comprise the working face width W and the pushing length L of the goaf left coal pillar area2(ii) a The size of the remaining coal pillar; coal seam burial depth H; coal seam dip angle
5. The method for filling and reinforcing the left coal pillar in the goaf of the house coal mining method according to claim 4, characterized in that: the coal seam buried depth H is 50-300 m, and the coal seam dip angle
Is 0 to 8 degrees.
6. The method for filling and reinforcing the left coal pillar in the goaf of the house coal mining method according to claim 5, characterized in that: interval L of drilling central points O of adjacent left coal pillar reinforced areas1Is 50 to 200 m.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113688462A (en) * | 2021-10-26 | 2021-11-23 | 中煤科工集团西安研究院有限公司 | Design method for controlling filling key parameters of strip-type goaf |
| CN113704863A (en) * | 2021-10-28 | 2021-11-26 | 中煤科工集团西安研究院有限公司 | Method for designing key parameters for controlling filling of room-and-column type goaf |
| CN113931629A (en) * | 2021-10-26 | 2022-01-14 | 中国矿业大学 | Water-blocking stability control method for mining overburden seepage isolation belt |
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| CN113931629B (en) * | 2021-10-26 | 2023-03-21 | 中国矿业大学 | Water-blocking stability control method for mining overburden seepage isolation belt |
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