CN108035715A - A kind of unregulated fully mechanized coal mining face just adopts stage isometric tune face method - Google Patents

Abstract

The invention discloses an equal-length surface adjustment method in the initial mining stage of an irregular fully-mechanized mining face, which belongs to the technical field of coal mining. It solves the technical problems of slow advancing progress and great potential safety hazards in the prior art due to frequent frame reduction and shortened scraper conveyor length at the initial stage of pushing and mining at the working face. The method of the present invention includes: firstly determining the length of the cutting hole in the initial mining stage; then determining the center of surface adjustment and the radius of rotation of surface adjustment; then determining the radius of rotation of surface adjustment; The central angle is to calculate the angle between the first section of the surface adjustment roadway and the cut hole from the center angle, determine the layout direction of the first section of the surface adjustment roadway, and then continue to arrange the second section and other subsequent surface adjustment roadways in the same way , until the face-adjusting roadway is connected with the track along the trough. The invention can cancel the processes of continuously shortening the length of the working face, frequently reducing the frame and shortening the length of the scraper conveyor at the initial stage of mining in the fully mechanized mining face, and improves the mining efficiency and safety.

Description

A method of equal-length face adjustment in the initial mining stage of irregular fully mechanized mining face

technical field

The invention relates to the technical field of coal mining, in particular to a method for equal length face adjustment in the initial mining stage of an irregular fully mechanized mining face.

Background technique

Restricted by the occurrence conditions of coal seams, the geological conditions of general mines are relatively complex, and the layout of cutting holes in coal mining face is often affected by oblique faults with large drop. In order to improve the resource recovery rate, when an oblique fault with a large drop is encountered near the cutting hole in the working face, the cutting hole is generally arranged similar to the parallel oblique fault, and the angle between the cutting hole and the roadway in the working face is no longer It is a right angle, the length of the cut hole is greater than the vertical distance between the two along-channel roadways of the working face, and there is a triangular area in the initial mining stage of the working face, resulting in irregular shape of the working face.

In view of the above-mentioned irregular working faces, at present, most coal mines in China adopt fan-shaped inclination mining. By adjusting the advancing direction of the working face, gradually shortening the length of the working face, reducing the frame and shortening the length of the conveyor many times during the mining process, the initial mining is completed. The face-adjusting work in the stage leads to the frequent reduction of racks and the shortening of the length of the scraper conveyor at the initial stage of the working face. The labor intensity of the workers is relatively high, the progress of the advance is slow, and the potential safety hazards increase.

Contents of the invention

Aiming at the above-mentioned technical defects in the prior art, the present invention proposes a method of equal-length face adjustment in the initial mining stage of the irregular fully mechanized mining face. And shorten the length of the scraper conveyor and other processes to improve mining efficiency and safety.

Its technical solutions include:

A method for equal-length face adjustment in the initial mining stage of an irregular fully-mechanized mining face, said method sequentially comprising the following steps:

a. When the track trough and the transport trough of the irregular fully-mechanized mining face are affected by a non-water-conducting oblique fault with a large drop with an angle α greater than 40°, along the non-hydraulic slope Arrange cut-outs in a direction substantially parallel to the extension direction of the intersecting fault, and leave a protective coal pillar with a width of 5m between the cut-out and the non-water-conducting oblique fault. One end of the cut-out is connected to the transport channel and Extending from the transport trough to the track trough direction, the cutout adopts a rectangular section with a certain width;

b. Determine the noodle adjustment center and the noodle adjustment rotation radius: take the scraper conveyor head end at the connection between the cut eye and the transport trough as the noodle adjustment center, and use formula (1) to determine the noodle adjustment rotation radius;

The radius of rotation of the surface adjustment=the length of the cut hole L+the distance ε(1) between the head end of the scraper conveyor and the coal wall side of the transport channel;

c, calculate the parameter of the first section of face-adjusting connecting lane, and described parameter adopts following method to determine;

c1. Determine the width x of the face-adjusting roadway according to the characteristics of the coal seam roof rock layer and technical and economic factors;

c2. In the roadway layout plan, take the center of the surface adjustment as the center of the circle, and the radius of rotation of the surface adjustment as the radius, draw a circle to connect the inner side of the track along the groove and the inner side of the other end of the cut hole;

c3. According to the formula (2), solve the central angle β corresponding to the first section of the face-adjusting roadway:

cosβ/2=(L+ε-x+y)/(L+ε) (2);

In the formula (2): y is the minimum distance between the tail end of the scraper conveyor and the outer side of the surface-adjusting roadway;

L is the length of the incision;

x is the width of the connecting lane;

ε is the distance between the head end of the scraper conveyor and the coal wall side of the transport channel;

c4. According to formula (3), determine the angle γ

γ=90°-β/2 (3);

c5. Determine the length Z of the first section of noodle-adjusting liaison lane with the corresponding arc section chord length corresponding to the central angle β of the first section of noodle-adjusting liaison lane, as shown in formula (4):

Z=2(L+ε)sinβ/2 (4);

d. The first section of the noodle-adjusting contact lane adopts a rectangular section. According to the angle γ between the first section of the noodle-adjusting alley and the incision hole, and the width x of the noodle-adjusting contact alley, the inner side and outer side of the roadway are arranged, and the first section of the adjustment is adopted. The length Z of the face connecting lane is the extension length of the lane;

e. After step d, after the first section of surface adjustment roadway is arranged, refer to step c to calculate the parameters of the next section of surface adjustment roadway and arrange the next section of surface adjustment roadway, and so on until the last section of surface adjustment roadway and track Connected along the groove;

f. Arrange the initial mining face equipment and start face adjustment and recovery.

As a preferred solution of the present invention, the opening adopts the "anchor net cable + steel belt" support method, and two rows of single point columns are added in the middle for support, and the upper and lower ends of the opening are respectively equipped with 2 sets The head bracket and the scraper conveyor are arranged near the coal wall of the cut hole, and the reloader and belt conveyor are arranged on the side of the transport chute near the working face.

As another preferred solution of the present invention, the width x of the noodle regulating lane is 5-6m.

Preferably, the minimum distance y between the tail end of the scraper conveyor and the outer side of the surface-adjusting roadway is 1-2m.

Preferably, the method is applied to a strike longwall or inclined longwall coal mining method with a coal seam dip angle less than 12°.

In the above step b, since the center point of the surface adjustment is selected at the end of the working face, the roof support repeatedly supports the roof, and the maintenance of the roof is difficult, so it needs to be strengthened; , to ensure enough space for the bracket to prevent the phenomenon of squeezing and biting the frame.

Compared with the prior art, the present invention brings the following beneficial technical effects:

In the initial mining stage of the irregular fully-mechanized mining face, adopting the method of equal-length face-adjusting mining and arranging face-adjusting and connecting roadways can ensure that the initial mining stage of the working face advances with the same length of the working face, eliminating the frequent reduction in the early stage of mining. It reduces the labor intensity and improves the work efficiency and safety; therefore, the equal-length face adjustment method in the initial mining stage of the irregular fully mechanized mining face can give full play to the advantages of comprehensive mechanized mining and improve the comprehensive mechanized mining. Adaptability to complex geological conditions.

The invention proposes a method for equal-length face adjustment in the initial mining stage of an irregular fully-mechanized mining face, which is realized by reasonably determining the length of the cutting hole of the working face, the segmental length and width of the connecting roadway in the face adjustment, and ensures that the irregular working face The initial mining stage can be advanced with the same length of the working face, which reduces the frequent reduction of racks and shortening the length of the scraper conveyor in the early stage of pushing and mining, saves a lot of manpower, and improves work efficiency and technical and economic effects.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing:

Fig. 1 is the cut hole and the arrangement diagram of the connecting roadway of the equal-length face adjustment method in the initial mining stage of the irregular fully-mechanized mining face of the present invention;

Fig. 2 is the central angle β corresponding to the first section of the face-adjusting connection roadway of the irregular fully-mechanized mining face initial mining stage equal-length face-adjusting method of the present invention;

Among them, 1-track trough; 2-transportation trough; 3-cutting eye; 4-the first section of noodle adjustment connecting lane; 5-the second section of noodle adjustment connecting lane; 6-working face scraper conveyor; 7 -head end of scraper conveyor; 8-reloader and belt conveyor; 9-fault.

Detailed ways

The present invention proposes a method for equal-length face adjustment in the initial mining stage of irregular fully-mechanized mining working faces. In order to make the advantages and technical solutions of the present invention clearer and clearer, the present invention will be further described below in conjunction with specific examples.

The present invention adopts an equal-length surface adjustment method in the initial mining stage of the irregular fully mechanized mining face, which is mainly realized through the following steps:

Step 1. When the track trough and the transport trough of the working face are affected by a large drop oblique fault (the angle between fault 9 and the trough roadway α>40°), generally follow the direction roughly parallel to the extension direction of the oblique fault Arrange cutouts, and leave a 5m protective coal pillar between the cutouts and oblique faults (non-water-conducting faults). The vertical distance between the grooves, the cutout adopts a rectangular section with a large width; the support of the cutout is anchor net cable + steel belt support, and two rows of single point columns are added in the middle for support, and the upper and lower ends Each head is equipped with two end brackets, the scraper conveyor 6 on the working face is arranged near the coal wall, and the reloader and belt conveyor 8 are arranged on the side of the transport trough near the working face;

Step 2. Select the head end 7 of the scraper conveyor at the junction of the cut hole and the transport trough as the noodle adjustment center in the initial mining stage;

Step 3. Determine the optimal layout width x of the face-adjusting contact roadway. The larger the width x of the face-adjusting contact roadway, the longer the broken line section of the face-adjusted contact roadway, and the less the number of broken line segments, the more conducive to construction; according to the coal seam roof condition, the general contact Lane width x is preferably 5-6m;

Step 4. In the roadway layout plan, take L+ε as the surface adjustment rotation radius (ε is the distance between the head end of the scraper conveyor and the side road side of the transport trough working face), draw a circle with the head end as the center, Connect the inner side of the track along the groove and the inner side of the incision eye;

Step 5. Determine the central angle β corresponding to the connecting roadway of the first section of surface adjustment according to the width x of the connecting roadway, and the angle β can be obtained according to the following formula:

cosβ/2＝(L+ε-x+y)/(L+ε)

In the formula, L - the length of the working face; ε - the distance between the head end of the scraper conveyor and the side road side of the transporting trough working face; 6m; y- the minimum distance between the tail of the scraper conveyor and the outer side of the contact roadway, generally 1-2m, preferably 1m;

Step 6: Determine the included angle γ between the first section of noodle-adjusting connecting lane and the incision hole according to β. The γ angle can be obtained according to the following formula:

γ=90°-β/2

Step 7. Arrange the face-adjusting contact roadway according to the angle γ between the opening and the cut hole. The length Z of the first face-adjusting contact roadway is the chord length of the arc segment corresponding to the β angle, Z=2(L+ε)sinβ/2 , when the radius is L, the chord corresponding to the β angle is arranged as the inner side of the connecting roadway, and the outer side is arranged on the outer side of the inner side according to the width x of the connecting roadway on the adjusted surface (the outer side is arranged 1m outside the arc apex), and the connecting roadway adopts a rectangular section;

Step 8. After the first section of noodle-adjusting contact roadway corresponding to the angle β is arranged, continue to arrange the second section of noodle-adjustment contact alley 5 and other follow-up noodle-adjustment contact alleys in the same way until the noodle-adjustment contact alley is in line with the track connected;

Step 9: Arrange the working face equipment and start face adjustment and recovery.

Example 1:

As shown in Figure 1 and Figure 2, the specific methods include:

The determination of the length of the cut hole 3 in the irregular fully mechanized mining face, the determination of the central angle β corresponding to the first section of the face-adjusting contact roadway 4, and the determination of the segmental length and width of the face-adjusting contact roadway, when the track is arranged along the groove 1 and When the transportation channel 2 is affected by oblique faults with large drop (the angle between the fault and the roadway along the channel is α>40°), the openings are arranged along the direction roughly parallel to the extension direction of the oblique faults, and the openings A 5m protective coal pillar is left between the excavation and the oblique fault 9 (non-water-conducting fault), and the length of the cut hole is the vertical distance L between two parallel grooves. 5~6m, use the cosine formula cosβ/2==(L+ε-x+y)/(L+ε) of the center angle and half-angle cosine of the first section of the face-adjusting roadway, ε is the head end of the scraper conveyor The distance from the coal wall side of the trough, y is the minimum distance between the tail of the scraper conveyor and the outer side of the face-adjusting roadway during the rotation process, preferably 1m, and calculate the central angle β corresponding to the first section of the face-adjusting roadway, and then Use the scraper conveyor head 7 at the junction of the cut hole and the transport trough as the face adjustment center to carry out equal-length face adjustment mining, and arrange the face adjustment contact roadway according to the angle γ=90°-β/2 between the cut hole and the cut hole , the length Z of the first section of the face-adjusting contact roadway is the chord length of the arc segment corresponding to the β angle, Z=2(L+ε)sinβ/2, when the radius is L, the chord corresponding to the β angle is arranged as the inner side of the contact roadway , the outer side is arranged according to the width x of the face-adjusting roadway on the outside of the inner side (the outer side is arranged 1m outside the arc apex), the roadway adopts a rectangular roadway, and the face-adjusting mining is continued, and the face-adjusting contact roadway is arranged at an angle of β in a cycle until the face-adjusting contact The roadway is connected with the transport chute.

In this embodiment, the surface adjustment center should be selected in an area with relatively good geological conditions and stable surrounding rock.

In this embodiment, by the cosine formula cosβ/2==(L+ε-x+y)/(L+ε) of the central angle half-angle cosine of the first section of noodle-adjusting connection lane, the best noodle-adjusting angle β= 2arccos(L+ε-x+1)/(L+ε).

In this embodiment, the support needs to be strengthened at the fork in the center of the adjustment surface. In addition to the conventional support, point columns need to be encrypted.

In this example, the face-adjusting roadway is supported by "anchor net cable + steel belt", and the length of the anchor cable is adjusted appropriately depending on the thickness of the coal seam. Generally, the depth of anchoring into hard rock is not less than 1.5m, and the bird's nest anchor cable is required. .

In this embodiment, in order to effectively control the deformation of the surrounding rock and the resistance of the bolt support in the face-adjusting contact roadway, pressure relief members are added to the side bolt.

In this embodiment, when the working surface is adjusted, it is necessary to control the support and the conveyor based on the machine head to prevent the support and the conveyor from sliding down.

The parts not mentioned in the present invention can be realized by adopting or referring to the prior art.

Although terms such as the first section of noodle-adjusting liaison lane and the second section of noodle-adjusting liaison lane are used more in this paper, the possibility of using other terms is not excluded. Those skilled in the art will understand these under the inspiration of the present invention Simple replacement of terms should be within the protection scope of the present invention.

Claims (5)

1. a method for equal-length face adjustment in the initial mining stage of an irregular fully-mechanized mining face, characterized in that, the method may further comprise the following steps: a. When the track trough and the transport trough of the irregular fully-mechanized mining face are affected by a non-water-conducting oblique fault with a large drop with an angle α greater than 40°, along the non-hydraulic slope Arrange cut-outs in a direction substantially parallel to the extension direction of the intersecting fault, and leave a protective coal pillar with a width of 5m between the cut-out and the non-water-conducting oblique fault. One end of the cut-out is connected to the transport channel and Extending from the transport trough to the track trough direction, the cutout adopts a rectangular section with a certain width; b. Determine the noodle adjustment center and the noodle adjustment rotation radius: take the scraper conveyor head end at the connection between the cut eye and the transport trough as the noodle adjustment center, and use formula (1) to determine the noodle adjustment rotation radius; The radius of rotation of the surface adjustment=the length of the cut hole L+the distance ε(1) between the head end of the scraper conveyor and the coal wall side of the transport channel; c, calculate the parameter of the first section of face-adjusting connecting lane, and described parameter adopts following method to determine; c1. Determine the width x of the face-adjusting roadway according to the characteristics of the coal seam roof rock layer and technical and economic factors; c2. In the roadway layout plan, take the center of the surface adjustment as the center of the circle, and the radius of rotation of the surface adjustment as the radius, draw a circle to connect the inner side of the track along the groove and the inner side of the other end of the cut hole; c3. According to the formula (2), solve the central angle β corresponding to the first section of the face-adjusting roadway: cosβ/2=(L+ε-x+y)/(L+ε) (2); In the formula (2): y is the minimum distance between the tail end of the scraper conveyor and the outer side of the surface-adjusting roadway; L is the length of the incision; x is the width of the connecting lane; ε is the distance between the head end of the scraper conveyor and the coal wall side of the transport channel; c4. According to the formula (3), determine the angle γ between the first section of the noodle-adjusting connecting lane and the incision hole: γ=90°-β/2 (3); c5. Determine the length Z of the first section of noodle-adjusting liaison lane with the corresponding arc section chord length corresponding to the central angle β of the first section of noodle-adjusting liaison lane, as shown in formula (4): Z=2(L+ε)sinβ/2 (4); d. The first section of the noodle-adjusting contact lane adopts a rectangular section. According to the angle γ between the first section of the noodle-adjusting alley and the incision hole, and the width x of the noodle-adjusting contact alley, the inner side and outer side of the roadway are arranged, and the first section of the adjustment is adopted. The length Z of the face connecting lane is the extension length of the lane; e. After step d, after the first section of surface adjustment roadway is arranged, refer to step c to calculate the parameters of the next section of surface adjustment roadway and arrange the next section of surface adjustment roadway, and so on until the last section of surface adjustment roadway and track Connected along the groove; f. Arrange the initial mining face equipment and start face adjustment and recovery. 2. A method for equal-length face adjustment in the initial mining stage of an irregular fully-mechanized mining face according to claim 1, characterized in that: the opening adopts the "anchor net cable + steel belt" support method, and the middle Two rows of single point column support are added, two end brackets are installed at the upper and lower ends of the cut eye, and the scraper conveyor is arranged near the coal wall of the cut eye, and a reprinter is arranged on the side of the transport chute close to the working face. machines and belt conveyors. 3. A method for equal-length face adjustment in the initial mining stage of an irregular fully-mechanized mining face according to claim 1, characterized in that: the width x of the face adjustment connecting lane is 5-6m. 4. A method for equal-length face adjustment in the initial mining stage of an irregular fully mechanized mining face according to claim 1, characterized in that: the minimum distance y between the tail end of the scraper conveyor and the outer side of the face-adjustment contact roadway It is 1-2m. 5. A method for equal-length face adjustment in the initial mining stage of an irregular fully-mechanized mining face according to claim 1, characterized in that: said method is applied to longwall or inclined longwall coal mining where the inclination angle of the coal seam is less than 12° Law.