Construction method of equal-length working face under complex geological conditions

Abstract

The application discloses a kind of complex geological conditions under equal length working face construction method, the working face is equidistantly opened with several profiles, the side of the working face is equipped with transport crossheading, the other side is equipped with rail crossheading, the open-off cut is located at the starting end of working face, and the closure wall is arranged at the front end of the first profile on both sides of the working face.The application starts from the design source, realizes the layout of equal length working face through elevation control and construction orientation adjustment, and is assisted by rail transport crossheading to adjust the direction of mining and eliminate differences, avoids the problem of unequal length working face caused by geological conditions, and increases or decreases support during mining, eliminates the safety problem caused by increasing or decreasing support, reduces the influence of increasing or decreasing support on normal production of working face, adjusts the direction of rail crossheading and realizes equal length working face, thereby reducing the labor intensity of workers and ensuring the safe and efficient mining of working face.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mining, in particular to a method for constructing an equal-length working face under complex geological conditions. Background Art

[0002] During typical working face design, the trackway and transport chute are arranged parallel to the same orientation. However, under complex geological conditions, the instability of coal seam occurrence and the influence of tectonic structures can alter the local occurrence of coal seams, causing irregular variations in coal seam inclination. If traditional working face design is still used in this situation, the length of the working face in the inclination direction will be unequal, requiring the addition (or removal) of supports at regular intervals.

[0003] Adding supports to the working face requires the construction of support storage chambers and winch pits, which increases the amount of work in the upwind tunnel; reducing supports on the working face requires the construction of support dismantling chambers, which affects the advancement of the working face; at the same time, since the comprehensive mining support equipment is heavy and inconvenient to transport, adding and reducing supports during mining poses a great safety threat, affecting the normal production of the working face, increasing the labor intensity of workers, and seriously restricting the construction of high-yield and efficient working faces in mines.

[0004] A Chinese document with announcement number CN108035715B discloses a method for equal-length face adjustment in the initial mining stage of an irregular fully mechanized mining face. The patent determines the length of the cut in the initial mining stage; then determines the face adjustment center and the face adjustment rotation radius; then determines the face adjustment rotation radius, determines the central angle corresponding to the first section of the face adjustment connecting tunnel by the width of the face adjustment connecting tunnel, calculates the angle between the first section of the face adjustment connecting tunnel and the cut from the central angle, determines the layout direction of the first section of the face adjustment connecting tunnel, and then continues to arrange the second section and other subsequent face adjustment connecting tunnels in the same way until the face adjustment connecting tunnel is connected to the track chute, thereby eliminating the processes of continuously shortening the working face length, frequently reducing frames and shortening the length of the scraper conveyor in the initial stage of fully mechanized mining. However, this patent is achieved by removing the supports, and does not achieve the arrangement of equal-length working faces from the source. It is easy to have unequal working faces due to geological conditions, and the problem of adding and reducing supports during mining greatly increases the labor intensity of the staff and cannot guarantee safety. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: how to adjust the track chute at the source to achieve the same length as the working face, avoid adding or removing supports during mining, thereby reducing the labor intensity of workers and ensuring safe and efficient mining of the working face.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: including a working face, a transport chute, a track chute, an opening eye, and a closed wall.

[0007] S1, calculate the size of the protective coal pillar of the system roadway, determine the initial expected withdrawal line position of the working face, and determine the strike length and dip length of the working face in combination with the opening hole position;

[0008] S2: Determine the construction location of the transport chute gate, design the production system of the transport chute working face, and determine the location of the coal point;

[0009] S3, determine the expected closing position of the transport chute based on the distance between the coal point and the closed wall construction;

[0010] S4: Draw the first section line perpendicular to the transport chute at the expected closing position of the transport chute. Determine the position of the track chute on the inclination according to the inclination length of the working face. Project it onto the plane to determine the construction position of the track chute gate. Design the production system of the track chute working face and determine the location of the coal point.

[0011] S5: Determine the estimated closing position of the trackway based on the distance between the coal point and the closed wall construction;

[0012] S6, determining the final estimated closing line position based on the estimated closing positions of the transport chute and the track chute;

[0013] S7, with the expected closing line as the first section, make a section every 50 meters in the excavation direction of the transport drift, each section intersecting the centerline of the transport drift and the centerline of the track drift. The total number of sections is determined according to the strike length, and the centerline of the cut hole is the location of the last section;

[0014] S8, calculating the elevation of the intersection of the cross section with the center lines of the transport drift and the track drift based on the elevation of the coal seam floor contour line, inversely calculating the average inclination of the cross section coal seam based on the elevation difference between the two intersection points, calculating the projected position of the center line of the track drift using the inclination and the determined working face dip length, and determining a new intersection point with the cross section;

[0015] S9, repeat the above steps to calculate the intersection points of each section and the track trench centerline of the equal-length working surface, connect all the intersection points to form a new track trench excavation centerline, and carry out construction according to the new excavation centerline.

[0016] The present application determines the strike length and dip length of the working face, calculates the size of the system tunnel protection coal pillar, thereby determining the initial expected closing line position of the working face, designs the transport chute working face production system according to the construction position of the transport chute gate, determines the expected closing position of the transport chute in combination with the distance between the coal point and the construction of the closed wall, and makes the first section line of the vertical transport chute at its expected closing position, determines the position of the track chute on the dip according to the calculated working face dip length, projects it to the plane to determine the construction position of the track chute gate, designs the track chute working face production system, determines the position of the coal point, determines the expected closing position of the track chute according to the distance between the coal point and the construction of the closed wall, determines the final expected closing line position according to the expected closing position of the transport chute and the track chute, and then uses the expected closing line as the first section, and uses the transport chute as the first section. A section is made every 50m in the excavation direction of the transport chute. Each section intersects with the center line of the transport chute and the center line of the track chute. The total number of sections is determined according to the strike length, and the center line of the cut eye is the location of the last section. Finally, the elevation of the intersection of the section with the center line of the transport chute and the track chute is calculated according to the elevation of the coal seam bottom contour line. The average inclination of the coal seam in the section is calculated based on the height difference between the two intersection points. The plane projection position of the center line of the track chute is calculated by the inclination angle and the determined inclination length of the working face, and its new intersection with the section is determined. The intersection of each section with the center line of the track chute of the equal-length working face is calculated, and all intersections are connected to form a new track chute excavation center line. Construction is carried out according to the new excavation center line. The track chute is adjusted to be equal to the working face, thereby reducing the labor intensity of workers and ensuring safe and efficient mining of the working face.

[0017] Preferably, the transport chute and the track chute are located on both sides of the working surface, a belt conveyor is installed inside the transport chute, and the belt conveyor and the transport chute are constructed in a straight line at the same azimuth angle.

[0018] Preferably, the turning radius of the azimuth adjustment position of the track chute is not less than 30m.

[0019] Advantages: convenient for construction and conducive to the use of later tunnels and equipment.

[0020] Preferably, the construction position of the transport chute is ahead of the construction position of the track chute, and the leading distance is not less than 50m.

[0021] Preferably, a plurality of encrypted measurement points are provided at the front end of the tunnel of the transport chute, and the distance between two encrypted measurement points is 50m.

[0022] Preferably, the plane coordinate system and elevation system of the transport chute and the track chute should be consistent.

[0023] Advantages: It can effectively provide measurement system guarantee for tunneling construction.

[0024] Preferably, the cut eye is located at the starting end of the working face, and a coal mining machine, a chain plate machine and a plurality of fully mechanized mining supports are arranged inside the cut eye.

[0025] Preferably, the number of the fully mechanized mining supports is equal to the sum of the inclined length of the working face and half the width of the transport drift and the track drift, divided by the width of a single support.

[0026] Preferably, the upper and lower starting points of the fully mechanized mining support are based on the centerline positions of the transport chute and the track chute.

[0027] Preferably: the fully mechanized mining support moves toward the position of the working face, and the moving distance is not less than 500 mm so that the support presses the steel belts of the transport chute and the anchor net support of the track chute.

[0028] Advantages: The control of the advance distance between the two drifts during the mining process further eliminates errors, greatly improving the practicality of this application.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows: the present application determines the strike length and dip length of the working face, calculates the size of the system tunnel protection coal pillar, thereby determining the initial expected closing line position of the working face, designs the transport chute working face production system according to the construction position of the transport chute gate, determines the expected closing position of the transport chute in combination with the distance between the coal point and the construction of the closed wall, and makes the first section line of the transport chute perpendicular to its expected closing position, determines the position of the track chute on the dip according to the calculated working face dip length, projects it to the plane to determine the construction position of the track chute gate, designs the track chute working face production system, determines the position of the coal point, determines the expected closing position of the track chute according to the distance between the coal point and the construction of the closed wall, determines the final expected closing line position according to the expected closing positions of the transport chute and the track chute, and then takes the expected closing line as the first section, makes a section every 50m in the excavation direction of the transport chute, each section intersects with the center line of the transport chute and the center line of the track chute, and determines the total according to the strike length. The number of sections, the center line of the cut eye is the location of the last section, and finally the elevation of the intersection of the section and the transport drift and the track drift center line is calculated according to the elevation of the coal seam bottom contour line. The average inclination of the section coal seam is calculated based on the height difference of the two intersection points. The center line plane projection position of the track drift is calculated by the inclination angle and the determined working face inclination length, and its new intersection with the section is determined. The intersection of each section and the track drift center line of the equal length working face is calculated, and all intersections are connected to form a new track drift excavation center line. According to the new The invention starts from the design source and realizes the arrangement of equal-length working faces through elevation control and construction orientation adjustment, supplemented by track transportation and mining direction adjustment to eliminate the difference, so as to avoid the unequal length of working faces caused by geological conditions and the problem of adding and reducing supports during mining, eliminates the safety problems caused by adding and reducing supports, reduces the impact of adding and reducing supports on the normal production of the working face, and realizes the method of equal length with the working face by adjusting the direction of the track chute, thereby reducing the labor intensity of workers and ensuring the safe and efficient mining of the working face. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of a top-down cross-sectional structure of a working surface according to a method for constructing an equal-length working surface under complex geological conditions according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the cross-sectional and front view structure of a working face according to an embodiment of the present invention, in a method for constructing an equal-length working face under complex geological conditions.

[0032] In the figure: 1-working face; 11-section; 2-transport chute; 3-track chute; 4-opening eye; 5-enclosing wall. DETAILED DESCRIPTION

[0033] To facilitate those skilled in the art to understand the technical solution of the present invention, the technical solution of the present invention is further described with reference to the accompanying drawings.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0035] See Figure 1 This embodiment discloses a method for constructing an equal-length working face under complex geological conditions, including a working face 1, a transport chute 2, a track chute 3, an opening 4, and a closed wall 5.

[0036] See also Figure 1-2 The working face 1 is composed of a plurality of tunnels with different elevations. The working face 1 is provided with a number of sections 11 at equal intervals, and the interval between each two sections 11 is 50m.

[0037] The transport chute 2 is located on one side of the working surface 1. A belt conveyor is installed inside the transport chute 2, and the belt conveyor and the transport chute 2 are constructed in a straight line at the same azimuth angle. Considering production needs, turns should be minimized to improve production efficiency.

[0038] In this embodiment, when the track chute 3 needs to turn, the turning radius of its azimuth adjustment position is not less than 30m, which effectively facilitates the construction of the workers and is beneficial to the use of the subsequent tunnels and equipment.

[0039] In this embodiment, the section 11 is located at the expected collection line position of the transport chute 2, and the first section 11 is formed perpendicular to the transport chute 2. The position of the track chute 3 on the inclination is determined according to the inclination length of the working face 1, and then the plane position of the track chute 3 is determined by projecting it onto the plane. Each section 11 intersects with the center line of the transport chute 2 and the center line of the track chute 3, and the total number of sections 11 is determined according to the strike length.

[0040] The construction position of transport chute 2 is ahead of the construction position of track chute 3, and the leading distance is not less than 50m. Several encrypted measurement points are set at the front end of the tunnel of transport chute 2, and the interval between two encrypted measurement points is 50m. At the same time, the elevation points should be encrypted at the place where the tunnel slope changes, which effectively provides measurement system guarantee for the equal length of excavation construction.

[0041] In this embodiment, the plane coordinate system and elevation system of the transport chute 2 and the track chute 3 must be consistent. During the excavation construction, the inclination of the coal seam actually exposed by the transport chute 2 and the track chute 3, including the inclination of the coal seam along the roadway direction, must be accurately controlled. When it is found that its slope is significantly different from the corresponding slope of the transport chute 2, the roadway elevation must be measured in time. At the same time, the elevation of the intersection of the section 11 and the centerline of the transport chute 2 and the track chute 3 is calculated based on the elevation of the coal seam bottom contour line. The average inclination of the coal seam in the section 11 is calculated based on the height difference between the two intersections. The centerline plane projection position of the track chute 3 is calculated by the inclination and the determined inclination length of the working face 1, and its new intersection with the section 11 is determined. The inclined length of the working face is calculated in time, and according to the geological prediction of the roadway ahead, an adjustment plan for the construction orientation of the track chute is prepared, and the line is re-laid out in time for construction, effectively improving the geological measurement guarantee for the excavation construction, and facilitating construction and facilitating the use of later roadways and equipment.

[0042] In this embodiment, if the actual working face length becomes smaller, the pseudo inclination of the working face can be adjusted by adjusting the advance distance of the transport chute 2 or the track chute 3, thereby increasing the working face length and further eliminating the control error of the advance distance of the two chute.

[0043] The cutting eye 4 is set at the starting end of the working face 1. A coal mining machine, a chain plate machine and several fully mechanized mining supports are arranged inside the cutting eye 4. The number of fully mechanized mining supports is equal to the inclination length of the working face 1 plus half the width of the transport chute 2 and the track chute 3, and then divided by the width of a single support, so that the number of required supports can be calculated in advance.

[0044] In this embodiment, the upper and lower starting points of the bracket are arranged according to the centerline position of the chute. When the working face is advanced, the bracket can be adjusted toward the working face to reduce its width in the transport chute 2 and the track chute 3, thereby adjusting the actual working face length caused by the fluctuation of the inclination angle. However, the adjustment range is such that the bracket presses the steel belt of the chute anchor net support by no less than 500mm, which further eliminates the error and effectively improves the practicality of this application.

[0045] In this embodiment, if the actual working face length becomes smaller, the pseudo inclination of the working face can be adjusted by adjusting the advance distance of the transport chute 2 or the track chute 3, thereby increasing the working face length.

[0046] The closed wall 5 is set on both sides of the working face 1 at the front end of the first section 11. By making the size of the protective coal pillar of the expected collection line system roadway correspond to and setting it outside the coal-seeking point in the drift, the construction position of the closed wall during the collection of the working face must also be considered, so that the distance from the coal-seeking point to the expected collection line is greater than the distance between the closed wall 5 and the first section 11, so as to judge whether the position of the expected collection line is reasonable.

[0047] The working principle of this embodiment is: the staff determines the strike length and dip length of the working face 1, calculates the size of the protective coal pillar in the system tunnel, and thus determines the initial expected closing line position of the working face 1, designs the transport chute working face production system according to the construction position of the transport chute 2 door, determines the expected closing position of the transport chute 2 in combination with the construction distance between the coal point and the closed wall 5, and makes the first section line of the transport chute 2 perpendicular to its expected closing position, determines the position of the track chute 3 on the dip according to the calculated working face 1 dip length, projects it to the plane to determine the construction position of the track chute 3 door, designs the track chute 3 working face production system, determines the position of the coal point, determines the expected closing position of the track chute 3 according to the construction distance between the coal point and the closed wall 5, and determines the final expected closing position according to the expected closing positions of the transport chute and the track chute 3. The position of the withdrawal line is determined, and the expected withdrawal line is taken as the first section 11. A section 11 is made every 50m in the direction of transport drift excavation. Each section 11 intersects with the center line of the transport drift 2 and the center line of the track drift 3. The total number of sections 11 is determined according to the strike length, and the center line of the opening eye 4 is the location of the last section. Finally, the elevation of the intersection of section 11 with the center line of the transport drift 2 and the track drift 3 is calculated according to the elevation of the coal seam bottom contour line. The average inclination of the coal seam in section 11 is calculated based on the height difference between the two intersections. The plane projection position of the center line of the track drift is calculated by the inclination angle and the determined inclination length of the working face 1, and its new intersection with the section is determined. The intersection of each section 11 with the center line of the track drift 3 of the equal-length working face 1 is calculated, and all intersections are connected to form a new track drift 3 excavation center line. Construction is carried out according to the new excavation center line. The present invention starts from the design source, and realizes the arrangement of equal-length working faces through elevation control and construction orientation adjustment, supplemented by rail transportation and mining direction adjustment to eliminate differences, so as to avoid the unequal length of working faces caused by geological conditions and the problem of adding and reducing supports during mining, eliminates the safety problems caused by adding and reducing supports, and reduces the impact of adding and reducing supports on the normal production of the working face. The direction adjustment of the track chute realizes the same length as the working face, thereby reducing the labor intensity of workers and ensuring safe and efficient mining of the working face.

[0048] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description. It is intended that all variations within the meaning and range of equivalents of the claims be embraced herein, and any reference signs in the claims should not be construed as limiting the claims to which they relate.

[0049] The above-mentioned embodiments merely represent the implementation methods of the invention. The protection scope of the present invention is not limited to the above-mentioned embodiments. For those skilled in the art, several variations and improvements can be made without departing from the concept of the present invention, which all fall within the protection scope of the present invention.

Claims

1. A method for constructing an equal-length working face under complex geological conditions, characterized by: It includes a working face (1), a transport chute (2), a track chute (3), an opening eye (4), and a closed wall (5). S1, calculating the size of the protective coal pillar of the system roadway, determining the initial expected closing line position of the working face (1), and determining the strike length and dip length of the working face (1) in combination with the position of the cut hole (4); S2, determine the construction location of the transport chute (2) gate, design the production system of the transport chute (2) working face, and determine the location of the coal point; S3, according to the distance between the coal point and the construction of the closed wall (5), determine the expected closing position of the transport chute (2); S4, at the expected collection line position of the transport chute (2), make the first section line perpendicular to the transport chute (2), determine the position of the track chute (3) on the inclination according to the inclination length of the working face, project it onto the plane to determine the construction position of the gate of the track chute (3), design the production system of the working face of the track chute (3), and determine the position of the coal point; S5, determining the expected closing position of the track chute (3) based on the distance between the coal point and the closed wall (5); S6, determining the final estimated closing line position based on the estimated closing positions of the transport chute (2) and the track chute (3); S7, taking the expected closing line as the first section (11), making a section (11) every 50m in the excavation direction of the transport chute (2), each section (11) intersecting with the center line of the transport chute (2) and the center line of the track chute (3), and determining the total number of sections (11) according to the strike length, and the center line of the opening eye (4) being the location of the last section (11); S8, calculating the elevation of the intersection of the cross section (11) with the transport drift (2) and the track drift (3) according to the elevation of the coal seam bottom contour line, inversely calculating the average inclination of the coal seam in the cross section (11) according to the height difference between the two intersections, calculating the projection position of the center line plane of the track drift (3) by the inclination and the determined inclination length of the working face (1), and determining the new intersection point with the cross section (11); S9, repeat the above steps to calculate the intersection of each section (11) and the center line of the track chute (3) of the equal length working surface (1), connect all the intersections to form a new track chute (3) excavation center line, and carry out construction according to the new excavation center line.

2. The method for constructing an equal-length working face under complex geological conditions according to claim 1, characterized in that: The transport chute (2) and the track chute (3) are located on both sides of the working surface (1). A belt conveyor is installed inside the transport chute (2), and the belt conveyor and the transport chute (2) are constructed in a straight line at the same azimuth angle.

3. The method for constructing an equal-length working face under complex geological conditions according to claim 1, characterized in that: The turning radius of the azimuth adjustment position of the track chute (3) is not less than 30m.

4. The method for constructing an equal-length working face under complex geological conditions according to claim 1, characterized in that: The position of the transport chute (2) is ahead of the position of the track chute (3), and the leading distance is not less than 50m.

5. The method for constructing an equal-length working face under complex geological conditions according to claim 1, characterized in that: A plurality of encrypted measurement points are provided at the front end of the lane of the transport chute (2), and the distance between two encrypted measurement points is 50m.

6. The method for constructing an equal-length working face under complex geological conditions according to claim 1, characterized in that: The plane coordinate system and elevation system of the transport chute (2) and the track chute (3) must be kept consistent.

7. The method for constructing an equal-length working face under complex geological conditions according to claim 1, characterized in that: The cutting eye (4) is located at the starting end of the working face (1), and a coal mining machine, a chain plate machine and a plurality of fully mechanized mining supports are arranged inside the cutting eye (4).

8. The method for constructing an equal-length working face under complex geological conditions according to claim 7, characterized in that: The number of the fully mechanized mining supports is equal to the sum of the inclined length of the working face (1) and half the width of the transport chute (2) and the track chute (3), divided by the width of a single support.

9. The method for constructing an equal-length working face under complex geological conditions according to claim 8, characterized in that: The upper and lower starting points of the fully mechanized mining support are based on the centerline positions of the transport chute (2) and the track chute (3).

10. The method for constructing an equal-length working face under complex geological conditions according to claim 9, characterized in that: The fully mechanized mining support moves toward the position of the working face (1), and the moving distance is not less than 500 mm so that the support presses the steel belts of the anchor net support of the transport chute (2) and the track chute (3).

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