Method for determining calculation range of gas resource quantity in coal seam group mining influence space

Abstract

The invention relates to a method for determining a calculation range of gas resource quantity in a coal seam group mining influence space, which relates to the technical field of mining and specifically comprises the following steps of: judging whether gas in any section of coal seam mining influence space circulates or not under a coal seam group mining condition; if yes, accumulating the calculation range of the gas resource quantity in the mining influence space of each coal seam and subtracting the calculation range of the gas resource quantity in the overlapping region to obtain the calculation range of the gas resource quantity in the mining influence space of the corresponding block section; if not, the gas resource quantity calculation range in the mining influence space of each coal seam is determined and accumulated, and the gas resource quantity calculation range in the mining influence space of the corresponding block section is obtained; and finally, accumulating the calculation ranges of the gas resource quantities in the mining influence spaces of all the blocks to obtain the calculation range of the gas resource quantities in the research area. According to the method, mine production materials can be better utilized, so that the calculation range of the gas resource quantity is determined, and a theoretical basis is provided for efficient utilization of gas resources.

Description

Technical Field

[0001] The present invention relates to the field of mining technology, and in particular to a method for determining a calculation range of gas resources in a space affected by coal seam mining under coal seam group mining conditions. Background Art

[0002] Coalbed methane, called coal mine gas in coal mine production, is mainly composed of methane and is a clean and efficient energy source. The development and utilization of coalbed methane resources is of great significance in increasing energy, improving energy structure, protecting the environment and promoting safe production in coal mines. The development methods of coalbed methane include: surface development of coalbed methane before coal mining, underground gas extraction combined with coal mine production, and gas development in closed / abandoned mines. According to a report by Yuan Liang et al.: Among my country's coal production capacity, some mines have reached their life cycle or do not meet safety production requirements, or have high mining costs, resulting in serious losses. However, directly closing or abandoning such mines will not only cause a huge waste of resources, but may also induce subsequent safety, environmental and social problems. Therefore, the development of gas resources in closed / abandoned mines has received more and more attention.

[0003] Determining the calculation range of gas resources within the space affected by coal seam mining is the basis for gas development in closed / abandoned mines. Liu Feiyue and others pointed out that the available underground space resources of closed coal mines can be estimated in combination with the production capacity and proportional coefficient of closed coal mines. However, gas not only stays in the underground space, but also migrates outward along mining cracks. Although there is rich experience in determining the calculation range of gas resources in a single coal seam, for a group of coal seams, the mining influence zones of each coal seam may overlap with each other. The calculation range of gas resources is different from that of a single coal seam, and is also different from the simple addition of the calculation ranges of several coal seams.

[0004] In the past, little attention has been paid to the space affected by mining, and research directions have often focused on the calculation and prediction of the two-zone height before coal seam mining. Existing research can only estimate the underground space resources, and the calculation method is a simple multiplication of the coal mine production capacity and a certain proportional coefficient. After the coal seam mining is completed, especially under the conditions of coal seam groups, there is little research on how to determine the calculation range of gas resources in the space affected by mining. Summary of the invention

[0005] The object of the present invention is to provide a method for determining the calculation range of gas resources in the mining-affected space under the conditions of coal seam group mining.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A method for determining the calculation range of gas resources in a space affected by coal seam group mining, the method comprising:

[0008] Determine whether the gas in any section of the coal seam mining-affected space under the coal seam group mining conditions flows, and obtain the first determination result;

[0009] If the first judgment result is yes, there is an overlapping area in the mining influence space of adjacent coal seams; determine the calculation range of gas resources in the mining influence space of each coal seam and the calculation range of gas resources in the overlapping area of ​​the mining influence space of adjacent coal seams respectively, add up the calculation range of gas resources in the mining influence space of each coal seam and subtract the calculation range of gas resources in the overlapping area of ​​the mining influence space of adjacent coal seams, and obtain the calculation range of gas resources in the mining influence space of the corresponding block under the mining condition of coal seam group;

[0010] If the first judgment result is no, the mining influence spaces of adjacent coal seams are independent of each other; the calculation range of gas resources in the mining influence space of each coal seam is determined respectively and accumulated to obtain the calculation range of gas resources in the mining influence space of the corresponding block under the mining condition of the coal seam group;

[0011] The calculation range of gas resources in the space affected by mining of all blocks under the conditions of coal seam group mining is accumulated to obtain the calculation range of gas resources in the space affected by mining of coal seam group.

[0012] Optionally, judging whether gas is flowing in the space affected by mining in any section of coal seam under the mining conditions of coal seam group specifically includes:

[0013] Obtain the upper boundary height and lower boundary depth of each coal seam in any block under the coal seam group mining conditions, as well as the distance between adjacent coal seams;

[0014] Determine whether the sum of the lower boundary depth of the shallower coal seam and the upper boundary height of the deeper coal seam in the adjacent coal seams is greater than the distance between the adjacent coal seams, and obtain a second determination result;

[0015] If the second judgment result is yes, then the mining of the adjacent coal seam affects the gas circulation in the space;

[0016] If the second judgment result is no, then the gas does not circulate in the space affected by mining of adjacent coal seams.

[0017] Optionally, the determination of the calculation range of gas resources in the mining impact space of each coal seam specifically includes:

[0018] Determine whether the working face of the coal seam is continuous, and obtain a third determination result;

[0019] If the third judgment result is yes, the continuous working face is regarded as the whole working face, and the calculation range of the gas resource in the mining influence space of the whole working face is calculated to obtain the calculation range of the gas resource in the mining influence space of the corresponding coal seam;

[0020] If the third judgment result is no, then the calculation range of the gas resource quantity in the mining influence space of all single working faces is accumulated to obtain the calculation range of the gas resource quantity in the mining influence space of the corresponding coal seam.

[0021] Optionally, the calculation scope of gas resources in the mining-affected space of a single working face may include:

[0022] The boundary angle of a single working face, the heights of the caving zone and the fissure zone, the depth of the bottom plate water-conducting damage zone and the length of the working face are obtained, and the calculation range of the gas resources in the mining influence space of a single continuous working face is calculated.

[0023] Optionally, the boundary angles include: an uphill boundary angle, a downhill boundary angle, a bottom plate upward critical angle and a bottom plate downward critical angle; the position determined by the uphill boundary angle is the left boundary above the coal seam, and the position determined by the downhill boundary angle is the right boundary above the coal seam; the position determined by the uphill critical angle of the bottom plate is the left boundary below the coal seam, and the position determined by the downhill critical angle of the bottom plate is the right boundary below the coal seam; the heights of the caving zone and the fracture zone are used as the upper boundary height, and the depth of the bottom plate water-conducting damage zone is used as the lower boundary depth.

[0024] Optionally, the calculation scope of gas resources in the space affected by continuous working face mining specifically includes:

[0025] Obtain the heights of the caving zone and the fracture zone of the continuous working face, the depth of the bottom plate water-conducting damage zone and the length of the working face, the uphill boundary angle and the bottom plate upward critical angle of the leftmost working face, and the downhill boundary angle and the bottom plate downward critical angle of the rightmost working face. Take the heights of the caving zone and the fracture zone as the upper boundary height, and the depth of the bottom plate water-conducting damage zone as the lower boundary depth. The position determined by the uphill boundary angle of the leftmost working face is the left boundary above the coal seam, the position determined by the downhill boundary angle of the rightmost working face is the right boundary above the coal seam, the position determined by the uphill critical angle of the bottom plate of the leftmost working face is the left boundary below the coal seam, and the position determined by the downhill critical angle of the bottom plate of the rightmost working face is the right boundary below the coal seam. Calculate the calculation range of gas resources in the mining influence space of the corresponding continuous working face.

[0026] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0027] The present invention can make better use of mine production data, thereby determining the calculation range of gas resources in the space affected by coal seam mining under the conditions of coal seam group mining in abandoned mines, and providing a theoretical basis for the efficient utilization of gas resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 A diagram for determining the calculation range of gas resources in the mining-affected space of a single working face of a coal seam in the present invention;

[0030] Figure 2 It is a determination diagram of the calculation range of gas resource quantity in the mining influence space of multiple working faces in a single coal seam in the present invention;

[0031] Figure 3 It is a judgment diagram of gas flowability in the space affected by mining of four coal seams under the coal seam group mining conditions of the present invention;

[0032] Figure 4 It is a judgment diagram of gas flowability in the space affected by mining of eight coal seams under the coal seam group mining condition of the present invention;

[0033] Figure 5 A schematic flow chart of a method for determining a calculation range of gas resources in a space affected by coal seam group mining provided by an embodiment of the present invention;

[0034] Figure 6 A diagram for determining the calculation range of gas resources in a certain coal seam mining-affected space under the coal seam group mining conditions of the present invention;

[0035] Figure 7 It is a calculation diagram of a method for determining the calculation range of gas resources in a certain block of coal seam mining-affected space under the coal seam group mining conditions in the present invention;

[0036] Figure 8 It is a three-dimensional schematic diagram of the calculation range of gas resources in a certain coal seam mining influence space under the coal seam group mining conditions in the present invention. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The terms "first", "second", "third" and the like (if any) in the description and claims of the present invention and the above drawings are used to distinguish similar objects and are not necessarily used to describe a particular sequence or order.

[0039] The object of the present invention is to provide a method for determining the calculation range of gas resources in the mining-affected space under the conditions of coal seam group mining.

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] In a specific embodiment, the present invention provides a method for determining the calculation range of gas resources in the mining-affected space of a single working face of a coal seam. Figure 1 The corresponding determination diagram is shown.

[0042] After coal seam mining, the height H of the caving zone and the fracture zone can be obtained. 上 , uphill boundary angle γ, downhill boundary angle β, depth of bottom plate water conduction damage zone H 下 , the upward critical angle δ of the bottom plate, the downward critical angle θ of the bottom plate; based on this, the longitudinal section range of the space affected by the working face mining can be circled in AutoCAD.

[0043] The space where the caving zone and the fracture zone are located is also the space for gas migration, and the heights of the two zones are taken as the upper boundaries; the space where the bottom plate water-conducting damage zone is located is also the space where gas can migrate, so the depth of the bottom plate water-conducting damage zone is taken as the lower boundary; the position determined by the uphill boundary angle γ is the left boundary above the coal seam, and the position determined by the downhill boundary angle β is the right boundary above the coal seam; the position determined by the uphill critical angle δ of the bottom plate is the left boundary below the coal seam, and the position determined by the downhill critical angle θ of the bottom plate is the right boundary below the coal seam.

[0044] The above determines the longitudinal section range of the mining-affected space. The product of the area of ​​this longitudinal range and the length of the working face is the calculation range of the working face.

[0045] The method for determining the calculation range of gas resources in the mining-affected space of a single working face in a coal seam is as follows:

[0046] V 单 =SL

[0047] Among them, V 单 is the calculation range of gas resources in the mining-affected space of a single working face, m 3 ; S is the longitudinal section range of the space affected by mining at the coal seam working face, m 2 ; L is the length of the coal seam working face, m.

[0048] by Figure 3 For example, according to the mine production data, the working face length L, inclination angle α, and the height H of the two zones of the caving zone and the fracture zone can be determined for the D13 coal seam (hereinafter referred to as D13, and so on) I and II working faces, D11 III and IV working faces, D08 V working face and D07 VI working face. 上 , the uphill boundary angle γ, the downhill boundary angle β, and the depth H of the bottom plate water conduction damage zone 下 , the upward critical angle δ of the bottom plate and the downward critical angle θ of the bottom plate can be used to circle the longitudinal section range of the space affected by the working face mining in AutoCAD.

[0049] I The longitudinal range of the working surface is 9.45×10 4 m 2 , and the length of the working face 275m is the calculation range of the working face, which is 2.60×10 7 m 3 .

[0050] II The longitudinal extent of the working surface is 10.81×10 4 m 2 , and the product of the working face length of 232m is the calculation range of the working face, which is 2.51×10 7 m 3 .

[0051] III The longitudinal extent of the working surface is 9.40×10 4 m 2 , and the product of the working face length of 272m is the calculation range of the working face, which is 2.56×10 7 m 3 .

[0052] The longitudinal area of ​​the IV working surface is 1.11×10 4 m 2 , and the product of the working face length 261m is the calculation range of the working face, which is 2.90×10 7 m 3 .

[0053] The longitudinal area of ​​the V working surface is 6.86×10 4 m 2 , and the product of the working face length 214m is the calculation range of the working face, which is 1.47×10 7 m 3 .

[0054] The longitudinal area of ​​the VI working surface is 6.86×10 4 m 2 , and the product of the working face length 199m is the calculation range of the working face, which is 1.36×10 7m 3 .

[0055] In a specific embodiment, the present invention provides a method for determining the calculation range of gas resources in a space affected by mining at multiple working faces in a single coal seam.

[0056] For a certain coal seam, there may be multiple working faces. If the mining influence spaces of different working faces do not overlap each other, the range of gas resources in the mining influence spaces of all independent working faces should be calculated separately and added up to obtain the calculation range of gas resources in the mining influence space of the corresponding coal seam.

[0057] V 多 =V1+V2+V3

[0058] Among them, V 多 V1 is the calculation range of gas resources in the mining influence space of multiple independent working faces in a single coal seam, m3; V2 is the calculation range of gas resources in the mining influence space of the first working face, m 3 ; V2 is the calculation range of gas resources in the second mining-affected space, m 3 ; V3 is the calculation range of gas resources in the mining-affected space of the third working face, m 3 .

[0059] Figure 3 In D11, the mining influence spaces defined by the two working faces do not overlap and can be calculated as independent spaces; that is, the calculation range of gas resources in the mining influence space of D11 is the direct addition of the calculation ranges of the two working faces, that is, the calculation range of gas resources in the mining influence space of the two working faces III and IV in D11 is V 11 =V III +V IV , 5.45×10 7 m 3 .

[0060] Among them, V 11 The calculation range of gas resources in the space affected by mining at multiple working faces of D11, m 3 ; V III The calculation range of gas resources in the mining-affected space of the III working face, m 3 ; V IV The calculation range of gas resources in the mining-affected space of the IV working face, m 3 .

[0061] Figure 2The figure shows the determination of the calculation range of gas resources in the mining-affected space of a single coal seam continuous working face. For a continuous working face, the heights of the caving zone and the fracture zone are taken as the upper boundary; the depth of the floor water-conducting damage zone is taken as the lower boundary; the position determined by the uphill boundary angle γ1 of the leftmost working face is the left boundary above the coal seam, and the position determined by the downhill boundary angle β3 of the rightmost working face is the right boundary above the coal seam; the position determined by the uphill critical angle δ1 of the floor of the leftmost working face is the left boundary below the coal seam, and the position determined by the downhill critical angle θ3 of the floor of the rightmost working face is the right boundary below the coal seam. Based on this, the longitudinal section range of the mining-affected space of the working face can be delineated in AutoCAD, and the product of the area of ​​the section range and the length of the working face is the calculation range of the entire working face of a single coal seam.

[0062] In a specific embodiment, the present invention provides a method for determining the gas flowability in a space affected by mining of adjacent coal seams under coal seam group mining conditions:

[0063] Obtain the upper boundary height and lower boundary depth of each coal seam in any section under the coal seam group mining conditions, as well as the distance between adjacent coal seams; determine whether the sum of the lower boundary depth of the shallower coal seam and the upper boundary height of the deeper coal seam in the adjacent coal seams is greater than the distance between the adjacent coal seams; if so, the mining of the adjacent coal seams affects the gas circulation in the space; if not, the mining of the adjacent coal seams does not affect the gas circulation in the space.

[0064] by Figure 3 Take four coal seams under the mining conditions of coal seam groups as an example for analysis. In the process of geological exploration and production, the distance between each coal seam can be obtained. Let the distance between two adjacent coal seams be H.

[0065] D13 H 下 10 meters, D11 H 上 is 80 meters, the distance H between D13 and D11 is 70 meters, H 上 +H 下 =80+10=90>H=70, the mining impact areas of D13 and D11 are superimposed on each other, and the gas can flow between them, so they can be merged into one calculation range.

[0066] D08 H 下 8 meters, D07 H 上 is 60 meters, the distance H between D08 and D07 is 30 meters, H 上 +H 下 =60+8=68>H=30, the mining influence areas of D08 and D07 are superimposed on each other, and the gas can flow between them, so they can also be merged into one calculation range.

[0067] D11 H下 is 7 meters, the H of D08 上 is 55 meters, the distance H between D11 and D08 is 120 meters, H 上 +H 下 = 55 + 7 = 62 < H = 120, then the mining - affected areas of D11 and D08 are independent of each other, and the gas cannot flow between them, so they cannot be combined into one calculation range.

[0068] Taking Figure 4 the mining conditions of four coal seams in a coal seam group as an example for analysis.

[0069] The H of D15 下 is 9 meters, the H of D13 上 is 70 meters, the distance H between D15 and D13 is 20 meters, H 上 +H 下 = 70 + 9 = 79 > H = 20, then the mining - affected areas of D15 and D13 overlap, and the gas can flow between them, so D15 can be combined with D13 and D11 into one calculation range.

[0070] The H of D07 下 is 8 meters, the H of D06 上 is 55 meters, the distance H between D15 and D13 is 20 meters, H 上 +H 下 = 55 + 8 = 63 > H = 20, then the mining - affected areas of D07 and D06 overlap, and the gas can flow between them, so D06 can be combined with D08 and D07 into one calculation range.

[0071] For D06 and D03, the H of D06 下 is 4 meters, the H of D03 上 is 75 meters, the distance H between D06 and D03 is 120 meters, H 上 +H 下 = 75 + 4 = 79 < H = 120, then the mining - affected areas of D06 and D03 are independent of each other, and the gas cannot flow between them, so they cannot be combined into one calculation range.

[0072] The H of D03 下 is 10 meters, the H of D01 上 is 65 meters, the distance H between D03 and D01 is 12 meters, H 上 +H 下 = 65 + 10 = 75 > H = 12, then the mining - affected areas of D03 and D01 overlap, and the gas can flow between them, so they can be combined into one calculation range.

[0073] In view of the different gas flow properties in the space affected by mining of adjacent coal seams under coal seam group mining conditions, the present invention accordingly proposes a method for determining the calculation range of gas resources in the space affected by mining of any block of coal seams under coal seam group mining conditions. The flowchart of the method is as follows: Figure 5 shown.

[0074] If adjacent coal seams are connected up and down, there will be overlapping areas in the mining influence spaces of adjacent coal seams, which can be merged into one block. The corresponding range determination method is: separately determine the gas resource calculation range within the mining influence space of each coal seam and the gas resource calculation range in the overlapping area of ​​the mining influence space of adjacent coal seams, add up the gas resource calculation range within the mining influence space of each coal seam and subtract the gas resource calculation range in the overlapping area of ​​the mining influence space of adjacent coal seams, and obtain the gas resource calculation range within the mining influence space of the corresponding block under the conditions of coal seam group mining.

[0075] If adjacent coal seams are not connected up and down, the mining influence spaces of adjacent coal seams are independent of each other and can be divided into two blocks. The corresponding range determination method is: determine the calculation range of gas resources in the mining influence space of each coal seam respectively and accumulate them to obtain the calculation range of gas resources in the mining influence space of the corresponding block under the conditions of coal seam group mining.

[0076] The calculation range of gas resources in the space affected by mining of all blocks under the conditions of coal seam group mining is accumulated to obtain the calculation range of gas resources in the space affected by mining of coal seam group.

[0077] by Figure 3 Take D13 and D11 in the figure as an example: take the upper boundary of the upper part D13 as the upper boundary of D13 and D11 as a whole, take the lower boundary of the lower part D11 as the lower boundary of D13 and D11 as a whole, take the outer contour on the left side of the figure as the boundary, and take the outer contour on the right side of the figure as the boundary, and get the following Figure 6 The red range shown is the blue range of D13 + the green range of D11 - the yellow range of the overlapping area in the middle. Figure 7 This is a calculation diagram for determining the calculation range of gas resources in a certain block of coal seam mining influence space under coal seam group mining conditions. The calculation range of this block is the blue range of D13 × D13 working face length + D11 green range × D11 working face length - the range of the middle yellow overlapping space × the working face length of the overlapping area. The working face length of the overlapping part of the mining influence space is determined by the intersection starting point coordinates (x1, y1, z1) and the intersection end point coordinates (x2, y2, z2). The three-dimensional schematic diagram is as follows Figure 8 shown.

[0078] The formula for calculating the range of the overlapping area of ​​adjacent coal seam mining impact is:

[0079] V 叠=S 叠 L 叠

[0080] Among them, V 叠 is the calculation range of the overlapping area of ​​adjacent coal seam mining impact, m 3 ; S 叠 is the calculation range of the longitudinal section of the overlapping area of ​​adjacent coal seam mining impact, m 2 ; L 叠 is the length of the working face in the overlapping area of ​​adjacent coal seams, m.

[0081] The formula for calculating the range of coal seam gas resources in the mining-affected space of block 11-13 is:

[0082] V 11-13 =V 11 +V 13 -V 叠11-13

[0083] Among them, V 11-13 The calculation range of gas resources in the space affected by coal mining in the 11-13 block section, m 3 ; V 11 The calculation range of gas resources in the D11 mining-affected space, m 3 ; V 13 The calculation range of gas resources in the D13 mining-affected space, m3; V 叠11-13 The calculation range of the overlapping area of ​​coal seams in blocks 11-13, m 3 .

[0084] From the circled range in AutoCAD, we can know that the calculation range of the overlapping part of the mining-affected space in the 11-13 block segment is 6.10×10 4 m 2 The overlapping length of the gas resource calculation range in the mining-affected space of adjacent coal seams is 186 m, that is, the gas resource calculation range of the overlapping part of the mining-affected space in the 11-13 block section is 1.13×10 7 m 3 Therefore, the calculation range of gas resources in the mining-affected space in the 11-13 block segment is the sum of the calculation ranges of gas resources in the mining-affected spaces of D11 and D13, and the difference between the overlapping parts. The calculation range of gas resources in the mining-affected space in the 11-13 block segment is 9.43×10 7 m 3 .

[0085] Similarly, the formula for calculating the range of coal seam gas resources in the mining-affected space of the 07-08 block section is:

[0086] V 07-08 =V 07+V 08 -V 叠07-08

[0087] Among them, V 07-08 is the calculation range of the gas resource volume in the space affected by coal seam mining in the 07-08 block section, m 3 ; V 07 is the calculation range of the gas resource volume in the space affected by coal seam mining in the D07 coal seam, m 3 ; V 08 is the calculation range of the gas resource volume in the space affected by coal seam mining in the D08 coal seam, m3; V 叠07-08 is the calculation range of the overlapping area of the 07-08 block section coal seams, m 3 .

[0088] From the range delineated in AutoCAD, it can be seen that the calculation range of the overlapping part in the space affected by coal seam mining in the 07-08 block section is 5.11×10 4 m 2 , and the overlapping length of the calculation range of the gas resource volume in the space affected by coal seam mining in adjacent coal seams is 199 m, that is, the calculation range of the gas resource volume in the overlapping part in the space affected by coal seam mining in the 07-08 block section is 1.02×10 7 m 3 . Therefore, the calculation range of the gas resource volume in the space affected by coal seam mining in the 07-08 block section is obtained by summing the calculation ranges of the gas resource volumes in the spaces affected by coal seam mining in D07 and D08 respectively and then subtracting the overlapping part, so as to obtain the calculation range of the gas resource volume in the space affected by coal seam mining in the 07-08 block section as 1.82×10 7 m 3 .

[0089] In a specific embodiment, for the calculation range of the gas resource volume in the space affected by coal seam mining in the entire study area, first determine the calculation range of the gas resource volume in the space affected by coal seam mining in the i-th block section (1 < i < N), and then obtain the calculation range of the gas resource volume in the entire study area after adding them up.

[0090]

[0091] Among them, V 总 is the calculation range of the gas resource volume in the study area, m 3 ; V i is the calculation range of the space affected by coal seam mining in the i-th block section, m 3 ; S i is the longitudinal section range of the space affected by coal seam mining in the i-th block section, m 2 ; L i is the length of the i-th working face, m; S 煤i is the longitudinal section range of the spaces affected by coal seam mining in each coal seam in the i-th block section,; S 叠iis the calculation range of the longitudinal section of the spatial overlap area of ​​the mining impact of the i-th block, m 2 ; L 叠i is the length of the working face in the spatial overlap area affected by coal seam mining in the i-th block, m; N is the total number of blocks in the study area, 1 <i<N。

[0092] by Figure 3 Taking the coal seam in the entire study area as an example, there are two blocks, 07-08 and 11-13, and the calculation formula is:

[0093] V 总 =V 07-08 +V 11-13 =V 07 +V 08 +V 11 +V 13 -V 叠07-08 -V 叠11-13

[0094] Substituting the mine production data, we know that the calculation range of gas resources in D13, D11, D08 and D07 coal seams in the study area is: 1.13×10 8 m 3 .

[0095] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0096] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for determining the calculation range of gas resources in the space affected by coal seam mining, characterized in that: The method comprises: Determine whether the gas in any section of the coal seam mining-affected space under the coal seam group mining conditions flows, and obtain the first determination result; If the first judgment result is yes, there is an overlapping area in the mining influence space of adjacent coal seams; determine the calculation range of gas resources in the mining influence space of each coal seam and the calculation range of gas resources in the overlapping area of ​​the mining influence space of adjacent coal seams respectively, add up the calculation range of gas resources in the mining influence space of each coal seam and subtract the calculation range of gas resources in the overlapping area of ​​the mining influence space of adjacent coal seams, and obtain the calculation range of gas resources in the mining influence space of the corresponding block under the mining condition of coal seam group; If the first judgment result is no, the mining influence spaces of adjacent coal seams are independent of each other; the calculation range of gas resources in the mining influence space of each coal seam is determined respectively and accumulated to obtain the calculation range of gas resources in the mining influence space of the corresponding block under the mining condition of the coal seam group; The calculation range of gas resources in the space affected by mining of all blocks under the conditions of coal seam group mining is accumulated to obtain the calculation range of gas resources in the space affected by mining of coal seam group.

2. The method for determining the calculation range of gas resources in the space affected by coal seam group mining according to claim 1 is characterized in that: The specific methods for judging whether gas is flowing in the space affected by mining in any section of coal seam under the mining conditions of coal seam group include: Obtain the upper boundary height and lower boundary depth of each coal seam in any block under the coal seam group mining conditions, as well as the distance between adjacent coal seams; Determine whether the sum of the lower boundary depth of the shallower coal seam and the upper boundary height of the deeper coal seam in the adjacent coal seams is greater than the distance between the adjacent coal seams, and obtain a second determination result; If the second judgment result is yes, then the mining of the adjacent coal seam affects the gas circulation in the space; If the second judgment result is no, then the gas does not circulate in the space affected by mining of adjacent coal seams.

3. The method for determining the calculation range of gas resources in the space affected by coal seam group mining according to claim 1 is characterized in that: The calculation scope of gas resources in the space affected by mining in each coal seam specifically includes: Determine whether the working face of the coal seam is continuous, and obtain a third determination result; If the third judgment result is yes, the continuous working face is regarded as the whole working face, and the calculation range of the gas resource in the mining influence space of the whole working face is calculated to obtain the calculation range of the gas resource in the mining influence space of the corresponding coal seam; If the third judgment result is no, then the calculation range of the gas resource quantity in the mining influence space of all single working faces is accumulated to obtain the calculation range of the gas resource quantity in the mining influence space of the corresponding coal seam.

4. The method for determining the calculation range of gas resources in the space affected by coal seam group mining according to claim 3 is characterized in that: The calculation scope of gas resources in the mining-affected space of a single working face includes: The boundary angle of a single working face, the heights of the caving zone and the fissure zone, the depth of the bottom plate water-conducting damage zone and the length of the working face are obtained, and the calculation range of the gas resources in the mining influence space of a single continuous working face is calculated.

5. The method for determining the calculation range of gas resources in the space affected by coal seam group mining according to claim 4 is characterized in that: The boundary angles include: an uphill boundary angle, a downhill boundary angle, a bottom plate upward critical angle and a bottom plate downward critical angle; the position determined by the uphill boundary angle is the left boundary above the coal seam, and the position determined by the downhill boundary angle is the right boundary above the coal seam; the position determined by the bottom plate upward critical angle is the left boundary below the coal seam, and the position determined by the bottom plate downward critical angle is the right boundary below the coal seam; the heights of the caving zone and the fracture zone are taken as the upper boundary height, and the depth of the bottom plate water-conducting damage zone is taken as the lower boundary depth.

6. The method for determining the calculation range of gas resources in the space affected by coal seam group mining according to claim 3 is characterized in that: The calculation scope of gas resources in the space affected by continuous working face mining specifically includes: Obtain the heights of the caving zone and the fracture zone of the continuous working face, the depth of the bottom plate water-conducting damage zone and the length of the working face, the uphill boundary angle and the bottom plate upward critical angle of the leftmost working face, and the downhill boundary angle and the bottom plate downward critical angle of the rightmost working face. Take the heights of the caving zone and the fracture zone as the upper boundary height, and the depth of the bottom plate water-conducting damage zone as the lower boundary depth. The position determined by the uphill boundary angle of the leftmost working face is the left boundary above the coal seam, the position determined by the downhill boundary angle of the rightmost working face is the right boundary above the coal seam, the position determined by the uphill critical angle of the bottom plate of the leftmost working face is the left boundary below the coal seam, and the position determined by the downhill critical angle of the bottom plate of the rightmost working face is the right boundary below the coal seam. Calculate the calculation range of gas resources in the mining influence space of the corresponding continuous working face.

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