Grouting partition hole arrangement method for roof caving goaf

Abstract

This disclosure relates to the field of mining grouting technology, and in particular provides a method for grouting zoning and hole layout in roof collapse goaf areas. This method includes: dividing the roof collapse goaf area of ​​the working face into multiple longitudinal regions along its length according to porosity; dividing the roof collapse goaf area of ​​the working face into multiple transverse regions along its width according to porosity; assigning values ​​to the intersection regions of the longitudinal and transverse regions to form multiple assigned regions; and arranging boreholes according to the type of the assigned regions, drilling along the width of the working face from adjacent underground roadways towards the assigned regions. This disclosure, through the rational arrangement of grouting holes, can effectively increase the grouting volume and filling rate of the goaf without affecting coal mining, achieving full filling of the remaining space in the goaf.

Description

Technical Field

[0001] This disclosure relates to the field of mining grouting technology, and in particular to a grouting zone layout method for roof collapse goaf areas. Background Technology

[0002] Grouting and backfilling of coal mine goaf areas can be carried out in various ways depending on the purpose. These include grouting through surface boreholes (for roof collapses or overhangs), backfilling during mining operations, and grouting through boreholes in adjacent underground roadways after roof collapses. Among these methods, the grouting method through boreholes in adjacent underground roadways after roof collapses is becoming increasingly common.

[0003] Existing surface drilling and grouting technologies for goaf areas after roof collapse are often difficult to select freely based on the spatial distribution of the goaf due to the influence of surface topography and obstacles. They are mostly aimed at controlling surface subsidence, and the drilling layout is mainly in the middle of the working face. The cost of land acquisition and coordination for drilling, as well as the cost of long-distance deep hole drilling from the surface to the underground goaf, are generally high. Overall, they are not suitable for multi-point combination drilling based on the spatial distribution of the goaf.

[0004] Furthermore, the location of the final borehole is generally determined by only one factor: the height of the collapse zone. The borehole opening is often placed at the top of the collapse zone, and the depth is often outside the collapsed rock. The borehole layout does not take into account the internal space of the collapsed rock. Moreover, the rock accumulation pattern and internal connectivity in the goaf vary greatly depending on the time of roof collapse, the roof pressure step distance, and the working face width. Therefore, the existing borehole layout methods for old goafs after collapse take few factors into consideration, resulting in poor overall filling rate and efficiency of grouting in the goaf. Summary of the Invention

[0005] This disclosure is made in view of the above-mentioned problems. This disclosure provides a method for grouting zone layout in goaf areas caused by roof collapse.

[0006] According to one aspect of this disclosure, a method for grouting zoning and hole layout in a roof collapse goaf is provided, comprising: dividing the roof collapse goaf of the working face into multiple longitudinal regions along its length direction according to the porosity; dividing the roof collapse goaf of the working face into multiple transverse regions along its width direction according to the porosity; assigning values ​​to the intersection regions of the longitudinal regions and the transverse regions respectively, thereby forming multiple assigned regions; and arranging boreholes according to the type of the assigned regions, drilling from the adjacent underground roadway of the working face towards the assigned regions along the width direction of the working face.

[0007] Furthermore, according to one aspect of this disclosure, a method for grouting zone layout in a collapsed goaf is used to formulate different drilling layout principles for different types of assigned zones, taking into account the particle size of the grouting material and the fluidity and diffusivity in different porosity regions. The principle features include the drilling depth, the borehole opening height, and the drilling spacing.

[0008] Furthermore, according to one aspect of this disclosure, the grouting zone layout method for a roof collapse goaf is used to divide the working face into regions A, B, and C along the length direction according to three time periods: 6 months, 12 months, and more than 1 year of shutdown, with corresponding porosities of high, medium, and low, respectively.

[0009] Furthermore, according to one aspect of the present disclosure, a grouting zone layout method for a roof collapse goaf is used. When the width L of the working face is greater than 1.2 times the coal seam burial depth H of the working face, the mining impact of the working face reaches a sufficient level. The central area where the width L exceeds 1.2 times the coal seam burial depth H is a fully compacted area after the roof collapse, and the two sides are not fully compacted areas. Accordingly, the working face is divided into M region and N region along the width direction, with corresponding high and low porosities, respectively. The N region is located between the two M regions.

[0010] Furthermore, according to one aspect of the present disclosure, the grouting zone layout method for a roof collapse goaf is such that the intersection area formed by region A and region M is a high porosity region, and the intersection area formed by region A and region N is a medium porosity region. The intersection area formed by region B and region M is a region with high porosity, and the intersection area formed by region B and region N is a region with low porosity. The intersection region formed by region C and region M is a region with medium porosity, and the intersection region formed by region C and region N is a region with low porosity.

[0011] Furthermore, according to one aspect of this disclosure, a method for grouting zone layout in a goaf due to roof collapse is provided, along the length of the working face, in the high porosity assigned region, multiple sets of drilling units are provided, the multiple sets of drilling units are distributed on the same side of the high porosity assigned region, and each set of drilling units includes one borehole. The depth of the borehole is such that, along the width direction of the working surface, the borehole opening is located in the middle of the high porosity assignment region; The borehole opening height is such that, along the height direction of the working surface, the borehole opening is located at the top of the high porosity assignment region.

[0012] Furthermore, according to one aspect of this disclosure, the grouting zone layout method for a roof collapse goaf is such that, along the length of the working face, the spacing between any two groups of the drilling units is 3 to 6 times the daily advance speed of the working face, but should be controlled within 50 to 60 meters.

[0013] Furthermore, according to one aspect of this disclosure, a method for grouting zone layout in a goaf due to roof collapse is provided, along the length of the working face, in the porosity assignment region, multiple sets of drilling units are set, the multiple sets of drilling units are distributed on the same side of the porosity assignment region, and each set of drilling units includes two boreholes. The depth of the borehole is: along the width direction of the working surface, the openings of the two boreholes are respectively located at 1 / 3 and 2 / 3 of the width of the porosity assignment area, or both are located in the middle of the porosity assignment area and distributed at different heights; The borehole opening height is: along the height direction of the working surface, the openings of the two boreholes are located in the upper part, or the upper and middle parts of the porosity assignment area.

[0014] Furthermore, according to one aspect of this disclosure, the grouting zone layout method for a roof collapse goaf is such that, along the length of the working face, the spacing between any two groups of the drilling units is 30m to 40m.

[0015] Furthermore, according to one aspect of this disclosure, a method for grouting zone layout in a goaf due to roof collapse is provided, along the length of the working face, in the low porosity assigned area, multiple sets of drilling units are provided, the multiple sets of drilling units are distributed on opposite sides of the low porosity assigned area, and each set of drilling units includes two boreholes. The depth of the borehole is as follows: along the width direction of the working surface, the openings of the two boreholes are located at 1 / 3 and 2 / 3 of the width of the low porosity assignment area, respectively, and are distributed at different heights; The borehole opening height is as follows: along the height direction of the working surface, the openings of the two boreholes are located at the upper and middle parts of the low porosity assignment region.

[0016] Furthermore, according to one aspect of this disclosure, the grouting zone layout method for a roof collapse goaf is such that, along the length of the working face, the spacing between any two groups of the drilling units is 10m to 20m.

[0017] Furthermore, according to one aspect of this disclosure, a method for grouting zoning and hole layout in a roof collapse goaf is provided along the length of the working face, with multiple sets of drilling units arranged on both sides of the working face, the multiple sets of drilling units distributed on opposite sides of the working face, and each set of drilling units including a borehole. The depth of the borehole is such that the borehole opening is located at the edge of the working surface along the width direction of the working surface; The borehole opening height is such that, along the height direction of the working surface, the borehole opening is located at the top of the working surface.

[0018] Furthermore, according to one aspect of this disclosure, the grouting zone layout method for a roof collapse goaf is such that, along the length of the working face, the spacing between any two groups of the drilling units is 50m to 80m.

[0019] According to the grouting zone layout method for goaf with roof collapse according to the embodiments of this disclosure, grouting is performed in the old goaf after mining has ended and the roof has collapsed. The coal mining and grouting processes do not affect each other. Through the reasonable arrangement of grouting holes, the grouting volume and filling rate of the goaf can be effectively increased without affecting the coal mining of the working face, so as to achieve full filling of the remaining space of the goaf.

[0020] It should be understood that both the foregoing general description and the following detailed description are exemplary and intended to provide further illustration of the claimed technology. Attached Figure Description

[0021] The above and other objects, features, and advantages of this disclosure will become more apparent from the more detailed description of the embodiments thereof in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this disclosure and form part of the specification. They are used together with the embodiments of this disclosure to explain the disclosure and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0022] Figure 1 This is a schematic diagram of porosity partitioning along the longitudinal direction of the working surface according to an embodiment of the present disclosure; Figure 2 This is a schematic diagram of the porosity partitioning of the working surface in the transverse direction according to an embodiment of the present disclosure; Figure 3 This is a diagram showing the overall porosity zoning of the working surface according to an embodiment of this disclosure; Figure 4 This is a cross-sectional view of the drilling arrangement on the working face according to an embodiment of the present disclosure; Figure 5 This is a plan view of the drilling layout of the working face according to an embodiment of the present disclosure.

[0023] Explanation of reference numerals in the attached figures: 1: First longitudinal region; 2: Second longitudinal region; 3: Third longitudinal region; 4: First transverse region; 5: Second transverse region; 6: Third transverse region; 7: Surface; 14: First assigned value region; 15: Second assigned value region; 16: Third assigned value region; 24: Fourth assigned value region; 25: Fifth assigned value region; 26: Sixth assigned value region; 34: Seventh assigned value region; 35: Eighth assigned value region; 36: Ninth assigned value region; 141: First borehole; 142: Second borehole; 151: Third borehole; 152: Fourth borehole; 161: Fifth borehole; Drilling holes; 162: Sixth hole; 241: Seventh hole; 242: Eighth hole; 251: Ninth hole; 252: Tenth hole; 253: Eleventh hole; 254: Twelfth hole; 261: Thirteenth hole; 262: Fourteenth hole; 341: Fifteenth hole; 342: Sixteenth hole; 343: Seventeenth hole; 351: Eighteenth hole; 352: Nineteenth hole; 353: Twentieth hole; 354: Twenty-first hole; 361: Twenty-second hole; 362: Twenty-third hole; 363: Twenty-fourth hole. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this disclosure more apparent, exemplary embodiments according to this disclosure will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this disclosure, and not all embodiments of this disclosure. It should be understood that this disclosure is not limited to the exemplary embodiments described herein.

[0025] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0026] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown in the embodiments of this disclosure, a method for grouting zone layout in a roof collapse goaf is provided, including: The collapsed goaf of the working face is divided into multiple longitudinal regions along its length according to the porosity. Figure 1 The diagram shows three longitudinal regions: the first longitudinal region 1, the second longitudinal region 2, and the third longitudinal region 3. The number of longitudinal regions can be changed depending on the actual size of the roof collapse goaf. The collapsed goaf of the working face is divided into multiple transverse regions along its width according to the porosity. Figure 2 The diagram shows three transverse regions: the first transverse region 4, the second transverse region 5, and the third transverse region 6. The number of transverse regions can be changed depending on the actual size of the collapsed goaf. Values ​​are assigned to the intersection areas of the vertical and horizontal regions, thus forming multiple assignment regions. Figure 3 Nine assignment regions are shown, namely the first assignment region 14, the second assignment region 15, the third assignment region 16, the fourth assignment region 24, the fifth assignment region 25, the sixth assignment region 26, the seventh assignment region 34, the eighth assignment region 35, and the ninth assignment region 36. The number of assignment regions can be changed according to the actual size of the roof collapse goaf. Drilling is arranged according to the type of the assigned area. Drilling is carried out along the width of the working face, from the adjacent underground roadway towards the assigned area. The type of the assigned area is related to the porosity of both the transverse and longitudinal regions, and is a result of a combination of both. Figure 4 As shown, drilling is performed in each assigned area. The drilling process parameters and number of holes differ for different types of assigned areas, and are determined according to the type of each assigned area to achieve full filling.

[0027] The grouting zone layout method for goaf areas with roof collapse in this embodiment of the present disclosure is used for grouting in old goaf areas where mining has been completed and the roof has collapsed. The coal mining and grouting processes do not affect each other. Through the reasonable arrangement of grouting holes, the grouting volume and filling rate of the goaf can be effectively increased without affecting the coal mining of the working face, so as to achieve full filling of the remaining space of the goaf.

[0028] In some possible implementations, different drilling layout principles are formulated for different types of assigned areas, taking into account the particle size of the grouting material (the particle size parameter range is 45μm~3mm) and the fluidity and diffusivity in different porosity regions. The principle characteristics include the drilling depth, the borehole opening height, and the drilling spacing.

[0029] Grouting materials exhibit good fluidity and high diffusivity in areas with high porosity, resulting in a faster filling speed. In areas with low porosity, they exhibit lower fluidity and lower diffusivity, resulting in a slower filling speed. In areas with medium porosity, fluidity and diffusivity fall between the two, and the filling speed is moderate.

[0030] For areas with high porosity, the grouting material has good fluidity and a large diffusion range, and the drilling layout principle is shallow holes, large spacing, and high-position hole openings; for areas with low porosity, the drilling layout principle is deep holes, small spacing, and a combination of high, medium, and low-position hole openings.

[0031] In some possible implementations, such as Figure 1 As shown, the working face is divided into regions A, B, and C along its length according to three time periods: 6 months, 12 months, and more than 1 year of shutdown. The corresponding porosities are high, medium, and low, respectively.

[0032] During mining, the roof of the goaf gradually collapses as the working face advances. The longer the collapse occurs, the denser the rock in the goaf becomes under the pressure of the roof, and the lower its porosity. Generally, the roof movement in the goaf stabilizes 1-2 years after the working face is completed, so the working face can be divided along its length according to time. Figure 1 As shown in the figure, the first longitudinal region 1 is region A, where the rock in the goaf is relatively loose and has high porosity; the second longitudinal region 2 is region B, where the rock in the goaf tends to be dense and has medium porosity; and the third longitudinal region 3 is region C, where the rock in the goaf is relatively dense and has low porosity.

[0033] In some possible implementations, such as Figure 2 As shown, when the width L of the working face is greater than 1.2 times the coal seam burial depth H (H is the depth of the coal seam from the surface 7), the mining impact of the working face reaches a sufficient level. The central area (width f) where the width L exceeds 1.2 times the coal seam burial depth H is a fully compacted area after the roof collapses, and the two sides are non-fully compacted areas (width 0.6H). Accordingly, the working face is divided into M region and N region along the width direction, with corresponding porosities of high and low, respectively. N region is located between the two M regions.

[0034] like Figure 2 As shown, the first transverse region 4 is region M, which is a partially compacted area where the rock in the goaf is still relatively loose and has high porosity; the second transverse region 5 is region N, which is a fully compacted area where the rock in the goaf is relatively dense and has low porosity; the third transverse region 6 is region M, which is a partially compacted area where the rock in the goaf is still relatively loose and has high porosity.

[0035] In some possible implementations, such as Figure 3 As shown, the intersection of region A and region M is a region with high porosity, and the intersection of region A and region N is a region with medium porosity. The intersection of region B and region M is a region with high porosity, and the intersection of region B and region N is a region with low porosity. The intersection of region C and region M is the region with a medium porosity value, while the intersection of region C and region N is the region with a low porosity value.

[0036] like Figure 3As shown, the first assigned region 14 is the high porosity assigned region, the second assigned region 15 is the medium porosity assigned region, the third assigned region 16 is the high porosity assigned region, the fourth assigned region 24 is the high porosity assigned region, the fifth assigned region 25 is the low porosity assigned region, the sixth assigned region 26 is the high porosity assigned region, the seventh assigned region 34 is the medium porosity assigned region, the eighth assigned region 35 is the low porosity assigned region, and the ninth assigned region 36 is the medium porosity assigned region. The assignment process is shown in Table 1.

[0037] Table 1. Comprehensive Zoning Assignment Table for Working Surface Gap

[0038] In some possible implementations, such as Figure 4 , Figure 5 As shown, along the length of the working face, multiple sets of drilling units are set in the high porosity assignment area. The multiple sets of drilling units are distributed on the same side of the high porosity assignment area, and each set of drilling units includes one borehole. The drilling depth is: along the width direction of the working face, the borehole opening is located in the middle of the high porosity assignment region; The borehole opening height is: along the height direction of the working face, the borehole opening is located at the top of the high porosity assignment area.

[0039] like Figure 5 As shown, the first assignment area 14 is provided with two sets of drilling units, which are distributed on the same side of the first assignment area 14. Each set of drilling units includes one drill hole, namely the second drill hole 142 in the figure; Figure 4 As shown, along the width direction of the working face, the opening of the second borehole 142 is located in the middle of the first assignment area 14; along the height direction of the working face, the opening of the second borehole 142 is located at the top of the first assignment area 14, and the second borehole 142 is inclined upwards from the adjacent underground roadway of the working face. By arranging the second borehole 142 in this way in the first assignment area 14, the high porosity assignment area can be fully filled.

[0040] The fourth assignment area 24 (setting the eighth borehole 242), the third assignment area 16 (setting the sixth borehole 162), and the sixth assignment area 26 (setting the fourteenth borehole 262) are all high porosity assignment areas. The borehole layout can refer to the first assignment area 14.

[0041] In some possible implementations, such as Figure 4 , Figure 5 As shown, along the length of the working face, the spacing between any two sets of drilling units is 3 to 6 times the daily advance speed of the working face, but should be controlled within 50m to 60m.

[0042] like Figure 5 As shown, the first assignment area 14 is provided with two sets of drilling units. Along the length of the working face, the distance between any two sets of drilling units is S1, where S1 is 3 to 6 times the daily advance speed of the working face, but should be controlled within 50m to 60m. By arranging the second borehole 142 in the first assignment area 14 in this way, the high porosity assignment area can be fully filled.

[0043] The fourth assignment region 24, the third assignment region 16, and the sixth assignment region 26 are all high porosity assignment regions. The drilling layout can refer to the first assignment region 14.

[0044] In some possible implementations, such as Figure 4 , Figure 5 As shown, along the length of the working face, multiple sets of drilling units are set in the porosity assignment area. The multiple sets of drilling units are distributed on the same side of the porosity assignment area, and each set of drilling units includes two boreholes. The drilling depth is as follows: along the width direction of the working face, the openings of the two holes are located at 1 / 3 and 2 / 3 of the width of the porosity assignment area, respectively, or both are located in the middle of the porosity assignment area and distributed at different heights; The borehole opening height is: along the height direction of the working face, the openings of the two boreholes are located in the upper part, or the upper and middle parts of the porosity assignment area.

[0045] like Figure 5 As shown, the second assignment area 15 is provided with two sets of drilling units, which are distributed on the same side of the second assignment area 15. Each set of drilling units includes two holes, namely the third hole 151 and the fourth hole 152 in the figure; Figure 4 As shown, along the width direction of the working face, the openings of the third borehole 151 and the fourth borehole 152 are located in the middle of the second assignment region 15 and distributed at different heights; along the height direction of the working face, the opening of the third borehole 151 is located in the upper part of the second assignment region 15, and the opening of the fourth borehole 152 is located in the middle of the second assignment region 15. Starting from the adjacent underground roadway of the working face, the third borehole 151 and the fourth borehole 152 are inclined upwards as a whole. By arranging the third borehole 151 and the fourth borehole 152 in this way in the second assignment region 15, the assignment region in the porosity can be fully filled.

[0046] The seventh assignment region 34 (containing the sixteenth borehole 342 and the seventeenth borehole 343) and the ninth assignment region 36 (containing the twenty-third borehole 362 and the twenty-fourth borehole 363) are both assignment regions for porosity. The seventh assignment region 34 contains five groups of borehole units, distributed on the same side of the seventh assignment region 34. Each group of borehole units includes two boreholes, namely the sixteenth borehole 342 and the seventeenth borehole 343 in the figure; as shown... Figure 4 As shown, along the width direction of the working face, the opening of the sixteenth borehole 342 is located at 1 / 3 of the width of the seventh assignment area 34, and the opening of the seventeenth borehole 343 is located at 2 / 3 of the width of the seventh assignment area 34. Along the height direction of the working face, the openings of both the sixteenth borehole 342 and the seventeenth borehole 343 are located at the upper part of the seventh assignment area 34. Starting from the adjacent underground roadway of the working face, the sixteenth borehole 342 and the seventeenth borehole 343 are inclined upwards as a whole. The borehole arrangement in the ninth assignment area 36 can refer to the seventh assignment area 34.

[0047] In some possible implementations, such as Figure 4 , Figure 5 As shown, along the length of the working face, the spacing between any two sets of drilling units is 30m~40m.

[0048] like Figure 5 As shown, the second assignment region 15 is provided with two sets of drilling units. Along the length direction of the working face, the distance between any two sets of drilling units is S2, where S2 is 30m~40m. By arranging the third borehole 151 and the fourth borehole 152 in the second assignment region 15 in this way, the assignment region in the porosity can be fully filled.

[0049] The seventh assignment region 34 and the ninth assignment region 36 are both assignment regions for porosity. The borehole layout can refer to the second assignment region 15.

[0050] In some possible implementations, such as Figure 4 , Figure 5 As shown, along the length of the working face, multiple sets of drilling units are set in the low porosity assignment area. The multiple sets of drilling units are distributed on opposite sides of the low porosity assignment area, and each set of drilling units includes two boreholes. The drilling depth is as follows: along the width direction of the working face, the openings of the two boreholes are located at 1 / 3 and 2 / 3 of the width of the low porosity assignment area, respectively, and are distributed at different heights; The borehole opening height is as follows: along the height direction of the working face, the openings of the two boreholes are located in the upper and middle parts of the low porosity assignment region.

[0051] like Figure 5As shown, the fifth assignment region 25 is provided with eight sets of drilling units, which are symmetrically distributed on opposite sides of the fifth assignment region 25. Four sets of drilling units are provided on each side, and each set of drilling units includes two holes, namely the ninth hole 251 and the tenth hole 252 (or the eleventh hole 253 and the twelfth hole 254) in the figure; Figure 4 As shown, along the width direction of the working face, the openings of the ninth borehole 251 and the tenth borehole 252 are located in the middle of the fifth assignment region 25 and distributed at different heights; along the height direction of the working face, the opening of the ninth borehole 251 is located in the upper part of the fifth assignment region 25, and the opening of the tenth borehole 252 is located in the middle of the fifth assignment region 25. Starting from the adjacent underground roadway of the working face, the ninth borehole 251 and the tenth borehole 252 (or the eleventh borehole 253 and the twelfth borehole 254) are inclined upward as a whole. By arranging the ninth borehole 251 and the tenth borehole 252 (or the eleventh borehole 253 and the twelfth borehole 254) in the fifth assignment region 25 in this way, the low porosity assignment region can be fully filled.

[0052] The eighth assignment area 35 (which includes the eighteenth borehole 351, the nineteenth borehole 352, the twentieth borehole 353, and the twenty-first borehole 354) is a low porosity assignment area. The borehole layout can be referenced from the fifth assignment area 25.

[0053] In some possible implementations, such as Figure 4 , Figure 5 As shown, along the length of the working face, the spacing between any two sets of drilling units is 10m~20m.

[0054] like Figure 5 As shown, the fifth assignment region 25 is provided with eight sets of drilling units, which are symmetrically distributed on opposite sides of the fifth assignment region 25, with four sets of drilling units on each side. Along the length of the working face, the distance between any two sets of drilling units is S3, where S3 is 10m to 20m. By arranging the ninth borehole 251 and the tenth borehole 252 (or the eleventh borehole 253 and the twelfth borehole 254) in the fifth assignment region 25, the low porosity assignment region can be fully filled.

[0055] The eighth assignment area 35 (which includes the eighteenth borehole 351, the nineteenth borehole 352, the twentieth borehole 353, and the twenty-first borehole 354) is a low porosity assignment area. The borehole layout can be referenced from the fifth assignment area 25.

[0056] In some possible implementations, such as Figure 4 , Figure 5As shown, along the length of the working face, multiple sets of drilling units are provided on both sides of the working face. The multiple sets of drilling units are distributed on opposite sides of the working face, and each set of drilling units includes a drill hole. The drilling depth is: along the width direction of the working surface, the borehole opening is located at the edge of the working surface; The borehole opening height is: along the height direction of the working face, the borehole opening is located at the top of the working face.

[0057] like Figure 5 As shown, multiple sets of drilling units are arranged on both sides of the working face. These sets of drilling units are distributed on opposite sides of the working face. Each set of drilling units includes one borehole, namely, the first borehole 141, the fifth borehole 161, the seventh borehole 241, the thirteenth borehole 261, the fifteenth borehole 341, and the twenty-second borehole 361 in the figure; Figure 4 As shown, along the width of the working face, the borehole openings are located at the edges of the working face; along the height of the working face, the borehole openings are located at the top of the working face, and the boreholes slope upwards as a whole, starting from the adjacent underground roadway of the working face. By arranging these boreholes in this way along the two edges of the working face, sufficient filling of the two edges of the working face can be achieved.

[0058] In some possible implementations, such as Figure 4 , Figure 5 As shown, along the length of the working face, the spacing between any two sets of drilling units is 50m~80m.

[0059] like Figure 5 As shown, multiple sets of drilling units are arranged on both sides of the working face, distributed on opposite sides of the working face. The distance between any two sets of drilling units is S4, where S4 is 50m to 80m. By arranging these holes on both sides of the working face in this way, the two sides of the working face can be fully filled.

[0060] The above description, with reference to the accompanying drawings, illustrates a grouting zone layout method for a roof collapse goaf according to embodiments of the present disclosure, which has the following advantages: Grouting in old goaf areas where mining has ended and the roof has collapsed allows for independent coal mining and grouting processes. By rationally arranging the grouting holes, the amount and filling rate of grouting in the goaf can be effectively increased without affecting coal mining at the working face, thus achieving full filling of the remaining space in the goaf.

[0061] The basic principles of this disclosure have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this disclosure are merely examples and not limitations, and should not be considered as essential features of each embodiment of this disclosure. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the scope of this disclosure to the necessity of employing the aforementioned specific details for implementation.

[0062] The block diagrams of devices, apparatuses, devices, and systems disclosed herein are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0063] Additionally, as used herein, the "or" used in a list of items beginning with "at least one" indicates a separate list, such that a list of, for example, "at least one of A, B, or C" means A or B or C, or AB or AC or BC, or ABC (i.e., A and B and C). Furthermore, the word "exemplary" does not imply that the described example is preferred or better than other examples.

[0064] It should also be noted that in the system disclosed herein, the components or steps can be decomposed and / or recombined. These decompositions and / or recombinations should be considered as equivalent solutions to this disclosure.

[0065] Various changes, substitutions, and modifications can be made to the technology described herein without departing from the teachings defined by the appended claims. Furthermore, the scope of the claims of this disclosure is not limited to the specific aspects of the processes, machines, manufactures, events, means, methods, and actions described above. Currently existing or later-developed processes, machines, manufactures, events, means, methods, or actions that perform substantially the same function or achieve substantially the same result as the corresponding aspects described herein can be utilized. Therefore, the appended claims include such processes, machines, manufactures, events, means, methods, or actions within their scope.

[0066] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of this disclosure. Therefore, this disclosure is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features disclosed herein.

[0067] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this disclosure to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A method for grouting zone layout in goaf areas caused by roof collapse, characterized in that, include: The collapsed goaf of the working face is divided into multiple longitudinal regions along its length according to the porosity. The collapsed goaf of the working face is divided into multiple transverse regions along the width direction according to the porosity. Values ​​are assigned to the intersection areas of the vertical and horizontal regions respectively, thereby forming multiple assignment areas; Drill holes are arranged according to the type of the assigned area, and drilling is carried out from the adjacent underground roadway of the working face toward the assigned area along the width direction of the working face.

2. The grouting zone layout method for goaf areas caused by roof collapse according to claim 1, characterized in that, Based on the particle size of the grouting material and its fluidity and diffusivity in different porosity regions, different drilling layout principles are formulated for different types of assigned regions. The principle characteristics include the drilling depth, the borehole opening height, and the drilling spacing.

3. The grouting zone layout method for goaf areas caused by roof collapse according to claim 1, characterized in that, Based on three time periods of 6 months, 12 months, and more than 1 year of cessation of mining, the working face is divided into regions A, B, and C along its length, with corresponding porosities of high, medium, and low, respectively.

4. The grouting zone layout method for goaf areas caused by roof collapse according to claim 3, characterized in that, When the width L of the working face is greater than 1.2 times the coal seam burial depth H, the mining impact of the working face reaches a sufficient level. The central area where the width L exceeds 1.2 times the coal seam burial depth H is a fully compacted area after the roof collapses, and the two sides are not fully compacted areas. Accordingly, the working face is divided into M region and N region along the width direction, with corresponding high and low porosities, respectively. The N region is located between the two M regions.

5. The grouting zone layout method for goaf areas caused by roof collapse according to claim 4, characterized in that, The intersection area formed by region A and region M is a region with high porosity, and the intersection area formed by region A and region N is a region with medium porosity. The intersection area formed by region B and region M is a region with high porosity, and the intersection area formed by region B and region N is a region with low porosity. The intersection region formed by region C and region M is a region with medium porosity, and the intersection region formed by region C and region N is a region with low porosity.

6. The grouting zone layout method for goaf areas caused by roof collapse according to claim 5, characterized in that, Along the length of the working surface, multiple sets of drilling units are provided in the high porosity assignment area. The multiple sets of drilling units are distributed on the same side of the high porosity assignment area, and each set of drilling units includes one borehole. The depth of the borehole is such that, along the width direction of the working surface, the borehole opening is located in the middle of the high porosity assignment region; The borehole opening height is such that, along the height direction of the working surface, the borehole opening is located at the top of the high porosity assignment region.

7. The grouting zone layout method for goaf areas caused by roof collapse according to claim 6, characterized in that, Along the length of the working face, the spacing between any two sets of drilling units is 3 to 6 times the daily advance speed of the working face, but should be controlled within 50m to 60m.

8. The grouting zone layout method for goaf areas caused by roof collapse according to claim 5, characterized in that, Along the length of the working surface, multiple sets of drilling units are set in the porosity assignment region. The multiple sets of drilling units are distributed on the same side of the porosity assignment region, and each set of drilling units includes two drill holes. The depth of the borehole is: along the width direction of the working surface, the openings of the two boreholes are respectively located at 1 / 3 and 2 / 3 of the width of the porosity assignment area, or both are located in the middle of the porosity assignment area and distributed at different heights; The borehole opening height is: along the height direction of the working surface, the openings of the two boreholes are located in the upper part, or the upper and middle parts of the porosity assignment area.

9. The grouting zone layout method for goaf areas caused by roof collapse according to claim 8, characterized in that, Along the length of the working face, the spacing between any two sets of drilling units is 30m~40m.

10. The grouting zone layout method for goaf areas caused by roof collapse according to claim 5, characterized in that, Along the length of the working surface, multiple sets of drilling units are provided in the low porosity assignment area. The multiple sets of drilling units are distributed on opposite sides of the low porosity assignment area, and each set of drilling units includes two drill holes. The depth of the borehole is as follows: along the width direction of the working surface, the openings of the two boreholes are located at 1 / 3 and 2 / 3 of the width of the low porosity assignment area, respectively, and are distributed at different heights; The borehole opening height is such that, along the height direction of the working surface, the openings of the two boreholes are located at the upper and middle parts of the low porosity assignment region.

11. The grouting zone layout method for a roof collapse goaf area according to claim 10, characterized in that, Along the length of the working face, the spacing between any two sets of drilling units is 10m to 20m.

12. The grouting zone layout method for goaf areas caused by roof collapse according to claim 1, characterized in that, Along the length of the working surface, multiple sets of drilling units are provided on both sides of the working surface. The multiple sets of drilling units are distributed on opposite sides of the working surface, and each set of drilling units includes a drill hole. The depth of the borehole is such that the borehole opening is located at the edge of the working surface along the width direction of the working surface; The borehole opening height is such that, along the height direction of the working surface, the borehole opening is located at the top of the working surface.

13. The grouting zone layout method for goaf areas caused by roof collapse according to claim 12, characterized in that, Along the length of the working face, the spacing between any two sets of drilling units is 50m to 80m.

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