Method for treating room-and-pillar mining area

Abstract

The present application relates to the technical field of mine area treatment, in particular to a method for treating room-and-pillar type goaf, which comprises: arranging a water pumping drill site and a grouting drill site on the room-and-pillar type goaf, the grouting drill site and the water pumping drill site corresponding to the goaf space; respectively performing drilling at the water pumping drill site and the grouting drill site to obtain a water pumping hole and a grouting hole communicating with the goaf space; injecting hardenable slurry into the goaf space through the grouting hole, while pumping out underground water in the goaf space through the water pumping hole; after the slurry hardens, arranging a monitoring drill site on the room-and-pillar type goaf and performing drilling at the monitoring drill site to obtain a monitoring hole for observing the filling rate of the slurry, the monitoring hole communicating with the goaf space. The method for treating room-and-pillar type goaf can improve the stability of the room-and-pillar type goaf and avoid the collapse of the room-and-pillar type goaf.

Description

Technical Field

[0001] This invention relates to the field of mine management technology, specifically to a method for managing room-and-pillar goaf. Background Technology

[0002] A room-and-pillar goaf is the area left after the mineral seam has been mined using the room-and-pillar mining method. With the continuous development of national economic construction and mining cities, a large number of railways and highways need to pass through room-and-pillar goafs, and some buildings and structures also need to be built on them. Under the influence of overlying strata stress, weathering and other factors, the effective size of the pillars in room-and-pillar goafs is constantly decreasing, leading to a continuous decline in the stability of the goaf.

[0003] Among related technologies, how to manage goaf areas caused by room-and-pillar mining is an urgent technical problem to be solved. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose a method for managing room-and-pillar goaf areas. This method can improve the stability of room-and-pillar goaf areas, prevent collapse, and facilitate surface construction above the goaf areas.

[0005] The room-and-pillar goaf includes multiple retained pillars, which are arranged at intervals, and goaf spaces are formed between adjacent retained pillars. There are multiple goaf spaces, and adjacent goaf spaces are interconnected. The method for managing room-and-pillar goafs according to the present invention includes:

[0006] Pumping and grouting drilling positions are arranged on the goaf, and the grouting and pumping positions correspond to the goaf space.

[0007] Holes are drilled at the water pumping drill position and the grouting drill position respectively to obtain water pumping holes and grouting holes that communicate with the goaf space;

[0008] Hardenable grout is injected into the goaf through the grouting hole, and at the same time, groundwater in the goaf is pumped out through the pumping hole.

[0009] After the slurry hardens, monitoring drill positions are arranged on the room-and-pillar goaf, and holes are drilled at the monitoring drill positions to obtain monitoring holes for observing the slurry filling rate. The monitoring holes are connected to the goaf space.

[0010] The hardened grout was taken out through the monitoring hole, and the strength of the grout cementitious body was tested according to rock mechanics tests.

[0011] According to an embodiment of the present invention, a method for managing room-and-pillar goaf involves injecting hardenable grout into the goaf and simultaneously extracting groundwater from the goaf to improve its stability and prevent collapse, thus facilitating surface construction above the goaf. Furthermore, during groundwater extraction, the flow of groundwater guides the grout to diffuse around the injection holes, increasing its diffusion radius and thus increasing the grout's filling rate within the goaf, further enhancing its stability. Additionally, by observing the filling rate within the goaf through monitoring holes and by extracting the hardened grout through these holes, the stability of the goaf can be monitored, facilitating subsequent surface construction.

[0012] Optionally, a portion of the plurality of goaf spaces corresponds to the grouting hole, and another portion of the plurality of goaf spaces corresponds to the pumping hole.

[0013] Optionally, the periphery of each of the pumping holes is surrounded by at least two of the grouting holes.

[0014] Optionally, injecting hardenable grout into the goaf through the grouting hole includes:

[0015] The first grout, with a gradually decreasing water-to-solid ratio, is injected into the goaf through the grouting hole, and the water-to-solid ratio of the first grout is 1:0.8-1:1.2.

[0016] Then, a second grout is injected into the goaf through the grouting hole. The water-to-solid ratio of the second grout is 1:1.78.

[0017] Optionally, injecting hardenable grout into the goaf through the grouting hole includes:

[0018] The grouting pressure of the first grout is gradually increased, and the grouting pressure is 1MPa-2MPa.

[0019] Optionally, the solid materials of the first slurry are fly ash and cement, wherein the ratio of fly ash to cement is 4:1.

[0020] Optionally, the solid materials of the second slurry are fly ash, cement and sand, wherein the ratio of fly ash, cement and sand is 0.8:0.3:0.68.

[0021] Optionally, while drilling at the grouting drill position, a grouting pipe is laid in the grouting hole. The grouting pipe is connected to the goaf space, and hardenable grout is injected into the goaf space through the grouting pipe.

[0022] Optionally, the arrangement of monitoring drill positions on the room-and-pillar goaf includes:

[0023] A first monitoring drill position is arranged on the room-and-pillar goaf, the first monitoring drill position being adjacent to the grouting drill position; and / or

[0024] A second monitoring drill position is arranged on the room-and-pillar goaf, and the second monitoring drill position is located between two adjacent grouting drill positions.

[0025] Optionally, the scope of treatment for the room-and-pillar goaf is determined based on the structural characteristics of the room-and-pillar goaf and / or the geological characteristics of the room-and-pillar goaf and / or the characteristics of the quasi-building above the room-and-pillar goaf. Attached Figure Description

[0026] Figure 1 This is a flowchart illustrating the method for managing goaf areas in a room-pillar type according to an embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram illustrating the governance scope of an embodiment of the present invention.

[0028] Figure 3 This is a schematic diagram of the mined-out space according to an embodiment of the present invention.

[0029] Figure 4 This is a schematic diagram of the arrangement of the pumping drill position and the grouting drill position according to an embodiment of the present invention.

[0030] Figure 5 This is a schematic diagram of the borehole layout in a room-and-column type goaf according to an embodiment of the present invention.

[0031] Figure 6 This is a schematic diagram of the injection of the first slurry according to an embodiment of the present invention.

[0032] Figure 7 This is a schematic diagram of the injection of the second slurry according to an embodiment of the present invention.

[0033] Figure 8 This is a schematic diagram of the monitoring hole in an embodiment of the present invention.

[0034] Attached reference numerals: 1-Proposed building, 2-Bedrock, 3-Room-pillar goaf, 31-Retained pillar, 32-Goaf, 4-Pumping drill position, 5-Grouting drill position, 6-Pumping hole, 7-Grouting hole, 8-Grouting pipe, 9-Grouting fluid, 9a-First grout, 9b-Second grout, 10-Monitoring drill position, 10a-First monitoring drill position, 10b-Second monitoring drill position, 11-Monitoring hole, a-Pillar width, b-Goaf width. Detailed Implementation

[0035] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0036] The method for managing room-and-pillar goaf according to an embodiment of the present invention includes multiple retained pillars, which are arranged at intervals, and goaf spaces are formed between adjacent retained pillars. There are multiple goaf spaces, and adjacent goaf spaces are interconnected. The method for managing room-and-pillar goaf includes:

[0037] In the room-and-pillar goaf, water pumping and grouting drilling positions are arranged, with the grouting and water pumping positions corresponding to the goaf space.

[0038] Holes were drilled at the water pumping and grouting locations to obtain water pumping and grouting holes that connect with the mined-out space.

[0039] Hardenable grout is injected into the mined-out space through grouting holes, while groundwater in the mined-out space is extracted through pumping holes.

[0040] After the slurry hardens, monitoring drill positions are set up in the room-and-pillar goaf, and holes are drilled at the monitoring drill positions to obtain monitoring holes for observing the slurry filling rate. The monitoring holes are connected to the goaf space.

[0041] The hardened grout was extracted through the monitoring hole, and the strength of the grout binder was tested according to rock mechanics tests.

[0042] According to an embodiment of the present invention, a method for managing room-and-pillar goaf involves injecting hardenable grout into the goaf and simultaneously extracting groundwater from the goaf to improve its stability and prevent collapse, thus facilitating surface construction above the goaf. Furthermore, during groundwater extraction, the flow of groundwater guides the grout to diffuse around the injection holes, increasing its diffusion radius and thus increasing the grout's filling rate within the goaf, further enhancing its stability. Additionally, by observing the filling rate within the goaf through monitoring holes and by extracting the hardened grout through these holes, the stability of the goaf can be monitored, facilitating subsequent surface construction.

[0043] It should be noted that, in this invention, as Figure 2 , Figure 3 and Figure 5As shown, the room-and-pillar goaf 3 includes multiple retained pillars 31. These pillars 31 are used to support the ore body during mining and prevent it from collapsing. The multiple retained pillars 31 are arranged at intervals, and goaf spaces 32 are formed between adjacent pillars 31. There are multiple goaf spaces 32, and adjacent goaf spaces 32 are interconnected. The goaf spaces 32 can be understood as tunnels, etc., left after mining the ore body.

[0044] like Figure 1 As shown, the method for treating the goaf 3 of the room-pillar type according to the present invention includes steps S110-S150.

[0045] The method for managing room-and-pillar goaf 3 of the present invention is mainly for managing room-and-pillar goaf 3 using room-and-pillar mining method, ensuring the stability of room-and-pillar goaf 3, and avoiding collapse when buildings are constructed above room-and-pillar goaf 3.

[0046] Step S110: Arrange the pumping drill position 4 and the grouting drill position 5 on the room-column goaf 3, with the grouting drill position 5 and the pumping drill position 4 corresponding to the goaf space 32.

[0047] Specifically, such as Figure 5 As shown, on the surface, the arrangement of the pumping drill positions 4 and grouting drill positions 5 must correspond to the goaf 32, ensuring that the pumping holes 6 and grouting holes 7 obtained from the drilling at the pumping drill positions 4 and grouting drill positions 5 are connected to the goaf 32. This facilitates the extraction of groundwater from the goaf 32 through the pumping holes 6 and the injection of hardenable grout 9 into the goaf 32 through the grouting holes 7. Furthermore, it should be noted that the spacing between the grouting drill positions 5 is mainly determined based on the parameters of room-and-pillar mining. For example, the spacing between the grouting drill positions 5 is a multiple of the sum of the pillar width a and the goaf width b.

[0048] Step S120: Drill holes at the pumping drill position 4 and the grouting drill position 5 respectively to obtain the pumping hole 6 and the grouting hole 7 that are connected to the goaf space 32.

[0049] Specifically, such as Figure 6 As shown, groundwater can be extracted from the goaf 32 through the pumping hole 6, thereby reducing the pressure within the goaf 32 and increasing the diffusion radius of the grout 9 within it. This allows for the injection of more grout 9 into the goaf 32 and also increases the injection speed, thus improving the efficiency of the grout injection process. In other words, the lower the pressure within the goaf 32, the easier it is to inject the grout 9. Simultaneously, in a lower-pressure goaf 32, the flow resistance of the grout 9 is lower, which is more conducive to its diffusion and thus increases the grout filling rate within the goaf 32.

[0050] In addition, the groundwater extracted from the mined-out space 32 can be used as a raw material for slurry 9, saving treatment costs.

[0051] Step S130: Inject hardenable grout 9 into the goaf 32 through the grouting hole 7, and at the same time, pump out the groundwater in the goaf 32 through the pumping hole 6.

[0052] Specifically, such as Figure 6 , Figure 7 and Figure 8 As shown, while injecting hardenable grout 9 into the goaf 32, the groundwater in the goaf 32 is extracted, so that the flow of groundwater in the goaf 32 can guide the flow of grout 9 in the goaf 32. That is, the groundwater plays a certain guiding role for grout 9, thereby increasing the diffusion radius of grout 9 and further increasing the filling rate of grout 9 in the goaf 32.

[0053] Step S140: After the slurry 9 hardens, a monitoring drill position 10 is arranged on the room-and-pillar goaf 3, and a hole is drilled at the monitoring drill position 10 to obtain a monitoring hole 11 for observing the slurry filling rate. The monitoring hole 11 is connected to the goaf space 32.

[0054] Specifically, such as Figure 8 As shown, the slurry filling rate of the goaf 32 can be monitored through the detection hole 11, thereby determining whether the stability of the room-and-pillar goaf 3 meets the requirements for constructing a building. Furthermore, the detection hole 11 can monitor the goaf 32 and the bedrock 2 above it for an extended period, serving as an early warning system.

[0055] Step S150: Take out the hardened grout 9 through monitoring hole 11, and test the grout cement strength of grout 9 according to rock mechanics test.

[0056] The process of rock mechanics testing: Hardened grout 9 is obtained by drilling through test hole 11, and the hardened grout 9 is sent to the laboratory and subjected to a uniaxial compressive strength test using an experimental device to measure the strength of the hardened grout 9.

[0057] In some embodiments, a portion of the plurality of goaf spaces 32 corresponds to the grouting hole 7, and another portion of the plurality of goaf spaces 32 corresponds to the pumping hole 6.

[0058] Specifically, such as Figure 5 As shown, a goaf 32 is not simultaneously connected to the grouting hole 7 and the pumping hole 6, thereby ensuring the spacing between the grouting hole 7 and the pumping hole 6, preventing the arrangement of too many grouting holes 7 and pumping holes 6, and avoiding increasing the cost of treatment.

[0059] In some embodiments, each pumping hole 6 is surrounded by at least two grouting holes 7.

[0060] Specifically, such as Figure 4 As shown, the diffusion range of the grout 9 injected through the grouting hole 7 is fixed. Each pumping hole 6 is surrounded by at least two grouting holes 7, which can ensure that the grout 9 between the grouting holes 7 can be connected to each other.

[0061] In addition, to ensure the grout filling rate within the goaf 32, grout 9 can be injected into the goaf 32 through the pumping hole 6. Furthermore, the pumping hole 6 can also serve as a backup inspection hole 11 to monitor the goaf 32 and the bedrock 2 above it, providing an early warning function. Simultaneously, the hardened grout 9 can be extracted through the pumping hole 6 to test the grout cementing strength of the grout 9.

[0062] In some embodiments, injecting hardenable grout 9 into the goaf 32 through the grouting hole 7 includes:

[0063] Step S131: Inject the first grout 9a with a gradually decreasing water-to-solid ratio into the goaf space 32 through the grouting hole 7, and the water-to-solid ratio of the first grout 9a is 1:0.8-1:1.2.

[0064] Specifically, such as Figure 6 As shown, initially, a first slurry 9a with a low water-to-solid ratio is injected into the goaf 32. Since the first slurry 9a with a high water-to-solid ratio has lower viscosity, its outward diffusion radius can be increased, thus improving the slurry filling rate of the goaf 32. That is, when the distance between two adjacent grouting holes 7 is fixed, more first slurry 9a with a high water-to-solid ratio is located at the midpoint of these two grouting holes 7, which can be understood as a higher slurry filling rate for the goaf 32. Furthermore, as the first slurry 9a with a gradually decreasing water-to-solid ratio is continuously injected into the goaf 32, its viscosity continuously increases, and its hardened strength also continuously increases. In other words, after the area around the grouting holes 7 is filled with slurry, the hardened strength of the first slurry 9a around the grouting holes 7 is ensured to be high, improving the local stability around the grouting holes 7.

[0065] Step S132: Then inject the second grout 9b into the goaf space 32 through the grouting hole 7. The water-solid ratio of the second grout 9b is 1:1.78.

[0066] Specifically, such as Figure 8 As shown, the water-to-solid ratio of the second grout 9b is much greater than that of the first grout 9a. That is, the structural strength of the solid after the second grout 9b hardens is much greater than that of the solid after the first grout 9a hardens, which further improves the local stability around the grouting hole 7.

[0067] In addition, after the first grout 9a is injected, the second grout 9b (water: fly ash: cement: sand = 1:0.8:0.3:0.68) is injected into the goaf 32 to perform roof grouting. The cement content accounts for 15%-25% of the solid materials, which ensures the fluidity and strength of the grout 9, and this ratio is economical and saves on treatment costs.

[0068] In some embodiments, injecting hardenable grout 9 into the goaf 32 through the grouting hole 7 includes:

[0069] Step S132: The grouting pressure of the first grout 9a is gradually increased to 1MPa-2MPa.

[0070] Specifically, the grouting pressure of the first grout 9a is gradually increased, which can increase the diffusion radius of the first grout 9a in the goaf 32 and further improve the grout filling rate of the goaf 32.

[0071] In some embodiments, the solid materials of the first slurry 9a are fly ash and cement, with a fly ash to cement ratio of 4:1.

[0072] In some embodiments, the solid materials of the second slurry 9b are fly ash, cement and sand, and the ratio of fly ash, cement and sand is 0.8:0.3:0.68.

[0073] In some embodiments, while drilling at the grouting drill position 5, a grouting pipe 8 is laid in the grouting hole 7. The grouting pipe 8 is connected to the goaf space 32, and hardenable grout 9 is injected into the goaf space 31 through the grouting pipe 8.

[0074] Specifically, such as Figure 6 , Figure 7 and Figure 8 As shown, the installation of grouting pipes 8 within the grouting hole 7 facilitates the injection of grout 9 into the goaf 31, preventing grout 9 from adhering to the grouting hole 7 and thus preventing grout 9 from clogging the grouting hole 7. Simultaneously, the grouting pipes 8 provide some support within the grouting hole 7, preventing its collapse.

[0075] In some embodiments, arranging monitoring drill positions 10 on the room-and-pillar goaf 3 includes:

[0076] The first monitoring drill position 10a is arranged on the room-and-pillar goaf 3, and the first monitoring drill position 10a is adjacent to the grouting drill position 5.

[0077] Specifically, such as Figure 8As shown, the first monitoring drill position 10a is adjacent to the grouting drill position 5. A test hole 11 can be obtained by drilling through the first monitoring drill position 10a. The test hole 11 can be used to monitor the situation around the grouting hole 7, such as the bonding effect of the grout 9 around the grouting hole 7 and the strength of the grout cementitious body.

[0078] A second monitoring drill position 10b is arranged on the room-and-pillar goaf 3, and the second monitoring drill position 10b is located between two adjacent grouting drill positions 5.

[0079] Specifically, such as Figure 8 As shown, the second monitoring drill position 10b is located between two adjacent grouting drill positions 5, and can monitor the grouting filling rate of the room-and-pillar goaf 3. For example, the closer the position is to the grouting drill position 5, the higher the grouting filling rate of the grout 9. The grouting filling rate is monitored at the midpoint between the two grouting drill positions 5. If the grouting filling rate meets the requirements, the grouting filling rate at other positions between the two grouting drill positions 5 also meets the requirements.

[0080] In some embodiments, the treatment scope of the room-and-pillar goaf 3 is determined based on the structural characteristics of the room-and-pillar goaf 3 and / or the geological characteristics 3 located in the room-and-pillar goaf and / or the characteristics of the quasi-building located above the room-and-pillar goaf 3.

[0081] Specifically, the structural features of the room-and-pillar goaf 3 are the cross-sectional dimensions of the pillars, the height dimensions of the pillars, and the layout of the pillars.

[0082] In addition, the geological characteristics of the room-and-pillar goaf 3 are: ore layer burial depth, ore layer dip angle, ore layer spacing, ore layer thickness, stratum lithology, stratum structure and rock movement pattern.

[0083] In addition, the characteristics of a proposed building include its structure and its layout.

[0084] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0085] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0086] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0087] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0088] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0089] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A method for managing goaf areas caused by room-pillar mining, characterized in that, The room-and-pillar goaf includes multiple retained pillars, which are arranged at intervals, and goaf spaces are formed between adjacent retained pillars. There are multiple goaf spaces, and adjacent goaf spaces are interconnected. The method for managing the room-and-pillar goaf includes: Pumping and grouting drilling positions are arranged on the goaf, and the grouting and pumping positions correspond to the goaf space. Holes are drilled at the water pumping drill position and the grouting drill position respectively to obtain water pumping holes and grouting holes that communicate with the goaf space; Hardenable grout is injected into the goaf through the grouting hole, and groundwater in the goaf is extracted through the pumping hole. The groundwater extracted from the goaf is used as the raw material for the grout. The injection of hardenable grout into the goaf through the grouting hole includes: The first grout, with a gradually decreasing water-to-solid ratio, is injected into the goaf through the grouting hole, and the water-to-solid ratio of the first grout is 1:0.8-1:1.

2. Then, a second grout is injected into the goaf through the grouting hole. The water-to-solid ratio of the second grout is 1:1.

78. After the slurry hardens, monitoring drill positions are arranged on the room-and-pillar goaf, and holes are drilled at the monitoring drill positions to obtain monitoring holes for observing the slurry filling rate. The monitoring holes are connected to the goaf space. The hardened grout was taken out through the monitoring hole, and the strength of the grout cementitious body was tested according to rock mechanics tests. A portion of the plurality of mined-out spaces corresponds to the grouting holes, and another portion of the plurality of mined-out spaces corresponds to the pumping holes; Each of the pumping holes is surrounded by at least two of the grouting holes. The injection of hardenable grout into the goaf through the grouting hole includes: The grouting pressure of the first grout is gradually increased, and the grouting pressure is 1MPa-2MPa.

2. The method for treating room-and-pillar goaf according to claim 1, characterized in that, The solid materials of the first slurry are fly ash and cement, and the ratio of fly ash to cement is 4:

1.

3. The method for treating room-and-pillar goaf according to claim 1, characterized in that, The solid materials of the second slurry are fly ash, cement and sand, and the ratio of fly ash, cement and sand is 0.8:0.3:0.

68.

4. The method for treating room-and-pillar goaf according to any one of claims 1-3, characterized in that, While drilling at the grouting drill position, a grouting pipe is laid in the grouting hole. The grouting pipe is connected to the goaf space, and hardenable grout is injected into the goaf space through the grouting pipe.

5. The method for treating room-and-pillar goaf according to any one of claims 1-3, characterized in that, The arrangement of monitoring drill positions on the room-and-pillar goaf includes: A first monitoring drill position is arranged on the room-and-pillar goaf, the first monitoring drill position being adjacent to the grouting drill position; and / or A second monitoring drill position is arranged on the room-and-pillar goaf, and the second monitoring drill position is located between two adjacent grouting drill positions.

6. The method for treating room-and-pillar goaf according to any one of claims 1-3, characterized in that, The scope of treatment for the room-and-pillar goaf is determined based on the structural characteristics of the goaf and / or the geological characteristics of the goaf and / or the characteristics of the proposed buildings above the goaf.

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