Room-pillar type goaf cemented filling treatment method

Abstract

The invention discloses a room-pillar type goaf cemented filling treatment method. The method comprises the steps that S1, a goaf is divided into a plurality of filling areas, and the positions of edge coal pillars and middle coal pillars of each filling area are determined; s2, punching edge holes between two adjacent edge coal pillars; s3, filling pipes are laid in the edge holes, filling bags are arranged on the filling pipes, and the filling bags are lowered into the filling area; s4, the filling bags are filled with slurry through the filling pipes, the bottoms of the filling bags abut against the bottom plate of the filling area, and the side portions of the filling bags abut against the two adjacent edge coal pillars; s5, waiting for solidification of the slurry; and S6, a middle hole is drilled between every two adjacent middle coal pillars, and the sealed space of the filling area is filled with slurry. According to the method, the stability of the coal pillar is improved, the roof disaster risk caused by instability of the coal pillar is reduced, the influence of coal mining on the environment can be reduced, green low-carbon mining is achieved, and the method is suitable for the room-pillar goaf in which sealing measures are taken, simpler and more convenient to operate and easy to implement.

Description

Technical Field

[0001] The invention relates to the technical field of filling mining, and in particular to a room-and-pillar goaf cementing filling treatment method. Background Art

[0002] With the continuous exploitation of coal resources in my country, many mining areas often have simple coal mining methods due to the low level of production technology and equipment and backward production processes. In this case, many mining areas generally adopt room-and-pillar mining methods, resulting in the formation of a large number of room-and-pillar goafs with poor distribution regularity. A large number of coal pillars are left in these goafs. Under the long-term influence of various coupling effects such as overburden stress and water erosion, these coal pillars gradually lose stability and their bearing capacity decreases accordingly. When a coal pillar loses stability, it will trigger the successive instability of adjacent coal pillars, similar to the "domino effect", which may eventually lead to disasters in the roof of the goaf, posing a serious threat to mine safety and the environment.

[0003] In order to achieve green and low-carbon mining, backfill mining technology has become an important technical means. Among them, cementitious backfilling technology is widely used in the field of coal mining because of its unique advantages such as controlling surface subsidence, realizing "three under" (underwater, under buildings, under railways) mining, and increasing the upper limit of coal mining. Using cementitious backfilling to reinforce room-and-pillar goafs and coal pillars is an effective method. However, since room-and-pillar goafs usually have closed measures, the area is large and personnel or equipment are prohibited from entering, the traditional cementitious backfilling method is difficult to apply to the management of such goafs. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention proposes a room-and-pillar goaf cementing and filling treatment method.

[0006] The room-and-pillar goaf cementing filling treatment method of the embodiment of the present invention comprises:

[0007] S1. Divide the goaf into multiple filling areas, and determine the positions of the edge coal pillars and the middle coal pillars of each filling area;

[0008] S2, drilling an edge hole between two adjacent edge coal pillars;

[0009] S3, laying a filling tube in the edge hole, placing a filling bag on the filling tube and lowering the filling bag into the filling area;

[0010] S4, using the filling pipe to fill the filling bag with slurry, so that the bottom of the filling bag stops against the bottom plate of the filling area, and the side of the filling bag stops against two adjacent edge coal pillars;

[0011] S5, waiting for the slurry to solidify so that the edge coal pillar and the filling bag enclose the filling area to form a sealed space;

[0012] S6. Drill an intermediate hole between two adjacent intermediate coal pillars, and use the intermediate hole to fill the sealed space of the filling area with slurry.

[0013] In some embodiments, a plurality of slide grooves are provided on the inner wall of the filling tube, and the plurality of slide grooves are arranged at intervals along the circumference of the filling tube. The slide grooves extend along the axial direction of the filling tube. A slide buckle is provided on the filling bag, and the slide buckle can be slidably matched with the slide groove along the axial direction of the filling tube. A stop portion is provided in the slide groove, and the stop portion is used to stop the slide buckle upward.

[0014] In some embodiments, the slide groove is a T-shaped groove, and the slide buckle is a T-shaped buckle.

[0015] In some embodiments, the room-and-pillar goaf cementing filling treatment method of an embodiment of the present invention also includes a first pressure sensor and a controller. The first pressure sensor is arranged on the outer bottom wall of the filling bag and is connected to the controller signal. In S4, when the first pressure sensor contacts the bottom plate of the filling area, the first pressure sensor sends a signal to the controller to confirm that the filling bag has reached the bottom of the filling area.

[0016] In some embodiments, an ultrasonic liquid level sensor is provided on the top of the filling bag, and the ultrasonic liquid level sensor is connected to the controller. In S4, the ultrasonic liquid level sensor is used to detect the liquid level height of the slurry in the filling bag in real time to determine whether the filling bag has slurry leakage.

[0017] In some embodiments, a second pressure sensor is provided on the top of the filling bag, and the second pressure sensor is connected to the controller. In S4, the second pressure sensor is used to detect the pressure in the filling bag to determine whether the filling bag is full.

[0018] In some embodiments, in S4, when grouting occurs in the filling pipe or the filling pressure increases sharply, the bonding grouting filling is completed.

[0019] In some embodiments, in S5, the time for waiting for the slurry to solidify is greater than or equal to seven days.

[0020] In some embodiments, the edge holes and the middle holes are arranged in a vertical direction, and the number of the middle holes is multiple.

[0021] In some embodiments, the filling bag is a high-strength and wear-resistant nylon bag.

[0022] The room-and-pillar goaf cementing and filling treatment method of the embodiment of the present invention improves the stability of the coal pillar and reduces the risk of roof disasters caused by coal pillar instability through cementing and filling technology. Cementing and filling can control surface subsidence and avoid damage to ground buildings and facilities. The use of cementing and filling technology can reduce the impact of coal mining on the environment and achieve green and low-carbon mining. This method is suitable for room-and-pillar goafs where closure measures have been taken, and can be applied to a variety of geological conditions and mining environments. Compared with traditional methods, this invention is simpler to operate and easier to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic flow chart of a room-and-pillar goaf cementing and filling treatment method according to an embodiment of the present invention.

[0024] Figure 2 Schematic diagram of punching holes in the filling area of ​​an embodiment of the present invention.

[0025] Figure 3 Schematic diagram of the arrangement of the filling bag according to the embodiment of the present invention.

[0026] Figure 4 Schematic diagram of the filling slurry in the filling area of ​​the embodiment of the present invention.

[0027] Figure 5 Schematic diagram of the connection between the filling bag and the filling tube according to an embodiment of the present invention.

[0028] Figure 6 4 is a cross-sectional view of a filling bag and a filling tube according to an embodiment of the present invention.

[0029] Figure 7 Schematic diagram of the structure of a filling bag according to an embodiment of the present invention.

[0030] Figure 8 Schematic diagram of the structure of the filling tube according to the embodiment of the present invention.

[0031] Reference numerals:

[0032] 100, goaf; 200, slurry; 1, filling area; 2, edge coal pillar; 3, middle coal pillar; 4, edge hole; 5, filling pipe; 501, slide; 502, stopper; 6, filling bag; 601, slider; 7, middle hole; 8, first pressure sensor; 9, ultrasonic liquid level sensor; 10, second pressure sensor. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0034] like Figures 1 to 8 As shown, the room-and-pillar goaf cementing filling treatment method of the embodiment of the present invention comprises:

[0035] Step S1, dividing the goaf 100 into a plurality of filling areas 1, and determining the positions of the edge coal pillars 2 and the middle coal pillars 3 of each filling area 1. This step provides clear areas and objects for subsequent operations, which helps to carry out targeted governance.

[0036] Step S2: drilling edge holes 4 between two adjacent edge coal pillars 2. This provides a channel for the subsequent arrangement of filling tubes 5 and filling bags 6.

[0037] Step S3, laying a filling pipe 5 in the edge hole 4, setting a filling bag 6 on the filling pipe 5 and lowering the filling bag 6 into the filling area 1. This step is a key step in the treatment process, which transports the slurry 200 to the designated location and uses the filling bag 6 to form a support.

[0038] Step S4, use the filling tube 5 to fill the filling bag 6 with filling slurry 200, so that the bottom of the filling bag 6 stops on the bottom plate of the filling area 1, and the side of the filling bag 6 stops on the two adjacent edge coal pillars 2; this step helps to improve the stability of the coal pillar and prevent the chain reaction caused by the instability of the coal pillar.

[0039] Step S5, waiting for the slurry 200 to solidify, so that the edge coal pillars 2 and the filling bags 6 enclose the filling area 1 to form a sealed space. This step ensures the stability of the filling area 1 and provides conditions for subsequent filling.

[0040] Step S6, drilling a middle hole 7 between two adjacent middle coal pillars 3, and using the middle hole 7 to fill the sealed space of the filling area 1 with slurry 200 to ensure the stability and sealing of the entire filling area 1.

[0041] The room-and-pillar goaf cementing and filling treatment method of the embodiment of the present invention improves the stability of the coal pillar and reduces the risk of roof disasters caused by coal pillar instability through cementing and filling technology. Cementing and filling can control surface subsidence and avoid damage to ground buildings and facilities. The use of cementing and filling technology can reduce the impact of coal mining on the environment and achieve green and low-carbon mining. This method is suitable for room-and-pillar goafs where closure measures have been taken, and can be applied to a variety of geological conditions and mining environments. Compared with traditional methods, this invention is simpler to operate and easier to implement.

[0042] In some embodiments, Figure 6 and Figure 8As shown, a plurality of slide grooves 501 are provided on the inner wall of the filling tube 5, and the plurality of slide grooves 501 are arranged at intervals along the circumference of the filling tube 5, and the slide grooves 501 extend along the axial direction of the filling tube 5. A slide buckle 601 is provided on the filling bag 6, and the slide buckle 601 can slidably cooperate with the slide groove 501 along the axial direction of the filling tube 5, and a stopper 502 is provided in the slide groove 501, and the stopper 502 is used to stop the slide buckle 601 upward.

[0043] A plurality of slide grooves 501 are provided on the inner wall of the filling tube 5. These slide grooves 501 are arranged at intervals along the circumference of the filling tube 5 and extend along the axial direction of the filling tube 5, so that the slide grooves 501 can provide uniform support points in the circumferential direction and provide sufficient length in the axial direction so that the slider 601 can slide and fix smoothly.

[0044] The filling bag 6 is provided with a slider 601 which can slide along the axial direction of the filling tube 5 and cooperate with the slide groove 501 so that the slider 601 can move along the filling tube 5 as needed during the filling process, thereby achieving accurate positioning and fixation of the filling bag 6.

[0045] The coordinated use of the chute 501 and the slider 601 can ensure the accurate positioning of the filling bag 6 in the filling tube 5, avoid the position deviation of the filling bag 6 during the filling process, and thus improve the treatment effect. The stopper 502 in the chute 501 is used to stop the slider 601 upward, so that during the filling process of the slurry 200, the slider 601 will not slide due to the pressure of the slurry 200, thereby ensuring the stability and fixation effect of the filling bag 6. The coordinated use of the slider 601 and the chute 501 simplifies the filling operation process and improves the convenience and efficiency of the operation. The operator only needs to slide the slider 601 along the chute 501 to the appropriate position and then fix it. The design of the slider 601 and the chute 501 enhances the stability of the filling system and reduces the unexpected situations that may occur during the filling process, such as the slipping or rupture of the filling bag 6, thereby improving the safety of the entire treatment process. This arrangement can also adjust the length and number of the chute 501 and the slider 601 according to the specific conditions of different goaf areas 100 to adapt to filling areas of different sizes and shapes.

[0046] Optionally, the slide groove 501 is a T-shaped groove, and the slide buckle 601 is a T-shaped buckle.

[0047] In some embodiments, the room-and-pillar goaf cementing filling treatment method of the embodiment of the present invention further includes a first pressure sensor 8 and a controller, wherein the first pressure sensor 8 is disposed on the outer bottom wall of the filling bag 6 and is connected to the controller signal. In S4, when the first pressure sensor 8 contacts the bottom plate of the filling area 1, the first pressure sensor 8 sends a signal to the controller to confirm that the filling bag 6 reaches the bottom of the filling area 1.

[0048] The first pressure sensor 8 is placed on the outer bottom wall of the filling bag 6. This position enables the sensor to directly detect the pressure change when the filling bag 6 contacts the bottom plate of the filling area 1. The first pressure sensor 8 is connected to the controller via a signal line, and the pressure information can be transmitted in real time. In step S4, when the bottom of the filling bag 6 contacts the bottom plate of the filling area 1, the pressure detected by the first pressure sensor 8 will change and send a signal to the controller. After receiving the signal, the controller will process it and trigger a corresponding response to ensure that the filling bag 6 is correctly placed at the bottom of the filling area 1.

[0049] The room-and-pillar goaf cementing filling treatment method of the embodiment of the present invention confirms whether the filling bag 6 has reached the bottom of the filling area 1 through a pressure sensor, which can ensure that the filling bag 6 starts filling at the correct position, avoiding the problem of insufficient filling or excessive filling. Accurate position confirmation reduces the risk of structural instability caused by uneven filling or incorrect position of the filling bag 6, thereby improving the safety of the treatment process. The use of a controller allows the entire filling process to be automatically adjusted, reducing the need for manual intervention and improving filling efficiency and treatment speed.

[0050] In some embodiments, an ultrasonic level sensor 9 is provided on the top of the filling bag 6, and the ultrasonic level sensor 9 is connected to the controller. In S4, the ultrasonic level sensor 9 is used to detect the liquid level of the slurry 200 in the filling bag 6 in real time to determine whether the filling bag 6 has slurry leakage.

[0051] The ultrasonic liquid level sensor 9 can monitor the liquid level of the slurry 200 in real time, ensure that the filling process proceeds according to the predetermined plan, and promptly discover and deal with potential problems. By detecting the liquid level height in real time, the slurry leakage situation can be judged in time, so as to take measures to stop filling or adjust the filling parameters to avoid the waste of slurry 200 and poor filling effect. By accurately controlling the filling amount of slurry 200, it can be ensured that the slurry 200 in the filling bag 6 is evenly distributed and the filling quality is improved. Timely discovery and treatment of slurry leakage can avoid potential safety hazards caused by leakage of slurry 200 and improve the safety of the treatment process.

[0052] In some embodiments, a second pressure sensor 10 is provided on the top of the filling bag 6, and the second pressure sensor 10 is connected to the controller. In S4, the second pressure sensor 10 is used to detect the pressure in the filling bag 6 to determine whether the filling bag 6 is full.

[0053] The second pressure sensor 10 can accurately detect the pressure of the slurry 200 inside the filling bag 6, ensuring that the filling process is carried out according to the predetermined pressure parameters, thereby improving the filling accuracy. By real-time monitoring of the pressure, it is possible to avoid overfilling of the filling bag 6 and prevent damage or structural deformation of the filling bag 6 due to excessive pressure. The second pressure sensor 10 helps to ensure that the slurry 200 in the filling bag 6 is evenly distributed, avoiding structural stability problems caused by uneven slurry 200. By real-time monitoring of the filling pressure, timely measures can be taken when the pressure is abnormal to avoid production safety accidents caused by pressure out of control.

[0054] In some embodiments, in S4, when grouting occurs in the filling pipe 5 or the filling pressure increases sharply, the bonding grouting filling is completed.

[0055] During the filling process, the system will monitor whether there is any grouting in the filling tube 5 and whether the filling pressure increases sharply. Once grouting or a sharp increase in pressure is detected, the system will automatically stop the current cementing grouting filling and close the filling tube 5. After stopping the filling, the system will wait for the cementing material to solidify to form a stable filling body. During this period, the controller will automatically determine whether the filling bag 6 needs to be supplemented or released based on the signals detected by the first pressure sensor 8 (located at the bottom of the filling bag 6) and the second pressure sensor 10 (located at the top of the filling bag 6). According to the judgment result of the controller, the system will perform corresponding grouting or release on the filling bag 6 to adjust the filling state.

[0056] Through real-time monitoring and automatic adjustment, the slurry 200 in the filling bag 6 can be ensured to be evenly distributed, avoiding structural stability problems caused by uneven filling. Slurry return and a sharp increase in pressure may be signs of problems such as damage to the filling bag 6 or overfilling. Stopping filling and dealing with these problems in time can avoid the occurrence of safety accidents. Through slurry replenishment or slurry release, the amount of slurry 200 used can be accurately controlled to reduce waste and save costs. The automatic judgment and adjustment function of the controller reduces manual intervention and improves the automation and work efficiency of the filling process.

[0057] In some embodiments, in S5 , the time for waiting for the slurry 200 to solidify is greater than or equal to seven days.

[0058] Cementitious filling materials (such as cement, lime, etc.) will gradually harden during the solidification process, and seven days is generally considered to be the time it takes for the material to reach initial strength. During this time, the hydration reaction of the material will gradually complete, ensuring the physical and chemical properties of the material. A solidification time of more than seven days can ensure that the filling body reaches sufficient strength, thereby improving the stability of the structure.

[0059] In some embodiments, the edge holes 4 and the middle holes 7 are arranged in the vertical direction, and the number of the middle holes 7 is plural.

[0060] The edge holes 4 and the middle holes 7 are arranged in the vertical direction, so that the filling material can be more evenly distributed in the goaf 100, thereby improving the filling efficiency. The number of the middle holes 7 is multiple, so that the closed space of the filling area 1 can be quickly and evenly filled, further facilitating the improvement of the filling efficiency.

[0061] Optionally, the filling bag 6 is a high-strength and wear-resistant nylon bag.

[0062] The high-strength nylon cloth can withstand the pressure during the filling process and is not easily damaged, thereby ensuring the structural integrity of the filling bag 6. The environment in the goaf 100 is complex, and there may be sharp objects or friction. The wear-resistant nylon cloth can resist wear and extend the service life of the filling bag 6. The nylon cloth has good elasticity and flexibility, and can adapt to the irregularity of the shape of the goaf 100, ensuring that the filling material can be evenly distributed.

[0063] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0064] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0065] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0067] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0068] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A room-and-pillar goaf cementing and filling treatment method, characterized in that: include: S1. Divide the goaf into multiple filling areas, and determine the positions of the edge coal pillars and the middle coal pillars of each filling area; S2, drilling an edge hole between two adjacent edge coal pillars; S3, laying a filling tube in the edge hole, placing a filling bag on the filling tube and lowering the filling bag into the filling area; S4, using the filling pipe to fill the filling bag with slurry, so that the bottom of the filling bag stops against the bottom plate of the filling area, and the side of the filling bag stops against two adjacent edge coal pillars; S5, waiting for the slurry to solidify so that the edge coal pillar and the filling bag enclose the filling area to form a sealed space; S6. Drill an intermediate hole between two adjacent intermediate coal pillars, and use the intermediate hole to fill the sealed space of the filling area with slurry.

2. The room-and-pillar goaf cementing and filling treatment method according to claim 1 is characterized in that: A plurality of slide grooves are provided on the inner wall of the filling tube, and the plurality of slide grooves are arranged at intervals along the circumference of the filling tube. The slide grooves extend along the axial direction of the filling tube. A slide buckle is provided on the filling bag, and the slide buckle can slidably cooperate with the slide groove along the axial direction of the filling tube. A stop portion is provided in the slide groove, and the stop portion is used to stop the slide buckle upward.

3. The room-and-pillar goaf cementing and filling treatment method according to claim 2 is characterized in that: The slide groove is a T-shaped groove, and the slide buckle is a T-shaped buckle.

4. The room-and-pillar goaf cementing and filling treatment method according to claim 1 is characterized in that: It also includes a first pressure sensor and a controller. The first pressure sensor is arranged on the outer bottom wall of the filling bag and is connected to the controller signal. In S4, when the first pressure sensor contacts the bottom plate of the filling area, the first pressure sensor sends a signal to the controller to confirm that the filling bag reaches the bottom of the filling area.

5. The room-and-pillar goaf cementing and filling treatment method according to claim 4 is characterized in that: An ultrasonic liquid level sensor is provided on the top of the filling bag, and the ultrasonic liquid level sensor is connected to the controller. In S4, the ultrasonic liquid level sensor is used to detect the liquid level height of the slurry in the filling bag in real time to determine whether the filling bag has slurry leakage.

6. The room-and-pillar goaf cementing and filling treatment method according to claim 4 is characterized in that: A second pressure sensor is provided on the top of the filling bag, and the second pressure sensor is connected to the controller. In S4, the second pressure sensor is used to detect the pressure in the filling bag to determine whether the filling bag is full.

7. The room-and-pillar goaf cementing and filling treatment method according to claim 6 is characterized in that: In S4, when grouting occurs in the filling pipe or the filling pressure increases sharply, the bonding grouting filling is completed.

8. The room-and-pillar goaf cementing and filling treatment method according to claim 1 is characterized in that: In S5, the time for waiting for the slurry to solidify is greater than or equal to seven days.

9. The room-and-pillar goaf cementing filling treatment method according to claim 1, characterized in that: The edge holes and the middle holes are arranged along the vertical direction, and the number of the middle holes is multiple.

10. The room-and-pillar goaf cementing filling treatment method according to claim 1, characterized in that: The filling bag is a high-strength wear-resistant nylon bag.

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