A method for treating a room-and-pillar mining area by cement filling

Abstract

The application discloses a kind of room pillar type goaf cemented filling treatment methods, comprising: S1, the goaf is divided into multiple filling areas, and the position of each filling area edge coal pillar and intermediate coal pillar is determined;S2, between two adjacent edge coal pillars, edge hole is punched;S3, laying filling pipe in edge hole, setting filling bag on filling pipe and lowering filling bag into filling area;S4, filling pipe is used to fill slurry into filling bag, so that the bottom of filling bag is stopped on the floor of filling area, and the side of filling bag is stopped on two adjacent edge coal pillars;S5, wait for slurry to solidify;S6, between two adjacent intermediate coal pillars, intermediate hole is punched, and filling area is filled with slurry in sealed space.The application improves the stability of coal pillar, reduces the risk of roof disaster caused by the instability of coal pillar, can reduce the impact of coal mining on the environment, realize green and low-carbon mining, and is suitable for room and pillar type goaf that has taken closure measures, is more simple and convenient to operate, and is 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 my country's coal resources, many mining areas often employ simple coal mining methods due to low-level production technology and equipment and outdated production processes. Consequently, many mining areas commonly adopt room-and-pillar mining, resulting in a large number of irregularly distributed room-and-pillar goafs. These goafs are left with numerous coal pillars. Under the long-term influence of multiple coupling factors, such as overburden stress and water erosion, these pillars gradually lose their stability, and their bearing capacity also decreases. When a coal pillar loses stability, it triggers the subsequent destabilization of adjacent coal pillars, similar to a "domino effect," ultimately leading to roof failure in 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, cemented backfill technology is widely used in the field of coal mining due to its unique advantages such as controlling surface subsidence, realizing "three under" (underwater, under buildings, and under railways) mining, and increasing the upper limit of coal mining. Using cemented backfill to reinforce room-and-pillar goafs and coal pillars is an effective method. However, since room-and-pillar goafs are usually closed, the area is large and personnel or equipment are prohibited from entering, traditional cemented backfill methods are 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 provides a room-and-pillar goaf cementing and filling treatment method.

[0006] The room-and-pillar goaf cementing and filling treatment method according to an embodiment of the present invention includes:

[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 the 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, punching an intermediate hole between two adjacent intermediate coal pillars, and filling the slurry into the sealed space of the filling area through the intermediate hole.

[0013] In some embodiments, a plurality of chutes are arranged on the inner wall of the filling pipe, the chutes are arranged along the circumference of the filling pipe, the chutes extend along the axial direction of the filling pipe, the filling bag is provided with a sliding buckle, the sliding buckle is slidably matched with the chutes along the axial direction of the filling pipe, and the chutes are provided with a stop portion for upwardly stopping the sliding buckle.

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

[0015] In some embodiments, the room and pillar mining area cemented filling treatment method further comprises a first pressure sensor and a controller, the first pressure sensor is arranged on the outer bottom wall of the filling bag and is signal-connected with the controller, and when the first pressure sensor contacts the floor of the filling area in S4, the first pressure sensor sends a signal to the controller to confirm that the filling bag reaches the bottom of the filling area.

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

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

[0018] In some embodiments, in S4, when the filling pipe returns to the slurry or the filling pressure rises sharply, the cemented grouting filling is completed.

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

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

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

[0022] The house pillar type goaf cemented filling treatment method of the embodiment of the present application improves the stability of the coal pillar through the cemented filling technology, and reduces the roof disaster risk caused by the instability of the coal pillar. The cemented filling can control the surface subsidence and avoid damage to the ground buildings and facilities. The cemented filling technology can reduce the influence of coal mining on the environment and realize green and low-carbon mining. The method is suitable for the house pillar type goaf that has taken closure measures, and can be applied to various geological conditions and mining environments. Compared with the traditional method, the operation of the present application is more simple and easy to implement. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a flowchart of the house pillar type goaf cemented filling treatment method of the embodiment of the present application.

[0024] Figure 2 is a perforating diagram of the filling area of the embodiment of the present application.

[0025] Figure 3 is a layout diagram of the filling bag of the embodiment of the present application.

[0026] Figure 4 is a diagram of the filling slurry of the filling area of the embodiment of the present application.

[0027] Figure 5 is a connection diagram of the filling bag and the filling pipe of the embodiment of the present application.

[0028] Figure 6 is a sectional view of the filling bag and the filling pipe of the embodiment of the present application.

[0029] Figure 7 is a structure diagram of the filling bag of the embodiment of the present application.

[0030] Figure 8 is a structure diagram of the filling pipe of the embodiment of the present application.

[0031] Reference signs:

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

[0033] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0034] AsFigures 1 to 8 As shown, the cemented filling treatment method for the room-and-pillar goaf in the embodiment of the present application comprises:

[0035] Step S1, divide the goaf 100 into multiple filling areas 1, and determine the positions of the edge coal pillars 2 and the middle coal pillars 3 in each filling area 1. This step provides clear areas and objects for subsequent operations, which helps to carry out targeted treatment.

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

[0037] Step S3, lay the filling pipes 5 in the edge holes 4, set the filling bags 6 on the filling pipes 5, and lower the filling bags 6 into the filling areas 1. This step is a key step in the treatment process, which delivers the slurry 200 to the designated position and forms support using the filling bags 6.

[0038] Step S4, fill the slurry 200 into the filling bags 6 using the filling pipes 5, so that the bottom of the filling bag 6 abuts against the floor of the filling area 1, and the side of the filling bag 6 abuts against the two adjacent edge coal pillars 2. This step helps to improve the stability of the coal pillars and prevent the chain reaction caused by the instability of the coal pillars.

[0039] Step S5, wait 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, drill middle holes 7 between two adjacent middle coal pillars 3, fill the slurry 200 into the sealed space of the filling area 1 using the middle holes 7, and ensure the stability and sealing of the entire filling area 1.

[0041] The cemented filling treatment method for the room-and-pillar goaf in the embodiment of the present application improves the stability of the coal pillars by using the cemented filling technology, and reduces the risk of roof disaster caused by the instability of the coal pillars. Cemented filling can control surface subsidence and avoid damage to ground buildings and facilities. The use of cemented filling technology can reduce the environmental impact of coal mining and achieve green and low-carbon mining. This method is suitable for room-and-pillar goafs that have taken closure measures, and can be applied to various geological conditions and mining environments. Compared with traditional methods, the present invention is more convenient and easy to implement.

[0042] In some embodiments, as Figure 6 and Figure 8As shown, the inner wall of the filling pipe 5 is provided with a plurality of sliding grooves 501, which are arranged along the circumferential direction of the filling pipe 5 and extend along the axial direction of the filling pipe 5. The filling bag 6 is provided with a sliding buckle 601, which is slidably matched with the sliding groove 501 along the axial direction of the filling pipe 5. The sliding groove 501 is provided with a stop portion 502 for upwardly stopping the sliding buckle 601.

[0043] The inner wall of the filling pipe 5 is provided with a plurality of sliding grooves 501, which are arranged along the circumferential direction of the filling pipe 5 and extend along the axial direction of the filling pipe 5, so that the sliding grooves 501 can provide uniform support points in the circumferential direction and sufficient length in the axial direction to facilitate the smooth sliding and fixation of the sliding buckle 601.

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

[0045] The cooperation of the sliding groove 501 and the sliding buckle 601 can ensure the accurate positioning of the filling bag 6 in the filling pipe 5 and avoid the position deviation of the filling bag 6 during the filling process, thereby improving the treatment effect. The stop portion 502 in the sliding groove 501 is used to upwardly stop the sliding buckle 601, so that the sliding buckle 601 will not slide due to the pressure of the slurry 200 during the filling of the slurry 200, thereby ensuring the stability and fixation effect of the filling bag 6. The cooperation of the sliding buckle 601 and the sliding groove 501 simplifies the filling operation process and improves the convenience and efficiency of the operation. The operator only needs to slide the sliding buckle 601 along the sliding groove 501 to the appropriate position and then fix it. The design of the sliding buckle 601 and the sliding groove 501 enhances the stability of the filling system and reduces the accidental situations that may occur during the filling process, such as the sliding or rupture of the filling bag 6, thereby improving the safety of the entire treatment process. This setting can also adjust the length and number of the sliding groove 501 and the sliding buckle 601 according to the specific conditions of different goaf 100 to adapt to different sizes and shapes of the filling area.

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

[0047] In some embodiments, the room-and-pillar goaf cemented filling treatment method of the present embodiment further comprises a first pressure sensor 8 and a controller. The first pressure sensor 8 is arranged on the outer bottom wall of the filling bag 6 and is signal-connected with the controller. In S4, when the first pressure sensor 8 contacts the floor 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 pressure changes when the filling bag 6 contacts the bottom plate of the filling area 1. The first pressure sensor 8 is connected to the controller through a signal line, enabling real-time transmission of pressure information. 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 changes and sends a signal to the controller. After receiving the signal, the controller processes it and triggers the corresponding response to ensure that the filling bag 6 is correctly placed at the bottom of the filling area 1.

[0049] The house pillar type goaf cemented filling treatment method of the embodiments of the present application confirms whether the filling bag 6 reaches the bottom of the filling area 1 through the pressure sensor, ensuring that the filling bag 6 starts filling at the correct position and avoiding underfilling or overfilling problems. 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 the controller enables automatic adjustment of the entire filling process, reducing the need for manual intervention and improving filling efficiency and treatment speed.

[0050] In some embodiments, the top of the filling bag 6 is provided with an ultrasonic liquid level sensor 9 connected to the controller. In S4, the ultrasonic liquid 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 is running slurry.

[0051] The ultrasonic liquid level sensor 9 can monitor the liquid level of the slurry 200 in real time, ensuring that the filling process proceeds according to the predetermined plan and promptly discovers and handles potential problems. By detecting the liquid level in real time, it can be determined whether the slurry is running, so that measures can be taken to stop filling or adjust the filling parameters to avoid waste of slurry 200 and poor filling results. By accurately controlling the amount of slurry 200, it can be ensured that the slurry 200 in the filling bag 6 is evenly distributed, improving the filling quality. Timely detection and handling of slurry running can avoid potential safety hazards caused by slurry leakage, improving the safety of the treatment process.

[0052] In some embodiments, the top of the filling bag 6 is provided with a second pressure sensor 10 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 accuracy of the filling. By monitoring the pressure in real time, it can be avoided that the filling bag 6 is overfilled, and the filling bag 6 is damaged or deformed 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. Real-time monitoring of the filling pressure can take timely measures when the pressure is abnormal, avoiding safety accidents caused by out-of-control pressure.

[0054] In some embodiments, in S4, when the backflow of slurry or the sharp rise of filling pressure occurs in the filling pipe 5, the current cementation grouting filling is completed.

[0055] During the filling process, the system monitors whether the backflow of slurry occurs in the filling pipe 5 and whether the filling pressure rises sharply. Once the backflow of slurry or the sharp rise of pressure is detected, the system automatically stops the current cementation grouting filling and closes the filling pipe 5. After stopping the filling, the system waits for the cementation material to solidify to form a stable filling body. During this period, the controller automatically determines whether the filling bag 6 needs to be supplemented or discharged according to 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 performs corresponding supplement or discharge treatment on the filling bag 6 to adjust the filling state.

[0056] Through real-time monitoring and automatic adjustment, it can be ensured that the slurry 200 in the filling bag 6 is evenly distributed, avoiding structural stability problems caused by uneven filling. Backflow and sharp rise of pressure may be signs of filling bag 6 damage or overfilling. Timely stopping of filling and handling of these problems can avoid safety accidents. Through the supplement or discharge treatment, the use amount of slurry 200 can be accurately controlled, waste is reduced, and cost is saved. The automatic judgment and adjustment function of the controller reduces manual intervention, improves the automation degree and working efficiency of the filling process.

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

[0058] The cementation filling material (such as cement, lime, etc.) will gradually harden during the solidification process, and seven days is generally considered to be the time for the material to reach the initial strength. During this time, the hydration reaction of the material is gradually completed, ensuring the physical and chemical properties of the material. The 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 hole 4 and the middle hole 7 are arranged in a vertical direction, and the number of the middle hole 7 is multiple.

[0060] The edge hole 4 and the middle hole 7 are arranged in the vertical direction, which can make the filling material more evenly distributed in the goaf 100, and improve the filling efficiency. The number of the middle hole 7 is multiple, which can quickly and evenly fill the closed space of the filling area 1, and further improve the filling efficiency.

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

[0062] The high-strength nylon cloth can withstand the pressure in the filling process and is not easy to break, which ensures 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 tear, prolonging the service life of the filling bag 6. The nylon cloth has good stretchability and flexibility, which can adapt to the irregularity of the shape of the goaf 100, and ensure that the filling material can be evenly distributed.

[0063] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0064] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0065] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0066] In the present application, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Also, a first feature "over", "above" and "on top of" a second feature can be directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. A first feature "under", "below" and "underneath" a second feature can be directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0067] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material or characteristic is included in at least one embodiment or example of the present application. Exemplary representations of the above terms in the present specification are not necessarily directed to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any suitable manner in one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0068] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary, and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

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 the two adjacent edge coal pillars; S5, waiting for the slurry to solidify so that the edge coal pillars and the filling bags enclose the filling area to form a sealed space; S6. Drilling a middle hole between two adjacent middle coal pillars, and using the middle hole to fill the sealed space of the filling area with slurry; The inner wall of the filling tube is provided with a plurality of slide grooves, which are arranged at intervals along the circumference of the filling tube. The slide grooves extend along the axial direction of the filling tube. The filling bag is provided with a slider, which is slidably engaged with the slide groove along the axial direction of the filling tube. A stopper is provided in the slide groove, which is used to stop the slider upward. comprising a first pressure sensor and a controller, wherein the first pressure sensor is disposed on the outer bottom wall of the filling bag and is signal-connected to the controller. In step 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; 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 lost slurry.

2. The room-and-pillar goaf cementing and filling treatment method according to claim 1 is characterized in that: The sliding groove is a T-shaped groove, and the sliding buckle is a T-shaped buckle.

3. The room-and-pillar goaf cementing and filling treatment method according to claim 1 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.

4. The room-and-pillar goaf cementing and filling treatment method according to claim 3 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.

5. 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.

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

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

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