A method and system for constructing in-situ large-diameter piers for filling and treating coal mining subsidence areas

Abstract

The present invention relates to a pier construction method and system, belonging to the field of geological management, and specifically to an in-situ large-diameter pier construction method and system for filling and managing coal mining subsidence areas. The present invention can effectively solve the problems that when the current slurry full filling method is used, the slurry flow direction is unclear, the shape of the filling body in the goaf is difficult to predict, the effective connection range between the slurry stone body and the goaf roof is not ideal, the filling volume has a large deviation from the design, the engineering material waste is serious, and the engineering cost is high. While solving the above problems, it also expands the method of filling and managing the goaf.

Description

Technical Field

[0001] The invention relates to a pier column construction method and system, and belongs to the field of geological management, and specifically relates to an in-situ large-diameter pier column construction method and system for filling and managing coal mining subsidence areas. Background Art

[0002] For deeply buried deposits, underground mining is generally used. However, the cavities formed by large-scale underground mining often induce man-made geological disasters such as ground subsidence in mining areas and mine earthquakes. At present, most of the domestic management of such geological disasters adopts the method of filling all the underground voids in the goaf with cement fly ash and other slurries. The collapse zone and water-conducting fracture zone formed by mining are filled with cement fly ash slurry with a water-cement ratio of 0.7 to 1.2:1.0. The slurry is bonded with the gravel, coal blocks and other materials in the collapse zone to form a goaf filling body to support the stability of the overlying strata. When the slurry full filling method is used, there are problems such as unclear slurry flow direction, difficult to control the shape of the goaf filling body, unsatisfactory effective connection range between the slurry stone body and the goaf roof, and the filling volume is far greater than the designed engineering volume, which not only wastes engineering materials, but also increases engineering costs and prolongs the construction period. Summary of the invention

[0003] A brief summary of one or more aspects is given below to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceived aspects, and is neither intended to identify the key or critical elements of all aspects nor to define the scope of any or all aspects. Its only purpose is to give some concepts of one or more aspects in a simplified form as a prelude to a more detailed description that will be given later.

[0004] The main purpose of the present invention is to solve the technical problems existing in the prior art, and to provide an in-situ large-diameter pier construction method and system for filling and treating coal mining subsidence areas. The system and method can effectively solve the problems of unclear slurry flow direction, difficult to predict the filling body shape of the goaf, unsatisfactory effective contact range between the slurry stone body and the goaf roof, large deviation between the filling volume and the design, serious waste of engineering materials, and high engineering costs when the current slurry full filling method is used.

[0005] The present invention adopts intelligent drilling rigs and three-dimensional laser scanning equipment to explore basic information such as the approximate scope of the goaf, whether there is water accumulation in the goaf, and whether there is collapsed and broken rock in the goaf; after the goaf exploration is completed, the goaf exploration information is promptly fed back to the ground intelligent control console through optical fiber; the intelligent control console issues instructions to the mixing control system based on the goaf exploration feedback information, and then prepares slurries with different properties suitable for the actual situation of the goaf, and sprays them into piers in the goaf.

[0006] To solve the above problems, the solution of the present invention is:

[0007] An in-situ large-diameter pier construction method for filling and treating coal mining subsidence areas, comprising:

[0008] An information exploration and feedback step is used to obtain basic information of the goaf and feed it back to the control console, wherein the basic information includes the range of the goaf and the type of the goaf range;

[0009] In the filling slurry configuration step, the control console issues instructions to the mixing control system according to the feedback information from the exploration of the goaf, and then configures slurries with different properties suitable for the actual conditions of the goaf. When the exploration result within the target filling position range is collapsed rock fragments, the control console issues a slurry configuration instruction to the slurry automatic configuration system; when the exploration result within the target filling position range is a hollow area, the control console issues a silk slurry configuration instruction to the slurry automatic configuration system;

[0010] The pier jetting forming step is to jet the configured slurry into the goaf to form the pier.

[0011] Preferably, in the above-mentioned in-situ large-diameter pier construction method for filling and treating coal mining subsidence areas, in the information exploration and feedback step, the goaf is longitudinally scanned, and the scanning results are recorded at predetermined intervals, and the scanning order is sequentially scanned from the bottom plate to the top plate of the goaf (from bottom to top);

[0012] On the same horizontal layer scanning trajectory, with the plane coordinate system as the reference and the laser scanning center point as the coordinate origin, the distance from the point on the scanning trajectory to the scanning center point is recorded once every predetermined azimuth angle and the average range of the plane closed loop trajectory obtained by the horizontal layer scanning is calculated;

[0013] The plane closed loop trajectory of each horizontal scanning layer is determined based on the average range of the plane closed loop trajectory.

[0014] Preferably, in the above-mentioned in-situ large-diameter pier construction method for filling and controlling coal mining subsidence areas, in the filling slurry configuration step, if the scanning results of each horizontal scanning layer in the longitudinal scanning process show only one plane closed loop trajectory line, then the goaf is directly judged to be a hollow type and filled with 1# slurry.

[0015] Preferably, in the above-mentioned in-situ large-diameter pier construction method for filling and treating coal mining subsidence areas, in the filling slurry configuration step, if the longitudinal scanning result shows that a certain horizontal layer has more than one plane closed loop trajectory line, and the next adjacent horizontal layer has only one plane closed trajectory, 1# slurry is also directly used for filling;

[0016] Preferably, in the above-mentioned in-situ large-diameter pier construction method for filling and treating coal mining subsidence areas, in the filling slurry configuration step, if the longitudinal scanning result shows that a certain horizontal layer has more than one plane closed loop trajectory line, and the next adjacent horizontal layer also has more than one plane closed loop trajectory line, the filling slurry is selected according to the following different situations:

[0017] The horizontal layer scanning result is hour

[0018]

[0019] The horizontal layer scanning result is hour

[0020]

[0021] The horizontal layer scanning result is hour

[0022]

[0023] Among them, the average range of the innermost closed loop trajectory is recorded as It is used to represent the average coverage of the collapsed rock debris; the average coverage of the outermost closed loop trajectory is recorded as Used to indicate the average range of the periphery of the void area;

[0024] Among them, the consistencies of the three slurries 1#, 2# and 3# decrease in sequence.

[0025] Preferably, in the above-mentioned in-situ large-diameter pier construction method for filling and treating coal mining subsidence areas, the 1# filling slurry, in terms of ingredients, includes, by weight: 0.70 to 1.20 parts of ordinary Portland cement P·O 42.5; 0.80 to 1.10 parts of Class F, grade II fly ash; 2.83 to 4.42 parts of medium sand; 0.65 to 1.43 parts of water; 0.09 to 0.12 parts of UEA expansion agent; 0.11 to 0.13 parts of slag powder; 0.0014 to 0.0015 parts of polyvinyl alcohol fiber; and 0.026 to 0.035 parts of accelerator.

[0026] Preferably, in the above-mentioned in-situ large-diameter pier construction method for filling and treating coal mining subsidence areas, the 2# filling slurry, in terms of ingredients, includes, by weight: 0.90-1.20 parts of ordinary Portland cement P·O 42.5; 0.60-1.00 parts of Class F, Grade II fly ash; 1.68-2.96 parts of medium sand; 0.96-2.06 parts of water; 0.10-0.13 parts of UEA expansion agent; 0.13-0.15 parts of slag powder; 0.0013-0.0014 parts of polyvinyl alcohol fiber; and 0.020-0.032 parts of accelerator.

[0027] Preferably, in the above-mentioned in-situ large-diameter pier construction method for filling and treating coal mining subsidence areas, the 3# filling slurry, in terms of ingredients, includes, by weight: 0.90 to 1.30 parts of ordinary Portland cement P·O 42.5; 0.35 to 0.80 parts of Class F, grade II fly ash; 0.86 to 2.34 parts of medium sand; 1.20 to 2.65 parts of water; 0.12 to 0.15 parts of UEA expansion agent; 0.13 to 0.15 parts of slag powder; 0.0013 to 0.0014 parts of polyvinyl alcohol fiber; and 0.014 to 0.030 parts of accelerator.

[0028] An in-situ large-diameter pier construction system for filling and treating coal mining subsidence areas, comprising: a slurry stirring device (3), a drilling vehicle (4), and a control console (5);

[0029] The drilling vehicle (4) is provided with a slurry jetting booster (3-1), and the slurry jetting booster (3-1) is connected to the slurry stirring device (3) and the machine tool drill rod (4-2) through a slurry jetting input pipeline (3-2) and a slurry jetting output pipeline (3-3) respectively;

[0030] The tool drill rod (4-2) is provided with a monitoring sensor probe (5-2), and the monitoring sensor probe (5-2) is connected to the control console (5) via a monitoring optical fiber (5-1);

[0031] The slurry injection booster (3-1) injects slurry into the goaf through the slurry injection output pipeline (3-3) under the control of the control console (5).

[0032] Preferably, in the above-mentioned in-situ large-diameter pier construction system for filling and treating coal mining subsidence areas, the drilling vehicle is a crawler type, and the drilling vehicle is mainly composed of a chassis, a bracket, a machine drill rod, a transfer device, and a hydraulic system.

[0033] Preferably, in the above-mentioned in-situ large-diameter pier construction system for filling and treatment of coal mining subsidence areas, the control console is configured to: issue instructions to the mixing control system based on the feedback information from the exploration of the goaf, and then prepare slurries with different properties suitable for the actual conditions of the goaf, wherein when the exploration result within the target filling position range is collapsed rock fragments, the control console issues a slurry preparation instruction to the slurry automatic configuration system; when the exploration result within the target filling position range is a hollow area, the control console issues a silk slurry preparation instruction to the slurry automatic configuration system.

[0034] Therefore, compared with the prior art, the advantages of the present invention are:

[0035] It can accurately detect the basic information of the goaf; the filling slurry has good fluidity, viscosity, cohesion and mechanical properties. The use of this slurry can reasonably control the shape of the filling body in the goaf, increase the effective connection range between the slurry stone body and the goaf roof, and strongly guarantee the support of the filling piers to the goaf roof; the filling slurry is low in cost and makes full use of the collapsed rock in the goaf as part of the raw materials of the piers, which greatly saves engineering costs and improves the efficiency of hidden danger control in the goaf. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments of the present invention and, together with the description, further serve to explain the principles of the invention and to enable one skilled in the art to make and use the present disclosure.

[0037] Figure 1 The technical roadmap of three-dimensional laser scanning research on hidden danger control areas in the embodiment of the present invention is illustrated;

[0038] Figure 2 The flowchart of identifying the hidden danger control area in the embodiment of the present invention is illustrated;

[0039] Figure 3 A schematic diagram of an in-situ large-diameter pier construction method in an embodiment of the present invention is illustrated;

[0040] Figure 4 The schematic diagram of the preparation and delivery of the spray slurry in the embodiment of the present invention is illustrated;

[0041] Figure 5 A schematic diagram of a ground high-pressure jet injection device in an embodiment of the present invention is illustrated;

[0042] Figure 6 A schematic diagram of a control console of a ground high-pressure jet injection device in an embodiment of the present invention is illustrated;

[0043] Figure 7 The schematic diagram of the in-situ large-diameter pier structure in the goaf in the embodiment of the present invention is illustrated;

[0044] In the figure, 1. ground, 1-1. soil layer, 1-2. rock layer, 1-3. coal seam roof, 1-4. coal seam, 1-5. coal seam floor, 2. goaf, 3. slurry stirring device, 3-1. jet slurry booster, 3-2. jet slurry input pipeline, 3-3. jet slurry output pipeline, 4. drilling vehicle, 4-1. bracket 4-2. machine drill rod, 5. control console, 5-1. monitoring optical fiber, 5-2. monitoring sensor probe, 6. pier.

[0045] Embodiments of the present invention will be described with reference to the accompanying drawings. DETAILED DESCRIPTION

[0046] This embodiment provides a method for constructing in-situ large-diameter piers suitable for filling and treatment of mining subsidence areas, including: basic situation exploration of goaf areas, goaf area information feedback, automatic configuration of filling slurry, and high-pressure injection of slurry into piers.

[0047] In this embodiment, the following can be used Figure 1 The 3D laser scanning technology shown is used to study hidden danger control areas.

[0048] The information to be explored in the goaf includes: the approximate range of the goaf, whether there is water accumulation in the goaf, whether there is collapsed rock in the goaf, etc. On the jet drilling rig, a stress sensor, an electromagnetic sensor, and a micro 3D laser scanner are installed 10 to 20 cm away from the end of the drill bit. When the jet drilling rig drills into the stratum and the goaf, the stress sensor, electromagnetic sensor, and micro 3D laser scanner are used to explore the actual situation of the goaf;

[0049] In this embodiment, as a preferred implementation, the goaf information feedback includes: timely feeding back goaf exploration information to the ground intelligent control console via optical fiber. After the goaf exploration is completed, the goaf exploration information is timely fed back to the ground intelligent control console, and the exploration equipment is connected to the ground intelligent control console via optical fiber.

[0050] In the present embodiment, as a preferred implementation mode, the automatic configuration of the filling slurry includes: the intelligent control console issues instructions to the stirring control system according to the feedback information of the goaf exploration, and then prepares slurries with different properties suitable for the actual conditions of the goaf; the basic logic of the intelligent stirring control system and the preparation of the slurry is: when the exploration result within the target filling position range is collapsed rock fragments, the control console issues a slurry preparation instruction to the automatic slurry configuration system; when the exploration result within the target filling position range is a hollow area, the control console issues a silk slurry preparation instruction to the automatic slurry configuration system.

[0051] In this embodiment, you can choose Figure 2 The hidden danger treatment area identification process shown in the figure is used to prepare slurries with different properties suitable for the actual situation of the goaf. This process can be used to identify the conditions of cavities or collapsed rock fragments in the hidden danger treatment area, and select corresponding filling slurries for different geological conditions.

[0052] Combine the following Figure 2 , please provide specific instructions.

[0053] like Figure 2 As shown, the interval between adjacent horizontal scanning layers is h d The scanning order is from the bottom to the top of the goaf (from bottom to top), and every h d The height scan is recorded once;

[0054] On the scanning trajectory line of the same horizontal layer (denoted as j), the plane coordinate system is used as the reference, the center point of the laser scanning is used as the coordinate origin, and every The azimuth angle records the distance from a point on the scanning trajectory to the scanning center point. Then a horizontal scan records a total of n j Data (including is a divisor of 360, With n j The product of is 360), for this n j Take the average of the data:

[0055]

[0056] Then the average range of the plane closed loop trajectory obtained by scanning the horizontal layer (j layer) is:

[0057]

[0058] From the bottom plate to the top plate of the goaf (j = 0 ~ h):

[0059] If the scanning results of each horizontal scanning layer All show only one plane closed loop trajectory line, indicating that there is no collapsed rock debris in the goaf, and the detection area is a cavity, which is filled with 1# slurry (thick slurry): (recorded as working condition I)

[0060] If the scanning results show that a certain horizontal layer has more than one plane closed loop trajectory, continue to scan the next adjacent horizontal layer, and then select the filling slurry according to the scanning results of this horizontal layer and the adjacent horizontal layer. The average range of the innermost closed loop trajectory is recorded as It is used to represent the average coverage of the collapsed rock debris; the average range of the outermost closed loop trajectory is recorded as Used to indicate the average range of the outer perimeter of the void area; the design radius of the pier is denoted as L d .

[0061] When the scanning results show that a certain horizontal layer has more than one plane closed loop trajectory, and the next adjacent horizontal layer has only one plane closed trajectory, 1# slurry is used for filling (recorded as working condition II);

[0062] When the scanning results show that a certain horizontal layer has more than one plane closed loop trajectory line, and the next adjacent horizontal layer also has more than one plane closed loop trajectory line, the filling slurry is selected according to the following different situations:

[0063] The horizontal layer scanning result is hour,

[0064]

[0065] The horizontal layer scanning result is hour,

[0066]

[0067] The horizontal layer scanning result is hour,

[0068]

[0069] In this embodiment, three types of high-performance filling slurries, namely 1#, 2# and 3#, are provided. This type of filling slurry has good fluidity, viscosity, cohesion and mechanical properties, and is low in cost. It can be used to construct in-situ large-diameter piers for filling and treatment of mining subsidence areas.

[0070] The composition and content of the 1# filling slurry are as follows: 0.70-1.20 parts of ordinary Portland cement P·O 42.5; 0.80-1.10 parts of Class F II fly ash; 2.83-4.42 parts of medium sand; 0.65-1.43 parts of water; 0.09-0.12 parts of UEA expansion agent; 0.11-0.13 parts of slag powder; 0.0014-0.0015 parts of polyvinyl alcohol fiber; and 0.026-0.035 parts of accelerator.

[0071] Among them, the 2# filling slurry, the ingredients are calculated by weight, and the composition and content are as follows: ordinary Portland cement P·O 42.5 0.90-1.20 parts; Class F II fly ash 0.60-1.00 parts; medium sand 1.68-2.96 parts; water 0.96-2.06 parts; UEA expansion agent 0.10-0.13 parts; slag powder 0.13-0.15 parts; polyvinyl alcohol fiber 0.0013-0.0014 parts; accelerator 0.020-0.032 parts.

[0072] Among them, the 3# filling slurry, the ingredients are calculated by weight, and the composition and content are as follows: ordinary Portland cement P·O 42.5 0.90-1.30 parts; Class F II fly ash 0.35-0.80 parts; medium sand 0.86-2.34 parts; water 1.20-2.65 parts; UEA expansion agent 0.12-0.15 parts; slag powder 0.13-0.15 parts; polyvinyl alcohol fiber 0.0013-0.0014 parts; accelerator 0.014-0.030 parts.

[0073] The consistencies of the 1#, 2# and 3# slurries decrease in sequence, wherein the 1# slurry has the largest concentration, the injection pressure at the slurry nozzle outlet is relatively small, the nozzle horizontally rotates at a relatively slow speed, and the filling slurry can condense into a circular pile body by itself; the 3# slurry has the smallest concentration, the injection pressure at the slurry nozzle outlet is relatively large, the nozzle horizontally rotates at a relatively fast speed, and the high-pressure injection slurry is mixed and stirred with the surrounding debris and condensed into a circular pier column; the 2# slurry has a concentration between the 1# slurry and the 3# slurry, and the slurry is also mixed and stirred with the surrounding debris under the action of the injection pressure and condensed into a circular pier column.

[0074] Among them, the high-pressure spraying of slurry into piers includes: when the slurry is prepared as a thin slurry, the concentration of the prepared slurry is relatively small, and the spraying pressure at the outlet of the slurry nozzle is relatively large, the horizontal rotation speed of the nozzle is relatively fast, and the high-pressure sprayed slurry is mixed and stirred with the surrounding debris and condensed into a circular pier; when the slurry is prepared as silk slurry, the concentration of the slurry is relatively large, the spraying pressure at the outlet of the slurry nozzle is relatively small, the horizontal rotation speed of the nozzle is relatively slow, and the filling slurry itself condenses into a circular pile body.

[0075] In this embodiment, the intelligent control console issues instructions to the stirring control system based on the feedback information from the goaf exploration, and prepares slurries with different properties suitable for the actual conditions of the goaf: when the exploration results within the target filling position or the hidden danger control area are displayed as "Operating Condition I", "Operating Condition II", "Operating Condition III", or "Operating Condition V", the control console issues a "prepare 1# slurry" instruction to the slurry automatic configuration system; when the exploration results within the target filling position or the hidden danger control area are displayed as "Operating Condition IV" or "Operating Condition VI", the control console issues a "prepare 2# slurry" instruction to the slurry automatic configuration system; when the exploration results within the target filling position or the hidden danger control area are displayed as "Operating Condition VII", the control console issues a "prepare 3# slurry" instruction to the slurry automatic configuration system.

[0076] When the instruction is "prepare 1# slurry", the slurry concentration is relatively high, the injection pressure at the slurry nozzle outlet is relatively low, the horizontal rotation speed of the nozzle is relatively slow, and the filling slurry itself condenses into a circular pile body; when the instruction is "prepare 3# slurry", the slurry concentration is relatively low, and the injection pressure at the slurry nozzle outlet is relatively high, the horizontal rotation speed of the nozzle is relatively fast, and the high-pressure injection slurry is mixed and stirred with the surrounding debris and condensed into a circular pier column; when the instruction is "prepare 2# slurry", the prepared slurry concentration is lower than that of 1# slurry and higher than that of 3# slurry, and the injection pressure at the slurry nozzle outlet is higher than that of 1# slurry and lower than that of 3# slurry, the horizontal rotation speed of the nozzle is higher than that of 1# slurry and lower than that of 3# slurry, and the 2# high-pressure injection slurry is also mixed and stirred with the surrounding debris and condensed into a circular pier column.

[0077] The goaf filling slurry is Bingham fluid, and the slurry is cemented and hardened over time.

[0078] The slurry conforms to the Bingham model. In this embodiment, the average flow rate of the slurry in the pipeline is calculated using the following formula:

[0079]

[0080] Where: v is the average flow velocity of the slurry in the pipeline, m / s;

[0081] R inner radius of the slurry pipe, cm;

[0082] η is plastic viscosity, Pa·s;

[0083] Starting pressure gradient of slurry in pipeline, MPa / m

[0084] τ0 is the shear yield stress of slurry, Pa;

[0085] When the slurry is configured as 1# slurry, the thick slurry conveying and injection parameters are: R = 14cm, η = 4.5Pa·s, τ0=25Pa

[0086] Then there is

[0087] After the 1# slurry is ejected horizontally from the pipeline, it performs a quasi-horizontal throwing motion in the goaf. The vertical height h of the nozzle from the ejection position is maintained at 0.3m. Then the horizontal ejection distance of the thick slurry in the goaf is;

[0088]

[0089] L r Horizontal injection distance of thick slurry in goaf, m;

[0090] t is the time from the slurry being sprayed to the ground, s;

[0091] g is the gravitational acceleration of the slurry, m / s2

[0092] Depend on Available Then we can get:

[0093]

[0094] The 1# slurry is sprayed in the goaf to form a pier with a radius of 2.6m and a diameter of 5.2m.

[0095] When the slurry is configured as 2# slurry, the slurry conveying and injection parameters are: R = 14cm, η = 0.3Pa·s, τ0=8Pa

[0096]

[0097] After the 2# slurry is ejected horizontally from the pipeline, the speed is as high as 121.3m / s; the high-speed jet slurry quickly stirs the in-situ collapsed rock fragments and solidifies them into one, and the mixed solidified body is in the form of a round column; depending on the different rock fragments, the column diameter can reach 3m to 4m.

[0098] When the slurry is configured as 3# slurry, the slurry conveying and injection parameters are: R = 14cm, η = 0.1Pa·s, τ0=3Pa

[0099]

[0100] After the 3# slurry is ejected horizontally from the pipeline, the speed is as high as 194.6m / s; the high-speed jet slurry quickly stirs the in-situ collapsed rock fragments and solidifies them into one, and the mixed solidified body is in the form of a round column; depending on the different rock fragments, the column diameter can reach 4m to 5m.

[0101] The intelligent drill can use the gravity sensor to automatically detect the lowest level in the injection range in real time, and transmit the lowest layer information back to the ground control console in time. The control console sends instructions to the rotary jetting system to perform injection grouting at the lowest position.

[0102] like Figure 3-7 As shown, this embodiment also provides a ground high-pressure jet filling device for mining subsidence areas, including: a drilling vehicle, a control console, a slurry stirring mechanism, a slurry booster, a slurry input pipeline, and a slurry output pipeline.

[0103] The drilling vehicle is crawler-type, and is mainly composed of a chassis, a bracket, a machine drill rod, a transfer device, and a hydraulic system. The chassis can rotate 360 ​​degrees in the horizontal plane, which greatly enhances the flexibility of the drilling vehicle; the brackets are respectively installed at the front and rear of the vehicle body, mainly to support and ensure the stability of the drilling vehicle body during formation drilling and injection filling of the subsidence area; the machine drill rod is hollow, and has the functions of both the drill rod and the grouting pipe; the transfer device is mainly used to adjust the output power of the drilling rig when drilling into the formation and injecting slurry; the hydraulic system provides a power source when the drilling rig drills into the formation and injects slurry.

[0104] Among them, the console is composed of two parts: hardware and software. The hardware includes a host, a high-speed single-chip microcomputer, and a display; the software controls light, electricity, magnetism, sound and other signals by adjusting and controlling the high-speed single-chip microcomputer, and then controls the start and stop of the drilling rig, the automatic preparation of slurry by the slurry stirring mechanism, the operation of the slurry booster and the slurry injection.

[0105] The slurry stirring mechanism is composed of a storage tank (device), a raw material conveying pipeline, a stirring power device, and a stirring tank. The storage tank is used to store the raw materials for slurry preparation, the raw material conveying pipeline is mainly used to convey the raw materials to the stirring tank, and when the stirring power device receives the command from the control console, it will drive the stirring tank to operate, thereby preparing a slurry with uniform texture.

[0106] The slurry injection booster is installed on the drilling vehicle, and its main function is to provide different pressures for the slurry injection according to the detection conditions of the subsidence area.

[0107] The slurry input pipeline is installed between the stirring mechanism and the slurry supercharger. The pipeline is subjected to a relatively low pressure and mainly bears the pressure of the slurry moving from the stirring tank to the supercharger section.

[0108] The slurry output pipeline is installed between the slurry booster and the drill pipe. The pipeline is subjected to a relatively high pressure, mainly the pressure of the slurry after being output from the booster.

[0109] As a preferred mode, the control console is configured to issue instructions to the mixing control system according to the feedback information from the exploration of the goaf, and then prepare slurries with different properties suitable for the actual situation of the goaf, wherein when the exploration result within the target filling position range is collapsed rock fragments, the control console issues a slurry preparation instruction to the slurry automatic configuration system, and when the exploration result within the target filling position range is a hollow area, the control console issues a silk slurry preparation instruction to the slurry automatic configuration system. The specific control steps of the control console are the same as the aforementioned technical method for the construction of in-situ large-diameter piers suitable for filling and treatment of mining subsidence areas, and will not be repeated here.

[0110] From the above description, it can be seen that the present invention of this embodiment can effectively solve the problems of unclear slurry flow direction, difficult to predict the shape of the filling body in the goaf, unsatisfactory effective connection range between the slurry stone body and the top plate of the goaf, large deviation between the filling volume and the design, serious waste of engineering materials, high engineering costs, etc. when the current slurry full filling method is adopted. While solving the above problems, it also expands the methods of goaf filling management.

[0111] Note that references in the specification to "one embodiment," "an embodiment," "an example embodiment," "some embodiments," etc. indicate that the described embodiments may include a particular feature, structure, or characteristic, but each embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases do not necessarily refer to the same embodiment. In addition, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, whether or not explicitly described, it would be within the knowledge of a person skilled in the art to implement such feature, structure, or characteristic in conjunction with other embodiments.

[0112] The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for constructing an in-situ large-diameter pier column for filling and treatment of coal mining subsidence areas, characterized in that: include: An information exploration and feedback step is used to obtain basic information of the goaf and feed it back to the control console, wherein the basic information includes the range of the goaf and the type of the goaf range; In the filling slurry configuration step, the control console issues instructions to the mixing control system according to the feedback information from the exploration of the goaf, and then configures slurries with different properties suitable for the actual conditions of the goaf. When the exploration result within the target filling position range is collapsed rock fragments, the control console issues a slurry configuration instruction to the slurry automatic configuration system; when the exploration result within the target filling position range is a hollow area, the control console issues a silk slurry configuration instruction to the slurry automatic configuration system; A pier jetting forming step, wherein the configured slurry is jetted into the goaf to form the pier; In the information exploration and feedback step, the goaf is scanned longitudinally, and the scanning results are recorded at predetermined intervals, and the scanning order is to scan from the bottom plate to the top plate of the goaf in sequence; On the same horizontal layer scanning trajectory, with the plane coordinate system as the reference and the laser scanning center point as the coordinate origin, the distance from the point on the scanning trajectory to the scanning center point is recorded once every predetermined azimuth angle and the average range of the plane closed loop trajectory obtained by the horizontal layer scanning is calculated; Determine the plane closed loop trajectory of each horizontal scanning layer based on the average range of the plane closed loop trajectory; In the filling slurry configuration step, if the longitudinal scanning result shows that a certain horizontal layer has more than one plane closed loop trajectory line, and the next adjacent horizontal layer also has more than one plane closed loop trajectory line, the filling slurry is selected according to the following different situations: The horizontal layer scanning result is hour, The horizontal layer scanning result is hour, The horizontal layer scanning result is hour, Among them, the average range of the innermost closed loop trajectory is recorded as It is used to represent the average coverage of the collapsed rock debris; the average coverage of the outermost closed loop trajectory is recorded as Used to indicate the average range of the outer perimeter of the void area; the design radius of the pier is denoted as L d ; Among them, the consistencies of the three slurries 1#, 2# and 3# decrease in sequence.

2. The in-situ large-diameter pier construction method for filling and treating coal mining subsidence areas according to claim 1 is characterized in that: In the filling slurry configuration step, if the scanning results of each horizontal scanning layer in the longitudinal scanning process show only one plane closed loop trajectory line, the goaf is directly judged to be a cavity type and filled with 1# slurry.

3. The in-situ large-diameter pier construction method for filling and treating coal mining subsidence areas according to claim 1 is characterized in that: In the filling slurry configuration step, if the longitudinal scanning result shows that a certain horizontal layer has more than one plane closed loop trajectory line, and the next adjacent horizontal layer has only one plane closed trajectory, 1# slurry is also directly used for filling.

4. The in-situ large-diameter pier construction method for filling and treating coal mining subsidence areas according to claim 1, 2 or 3, characterized in that: The ingredients of the 1# slurry are calculated by weight: 42.50.70-1.20 parts of ordinary Portland cement P·O; 0.80-1.10 parts of Class F II fly ash; 2.83-4.42 parts of medium sand; 0.65-1.43 parts of water; 0.09-0.12 parts of UEA expansion agent; 0.11-0.13 parts of slag powder; 0.0014-0.0015 parts of polyvinyl alcohol fiber; and 0.026-0.035 parts of accelerator.

5. The in-situ large-diameter pier construction method for filling and treating coal mining subsidence areas according to claim 1, 2 or 3, characterized in that: The 2# slurry comprises, by weight, 2.50.90-1.20 parts of ordinary Portland cement P·O 4; 0.60-1.00 parts of Class F, Grade II fly ash; 1.68-2.96 parts of medium sand; 0.96-2.06 parts of water; 0.10-0.13 parts of UEA expansion agent; 0.13-0.15 parts of slag powder; 0.0013-0.0014 parts of polyvinyl alcohol fiber; and 0.020-0.032 parts of accelerator.

6. The in-situ large-diameter pier construction method for filling and treating coal mining subsidence areas according to claim 1, 2 or 3, characterized in that: The 3# slurry comprises, by weight, 2.50.90-1.30 parts of ordinary Portland cement P·O 4; 0.35-0.80 parts of Class F, Grade II fly ash; 0.86-2.34 parts of medium sand; 1.20-2.65 parts of water; 0.12-0.15 parts of UEA expansion agent; 0.13-0.15 parts of slag powder; 0.0013-0.0014 parts of polyvinyl alcohol fiber; and 0.014-0.030 parts of accelerator.

7. A system for implementing the in-situ large-diameter pier construction method for filling and treating coal mining subsidence areas as described in any one of claims 1 to 6, characterized in that: include: Slurry stirring device (3), drilling vehicle (4), control console (5); The drilling vehicle (4) is provided with a slurry jetting booster (3-1), and the slurry jetting booster (3-1) is connected to the slurry stirring device (3) and the machine tool drill rod (4-2) through a slurry jetting input pipeline (3-2) and a slurry jetting output pipeline (3-3) respectively; The tool drill rod (4-2) is provided with a monitoring sensor probe (5-2), and the monitoring sensor probe (5-2) is connected to the control console (5) via a monitoring optical fiber (5-1); The slurry injection booster (3-1) injects slurry into the goaf through the slurry injection output pipeline (3-3) under the control of the control console (5).

8. The system according to claim 7, characterized in that The drilling vehicle is crawler-type and is mainly composed of a chassis, a bracket, a machine tool drill rod, a transfer device, and a hydraulic system.

9. The system according to claim 7, characterized in that The control console is configured to issue instructions to the stirring control system based on the feedback information from the goaf exploration, and then prepare slurries with different properties suitable for the actual conditions of the goaf, wherein when the exploration result within the target filling position range is collapsed rock fragments, the control console issues a thin slurry preparation instruction to the slurry automatic configuration system; and when the exploration result within the target filling position range is a hollow area, the control console issues a silk slurry preparation instruction to the slurry automatic configuration system.

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