Stope cemented filling body maintenance test system and use method thereof

Abstract

The invention relates to the technical field of mining engineering, in particular to a stope cemented filling body maintenance test system and a using method thereof, and the stope cemented filling body maintenance test system comprises a filling body maintenance system, a pressurization system, a temperature control system, a seepage control system, an environment monitoring system and a control system. The test of a plurality of filling body test blocks can be completed at one time, the surrounding temperature of the filling body can be accurately controlled, and the actual filling environment can be simulated in a laboratory by setting the maintenance condition which is the same as the actual environment of the filling body in a mine stope; pressure can be uniformly applied to the filling body slurry in the whole process from a solid-liquid mixed state to a solid state from all directions, and the mechanical property of the filling body in a stope in-situ environment can be more accurately predicted.

Description

Technical Field

[0001] The invention relates to the technical field of mining engineering, and in particular to a stope cemented filling body maintenance test system and a use method thereof. Background Art

[0002] At present, a lot of research has been conducted on the factors affecting the mechanical properties of mine fillings. It was found that the tailings cemented filling samples prepared in the laboratory ignored the influence of multi-physical field coupling factors such as temperature, pressure, pore water pressure, and drainage during the curing process of the tailings cemented filling in the mine. However, the current laboratory standard curing test ignores the influence of these factors on the strength of the cemented filling. The mechanical properties of the in-situ filling are significantly different from those of the conventionally cured filling samples with the same proportion. This phenomenon is not conducive to mine safety production.

[0003] The existing backfill curing devices are mostly based on single-factor curing, while some devices that consider multi-factor curing also require the backfill to be initially consolidated before curing, and cannot cure the backfill slurry in a solid-liquid mixed state. The existing methods also use a single indicator (such as uniaxial compressive strength) to reflect the mechanical properties of the backfill after curing, which cannot fully evaluate the actual mechanical properties of the backfill after curing, and there is no full-process evaluation mechanism under multi-factor and multi-physical field conditions. The pressurized curing module of the existing device is mainly to mechanically pressurize the upper part of the cylindrical mold with a fixed diameter. Since the pressure is only applied to the upper part of the specimen, the pressure cannot be normally transmitted to the surrounding of the specimen after consolidation, which is inconsistent with the in-situ environment of the backfilling mining site to be simulated. As a result, the pressure environment simulated by the experimental device does not actually reflect the actual environment of the backfilling mining site. In addition, due to different filling materials, the pressure distribution will also be different. The pressure will change dynamically during the drainage and consolidation of the backfill specimen. If it is not for the servo press to apply pressure, the pressure on the specimen cannot be accurately controlled. Too many uncontrollable factors make the reliability of the research results based on the existing device insufficient.

[0004] In addition, the study of the effect of temperature on the strength of the filling is generally carried out through a constant temperature curing room, or hot air temperature control. These methods are easily affected by the surrounding environment, causing uneven heating of the test blocks, and hot air will change the humidity of the environment around the filling, adding more uncontrollable factors.

[0005] In addition, the existing devices rarely set up the pore water pressure control module reasonably, mainly for the bottom drain valve to drain water, or even no drainage at all. In order to facilitate demoulding, the cylindrical mold of the curing part is divided into multiple petals, which makes the sealing of the curing mold insufficient, resulting in uneven pressure and unreliable test results. Under the same temperature and pressure conditions, the influence of different pore water pressures on the strength of tailings cemented backfill cannot be ignored. Therefore, based on the mechanical properties test results of the backfill samples prepared by the existing backfill curing device or the laboratory standard backfill curing mold, it is impossible to reliably predict the in-situ backfill strength of the mining site.

[0006] In addition, if we want to conduct subsequent mechanical research based on the test blocks cured by the device, a large number of test blocks are needed. The current device can only cure one block at a time. If we want more groups, we need multiple devices, which is time-consuming and labor-intensive. It is also difficult to control irrelevant variables by curing with different devices, making the experimental data unconvincing.

[0007] Accurately predicting the mechanical properties of tailings cemented backfill in the in-situ environment of the mine is an important prerequisite for ensuring the reasonable and economical design of mine backfill ratio parameters. The process of in-situ monitoring test of the mine to know the mechanical properties of the in-situ backfill is too complicated, difficult to carry out, costly and with poor repeatability. Therefore, it is very important to develop a new physical simulation test device to predict the mechanical properties of the in-situ backfill in the laboratory twin simulation of the in-situ maintenance environment of the mine. Summary of the invention

[0008] The object of the present invention is to provide a mining field cemented backfill maintenance test system, which can solve at least one of the technical problems mentioned in the background technology, for example: it can complete the test of multiple backfill test blocks at one time, can accurately control the temperature around the backfill, can simulate the actual filling environment in the laboratory by setting the same maintenance conditions as the actual environment of the mining field backfill, can evenly apply pressure to the backfill slurry from all directions from a solid-liquid mixed state to a solid state, and more accurately predict the mechanical properties of the backfill in the in-situ environment of the mining field.

[0009] Another object of the present invention is to provide a method for using a mine cemented backfill curing test system, which can solve at least one of the technical problems mentioned in the background technology, for example: it can complete the test of multiple backfill test blocks at one time, can accurately control the temperature around the backfill, can simulate the actual backfilling environment in the laboratory by setting the same curing conditions as the actual environment of the mine backfill, can evenly apply pressure to the backfill slurry from all directions from a solid-liquid mixed state to a solid state, and more accurately predict the mechanical properties of the backfill in the in-situ environment of the mine.

[0010] The technical solution of the present invention is achieved in this way: A stope cemented filling body maintenance test system, comprising: The backfill body maintenance system has a modular design and can be disassembled and replaced, and is used to simulate and control the maintenance conditions of the backfill body in the actual mine environment; the backfill body maintenance system includes a maintenance water tank and multiple maintenance units inside the maintenance water tank; A pressurizing system, used for applying pressure to the curing water tank; A temperature control system, disposed in the curing water tank, for controlling the temperature of the water in the curing water tank; Seepage control system, used to control the pore water pressure inside the filling slurry to simulate the drainage conditions in the actual mine environment; Environmental monitoring system, used to monitor the curing environment around the filling test block in real time, providing comprehensive and accurate data support for the performance analysis of the filling test block; A control system, wherein the pressurization system, the temperature control system, the seepage control system, and the environmental monitoring system are electrically connected to the control system respectively, and the control system is used for automatic control and data processing.

[0011] Furthermore, the maintenance water tank comprises an upper water tank body and a lower circular base, the water tank body and the circular base are detachably connected, and the circular base is provided with a plurality of mounting positions for connecting the maintenance base; The curing unit comprises a curing base, a curing mould, a curing sample sealing block and a sealing rubber ring. The curing base is detachably connected to the mounting position of the circular base, and the curing mould is tightly sleeved on the curing base. The curing mould is a cylindrical PVC mesh cloth. The curing mould is used to inject filling slurry, and the curing sample sealing block is placed on the top of the filling slurry in the curing mould. A plurality of sealing rubber rings are clamped on the outside of the curing mould. The curing sample sealing block and the sealing rubber ring are used together to isolate the filling slurry from the water in the curing water tank.

[0012] Furthermore, the pressurizing system includes an ultrapure water preparation device, a water pumping device and a water pressure pressurizing device. The ultrapure water preparation device is used to prepare ultrapure water to protect the long-term stability of the pressurizing system. The water pumping device is connected to the water injection hole of the maintenance water tank through a hose. The water pressure pressurizing device is connected to the pressurizing hole of the maintenance water tank and can pressurize the maintenance water tank according to a specified pressure.

[0013] Furthermore, the temperature control system includes a temperature sensor and a heating limit coil. The temperature sensor is arranged inside the maintenance water tank to detect the water temperature and feed back to the environmental monitoring system control and the control system, and then the control system controls the heating limit coil to heat the water temperature to the set temperature.

[0014] Furthermore, the seepage control system includes a pore water pressure controller and a flow meter, wherein the pore water pressure controller is used to control the pore water pressure inside the filling slurry, and the flow meter is used to measure the seepage flow rate.

[0015] Furthermore, the environmental monitoring system includes a water pressure sensor, a pore water pressure sensor and a sensor data collector. The water pressure sensor and the pore water pressure sensor are electrically connected to the control system through the sensor data collector respectively. The sensor data collector is used to monitor and record the status and maintenance environment of the filling body in real time and upload them to the control system.

[0016] Furthermore, it also includes a feedback regulation system, and the pressurization system, the temperature control system and the seepage system use water as the medium to quantitatively control the water temperature, water pressure and pore water pressure in the curing water tank through the feedback regulation system, and simulate the in-situ environmental curing of multiple filling body specimens from non-consolidation to consolidation through the curing unit.

[0017] Furthermore, the control system includes a display and a computer host, the display is electrically connected to the computer host, and the pressurization system, the temperature control system, the seepage control system, and the environmental monitoring system are electrically connected to the computer host respectively.

[0018] A method for using the stope cemented filling body maintenance test system comprises the following steps: S1. Prepare filling slurry: prepare filling slurry according to the actual situation of the mine or scientific research needs; S2. Install the filling body maintenance test system; S3. Install the maintenance water tank; S4, water injection: inject full ultrapure water into the curing water tank; S5, setting pressure and temperature: setting the pressure value and temperature value in the curing water tank according to the actual mine environment to be simulated through the pressurizing system and the temperature control system; S6. Setting pore water pressure: setting pore water pressure according to the actual environment of the mine to be simulated through the seepage control system; S7. Maintenance: Determine the maintenance age according to the actual research needs; S8. Monitoring and recording data: During the curing process, the environmental monitoring system and various sensors are used to monitor and record the curing environment and the filling body status in real time, and the data is transmitted to the control system in real time; S9. Test the mechanical properties of the cured specimens: after curing, conduct uniaxial compression test, triaxial compression test and shear test on the specimens; S10. Data analysis and interpretation of results.

[0019] Furthermore, in step S10, the mechanical properties of the cured specimens obtained from the test are input into the control system for analysis and processing together with the data collected by the control system, so as to study the influence of different environmental factors on the mechanical properties of the filling body under multi-field coupling conditions, evaluate the mechanical properties of the filling body specimens in the in-situ curing environment, and judge whether the design strength of the filling body is appropriate in the actual mining environment based on the analysis results, so as to provide theoretical data support for the subsequent optimization of the filling material ratio and curing process.

[0020] Compared with the prior art, the present invention has the following beneficial effects: The present application can prepare filling slurry according to the actual needs of the mine and the ash-sand ratio and mass concentration of the mine filling material, pour a certain amount of filling slurry into the curing unit and keep it sealed, and then inject full ultrapure water into the curing water tank, and set the pressure value and temperature value in the curing water tank according to the actual mine environment to be simulated through the pressurization system and the temperature control system; set the pore water pressure according to the actual mine environment to be simulated through the seepage control system; and then determine the curing days for curing according to actual research needs; during the curing process, monitor and record the curing environment and the state of the filling body in real time through the environmental monitoring system and various sensors, and transmit the data to the control system in real time; after the curing, carry out uniaxial compression test, triaxial compression test and shear test on the specimen (note: when using a non-axial pressure mold) When using a curing water tank for blocks, it is usually necessary to take out the specimens for uniaxial compression test, triaxial compression test and shear test; when using a curing water tank with an axial pressure module, it is also possible to cooperate with the press to carry out uniaxial compression test, triaxial compression test and shear test without taking out the specimens, so as to eliminate the influence on the specimens during the process of taking out the specimens); finally, data analysis and result interpretation are carried out: the mechanical properties of the curing specimens obtained from the test are input into the control system and analyzed and processed with the data collected by the control system, the influence of different environmental factors on the mechanical properties of the filling body under multi-field coupling conditions is studied, the mechanical properties of the filling body test block under the in-situ curing environment are evaluated, and whether the design strength of the filling body in the actual environment of the mine is appropriate is judged according to the analysis results, so as to provide theoretical data support for the subsequent optimization of the filling material ratio and curing process.

[0021] In summary, through the curing test system of cemented filling in the mine, multiple curing units are set in the curing water tank, and the test of multiple filling test blocks can be completed at one time. The water pressure can evenly apply pressure to the filling slurry from the solid-liquid mixed state to the solid state from all directions. By setting the same curing conditions as the actual environment of the filling body in the mine mine (such as water temperature, water pressure, and pore water pressure in the curing water tank), the actual filling environment can be simulated in the laboratory, and the mechanical properties of the filling body in the in-situ environment of the mine can be more accurately predicted. In terms of actual mining production, it is more convenient to study the influence of multi-physical fields on the mechanical properties of the filling body in the actual mine mine, replace conventional curing methods, and more accurately predict the mechanical properties of the tailings cemented filling body in the in-situ environment of the mine, thereby ensuring that the design of mine filling ratio parameters is more reasonable and economical. In terms of theoretical research, the built-in environmental monitoring system and sensors can monitor the environmental conditions around the filling body test blocks in real time, providing comprehensive and accurate data support for the performance analysis of the filling body test blocks. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 It is a schematic diagram of the overall structure of the stope cemented filling body maintenance test system of the present invention (there is no axial pressure module on the top of the maintenance water tank); Figure 2 It is a schematic diagram of the overall structure of the stope cemented filling body curing test system of the present invention (there is an axial pressure module on the top of the curing water tank); Figure 3 This is a schematic diagram of the overall structure of the maintenance water tank of the present invention (there is no axial pressure module on the top of the maintenance water tank); Figure 4 For the present invention Figure 3 Schematic diagram of the structure of the middle maintenance water tank after it is unfolded; Figure 5 This is a schematic diagram of the overall structure of the curing water tank of the present invention (there is an axial pressure module on the top of the curing water tank); Figure 6 It is a structural schematic diagram of the circular base of the present invention; Figure 7 It is a partial structural schematic diagram of the maintenance unit; Figure 8 This is a schematic structural diagram of a sealing block for curing a sample according to the present invention; Fig. 9 It is a structural schematic diagram of the curing mold of the present invention; Fig.10 It is a structural schematic diagram of the sealing screw plug of the present invention; Fig.11 This is a schematic diagram of the structure of the curing box fixing the rotary rod of the present invention; Fig.12 It is a structural schematic diagram of the curing water tank (without axial pressure module) of the present invention; Fig.13 It is a structural schematic diagram of the curing water tank (with an axial pressure module) of the present invention; Fig.14 It is a structural schematic diagram of the axial pressure module of the present invention.

[0024] In the figure: 1-filling body maintenance system; 2-control system; 3-environmental monitoring system; 4-water pressure device; 5-ultrapure water preparation device; 6-water pumping device; 7-temperature control system; 701-heating limit coil; 8-seepage control system; 9-equipment power supply; 11-maintenance water tank; 111-sealing screw plug; 112-round base; 1121-water storage chamber; 1122-installation position; 113-cover body; 114-cylinder body; 115-bottom plate; 12-curing unit; 121-curing base; 122-curing sample sealing block; 123-curing mold; 124-sealing rubber ring; 13-Maintenance box fixing rotating rod; 14-Axial pressure module. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0029] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0032] Example 1 Site cementation refers to a mining method in which solid wastes such as waste rock and tailings generated during ore mining are mixed with a binder and water in a certain proportion and then backfilled into the underground goaf. This method has significant advantages such as high safety and environmental protection.

[0033] Reference Figure 1-Figure 14 This embodiment provides a stope cemented filling body maintenance test system (such as Figure 1 As shown, Figure 1 The top of the maintenance water tank 11 has no axial pressure module 14), which includes: The backfill body maintenance system 1 has a modular design and can be disassembled and replaced, and is used to simulate and control the maintenance conditions of the backfill body in the actual mine environment; the backfill body maintenance system 1 includes a maintenance water tank 11 and a maintenance unit 12 inside the maintenance water tank 11; A pressurizing system, used to apply pressure to the curing water tank 11; A temperature control system 7, disposed in the curing water tank 11, for controlling the temperature of the water in the curing water tank 11; Seepage control system 8, used to control the pore water pressure inside the filling slurry to simulate the drainage conditions in the actual mine environment; Environmental monitoring system 3, used to monitor the curing environment around the filling test block in real time, and provide comprehensive and accurate data support for the performance analysis of the filling test block; The control system 2, the pressurization system, the temperature control system 7, the seepage control system 8, and the environmental monitoring system 3 are electrically connected to the control system 2 respectively, and the control system 2 is used for automatic control and data processing.

[0034] Specifically: the filling body curing system 1 includes a curing water tank 11 ( Figure 3 ) and a curing unit 12 inside the curing water tank 11, wherein the curing water tank 11 includes an upper water tank body (with a bottom opening, such as Fig.12 ) and the lower circular base 112 (such as Figure 6 ), the water tank body includes a cover body 113, a cylinder body 114 and an annular bottom plate 115 which are sealed and connected in sequence from top to bottom, and the cover body 113, the cylinder body 114 and the bottom plate 115 are fixed by welding or are an integrally formed structure to achieve sealing therebetween, the outer dimensions of the cover body 113 and the bottom plate 115 are respectively larger than the outer dimensions of the cylinder body 114, and a plurality of through holes for the maintenance box fixing rotary rod 13 to pass through are respectively provided on the cover body 113 and the bottom plate 115, and a plurality of threaded holes matching the external threads of the maintenance box fixing rotary rod 13 are correspondingly provided on the circular base 112, and the maintenance box fixing rotary rod 13 passes through the cover body 113, the bottom plate 115 and the circular base 112 in sequence to achieve threaded connection and fixation between the water tank body and the circular base 112, so that the upper and lower parts of the maintenance water tank 11 are connected by a plurality of maintenance box fixing rotary rods 13 (refer to Figure 1 , Figure 3 ) are connected and fixed together, and a water tank sealing rubber ring is provided at the overlapping joint between the water tank body and the circular base 112 to ensure the overall sealing of the maintenance water tank 11; the cover 113 of the maintenance water tank 11 (the top of the maintenance water tank 11 has no axial pressure module 14) corresponds to the top opening of the cylinder 114. High-pressure transparent glass is used for the part, so that the internal situation of the maintenance water tank 11 can be observed. Two circles of polymer tensile binding belts are arranged around the transparent glass to improve the pressure-bearing capacity of the transparent glass. The transparent glass and the binding belt are surrounded by insulation materials during the experimental insulation stage to reduce the interference of the external temperature environment on the temperature feedback regulation system. Four screw plug holes are provided on the top of the cover 113 of the maintenance water tank 11, and four sealing screw plugs 111 ( Figure 3 and Fig.10) It is convenient to add water into the maintenance water tank 11 to balance the air pressure and remove the air in the maintenance water tank 11.

[0035] The maintenance unit 12 includes a maintenance base 121 ( Figure 4 and Figure 6 )、curing mold 123, sealing rubber ring 124 and curing sample sealing block 122 ( Figure 8 ), the maintenance base 121 is detachably connected to the circular base 112, a water chamber 1121 is provided on the top of the circular base 112, after the circular base 112 is fixedly connected to the water tank body, the water chamber in the circular base 112 is sealed and connected to the inner cavity of the water tank body, seven mounting positions 1122 for detachably connecting the maintenance base 121 are provided at the bottom of the water chamber 1121 (the seven mounting positions 1122 include one at the center and six on the outer circle), at most seven maintenance bases 121 can be connected to the circular base 112, two small holes are provided on the circular base 112 to connect the water chamber 1121 to the external atmosphere, and the two small holes are connected to the seepage control The control system 8 is used to control the internal pore water pressure of the filling slurry. The curing mold 123 is a cylindrical PVC mesh cloth, which has the properties of soft PVC material and convenient water pressure transmission. The internal interlayer has a high-strength tensile fiber mesh to prevent the filling slurry from causing tensile deformation to the curing mold 123. After the multiple curing units 12 are installed in the installation position 1122 of the circular base 112, they are installed in the water tank body from the bottom of the water tank body upward, and then the circular base 112 and the water tank body are connected by multiple curing box fixed rotating rods 13, and the joint between the circular base 112 and the water tank body is sealed by the water tank sealing rubber ring. The curing base 121 (can be made of stainless steel), the curing mold 123, the curing sample sealing block 122 (can be made of transparent resin material) and the sealing rubber ring 124 together form the curing unit 12 to isolate the filling slurry from the water in the curing water tank 11.

[0036] Note: If axial pressure needs to be applied to the specimen according to actual requirements, Fig.10 The water tank body of the upper part of the maintenance water tank 11 is replaced by Fig.11 The water tank body of the maintenance water tank 11 shown in the figure (the water tank body is provided with an axial pressure module 14), the axial pressure module 14 is connected by six axial pressure rods (such as Fig.12 ) The bottom protrusion can be connected with the curing sample sealing block 122 (such as Figure 7 ) overlap the fixed axis to apply downward axial pressure to the curing sample sealing block 122.

[0037] The pressurizing system includes an ultrapure water preparation device 5, a water pumping device 6, and a water pressure pressurizing device 4, wherein the ultrapure water preparation device 5 is used to prepare ultrapure water to protect the long-term stability of the pressurizing system, the water pumping device 6 is sealedly connected to the water injection hole of the maintenance water tank 11 through a PVC hose for injecting water into the maintenance water tank 11, and after the maintenance water tank 11 is filled with water, the water pressure pressurizing device 4 is connected to pressurize the maintenance water tank 11 according to the specified pressure through the water pressure pressurizing device 4.

[0038] The temperature control system 7 includes a temperature sensor and a heating limit coil 701, and the heating limit coil 701 is wound around the outer side of the curing mold 123 (such as Figure 5 The spiral part in the maintenance water tank 11 is provided with a temperature sensor to detect the water temperature and feed it back to the environment monitoring system 3 and the control system 2. The control system 2 then controls the operation of the heating limit coil 701 to heat the water temperature to the set temperature. At the same time, the heating limit coil 701 plays a role in properly supporting the maintenance unit 12.

[0039] The seepage control system 8 includes a pore water pressure controller and a flow meter. The pore water pressure controller is used to control the pore water pressure inside the filling slurry, and the flow meter is used to measure the seepage flow rate.

[0040] The environmental monitoring system 3 includes a water pressure sensor, a pore water pressure sensor and a sensor data acquisition instrument. The water pressure sensor and the pore water pressure sensor are electrically connected to the control system 2 through the sensor data acquisition instrument respectively. The sensor data acquisition instrument is used to monitor and record the status and maintenance environment of the filling body in real time and upload them to the control system 2.

[0041] The control system 2 includes a display and a computer host, the display is electrically connected to the computer host, the pressurization system, the temperature control system 7, the seepage control system 8, and the environmental monitoring system 3 are electrically connected to the computer host, the computer host is used for automatic control and data processing, and the display is used for displaying data. The maintenance test system also includes an equipment power supply 9, which is used to power each system in the entire test system.

[0042] The pressurization system, the temperature control system 7 and the seepage control system 8 quantitatively control the water temperature, water pressure and pore water pressure through the feedback regulation system and with water as the medium, and simulate the in-situ environmental maintenance of multiple filling body specimens from non-consolidation to consolidation through the maintenance unit 12.

[0043] Example 2 The method for using the stope cemented filling body maintenance test system comprises the following steps: S1, preparing filling slurry: preparing filling slurry according to the actual situation of the mine or the needs of scientific research; S2, install the filling and curing system: tightly fit the curing mold 123 on the curing base 121, pour a certain amount of filling slurry into it, put the curing sample sealing block 122 on the top, and then use multiple elastic sealing rubber rings 124 to clamp and seal to isolate the filling slurry from water; S3, installing the maintenance water tank 11: placing the water tank body and the water tank body of the maintenance water tank 11 on the maintenance base 121 (selecting the water tank body with the axial pressure module 14 or the water tank body without the axial pressure module 14 according to the needs), installing the water tank sealing rubber ring and the sealing spiral rod to fix the water tank body and the circular base 112 and seal the maintenance water tank 11; S4, water filling: unscrew the sealing screw plug 111, use the water pumping device 6 to pump ultrapure water into the curing water tank 11 to fill the curing water tank 11 with water as much as possible, and then tighten the sealing screw plug 111; S5, setting pressure and temperature: the curing water tank 11 is connected to a water pressurizing device, and the pressure value and temperature value in the curing water tank 11 are set according to the actual mine environment to be simulated; S6, setting pore water pressure: connect the pore water pressure controller and set the pore water pressure according to the actual mine environment to be simulated; S7, maintenance: Determine the maintenance age according to the actual research needs; S8, monitoring and recording data: During the curing process, the curing environment and the filling body status are monitored and recorded in real time through the environmental monitoring system 3 and sensors, and the data are transmitted to the control system 2 in real time; S9, test the mechanical properties of the cured specimens: after the curing, take out the specimens and conduct uniaxial compression test, triaxial compression test and shear test; S10, data analysis and result interpretation: The mechanical properties of the cured specimens obtained from the test are input into the control system 2 for analysis and processing together with the data collected by the control system 2, the influence of different environmental factors on the mechanical properties of the filling body under multi-field coupling conditions is studied, the mechanical properties of the filling body specimens under the in-situ curing environment are evaluated, and whether the design strength of the filling body is appropriate in the actual mining environment is determined based on the analysis results, so as to provide theoretical data support for the subsequent optimization of the filling material ratio and curing process.

[0044] It should be noted that when testing the mechanical properties of the curing specimen in the above step S9: when a curing water tank without an axial pressure module is used, it is usually necessary to take out the specimen for uniaxial compression test, triaxial compression test and shear test; when a curing water tank with an axial pressure module is used, although the specimen can be taken out for testing, it is also possible to carry out uniaxial compression test, triaxial compression test and shear test in cooperation with a press without taking out the specimen, so as to eliminate the influence on the specimen during the process of taking out the specimen and improve the accuracy of the test results.

[0045] Compared with the prior art, the beneficial effects of the present invention are: 1. It includes a stable, controllable and uniform pressure and temperature control system 7: water is used as the medium to control the pressure and temperature, the specimen is evenly stressed and heated during curing, the curing pressure and temperature can be adjusted at any time, and the temperature and pressure of the water-controlled system are simple and easy to operate.

[0046] 2. Real-time monitoring and control of the curing environment: The built-in multiple sensor joint control system 2 can monitor the temperature, pressure and pore water pressure of the curing environment in real time, and can adjust the curing environment parameters and collect data at any time as needed, providing theoretical data support for studying the influence of different environmental factors on the mechanical properties of the filling body under multi-field coupling conditions.

[0047] 3. Eliminate the problem of uneven stress transmission caused by mechanically applied pressure: After the filling body is cemented, the mechanical pressure cannot be transmitted evenly and normally, and the original environment of the filling site to be simulated is not in line with the requirements. The uniform nature of water pressure solves this problem well.

[0048] 4. Consider the control of multi-factor curing conditions: Existing filling body curing devices are mostly based on single-factor curing. This device takes into account the influence of pressure, temperature, pore water pressure, drainage, etc., and isolates the external environment to maintain constant humidity. The precise control of multi-physical field factors improves the reliability and research value of subsequent test data.

[0049] 5. Curing of multiple specimens at one time under exactly the same curing conditions: Abandoning the limitation of traditional mechanical pressurization that a set of mechanical pressurization equipment can only press one specimen, multiple curing units 12 are set in the curing water tank 11 to simultaneously cure multiple filling specimens, providing sufficient data support for subsequent research and analysis.

[0050] 6. In-situ curing throughout the entire process: It can simulate the conditions in the actual mining environment, from the time when the filling material is in a solid-liquid mixed state to the time when it is fully cemented to form a solid state. 7. Expandable and modular: The size and function of the maintenance unit 12 can be quickly changed according to the needs, meeting the diverse needs of scientific research and mining. The water tank body of the upper part of the maintenance water tank 11 is modular and can be flexibly replaced (divided into a water tank body with an axial pressure module and a water tank body without an axial pressure module 14). The water tank body with an axial pressure module or without an axial pressure module 14 can be selected according to the needs.

[0051] 8. Automated information processing: After the test system is installed and the conditions are set, it can automatically maintain the set environmental conditions to collect and analyze data in real time, which is smarter and more efficient.

[0052] 9. In addition, the existing curing devices do not have a device that can apply both ambient pressure curing and axial pressure curing to the cylindrical specimens. In the test system of the present application, the curing mold 123 is designed to be cylindrical, which can solve this problem through the ambient water pressure and the axial pressure of the axial pressure module 14.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A stope cemented filling body maintenance test system, characterized in that: include: A filling body maintenance system (1) having a modular design and capable of being disassembled and replaced, and used for simulating and controlling the maintenance conditions of the filling body in an actual mine environment; the filling body maintenance system (1) comprises a maintenance water tank (11) and a plurality of maintenance units (12) inside the maintenance water tank (11); A pressurizing system, used for applying pressure to the curing water tank (11); A temperature control system (7), arranged in the curing water tank (11), and used for controlling the temperature of water in the curing water tank (11); A seepage control system (8) for controlling the pore water pressure inside the filling slurry to simulate the drainage conditions in the actual mine environment; Environmental monitoring system (3), used to monitor the curing environment around the filling test block in real time, and provide comprehensive and accurate data support for the performance analysis of the filling test block; The control system (2) is electrically connected to the pressure control system, the temperature control system (7), the seepage control system (8), and the environmental monitoring system (3), respectively, and the control system (2) is used for automatic control and data processing.

2. The stope cemented filling body maintenance test system according to claim 1, characterized in that: The maintenance water tank (11) comprises an upper water tank body and a lower circular base (112); the water tank body and the circular base (112) are detachably connected, and the circular base (112) is provided with a plurality of mounting positions (1122) for connecting to the maintenance base (121); The curing unit (12) comprises a curing base (121), a curing mold (123), a curing sample sealing block (122) and a sealing rubber ring (124); the curing base (121) is detachably connected to the mounting position (1122) of the circular base (112), and the curing mold (123) is tightly sleeved on the curing base (121); the curing mold (123) is a cylindrical PVC mesh cloth; the curing mold (123) is used to inject filling slurry, and the curing sample sealing block (122) is placed on the top of the filling slurry in the curing mold (123); a plurality of the sealing rubber rings (124) are tightly clamped on the outside of the curing mold (123); the curing sample sealing block (122) and the sealing rubber ring (124) are used together to isolate the filling slurry from the water in the curing water tank (11).

3. The stope cemented filling body maintenance test system according to claim 1, characterized in that: The pressurizing system comprises an ultrapure water preparation device (5), a water pumping device (6) and a water pressure pressurizing device (4). The ultrapure water preparation device (5) is used to prepare ultrapure water to protect the long-term stability of the pressurizing system. The water pumping device (6) is connected to the water injection hole of the maintenance water tank (11) through a hose. The water pressure pressurizing device (4) is connected to the pressurizing hole of the maintenance water tank (11) and can pressurize the maintenance water tank (11) according to a specified pressure.

4. The stope cemented filling body maintenance test system according to claim 1, characterized in that: The temperature control system (7) comprises a temperature sensor and a heating limit coil (701). The temperature sensor is arranged inside the maintenance water tank (11) and is used to detect the water temperature and provide feedback to the environmental monitoring system (3) and the control system (2). The control system (2) then controls the heating limit coil (701) to heat the water temperature to a set temperature.

5. The stope cemented filling body maintenance test system according to claim 1, characterized in that: The seepage control system (8) comprises a pore water pressure controller and a flow meter, wherein the pore water pressure controller is used to control the pore water pressure inside the filling slurry, and the flow meter is used to measure the seepage flow rate.

6. The stope cemented filling body maintenance test system according to claim 1, characterized in that: The environmental monitoring system (3) comprises a water pressure sensor, a pore water pressure sensor and a sensor data acquisition instrument. The water pressure sensor and the pore water pressure sensor are electrically connected to the control system (2) through the sensor data acquisition instrument respectively. The sensor data acquisition instrument is used to monitor and record the state of the filling body and the maintenance environment in real time and upload them to the control system (2).

7. The stope cemented filling body maintenance test system according to claim 1, characterized in that: It also includes a feedback regulation system, wherein the pressurizing system, the temperature control system (7) and the seepage system quantitatively control the water temperature, water pressure and pore water pressure in the curing water tank (11) using water as a medium through the feedback regulation system, and achieves in-situ environmental curing of multiple filling body specimens from non-consolidation to consolidation through the curing unit (12).

8. The stope cemented filling body maintenance test system according to claim 1, characterized in that: The control system (2) comprises a display and a computer host, the display is electrically connected to the computer host, and the pressurization system, the temperature control system (7), the seepage control system (8), and the environmental monitoring system (3) are electrically connected to the computer host, respectively.

9. A method for using the stope cemented filling body maintenance test system according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Prepare filling slurry: prepare filling slurry according to the actual situation of the mine or scientific research needs; S2. Install the filling body maintenance test system; S3, installing a maintenance water tank (11); S4, water injection: injecting full ultrapure water into the curing water tank (11); S5, setting pressure and temperature: setting the pressure value and temperature value in the curing water tank (11) according to the actual environment of the mine to be simulated through the pressurizing system and the temperature control system (7); S6, setting pore water pressure: setting the pore water pressure according to the actual environment of the mine to be simulated through the seepage control system (8); S7. Maintenance: Determine the maintenance age according to the actual research needs; S8. Monitoring and recording data: During the curing process, the curing environment and the filling body status are monitored and recorded in real time through the environmental monitoring system (3) and various sensors, and the data are transmitted to the control system (2) in real time; S9. Test the mechanical properties of the cured specimens: after curing, conduct uniaxial compression test, triaxial compression test and shear test on the specimens; S10. Data analysis and interpretation of results.

10. The method of use according to claim 9, characterized in that: In step S10, the mechanical properties of the cured specimen obtained by the test are input into the control system (2) and analyzed and processed together with the data collected by the control system (2), so as to study the influence of different environmental factors on the mechanical properties of the filling body under the multi-field coupling condition, evaluate the mechanical properties of the filling body specimen under the in-situ curing environment, and judge whether the design strength of the filling body in the actual mine environment is appropriate based on the analysis results, so as to provide data support for the subsequent optimization of the filling material ratio and the curing process.

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