CN111622807A - Mine in-situ filling body mechanical evaluation system and method - Google Patents
Mine in-situ filling body mechanical evaluation system and method Download PDFInfo
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- CN111622807A CN111622807A CN202010740787.0A CN202010740787A CN111622807A CN 111622807 A CN111622807 A CN 111622807A CN 202010740787 A CN202010740787 A CN 202010740787A CN 111622807 A CN111622807 A CN 111622807A
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- 238000011156 evaluation Methods 0.000 title claims abstract description 38
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- 238000007405 data analysis Methods 0.000 claims abstract description 25
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
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Abstract
The invention provides a mine in-situ filling body mechanical evaluation system and a method, and relates to the technical field of in-situ filling body mechanical evaluation, wherein the mine in-situ filling body mechanical evaluation system provided by the invention comprises an in-situ mechanical testing device, a data acquisition instrument and a cloud data analysis unit which are sequentially connected; the in-situ mechanical testing device is used for acquiring a plurality of mechanical parameters of the in-situ filling body and transmitting the mechanical parameters to the data acquisition instrument; the data acquisition instrument is used for receiving a plurality of mechanical parameters and establishing a mechanical information database; and the cloud data analysis unit is used for analyzing and evaluating parameters in the mechanical information database in real time and giving an early warning. The mine in-situ filling body mechanical evaluation system provided by the invention is suitable for analyzing and accurately evaluating the mechanical property of the in-situ filling body in real time in the full-time process (filling stage, maintenance stage and bearing stage), has strong universality and integrates multi-parameter acquisition and processing, and can provide theoretical and technical support for the aspect of filling mining safety production.
Description
Technical Field
The invention relates to the technical field of in-situ filling body mechanical evaluation, in particular to a mine in-situ filling body mechanical evaluation system and a mine in-situ filling body mechanical evaluation method.
Background
The filling mining method has the advantages that other mining methods cannot replace the filling mining method in the aspects of improving the mining rate of a mine, reducing the dilution rate, controlling the ground pressure, reducing the discharge of industrial solid wastes and the like. At present, the traditional filling design method is still adopted in domestic and foreign mines, namely, a filling proportioning test is developed in the surface laboratory environment, and the strength of the test block in the 28d maintenance period is tested. Because the filling slurry of the underground stope is different from that of an earth surface laboratory in the flowing deposition, consolidation and maintenance processes, the in-situ filling body shows non-uniform characteristics, the in-situ strength distribution is discrete and has a larger difference with the design strength, so that technicians have certain blindness in the aspects of underground filling retaining wall arrangement, filling body strength design and quality control, and huge hidden dangers are brought to the safety production of the filled mine.
In addition, in the prior art, an in-situ filling body stress testing instrument usually adopts a soil pressure cell, is simple to bury and is suitable for measuring the compressive stress of soil bodies in structures such as earth and rockfill dams, earth dikes, side slopes, roadbed and the like for a long time, is matched with a portable manual reading instrument for use, can directly display the stress value, and is simple and visual in measurement. However, the soil pressure cell can only test the one-way stress of the soil body, and cannot test the mechanical properties of the in-situ filling body with multiple parameters, and the filling slurry is a mixture of tailings, cement and water, and is different from the conventional contact medium soil body of the soil pressure cell, so that the pressure surface of the soil pressure cell cannot be completely contacted with the filling body, the precision of test data is low, and the continuous acquisition of the test data cannot be realized.
Disclosure of Invention
The invention aims to provide a mechanical evaluation system and a method for a mine in-situ filling body, which are suitable for analyzing and accurately evaluating the mechanical property of the in-situ filling body in real time in the full-time (filling stage, maintenance stage and bearing stage) process, have strong universality and integration of multi-parameter acquisition and processing, and can provide theoretical and technical support for the aspect of filling mining safety production.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, the invention provides a mine in-situ filling body mechanical evaluation system, which comprises an in-situ mechanical testing device, a data acquisition instrument and a cloud data analysis unit which are sequentially connected;
the in-situ mechanical testing device is used for acquiring a plurality of mechanical parameters of the in-situ filling body and transmitting the mechanical parameters to the data acquisition instrument;
the data acquisition instrument is used for receiving a plurality of mechanical parameters and establishing a mechanical information database;
and the cloud data analysis unit is used for analyzing and evaluating parameters in the mechanical information database in real time and giving an early warning.
Further, the in-situ mechanical testing device comprises a frame and a plurality of sensors mounted on the frame.
Further, the plurality of sensors includes at least two of a vibrating wire stress sensor, a pore water pressure sensor, a matrix suction sensor, a temperature-humidity-conductance integrated sensor, and a tilt meter.
Furthermore, the vibrating wire stress sensor comprises a pressure-bearing circular shell, a stress induction module and a temperature compensation module positioned in the stress induction module, wherein the stress induction module is connected with the pressure-bearing circular shell.
Further, the outer surface of the frame is in a cubic structure.
Further, the vibrating wire stress sensors are configured to be three, the three vibrating wire stress sensors are respectively installed on different surfaces of the frame, and the surfaces on which the three vibrating wire stress sensors are installed are orthogonal;
the pore water pressure sensor is arranged on the side surface of the frame and is vertically arranged;
the inclination measuring instrument is arranged at the bottom of the frame;
the substrate suction sensor and the temperature-humidity-conductivity integrated sensor are both arranged on the side of the inclination measuring instrument.
Furthermore, the in-situ mechanical testing devices are multiple in configuration, the multiple in-situ mechanical testing devices are connected with one end of a multi-core cable through a wiring terminal, and the other end of the multi-core cable is connected with the data acquisition instrument.
The invention also provides a mine in-situ filling body mechanical evaluation method adopting the mine in-situ filling body mechanical evaluation system, which comprises the following steps:
the in-situ mechanical testing device is placed at a preset position of the goaf to be filled in advance;
in the full-time process of the underground in-situ filling body, the in-situ mechanical testing device acquires a plurality of mechanical parameters of the in-situ filling body and transmits the mechanical parameters to the data acquisition instrument;
the data acquisition instrument establishes a mechanical information database;
the cloud data analysis unit analyzes and evaluates various mechanical parameters in the mechanical information database in real time, monitors the mechanical state of the in-situ filling body according to a preset stress early warning value, and automatically alarms once the mechanical parameters monitored in real time reach an early warning condition.
Further, the full time sequence comprises a filling stage, a maintenance stage and a bearing stage;
in the filling stage and the maintenance stage, the cloud data analysis unit establishes a matrix suction-temperature-water content-conductivity cooperative characterization method to evaluate the internal mechanical property of the in-situ filling body;
in the bearing stage, the cloud data analysis unit establishes a three-dimensional stress-pore water pressure two-index collaborative characterization method, and evaluates the internal mechanical property of the in-situ filling body.
Further, the preset stress early warning value comprises:
pouring the filling slurry into a cube test mold, removing the mold, then placing the cube test mold into a standard curing box for curing, wherein the curing conditions are the actual temperature and humidity of an underground stope, and after the test piece is cured, performing mechanical strength test to obtain the uniaxial compressive strength value of the full stress-strain curve of the filling body, namely the stress early warning value of the in-situ filling body.
The mine in-situ filling body mechanical evaluation system and method provided by the invention can have the following beneficial effects:
when the mine in-situ filling body mechanical evaluation system is used, the in-situ mechanical testing device monitors a plurality of mechanical parameters of the in-situ filling body and transmits the mechanical parameters to the data acquisition instrument, the data acquisition instrument establishes a mechanical information database after receiving the mechanical parameters, the cloud data analysis unit analyzes data in the mechanical information database in real time so as to monitor the evolution process of the internal mechanical property of the in-situ filling body, and when a certain parameter or a certain part of parameters exceed the limit, the cloud data analysis unit gives an alarm.
Compared with the prior art, the mine in-situ filling body mechanical evaluation system provided by the first aspect of the invention is suitable for analyzing and accurately evaluating the mechanical property of the in-situ filling body in real time in the full-time (filling stage, maintenance stage and bearing stage) process, has strong universality and integration of multi-parameter acquisition and processing, and can provide theoretical and technical support for the aspect of filling mining safety production.
Compared with the prior art, the mine in-situ filling body mechanical evaluation method provided by the second aspect of the invention can realize in-situ filling body in-situ mechanical property multi-parameter test, and the cloud data analysis unit can monitor the in-situ filling body mechanical state in real time and automatically alarm when the monitored parameters exceed the range, so that engineering personnel can accurately control the monitoring.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic block diagram of a mine in-situ filling body mechanics evaluation system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a vibrating wire stress sensor according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a tilt measuring instrument according to an embodiment of the present invention;
FIG. 4 is a schematic three-dimensional structure diagram of an in-situ mechanical testing apparatus according to an embodiment of the present invention;
fig. 5 is a schematic view of an installation structure of a mine in-situ filling body mechanics evaluation system provided by an embodiment of the invention;
fig. 6 is a block diagram of a mine in-situ filling body mechanical evaluation method according to an embodiment of the invention;
fig. 7 is a schematic diagram of an in-situ mechanical test arrangement of a test stope according to an embodiment of the present invention;
FIG. 8 is a graph of pore water pressure test data for a first point location provided by an embodiment of the present invention;
fig. 9 is a three-way stress test data graph of a first point location according to an embodiment of the present invention.
Icon: 1-an in-situ mechanical testing device; 11-a frame; 12-a vibrating wire stress sensor; 121-pressure-bearing round shell; 122-a stress induction module; 13-pore water pressure sensor; 14-a substrate suction sensor; 15-temperature-humidity-conductance integrated sensor; 16-a tilt meter; 161-tilt sensor; 2-a data acquisition instrument; 3-a cloud data analysis unit; 4-a database of mechanical information; 5-pillar mining; 6-a filling body; 7-filling the retaining wall; 8-first point location; 9-second point location; 10-third point location; 101-fourth point.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The embodiment of the first aspect of the invention provides a mine in-situ filling body mechanical evaluation system, as shown in fig. 1, which comprises an in-situ mechanical testing device 1, a data acquisition instrument 2 and a cloud data analysis unit 3, which are connected in sequence; the in-situ mechanical testing device 1 is used for acquiring multiple mechanical parameters of the in-situ filling body and transmitting the multiple mechanical parameters to the data acquisition instrument 2; the data acquisition instrument 2 is used for receiving a plurality of mechanical parameters and establishing a mechanical information database 4; the cloud data analysis unit 3 is used for analyzing and evaluating parameters in the mechanical information database 4 in real time and performing early warning.
The in-situ mechanical testing device 1 can monitor multiple mechanical parameters of the in-situ filling body simultaneously and transmit the multiple mechanical parameters to the data acquisition instrument 2, mechanical performance monitoring of the in-situ filling body is achieved, the data acquisition instrument 2 receives the multiple mechanical parameters and then establishes the mechanical information database 4, so that the cloud data analysis unit can analyze and evaluate data in the mechanical information database in real time, when a certain parameter or a certain part of parameters exceed the limit, the cloud data analysis unit can give an alarm, and theoretical and technical support is provided for the aspects of filling mining safety production.
In some embodiments, the in situ mechanical testing device 1 includes a frame 11 and a variety of sensors mounted on the frame 11.
The frame 11 provides a large installation space for each sensor, and various sensors can be installed at different positions of the frame 11 to monitor the mechanical properties of the in-situ filling body more comprehensively. In addition, according to different monitoring functions of different sensors, the sensors can be transversely, longitudinally and vertically arranged on the frame 11, and the monitoring result is more accurate.
Wherein the plurality of sensors includes at least two of a vibrating wire stress sensor 12, a pore water pressure sensor 13, a matrix suction sensor 14, a temperature-humidity-conductance integrated sensor 15, and a tilt meter 16.
Of course, the type of sensor is not limited to the above.
The function of each sensor is explained in detail below:
the vibrating wire stress sensor 12 can realize the interface stress transmission with the filling body and monitor the stress change in the in-situ filling body, and the measuring range of the vibrating wire stress sensor 12 is 0-4 MPa; the pore water pressure sensor 13 can test the pore water pressure of the in-situ filling body, and the measurement range of the pore water pressure sensor 13 is 0-4 MPa; the matrix suction sensor 14 can test the matrix suction of the in-situ filling body, and the measurement range of the matrix suction sensor 14 is 0-2.5 MPa; the temperature-humidity-conductivity integrated sensor 15 can simultaneously test three parameters of the temperature, the humidity and the conductivity of the in-situ filler, the temperature measurement range of the temperature-humidity-conductivity integrated sensor 15 is-25 to +65 ℃, the water content measurement range is 0 to 100 percent, and the conductivity measurement range is 0 to 2.3S/m; the inclination measuring instrument 16 can test the inclination angle of the in-situ mechanical testing device, and the measurement range of the inclination measuring instrument 16 is-15 degrees to +15 degrees. The sensor can fully monitor the change condition of the mechanical property inside the in-situ filling body and collect the mechanical property parameters of the in-situ filling body.
Specifically, as shown in fig. 2, the vibrating wire stress sensor 12 includes a pressure-bearing circular shell 121, a stress sensing module 122, and a temperature compensation module located in the stress sensing module 122, where the stress sensing module 122 is connected to the pressure-bearing circular shell 121. The pressure-bearing circular shell 121 is of a stress structure, deformation of the pressure-bearing circular shell 121 is transmitted to the stress sensing module 122 in the form of an electric signal, and stress parameters corresponding to deformation of the pressure-bearing circular shell 121 are transmitted to the data acquisition instrument 2 in the form of the electric signal by the stress sensing module 122. In addition, a temperature compensation module is arranged inside the stress sensing module 122, and the temperature compensation module can improve the precision of stress test data and ensure the accuracy of the obtained stress parameters.
As shown in fig. 3, the inclination measuring device 16 includes an inclination sensor 161, and the inclination sensor 161 is connected to the data acquisition device 2 through a cable.
In at least one embodiment, as shown in FIG. 4, the outer surface of the frame 11 is in a cubic configuration. The sensors may be on various surfaces of the frame 11 without interfering with each other when the sensors are mounted.
Specifically, the frame 11 is a metal frame having a side length of 30cm to 60 cm.
Of course, the outer surface of the frame 11 may have a rectangular parallelepiped structure or other shape structure.
In at least one embodiment, the vibrating wire stress sensors 12 are configured in three, the three vibrating wire stress sensors 12 are respectively installed on different surfaces of the frame 11, and the surfaces on which the three vibrating wire stress sensors 12 are installed are orthogonal; the pore water pressure sensor 13 is arranged on the side surface of the frame 11, and the pore water pressure sensor 13 is vertically arranged; the inclination measuring instrument 16 is mounted at the bottom of the frame 11; the substrate suction sensor 14 and the temperature-humidity-conductivity integrated sensor 15 are both mounted on the side of the tilt meter 16.
The three vibrating wire stress sensors 12 respectively monitor stress parameters of the in-situ filling body in three directions, namely the transverse direction, the vertical direction and the longitudinal direction, are assembled into a three-way stress sensor, and comprehensively monitor the stress condition of the surface of the in-situ filling body; the pore water pressure sensor 13 can be specifically arranged on an upright post on the side surface of the frame 11 to obtain the pore water pressure of the in-situ filling body; the inclination measuring instrument 16 is arranged at the bottom of the frame 11, so that the position of the inclination measuring instrument 16 relative to the frame 11 can be ensured to be stable; the substrate suction sensor 14 and the temperature-humidity-conductivity integrated sensor 15 are both arranged on the side of the inclination measuring instrument 16, so that the normal monitoring of the performance parameters of the in-situ filling body by the substrate suction sensor and the temperature-humidity-conductivity integrated sensor can be ensured, and meanwhile, the framework 11 plays a role in protecting the substrate suction sensor and the temperature-humidity-conductivity integrated sensor.
Specifically, as shown in fig. 4, the frame 11 includes a top surface, a bottom surface and four side surfaces, three vibrating wire stress sensors 12 are respectively disposed on the top surface and two adjacent side surfaces of the frame 11, the pore water pressure sensor 13 is disposed on one of the remaining two side surfaces of the frame 11, and the tilt meter 16, the substrate suction sensor 14 and the integrated temperature-humidity-conductivity sensor 15 are disposed in the frame 11 and mounted on the bottom surface of the frame 11.
In some embodiments, as shown in fig. 5, the in-situ mechanical testing device 1 is configured to be a plurality of devices, the pillars 5 are arranged on two sides of the filling body 6, the plurality of in-situ mechanical testing devices 1 are connected with one end of a multi-core cable through a connection terminal, and the other end of the multi-core cable is connected with the data acquisition instrument 2.
It should be noted that the length of the multi-core cable should meet the design requirement, and the mark is made near the end of the multi-core cable for easy identification.
An embodiment of the second aspect of the present invention is directed to a mine in-situ filling body mechanical evaluation method, where the mine in-situ filling body mechanical evaluation method provided by the embodiment of the second aspect of the present invention employs the above-described mine in-situ filling body mechanical evaluation system, and includes:
the in-situ mechanical testing device 1 is placed in a preset position of a goaf to be filled in advance;
in the full time sequence process of the underground in-situ filling body, the in-situ mechanical testing device 1 acquires a plurality of mechanical parameters of the in-situ filling body and transmits the mechanical parameters to the data acquisition instrument 2;
the data acquisition instrument 2 establishes a mechanical information database 4;
the cloud data analysis unit 3 analyzes and evaluates various mechanical parameters in the mechanical information database 4 in real time, monitors the mechanical state of the in-situ filling body according to a preset stress early warning value, and automatically alarms once the mechanical parameters monitored in real time reach an early warning condition.
Compared with the prior art, the mine in-situ filling body mechanical evaluation method provided by the embodiment of the second aspect of the invention can realize multi-parameter testing of in-situ mechanical property of the in-situ filling body, and the cloud data analysis unit 3 can monitor the mechanical state of the in-situ filling body in real time, and automatically alarm when the monitoring parameter exceeds the range, so that accurate management and control of engineering personnel are facilitated.
Before the underground goaf begins to be installed, whether the performances of the in-situ mechanical testing device 1 and the data acquisition instrument 2 work normally needs to be checked.
Specifically, the in-situ mechanical testing device 1 can be adjusted to a preset position through a fixed pulley fixed on a top plate of the goaf, the data acquisition instrument 2 is arranged on the outer side of the filling retaining wall 7, and a storage battery power supply or 220V alternating current power supply is selected according to the field working condition.
In addition, the cables of the in-situ mechanical testing device 1 are laid with margins, mutual winding is forbidden when the cables are gathered together, the cables are led out of the outer side of the filling retaining wall 7 and then connected with the data acquisition instrument 2, and the surplus cables are rolled up and hung on the reinforcing steel bars near the data acquisition instrument 2, so that the cables are prevented from being damaged by rolling equipment.
Specifically, as shown in fig. 6, the full time sequence includes a filling phase, a curing phase and a loading phase;
in the filling stage and the maintenance stage, the cloud data analysis unit 3 establishes a collaborative characterization method of four indexes of matrix suction, temperature, water content and conductivity, and evaluates the internal mechanical property of the in-situ filling body;
in the bearing stage, the cloud data analysis unit 3 establishes a collaborative characterization method of three-dimensional stress-pore water pressure two indexes, and evaluates the internal mechanical property of the in-situ filling body.
Specifically, monitoring of four indexes of substrate suction, temperature, water content and electric conductivity is realized through a substrate suction sensor 14 and a temperature-humidity-electric conductivity integrated sensor 15; three vibrating wire stress sensors 12 and a pore water pressure sensor 13 are used for monitoring two indexes of three-dimensional stress-pore water pressure.
The above collaborative characterization method may specifically include constructing a stress line graph in a rectangular coordinate system.
In some embodiments, the pre-set pre-stress warning values include: pouring the filling slurry into a cube test mold, removing the mold, then placing the cube test mold into a standard curing box for curing, wherein the curing conditions are the actual temperature and humidity of an underground stope, and after the test piece is cured, performing mechanical strength test to obtain the uniaxial compressive strength value of the full stress-strain curve of the filling body, namely the stress early warning value of the in-situ filling body.
Wherein, the side length of the cube test mold is 7.07cm, and the cube test mold can also float around 7.07 cm.
And in addition, after the mold is removed, the die is placed into a standard curing box for curing for 28 days, and after the curing is finished, an electro-hydraulic servo press machine is used for carrying out mechanical strength testing.
The following is detailed by specific embodiments:
the scale of iron ore production in a certain place is 750 ten thousand t/a. At present, a two-step sublevel open stoping subsequent filling mining method is adopted in the ground, the sublevel height is 100m, the sublevel height is 25m, the length is the horizontal thickness of an ore body, the average thickness is 50m, no stud is left between stopes, and the volume of a single stope dead zone reaches 10-16 ten thousand m 3. In the early stage of a mine, for safe extraction, the filling proportioning parameters of the whole stope are high, the filling cost is increased, and meanwhile, in the actual production process, the phenomena of caving and caving exist in the local part of the in-situ filling body, so that the mine urgently needs to test the internal stress distribution state of the in-situ filling body, and then the filling proportioning parameters of the stope are accurately designed.
1) According to the distribution form of the mine underground test stope, respectively arranging an in-situ mechanical test point position on 4 subsection levels of the test stope;
2) aiming at the mechanical property test requirement of the underground in-situ filling body, the in-situ mechanical test device 1 comprises a cubic metal frame, a vibrating wire stress sensor 12, a pore water pressure sensor 13, an inclination measuring instrument 16 and other modules;
3) as shown in fig. 7, the data acquisition instrument 2 can simultaneously read test data signals of 10 channels, that is, test data of two test points is satisfied, so that cables of the in-situ mechanical test device 1 at the first point location 8 and the second point location 9 are both pulled out from the filling retaining wall at the second point location 9, and cables of the test device at the third point location 10 and the fourth point location 101 are both pulled out from the filling retaining wall at the fourth point location 101.
4) And as no optical fiber is laid in the mine underground test stope, after the in-situ mechanical testing device 1 is installed, the two data acquisition instruments 2 need to be periodically subjected to data acquisition, and the acquired data is timely transmitted to the notebook computer through the USB interface.
5) The concentration of the filling slurry of the test stope is 70%, the ratio of ash to sand is 1:10, and the strength of the cemented filling body in the 28d curing period is 3.33 MPa. Therefore, the stress early warning values of 4 test point locations in the cloud data analysis unit 3 are 3.33MPa, and meanwhile, collected data are processed, as shown in fig. 8 and 9, so that the pore water pressure and three-way stress changes in the 4 test point locations are obtained.
6) Referring to fig. 8 to 9, in the full time sequence test process, the peak value of the pore water pressure is 0.15MPa, the vertical stress in the three-dimensional stress is higher than the horizontal stress, and the vertical stress is 1.82MPa, so that the required strength of the underground in-situ filling body is accurately determined, and the adjustment of the filling proportioning parameters of the stope can be scientifically guided.
In summary, the mine in-situ filling body mechanical evaluation system and method provided by the invention have the following advantages:
1. the in-situ mechanical evaluation system can evaluate the evolution process of the mechanical property of the in-situ filling body in real time in the full-time (filling stage, maintenance stage and bearing stage) process, integrates data acquisition and processing, has a stress early warning function, and is convenient for engineering personnel to accurately control.
2. The in-situ mechanical testing device 1 is assembled in a modularized mode, is rapid to install and high in universality, and can realize multi-parameter testing of in-situ mechanical properties of the in-situ filling body.
3. Aiming at underground filling materials and environmental characteristics, the vibrating wire stress sensor 12 is adopted, so that the interface stress transmission with a filling body can be realized, a temperature compensation module is added, and the precision of stress test data is improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A mine in-situ filling body mechanical evaluation system is characterized by comprising an in-situ mechanical testing device (1), a data acquisition instrument (2) and a cloud data analysis unit (3) which are sequentially connected;
the in-situ mechanical testing device (1) is used for acquiring a plurality of mechanical parameters of an in-situ filling body and transmitting the mechanical parameters to the data acquisition instrument (2);
the data acquisition instrument (2) is used for receiving a plurality of mechanical parameters and establishing a mechanical information database (4);
the cloud data analysis unit (3) is used for analyzing and evaluating parameters in the mechanical information database (4) in real time and giving an early warning.
2. The mine in-situ filling body mechanical evaluation system according to claim 1, wherein the in-situ mechanical testing device (1) comprises a frame (11) and a plurality of sensors mounted on the frame (11).
3. The mine in-situ pack dynamics evaluation system of claim 2, wherein the plurality of sensors includes at least two of a vibrating wire stress sensor (12), a pore water pressure sensor (13), a matrix suction sensor (14), a temperature-humidity-conductance integrated sensor (15), and a tilt meter (16).
4. The mine in-situ filling body mechanical evaluation system according to claim 3, wherein the vibrating wire stress sensor (12) comprises a pressure-bearing circular shell (121), a stress induction module (122) and a temperature compensation module located in the stress induction module (122), and the stress induction module (122) is connected with the pressure-bearing circular shell (121).
5. The mine in-situ filling body mechanical evaluation system according to claim 3, wherein the outer surface of the frame (11) is in a cubic structure.
6. The mine in-situ filling body mechanics evaluation system according to claim 5, wherein the vibrating wire stress sensors (12) are configured in three, three vibrating wire stress sensors (12) are respectively installed on different surfaces of the frame (11), and the surfaces on which the three vibrating wire stress sensors (12) are installed are orthogonal;
the pore water pressure sensor (13) is arranged on the side surface of the frame (11), and the pore water pressure sensor (13) is vertically arranged;
the inclination measuring instrument (16) is arranged at the bottom of the frame (11);
the substrate suction sensor (14) and the temperature-humidity-conductivity integrated sensor (15) are both mounted on the side of the inclination measuring instrument (16).
7. The mine in-situ filling body mechanical evaluation system according to claim 1, wherein the in-situ mechanical testing devices (1) are configured in a plurality, the in-situ mechanical testing devices (1) are connected with one end of a multi-core cable through a wiring terminal, and the other end of the multi-core cable is connected with the data acquisition instrument (2).
8. A mine in-situ filling body mechanical evaluation method using the mine in-situ filling body mechanical evaluation system according to any one of claims 1 to 7, comprising:
the in-situ mechanical testing device (1) is placed in a preset position of a goaf to be filled in advance;
in the full-time process of the underground in-situ filling body, the in-situ mechanical testing device (1) acquires a plurality of mechanical parameters of the in-situ filling body and transmits the mechanical parameters to the data acquisition instrument (2);
the data acquisition instrument (2) establishes a mechanical information database (4);
the cloud data analysis unit (3) analyzes and evaluates each mechanical parameter in the mechanical information database (4) in real time, monitors the mechanical state of the in-situ filling body according to a preset stress early warning value, and automatically alarms once the mechanical parameters monitored in real time reach an early warning condition.
9. The mine in-situ filling body mechanical evaluation method according to claim 8, wherein the full time sequence comprises a filling stage, a maintenance stage and a bearing stage;
in the filling stage and the maintenance stage, the cloud data analysis unit (3) establishes a collaborative characterization method of four indexes of matrix suction, temperature, water content and conductivity, and evaluates the internal mechanical property of the in-situ filling body;
in the bearing stage, the cloud data analysis unit (3) establishes a three-dimensional stress-pore water pressure two-index collaborative characterization method, and evaluates the internal mechanical property of the in-situ filling body.
10. The mine in-situ filling body mechanics evaluation method according to claim 8, wherein presetting the stress early warning value comprises:
pouring the filling slurry into a cube test mold, removing the mold, then placing the cube test mold into a standard curing box for curing, wherein the curing conditions are the actual temperature and humidity of an underground stope, and after the test piece is cured, performing mechanical strength test to obtain the uniaxial compressive strength value of the full stress-strain curve of the filling body, namely the stress early warning value of the in-situ filling body.
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| CN113359653A (en) * | 2021-07-15 | 2021-09-07 | 山东黄金矿业科技有限公司充填工程实验室分公司 | Smart filling control system based on cloud platform big data fusion |
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| WO2023185025A1 (en) * | 2022-04-01 | 2023-10-05 | 广东电网有限责任公司东莞供电局 | Cabling stress analysis method and apparatus |
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