CN112903465B - Device and method for testing double bearing capacity of single-row group columns in inclined goaf - Google Patents
Device and method for testing double bearing capacity of single-row group columns in inclined goaf Download PDFInfo
- Publication number
- CN112903465B CN112903465B CN202110151088.7A CN202110151088A CN112903465B CN 112903465 B CN112903465 B CN 112903465B CN 202110151088 A CN202110151088 A CN 202110151088A CN 112903465 B CN112903465 B CN 112903465B
- Authority
- CN
- China
- Prior art keywords
- clamping seat
- column
- sliding clamping
- fixing
- pressure plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0254—Biaxial, the forces being applied along two normal axes of the specimen
Abstract
The invention discloses a device and a method for testing double bearing capacity of single-row group columns in an inclined goaf. The device is characterized in that four protection rings are arranged on a base, a rack is arranged in each protection ring, one end of each rack is connected with the base, the other end of each rack is connected with a cross frame, and five positioning grooves are formed in a pressing disc, so that variable-angle double-shaft synchronous compression of 1-5 test pieces can be realized. The invention can realize the synchronous loading of a plurality of coal, rock, filling bodies, concrete, coal-filling and rock-filling test pieces, can obtain the integral bearing capacity of the single-row group column system of the inclined goaf under the condition of double-shaft loading, obtains the mutual influence relationship among the group columns of the inclined goaf, lays a foundation for revealing the chain instability response characteristics and mechanism of the single-row group column of the inclined goaf under the condition of double-shaft compression, and provides guidance for the research on the chain instability prevention and control technology of the single-row group column of the inclined goaf.
Description
Technical Field
The invention relates to a device and a method for testing double bearing capacity of a single-row group column in an inclined goaf, which are mainly suitable for a device and a method for synchronously loading a plurality of coal, rock, filling bodies, concrete, coal-filling and rock-filling test pieces and belong to the technical field of mining rock mechanical tests.
Background
Due to the laggard mining method in the old mining period, a large amount of left-over coal pillars are formed in a plurality of mines in China, and the left-over coal pillars mainly comprise the following steps: the coal pillar group is formed by combining a cutter pillar type, a room pillar type, a strip type, a short-wall type, a roadway mining type, a warehouse type and a jump mining type. Similarly, pillar clusters are also formed in the goaf during metal mining to carry overburden loads and to ensure long term stability of the stope.
The filling mining can effectively control the overlying strata movement and the surface subsidence. In recent years, in order to solve the technical problems of insufficient sources of filling materials, high cost and the like, the technical methods of partial filling, roadside filling, strip filling, pier column filling, local filling, short wall filling, strip filling, interval filling, pillar filling, structural filling, functional filling, framework filling and the like are applied and popularized in a plurality of mines. The filling mining technical method is difficult to avoid that filling columns (concrete columns) with different sizes/shapes are reserved in the goaf and are distributed in a group column mode to form a filling body group column or a concrete group column in a combined mode.
The above coal pillar group, ore pillar group, packed pillar group, and concrete group are collectively referred to herein as "pillar group". The initial purpose of reserving stope group columns is to bear the load of an overlying strata and ensure the long-term stability of a goaf. The long-term stability of stope bollards is a scientific issue of concern. However, under the coupling action of overburden load, disturbance load, mine water erosion, sulfate corrosion, chloride corrosion, natural weathering and the like, the bearing capacity of the stope group column is gradually weakened, instability of a group column system can be caused, so that disasters such as overburden collapse, surface subsidence and the like are caused, and great potential safety hazards are brought to safe and efficient mining of coal resources.
The independent individuals of the stope group columns have mutual influence, and overlying strata load, disturbance load and the like are not borne by a single stope column body and are mainly borne together through a group column system. If one column body is locally destabilized and damaged, overlying strata loads and disturbance loads are transferred, so that adjacent group columns are destabilized and damaged, and chain instability of 'domino' of stope group columns is caused. Therefore, it is highly necessary to test the overall load bearing capacity of the stope group column system. At present, the overall bearing capacity of a group column in a field monitoring stope is difficult to realize, and the test can be only carried out by depending on a small-size group column test piece in a laboratory. The traditional testing machine can only load a single column test piece, and can not load a group of column test pieces. In actual engineering, coal seams usually have a certain inclination angle and are not horizontally distributed, so that the research on the bearing capacity of a group column system under a variable angle is necessary, but the traditional testing machine cannot research the double bearing capacity of the group column system under the variable angle.
In summary, it is urgently needed to develop a testing device and method for the whole bearing capacity of the stope group column, so as to obtain the whole bearing capacity of the stope group column system, obtain the mutual influence relation between the group column individuals, lay a foundation for revealing the chain instability response characteristics and mechanism of the stope group column, and provide guidance for the development of the stope group column chain instability prevention and control technology. The invention provides a single-row grouped column for a focusing inclined goaf, and aims to provide a device and a method for testing double-bearing capacity of the single-row grouped column for the inclined goaf.
Disclosure of Invention
The invention aims to provide a device and a method for testing double bearing capacity of a single-row group column in an inclined goaf, in particular to a device for synchronously loading a plurality of coal, rock, filling bodies, concrete, coal-filling and rock-filling test pieces, which can obtain the mutual influence relation among group column individuals, lay a foundation for disclosing the chain instability response characteristics and mechanism of a stope group column and provide guidance for developing a stope group column chain instability prevention and control technology.
The invention provides a single-row group-column double-bearing-capacity testing device for an inclined goaf, which comprises a testing machine base, a rack, a lower pressing disc, an upper sliding clamping seat, a lower sliding clamping seat, a cross frame, a vertical force control device, a baffle, a protection ring, a pushing shaft shell, a fixing ring, a fixing groove, a scale mark, a fixing bolt, an arc-shaped clamping block, a fixing rolling shaft, an arc-shaped groove, a positioning groove, a transverse force control device, a transverse pressing plate, a side pressing disc, a side sliding clamping seat, a telescopic upright column, a pulley, a sliding rail and a fixing block, wherein the fixing bolt, the arc-shaped clamping block, the fixing rolling shaft, the arc-shaped groove, the positioning groove, the transverse force control device, the transverse pressing plate, the side pressing disc, the side sliding clamping seat, the telescopic upright column, the pulley, the sliding rail and the fixing block are arranged on the rack;
The bottom of the frame is connected with the base of the testing machine, and the top of the frame is connected with the transverse frame; the upper sliding clamping seat and the lower sliding clamping seat are respectively semi-cylindrical blocks, five positioning grooves positioned on the same central line are arranged on the lower sliding clamping seat, and the positioning grooves are separated by a baffle plate, so that the bearing capacity of 1-5 test pieces can be tested simultaneously; the upper part of the upper sliding clamping seat is connected with the upper pressure plate, and the lower sliding clamping seat is connected with the lower pressure plate; the outer sides of the upper sliding clamping seat and the lower sliding clamping seat are provided with fixing rings which are used for connecting the upper sliding clamping seat and the lower sliding clamping seat; the outer side of the fixing ring is provided with an arc-shaped fixture block, and the fixing block is fixedly connected with the fixing blocks of the upper pressure plate and the lower pressure plate through the arc-shaped fixture block;
the transverse force control device is fixed on the side sliding clamping seat, the lower part of the side sliding clamping seat is connected with the side pressure plate, slide rails are arranged on two sides of the base, and the side pressure plate is connected with the base in a sliding mode through a telescopic upright post;
the vertical force control device comprises a vertical hydraulic pushing shaft, a hydraulic oil cylinder and a pressure sensor; the vertical force control device acts on the upper pressure plate through a hydraulic pushing shaft; the transverse force control device comprises a transverse hydraulic pushing shaft, a hydraulic oil cylinder and a pressure sensor; the transverse hydraulic pushing shaft is controlled and adjusted by a hydraulic oil cylinder, acts on a test piece through a transverse pressing plate, realizes the loading with the same or different speeds on different test pieces, and is used for simulating the conditions of uniform stress and non-uniform stress of the test piece;
The upper sliding clamping seat, the lower sliding clamping seat and the side sliding clamping seat are respectively provided with scale marks, so that the rotating angle can be accurately regulated and controlled.
In the device, the goaf is formed after the coal seam with an inclination angle of-50 degrees to 50 degrees is mined; the group column comprises one of a coal column group, an ore column group, a filling column group, a concrete column group, a coal column-filling column combined group column, an ore column-filling column combined group column and a coal column-concrete column combined group column; the section of the group column is circular or rectangular or triangular or trapezoidal.
In the device, five fixing grooves are formed in the lower pressing disc and used for placing the baffle plate, so that the test piece cannot slide off in the rotation process of the device; five positioning grooves (positioned between the baffles) are arranged on the lower pressure plate and used for placing a test piece, the shapes of the positioning grooves correspond to the shape of the test piece, and the central point of each positioning groove is positioned on the same straight line; the central points of the transverse press plates are positioned on the same straight line. The side pressure disk is installed on the slide rail through flexible stand and pulley, and the slide rail is fixed on the base, the side pressure disk is according to actual demand through flexible stand height-adjusting, through slide rail adjusting position.
In the device, the fixing rings are respectively arranged between the upper pressure plate and the upper sliding clamping seat and between the lower pressure plate and the lower sliding clamping seat, and the middle part of the fixing ring is provided with a fixing bolt for respectively connecting the upper sliding clamping seat and the lower sliding clamping seat with the fixing rings; go up the pressure disk, it is fixed to connect through the arc fixture block between pressure disk and the solid fixed ring down, the arc fixture block is the looks isostructure between last pressure disk and the solid fixed ring down, the preceding of arc fixture block, the rear end respectively is equipped with a fixed roller bearing, bottom at last pressure disk, the top of pressure disk sets up the fixed block respectively down, be equipped with a hollow arc wall in inside in the fixed block, its hollow position is used for placing the arc fixture block, the last bottom surface and the lower bottom surface of arc wall are the recess profile respectively, wherein the central angle that every little recess corresponds is 2, fixed roller bearing is located between the last bottom surface and the lower bottom surface of arc wall, cooperate with the arc wall through rotatory fixed roller bearing, regulation and control device rotation angle, the inclination in simulation slope collecting space area.
In the device, the length, the width and the height of the baffle are respectively 300mm, 5mm and 90 mm; the length and the width of the upper sliding clamping seat and the lower sliding clamping seat are respectively 1000mm and 400 mm.
In the device, five groups of force control devices and ten groups of force control devices are respectively arranged in the vertical direction and the horizontal direction, each group of force control devices is provided with a pressure sensor, and the pressure sensors are connected with a microcomputer through a control circuit and can respectively and accurately display the stress state of each test piece.
Preferably, the device can test the double bearing capacity of the horizontal group column system and can also test the double bearing capacity of the group column system under variable angles; the double-shaft bearing capacity of a single coal, rock, filling body, concrete, coal-filling and rock-filling test piece can be researched, and the double-shaft bearing capacity of a group column system of a plurality of coal, rock, filling body, concrete, coal-filling and rock-filling test pieces can also be researched.
The invention provides a method for testing double bearing capacity of a single-row legacy group column in an inclined goaf, which comprises the following steps:
the method comprises the following steps: the distribution position, the form and the size of the remaining grouped pillars in the horizontal goaf in the range to be tested are comprehensively investigated by utilizing the original geological technical data of the mine and by means of a supplementary exploration technical means;
Step two: determining the size and the number of test pieces for testing based on the information of the horizontal goaf remaining grouped columns obtained in the step one;
step three: drilling a test piece with a proper size by using a special core drilling machine for coal rock and a multi-speed manual feeding mode, cutting and polishing the test piece to the shape and size required by a test by using a coal rock cutting machine, wherein the diameter of the cylindrical test piece is not more than 150mm, and the length and the width of the square test piece are not more than 150 mm;
step four: sequentially installing the test piece in a positioning groove (21) on a lower pressure plate (6); a baffle (11) is placed in the fixing groove; rotating the device to a target angle;
step five: clearing the force value of each sensor (10) to zero, and preloading;
step six: removing the baffle (11) after the preloading is finished;
step seven: setting the magnitude of the transverse applied load and loading the load to a target value through a transverse hydraulic pushing shaft (22);
step eight: after the transverse loading is finished, the loading speed of the hydraulic pushing shaft (8) is set for loading;
step nine: after loading is finished, the device is restored to be horizontal, the axial hydraulic pump (9) is used for controlling hydraulic pressure to push the shaft (8) to unload, and the test is finished.
The invention has the beneficial effects that:
The invention can realize the simultaneous loading of a plurality of coal, rock, filling body, concrete, coal-filling and rock-filling test pieces under the condition of changing the angle, further realize the simulation of the loading damage of a plurality of body ore pillars, continuously change the loaded angle of the test piece and research the double-bearing capacity of a group column system under different angles.
Drawings
FIG. 1 is a sloped gob carry-over cluster column distribution plot;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a schematic view of the present invention operating at a horizontal angle;
FIG. 4 is a schematic view of the present invention in a tilted working position;
FIG. 5 is a schematic view of the present invention in combination with a loading mechanism;
FIG. 6 is a schematic view of a retaining ring according to the present invention;
FIG. 7 is a schematic view of the internal structure of the upper platen according to the present invention;
FIG. 8 is a view showing the connection between the upper fixing block and the arc-shaped groove and the fixing roller according to the present invention;
FIG. 9 is a schematic view of an upper fixing block and an arc-shaped groove engaging fixing roller according to the present invention;
FIG. 10 is a schematic diagram of the scale on the upper sliding seat according to the present invention;
FIG. 11 is a schematic view of the lateral loading configuration of the present invention;
FIG. 12 is a schematic view of the vertical force control device of the present invention;
FIG. 13 is a schematic view of a lateral force control apparatus of the present invention.
In the figure: 1-tester base; 2, a frame; 3, pressing a plate downwards; 4, an upper pressure plate; 5, sliding the clamping seat upwards; 6-lower sliding card seat; 7-horizontal frame; 8, pushing a shaft hydraulically; 9-a hydraulic pump; 10-a pressure sensor; 11-a baffle; 12-a guard ring; 13-pushing the shaft housing; 14-a fixed ring; 15-test piece; 16-scale mark; 17-fixing the bolt; 18-arc fixture block; 19-fixed rollers; 20-arc groove; 21-a positioning groove; 22-transverse hydraulic pushing shaft; 23-a transverse platen; 24-side platen; 25-side sliding clamping seat; 26-a telescopic upright post; 27-a pulley; 28-a slide rail; 29-fixed block.
Detailed Description
The present invention is further illustrated by, but is not limited to, the following examples.
Example 1:
as shown in fig. 1 to 13, a device for testing dual bearing capacity of single-row group column in an inclined goaf includes: the device comprises a testing machine base 1, a frame 2, a lower pressing disc 3, an upper pressing disc 4, an upper sliding clamping seat 5, a lower sliding clamping seat 6, a cross frame 7, a hydraulic pushing shaft 8, a hydraulic pump 9, a pressure sensor 10, a baffle 11, a protection ring 12, a pushing shaft shell 13, a fixing ring 14, a fixing groove, scale marks 16, a fixing bolt 17, an arc-shaped clamping block 18, a fixing rolling shaft 19, an arc-shaped groove 20, a positioning groove 21, a transverse hydraulic pushing shaft 22, a transverse pressing plate 23, a side pressing disc 24, a side sliding clamping seat 25, a telescopic upright post 26, a pulley 27, a sliding rail 28 and a fixing block 29;
four protection rings 12 are arranged on the base 1, a rack 2 is arranged in each protection ring 12, one end of each rack 2 is connected with the base 1, the other end of each rack 2 is connected with the cross frame 7, five test piece positioning grooves 21 which are positioned on the same central line are arranged on the lower sliding clamping seat 6, and the positioning grooves are separated by a baffle plate 11 and can simultaneously test the bearing capacity of 1-5 test pieces; the upper part of the upper sliding clamping seat 5 is connected with the upper pressure plate 4, and the lower sliding clamping seat 6 is connected with the lower pressure plate 3; as shown in fig. 2.
The transverse force control device is fixed on the side sliding clamping seat, the lower part of the side sliding clamping seat is connected with the side pressure plate, slide rails are arranged on two sides of the base, and the side pressure plate is connected with the base in a sliding mode through a telescopic upright post;
the vertical force control device comprises a vertical hydraulic pushing shaft, a hydraulic oil cylinder and a pressure sensor; the vertical force control device acts on the upper pressure plate through a hydraulic pushing shaft; the transverse force control device comprises a transverse hydraulic pushing shaft, a hydraulic oil cylinder and a pressure sensor; the transverse hydraulic pushing shaft is controlled and adjusted by a hydraulic oil cylinder, acts on a test piece through a transverse pressing plate, realizes the loading with the same or different speeds on different test pieces, and is used for simulating the conditions of uniform stress and non-uniform stress of the test piece;
the upper sliding clamping seat, the lower sliding clamping seat and the side sliding clamping seat are respectively provided with scale marks, so that the rotating angle can be accurately regulated and controlled.
Preferably, the apparatus and method are suitable for use in a group column system having an inclination angle of-50 ° to 50 °.
Preferably, the device and the method are not only suitable for the left coal pillar with a circular section, but also suitable for the left coal pillar with a rectangular section, and more suitable for the left coal pillar with a triangular section.
Preferably, five positioning grooves 21 are arranged on the lower platen 3 for placing a test piece, the center point of each positioning groove is located on the same straight line, and the shape of the positioning groove corresponds to the shape of the test piece, as shown in fig. 3.
Preferably, five fixing grooves are formed on the lower pressing plate 3 for placing the baffle 11, so as to ensure that the test piece does not slide off during the rotation of the device, as shown in fig. 2.
Preferably, the length, width and height of the baffle 11 are 300mm, 5mm and 90mm respectively; the length and width of the upper sliding clamping seat 5 and the lower sliding clamping seat 6 are 1000mm and 400mm respectively.
Preferably, the apparatus: five and ten pressure sensors 10 are respectively arranged in the hydraulic system in the vertical direction and the horizontal direction, and the pressure sensors 10 are connected with a microcomputer through a control circuit, so that the stress state of each test piece can be respectively and accurately displayed.
Preferably, the scale marks 16 are arranged on the upper sliding clamping seat 5, the lower sliding clamping seat 6 and the side sliding clamping seat 25, so that the inclination angle can be accurately regulated and controlled, as shown in fig. 2.
Preferably, the upper pressure plate 3, the lower pressure plate 4 and the fixing ring 14 are connected and fixed through arc-shaped fixture blocks 18, and the fixing ring 14 is connected with the upper sliding clamp 5 and the lower sliding clamp 6 through fixing bolts 17, as shown in fig. 5.
In the device, the outer sides of the upper, lower and side sliding clamping seats are provided with fixing rings for connecting the pressure plate and the sliding clamping seat; the outer side of the fixing ring is provided with an arc-shaped fixture block, and the fixing block is fixedly connected with the fixing blocks of the upper, lower and side pressure plates through the arc-shaped fixture block;
The fixing rings 14 are respectively arranged between the upper pressing disc and the upper sliding clamping seat, between the lower pressing disc and the lower sliding clamping seat and between the side pressing disc and the side sliding clamping seat, fixing bolts are arranged in the middle of the fixing rings, and the upper, lower and side sliding clamping seats are respectively connected with the fixing rings; go up the pressure disk, down the pressure disk, it is fixed to connect through arc fixture block 18 between side pressure disk and the solid fixed ring, adapting unit is between last pressure disk and the solid fixed ring, between pressure disk and the solid fixed ring down, be the same structure between side pressure disk and the solid fixed ring, the front and back end of arc fixture block respectively is equipped with a fixed roller 19, set up the fixed block respectively in the bottom of last pressure disk, the top of pressure disk down, be equipped with a hollow arc wall 20 in the fixed block, its hollow position is used for placing arc fixture block 18, the last bottom surface and the lower bottom surface of arc wall are the concave groove profile respectively, wherein the central angle that every little recess corresponds is 2, fixed roller 19 is located between bottom surface and the lower bottom surface on arc wall 20, through rotatory fixed roller and the cooperation of arc wall, regulation and control device rotation angle, the inclination in simulation slope collecting space area. The fixing block engages with the arc-shaped groove to fix the roller 19, so as to fix the device after rotation, as shown in fig. 8 and 9.
Preferably, each transverse pressing plate 23 is connected with one transverse hydraulic pushing shaft 22, so that loading with the same or different speed can be carried out on different test pieces, and the conditions of uniform transverse pressure and non-uniform transverse pressure of the test piece can be simulated, as shown in fig. 3.
Preferably, the side platen 24 is mounted on a slide rail 28 through a telescopic column 26 and a pulley 27, the slide rail 28 is fixed on the base 1, and the side platen 24 can be adjusted in height through the telescopic column 26 and adjusted in position through the slide rail 28 according to actual requirements, as shown in fig. 11.
Preferably, the device can test the double bearing capacity of the horizontal angle group column system and can also test the double bearing capacity of the group column system under variable angles; the double-bearing capacity of a single coal, rock and filling body test piece can be researched, and the double-bearing capacity of a plurality of coal, rock and filling body group column systems can also be researched.
Preferably, the device operating step comprises:
the method comprises the following steps: the distribution position, the form and the size of the remaining grouped pillars in the horizontal goaf in the range to be tested are comprehensively investigated by utilizing the original geological technical data of the mine and by means of a supplementary exploration technical means;
step two: determining the size and the number of test pieces for testing based on the information of the horizontal goaf remaining grouped columns obtained in the step one;
Step three: drilling a test piece with a proper size by using a special core drilling machine for coal rock and in a multi-stage variable speed manual feeding mode, and cutting the test piece into cuboids with the length, width and height of 100mm, 100mm and 200mm by using a coal rock cutting machine;
step four: sequentially installing the test piece in a positioning groove 21 on the lower pressure plate 6; a baffle plate 11 is placed in the fixing groove; rotating the device to a target angle;
step five: clearing the force value of each sensor 10, and preloading;
step six: removing the baffle 11 after the preloading is finished;
step seven: setting the magnitude of the lateral applied load and loading to a target value by the lateral hydraulic pushing shaft 22;
step eight: after the transverse loading is finished, setting the loading speed of the hydraulic pushing shaft 8 for loading;
step nine: after loading is finished, the device is restored to be horizontal, the axial hydraulic pump 9 is used for controlling hydraulic pressure to push the shaft 8 to unload, and the test is finished.
The above is an embodiment of the present invention, and it should be noted that the present invention is not limited to the above embodiment, and may be simply modified according to the substance of the present invention, which all fall within the technical scope of the present invention.
Claims (8)
1. The utility model provides a double bearing capacity testing arrangement of single row of crowd's post in slope collecting space area which characterized in that: the device comprises a tester base (1), a rack (2), a lower press plate (3), an upper press plate (4), an upper sliding clamp seat (5), a lower sliding clamp seat (6), a cross frame (7), a vertical force control device, a baffle (11), a protection ring (12), a pushing shaft shell (13), a fixing ring (14), scale marks (16), a fixing bolt (17), an arc-shaped clamp block (18), a fixing rolling shaft (19), an arc-shaped groove (20), a positioning groove (21), a transverse force control device, a transverse press plate (23), a side press plate (24), a side sliding clamp seat (25), a telescopic upright column (26), a pulley (27), a slide rail (28) and a fixing block (29);
The bottom of the frame (2) is connected with the tester base (1), and the top is connected with the transverse frame (7); the upper sliding clamping seat and the lower sliding clamping seat are respectively semi-cylindrical blocks, five positioning grooves located on the same central line are arranged on the lower sliding clamping seat (6), and the positioning grooves are separated by a baffle plate, so that tensile capacity test can be simultaneously carried out on 1-5 test pieces; the upper part of the upper sliding clamping seat is connected with the upper pressure plate, and the lower sliding clamping seat is connected with the lower pressure plate; the outer sides of the upper sliding clamping seat and the lower sliding clamping seat are provided with fixing rings which are used for connecting the upper sliding clamping seat and the lower sliding clamping seat; the fixing rings are respectively arranged between the upper pressure plate and the upper sliding clamping seat and between the lower pressure plate and the lower sliding clamping seat, and the middle part of the fixing ring is provided with a fixing bolt for respectively connecting the upper sliding clamping seat and the lower sliding clamping seat with the fixing ring; the outer side of the fixing ring is provided with an arc-shaped fixture block, and the fixing block is fixedly connected with the fixing blocks of the upper pressure plate and the lower pressure plate through the arc-shaped fixture block; the upper pressure plate, the lower pressure plate and the fixing ring are fixedly connected through arc-shaped clamping blocks, the arc-shaped clamping blocks are of the same structure between the upper pressure plate and the fixing ring and between the lower pressure plate and the fixing ring, the front end and the rear end of each arc-shaped clamping block are respectively provided with a fixing roller, the bottom of the upper pressure plate and the top of the lower pressure plate are respectively provided with a fixing block, an arc-shaped groove with a hollow inner part is arranged in each fixing block, the hollow part of each fixing block is used for placing the arc-shaped clamping block, the upper bottom surface and the lower bottom surface of each arc-shaped groove are respectively provided with a groove profile, the central angle corresponding to each small groove is 2 degrees, the fixing rollers are positioned between the upper bottom surface and the lower bottom surface of each arc-shaped groove, and the inclination angle of the inclined goaf is simulated by rotating the fixing rollers to be matched with the arc-shaped grooves;
Five fixing grooves are formed in the upper surface of the lower pressing plate (3) and used for placing the baffle (11) to ensure that the test piece cannot slide off in the rotation process of the device;
the transverse force control device is fixed on the side sliding clamping seat, the lower part of the side sliding clamping seat is connected with a side pressure plate (24), slide rails are arranged on two sides of the base, and the side pressure plate is connected with the base in a sliding way through a telescopic upright post;
the vertical force control device comprises a vertical hydraulic pushing shaft (8), a hydraulic oil cylinder (9) and a pressure sensor (10); the vertical force control device acts on the upper pressure plate through a hydraulic pushing shaft; the transverse force control device comprises a transverse hydraulic pushing shaft, a hydraulic oil cylinder (9) and a pressure sensor (10); the transverse hydraulic pushing shaft is controlled and adjusted by a hydraulic oil cylinder, acts on a test piece through a transverse pressing plate, realizes the loading with the same or different speeds on different test pieces, and is used for simulating the conditions of uniform stress and non-uniform stress of the test piece;
and the upper sliding clamping seat, the lower sliding clamping seat and the side sliding clamping seat are respectively provided with scale marks (16), so that the rotating angle can be accurately regulated and controlled.
2. The inclined gob single-row group column double-bearing capacity testing device as claimed in claim 1, wherein: the goaf is formed after coal seams with inclination angles of-50 degrees to 50 degrees are mined; the group column comprises one of a coal column group, an ore column group, a filling column group, a concrete column group, a coal column-filling column combined group column, an ore column-filling column combined group column and a coal column-concrete column combined group column; the section of the group column is circular or rectangular or triangular or trapezoidal.
3. The inclined gob single-row group column double-bearing capacity testing device as claimed in claim 1, wherein: five positioning grooves (21) are arranged on the lower pressure plate (3) and used for placing a test piece, the shapes of the positioning grooves correspond to the shapes of the test piece, and the central points of the positioning grooves (21) are positioned on the same straight line.
4. The inclined gob single-row group column double-bearing capacity testing device as claimed in claim 1, wherein: the central points of the transverse pressing plates (23) are positioned on the same straight line; side pressure disk (24) are installed on slide rail (28) through flexible stand (26) and pulley (27), and slide rail (28) are fixed on base (1), side pressure disk (24) are according to actual demand through flexible stand (26) height-adjusting, through slide rail (28) adjusting position.
5. The inclined gob single-row group column double-bearing capacity testing device as claimed in claim 1, wherein: the length, the width and the height of the baffle are respectively 300mm, 5mm and 90 mm; the length and the width of the upper sliding clamping seat and the lower sliding clamping seat are respectively 1000mm and 400 mm.
6. The inclined gob single-row group column double-bearing capacity testing device as recited in claim 1, wherein: and the vertical force control device and the transverse force control device are respectively provided with a pressure sensor, and the pressure sensors (10) are connected with a microcomputer through control circuits, so that the stress state of each test piece can be accurately displayed.
7. A method for testing double bearing capacity of a single-row legacy group column in an inclined goaf, which adopts the device for testing double bearing capacity of a single-row group column in the inclined goaf according to any one of claims 1 to 6, and is characterized by comprising the following steps:
the method comprises the following steps: the distribution position, the form and the size of the remaining grouped pillars in the horizontal goaf in the range to be tested are comprehensively investigated by utilizing the original geological technical data of the mine and by means of a supplementary exploration technical means;
step two: determining the size and the number of test pieces for testing based on the information of the horizontal goaf remaining grouped columns obtained in the step one;
step three: drilling a test piece with proper size by using a special core drilling machine for coal rock and a multi-speed manual feeding mode, and cutting and polishing the test piece to the shape and size required by the test by using a coal rock cutting machine;
step four: sequentially installing the test piece in a positioning groove (21) on a lower pressure plate (6); a baffle (11) is placed in the fixing groove; rotating the device to a target angle;
step five: clearing the force value of each sensor (10) to zero, and preloading;
step six: after preloading is finished, the baffle (11) is detached;
step seven: setting the magnitude of the transverse applied load and loading the load to a target value through a transverse hydraulic pushing shaft (22);
Step eight: after the transverse loading is finished, the loading speed of the hydraulic pushing shaft (8) is set for loading;
step nine: after loading is finished, the device is restored to be horizontal, the axial hydraulic pump (9) is used for controlling hydraulic pressure to push the shaft (8) to unload, and the test is finished.
8. The method for testing the double bearing capacity of the single-row legacy grouped column in the inclined gob according to claim 7, wherein: the diameter of the cylindrical test piece is not more than 150mm, and the length and the width of the square test piece are not more than 150 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110151088.7A CN112903465B (en) | 2021-02-04 | 2021-02-04 | Device and method for testing double bearing capacity of single-row group columns in inclined goaf |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110151088.7A CN112903465B (en) | 2021-02-04 | 2021-02-04 | Device and method for testing double bearing capacity of single-row group columns in inclined goaf |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112903465A CN112903465A (en) | 2021-06-04 |
| CN112903465B true CN112903465B (en) | 2022-06-14 |
Family
ID=76121904
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110151088.7A Active CN112903465B (en) | 2021-02-04 | 2021-02-04 | Device and method for testing double bearing capacity of single-row group columns in inclined goaf |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112903465B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116429593B (en) * | 2023-06-13 | 2023-08-22 | 山东黄金矿业科技有限公司充填工程实验室分公司 | Angle-variable bulk filling material testing device |
Citations (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0111898A1 (en) * | 1982-12-18 | 1984-06-27 | Arthur Lieberknecht | Bed bottom with cross beams and resilient connecting pieces |
| CN105547844A (en) * | 2015-12-13 | 2016-05-04 | 华北理工大学 | Filling body-pillar system mechanical effect mechanism test method |
| CN105716950A (en) * | 2016-03-29 | 2016-06-29 | 山东科技大学 | Strip coal pillar stability testing device and testing method |
| CN108398330A (en) * | 2018-01-30 | 2018-08-14 | 山东科技大学 | Ore pillar support system dynamic load stability test system and test method |
| CN108694272A (en) * | 2018-04-03 | 2018-10-23 | 太原理工大学 | A kind of residual exploiting field Upward mining feasibility determination method of tool post of dynamic disturbance load |
| CN109269899A (en) * | 2018-09-05 | 2019-01-25 | 中国矿业大学(北京) | A kind of goaf top plate fracture simulation test device |
| CN109991104A (en) * | 2019-05-06 | 2019-07-09 | 中国矿业大学(北京) | The staight scissors test device and its test method of Rock And Soil bulk material under Freezing-Melting Condition |
| CN110082227A (en) * | 2019-04-22 | 2019-08-02 | 太原理工大学 | Simulate the residual exploiting field coal column group of dynamic loading tool post formula stable tester and its method |
| CN110196315A (en) * | 2019-05-30 | 2019-09-03 | 余明高 | A kind of gas solid extraction and Study on Protection of Spontaneous Combustion coupling test system |
| CN110220770A (en) * | 2019-07-14 | 2019-09-10 | 湖南军成科技有限公司 | A kind of three-dimensional geological mechanical model analogue system |
| CN110374596A (en) * | 2019-06-13 | 2019-10-25 | 太原理工大学 | Method plasma H formula abatement thick and hard roof and leave the compound strong mine pressure of coal column |
| CN110514497A (en) * | 2019-09-03 | 2019-11-29 | 长沙理工大学 | The rocks sample rotation maintenance sample preparation device and method for making sample of controllable axial compressive force |
| CN110595897A (en) * | 2019-09-03 | 2019-12-20 | 武汉理工大学 | Similar material test loading system of anchor |
| CN111189756A (en) * | 2020-01-10 | 2020-05-22 | 中国矿业大学 | Broken rock mass-water-power coupling test system |
| CN111220452A (en) * | 2020-02-19 | 2020-06-02 | 辽宁工程技术大学 | True triaxial pressure chamber for coal rock simulation test and test method thereof |
| CN111307580A (en) * | 2019-11-01 | 2020-06-19 | 中国科学院武汉岩土力学研究所 | Disc rotation test device for simulating torsional fault rotation dislocation under three-dimensional stress |
| CN111579755A (en) * | 2020-06-28 | 2020-08-25 | 福州大学 | Stope filling body simulation experiment device and method |
| WO2021008278A1 (en) * | 2019-07-12 | 2021-01-21 | 河南理工大学 | High-speed railway goaf foundation pseudo-dynamic loading model test apparatus and method |
| CN112269015A (en) * | 2020-11-30 | 2021-01-26 | 安徽理工大学 | Inclined coal seam mining three-dimensional similarity test device with adjustable inclination angle of confined aquifer and test method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9063035B2 (en) * | 2013-06-03 | 2015-06-23 | The Boeing Company | Apparatus and method for load testing a coupon |
| CN103616293B (en) * | 2013-12-02 | 2015-10-28 | 安徽理工大学 | Colliery old gob caving band fragmented rock body secondary deformation compaction simulation experimental provision |
| CN103616295B (en) * | 2013-12-10 | 2015-08-05 | 山东科技大学 | A kind of non-standard rock sample bar mechanics parameter testing device and method of testing |
| CN109946164B (en) * | 2019-03-11 | 2020-07-24 | 中国矿业大学(北京) | Experiment platform and experiment method for simulating coal and rock catastrophe of coal mine stope |
| CN110542610A (en) * | 2019-08-30 | 2019-12-06 | 武汉理工大学 | rock mass stretching, compressing, shearing and twisting integrated test device |
-
2021
- 2021-02-04 CN CN202110151088.7A patent/CN112903465B/en active Active
Patent Citations (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0111898A1 (en) * | 1982-12-18 | 1984-06-27 | Arthur Lieberknecht | Bed bottom with cross beams and resilient connecting pieces |
| CN105547844A (en) * | 2015-12-13 | 2016-05-04 | 华北理工大学 | Filling body-pillar system mechanical effect mechanism test method |
| CN105716950A (en) * | 2016-03-29 | 2016-06-29 | 山东科技大学 | Strip coal pillar stability testing device and testing method |
| CN108398330A (en) * | 2018-01-30 | 2018-08-14 | 山东科技大学 | Ore pillar support system dynamic load stability test system and test method |
| CN108694272A (en) * | 2018-04-03 | 2018-10-23 | 太原理工大学 | A kind of residual exploiting field Upward mining feasibility determination method of tool post of dynamic disturbance load |
| CN109269899A (en) * | 2018-09-05 | 2019-01-25 | 中国矿业大学(北京) | A kind of goaf top plate fracture simulation test device |
| CN110082227A (en) * | 2019-04-22 | 2019-08-02 | 太原理工大学 | Simulate the residual exploiting field coal column group of dynamic loading tool post formula stable tester and its method |
| CN109991104A (en) * | 2019-05-06 | 2019-07-09 | 中国矿业大学(北京) | The staight scissors test device and its test method of Rock And Soil bulk material under Freezing-Melting Condition |
| CN110196315A (en) * | 2019-05-30 | 2019-09-03 | 余明高 | A kind of gas solid extraction and Study on Protection of Spontaneous Combustion coupling test system |
| CN110374596A (en) * | 2019-06-13 | 2019-10-25 | 太原理工大学 | Method plasma H formula abatement thick and hard roof and leave the compound strong mine pressure of coal column |
| WO2021008278A1 (en) * | 2019-07-12 | 2021-01-21 | 河南理工大学 | High-speed railway goaf foundation pseudo-dynamic loading model test apparatus and method |
| CN110220770A (en) * | 2019-07-14 | 2019-09-10 | 湖南军成科技有限公司 | A kind of three-dimensional geological mechanical model analogue system |
| CN110514497A (en) * | 2019-09-03 | 2019-11-29 | 长沙理工大学 | The rocks sample rotation maintenance sample preparation device and method for making sample of controllable axial compressive force |
| CN110595897A (en) * | 2019-09-03 | 2019-12-20 | 武汉理工大学 | Similar material test loading system of anchor |
| CN111307580A (en) * | 2019-11-01 | 2020-06-19 | 中国科学院武汉岩土力学研究所 | Disc rotation test device for simulating torsional fault rotation dislocation under three-dimensional stress |
| CN111189756A (en) * | 2020-01-10 | 2020-05-22 | 中国矿业大学 | Broken rock mass-water-power coupling test system |
| CN111220452A (en) * | 2020-02-19 | 2020-06-02 | 辽宁工程技术大学 | True triaxial pressure chamber for coal rock simulation test and test method thereof |
| CN111579755A (en) * | 2020-06-28 | 2020-08-25 | 福州大学 | Stope filling body simulation experiment device and method |
| CN112269015A (en) * | 2020-11-30 | 2021-01-26 | 安徽理工大学 | Inclined coal seam mining three-dimensional similarity test device with adjustable inclination angle of confined aquifer and test method |
Non-Patent Citations (2)
| Title |
|---|
| Simulation of recovery of upper remnant coal pillar while mining the ultra-close lower panel using longwall top coal caving;Guorui Feng 等;《International Journal of Mining Science and Technology》;20200130;第30卷(第1期);第55-61页 * |
| 遗留煤柱群链式失稳的关键柱理论及其应用展望;冯国瑞 等;《煤炭学报》;20210130;第46卷(第1期);第164-179页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112903465A (en) | 2021-06-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112858013B (en) | Device and method for testing tensile resistance of multi-row group columns in inclined goaf | |
| CN112903463B (en) | Double-shaft static force-disturbance coupling inclined goaf group column bearing test device and method | |
| CN104614497B (en) | True triaxial stream pressure fracturing, slot, seepage flow, gas drive integrated experimental system | |
| CN102866241B (en) | Three-directionally-loaded large-scale three-dimensional similarity simulation test method | |
| CN109855974B (en) | Overburden stress and deformation characteristic test method based on similar simulation test system | |
| CN102879547B (en) | Three-direction loading large-scale three-dimensional analog simulation test counterforce system | |
| CN102879549A (en) | Three-way load large-scale three-dimensional analog simulation test system | |
| CN112903465B (en) | Device and method for testing double bearing capacity of single-row group columns in inclined goaf | |
| CN110261234B (en) | Fractured rock mass separation layer anchoring control simulation test device and method | |
| CN102879284A (en) | Triaxial-loading large three-dimensional similar simulation test sample box | |
| CN108489797B (en) | Large-dip-angle coal rock stratum mechanical property physical simulation and test device | |
| CN102879548A (en) | Three-direction loading large-scale three-dimensional analog simulation test sampling method | |
| CN102879550B (en) | Three-dimensional loads the load simulated method of large-scale three dimensional resemble simulation test | |
| CN106601111A (en) | Large true-triaxial simulation test stand for tunnel roof support | |
| CN112903454B (en) | Horizontal goaf multi-row group column tensile strength testing device and method | |
| US11788930B2 (en) | Device and method for testing bearing capacity of single-row grouped pillars in horizontal goaf under biaxial loading | |
| CN112854323B (en) | Device and method for testing bearing capacity of multiple rows of group columns under single-shaft loading of inclined goaf | |
| CN112903460B (en) | Device and method for testing multi-row group column single-shaft bearing of inclined goaf under influence of disturbance | |
| CN112903453B (en) | Tensile capability testing device and method under inclined goaf multi-row group column disturbance load | |
| CN112881191B (en) | Device and method for testing single-axis bearing capacity of multi-row group columns in horizontal goaf | |
| CN112903464B (en) | Device and method for testing single-row group column double-shaft bearing capacity of goaf under influence of disturbance | |
| CN106228897B (en) | The prefabricated recycling replacing simulation system of face and method | |
| CN112903461B (en) | Device and method for testing single-axis bearing capacity of multiple rows of group columns of goaf under influence of disturbance | |
| CN105928440A (en) | Method for monitoring movement of exploitation top boards of three-dimensional physical simulation coal seam of mine | |
| CN112903452A (en) | Device and method for testing tensile strength of multiple rows of grouped columns in horizontal goaf under influence of disturbance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |