CN111982655A - Experimental device and method for testing mechanical characteristics of rock and soil mass under dynamic load and static load effects - Google Patents
Experimental device and method for testing mechanical characteristics of rock and soil mass under dynamic load and static load effects Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 55
- 230000003068 static effect Effects 0.000 title claims abstract description 26
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- 230000000694 effects Effects 0.000 title claims abstract description 6
- 239000011435 rock Substances 0.000 title description 3
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 82
- 239000010959 steel Substances 0.000 claims abstract description 82
- 238000006073 displacement reaction Methods 0.000 claims abstract description 36
- 238000012544 monitoring process Methods 0.000 claims description 9
- 238000002474 experimental method Methods 0.000 claims description 6
- 238000004088 simulation Methods 0.000 claims description 4
- 238000007405 data analysis Methods 0.000 claims description 3
- 238000005429 filling process Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 239000000523 sample Substances 0.000 description 10
- 238000013028 emission testing Methods 0.000 description 7
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- 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
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- 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
- G01N3/06—Special adaptations of indicating or recording means
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- 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
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- 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
- G01N2203/0026—Combination of several types of applied forces
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- 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
- G01N2203/0202—Control of the test
- G01N2203/0208—Specific programs of loading, e.g. incremental loading or pre-loading
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- 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
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0658—Indicating or recording means; Sensing means using acoustic or ultrasonic detectors
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- 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
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- 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
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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Abstract
The invention relates to an experimental device and a method for testing mechanical properties of a rock-soil body under dynamic load and static load effects, wherein the experimental device comprises the following steps: vertical direction constant voltage pole, rigid plate, flexible pad, left side prefabricated steel sheet, right side prefabricated steel sheet, hopkinson pressure pole, horizontal direction constant voltage pole, hopkinson pressure pole controller, horizontal direction constant voltage controller, acoustic emission detecting head, limiting plate, soil pressure cell, displacement sensor, test bench, vertical direction loading controller, test data acquisition ware, main frame and display. According to the invention, by adopting a loading mode combining dynamic loading and static loading on the rock-soil mass, the stress and deformation conditions of the combined rock-soil body layer sample in the actual environment can be better simulated, and theoretical support is provided for the subsequent engineering practice.
Description
Technical Field
The invention relates to an experimental device and an experimental method for a rock-soil body, in particular to an experimental device and an experimental method for testing mechanical characteristics of the rock-soil body under dynamic load and static load effects.
Background
At present, with the development of economy, the number of foundation pit and side slope projects is continuously increased, and the research on the safety of the foundation pit and the side slope is increasingly emphasized. The indoor model experiments aiming at the foundation pit and side slope engineering are similarity simulation experiments, and the internal structure damage positions, stress changes and displacement change information of the foundation pit and the side slope under the conditions of different dynamic loads and static loads under different conditions are calculated through the similarity.
The traditional device for researching the loading of the foundation pit and the side slope structure is mainly various static loading devices, the stress loading surface cannot set stress gradient, and the actual stress environment of a rock-soil layer cannot be better simulated for the foundation pit and the side slope in the area with special geological conditions, complex stress environment in the horizontal direction or strong earthquake activity.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an experimental device for testing the mechanical characteristics of a rock-soil body under the action of dynamic load and static load, which can better simulate the stress condition of a rock-soil layer under the actual environment by adopting a mode of combining dynamic load and static load to the simulated rock-soil layer.
The invention also aims to provide a method for testing the mechanical properties of the rock-soil mass under the action of dynamic load and static load.
According to the technical scheme provided by the invention, the experimental device for testing the mechanical property of the rock-soil body under the action of dynamic load and static load comprises an inner limiting plate and an outer limiting plate which are fixed on a test bed, wherein the inner limiting plate and the outer limiting plate are vertical to the table top of the test bed and are arranged in parallel, a plurality of layers of left prefabricated steel plates and right prefabricated steel plates are slidably arranged between the inner limiting plate and the outer limiting plate, the left prefabricated steel plates are vertical to the test bed and the table top of the limiting plates, the right prefabricated steel plates are vertical to the test bed and the table top of the limiting plates, the width of the left prefabricated steel plates in the same layer is equal to that of the right prefabricated steel plates, the upper end surfaces of the uppermost left prefabricated steel plates and the right prefabricated steel plates are flush with the upper end surfaces of the inner limiting plate and the outer limiting plate, and a Hopkinson pressure bar, the split-type acoustic emission testing device comprises split-type acoustic emission testing devices, split-type acoustic emission testing devices and a split-type acoustic emission testing device, wherein split-type acoustic emission testing devices are arranged on split-type acoustic emission testing devices, the split-type acoustic emission testing devices are arranged on the;
the method comprises the following steps that a filling space of a rock-soil layer is formed by a left prefabricated steel plate, a right prefabricated steel plate and an inner limiting plate and an outer limiting plate, the rock-soil layer to be detected is placed in the filling space, the upper surface of the rock-soil layer is flush with the upper end surfaces of the left prefabricated steel plate and the right prefabricated steel plate, the lower surface of the rock-soil layer is flush with the lower end surfaces of the left prefabricated steel plate and the right prefabricated steel plate, and a displacement sensor and a soil pressure cell are buried in the;
a vertical direction loading controller is arranged above the uppermost layer filling space, a plurality of vertical direction constant pressure rods are mounted on the vertical direction loading controller, a rigid plate is fixed at the lower end part of each vertical direction constant pressure rod, and a flexible pad is fixed on the lower surface of each rigid plate;
the test system also comprises a test data acquisition unit, a computer host and a display; the acoustic emission detecting head, the displacement sensor and the soil pressure box are all connected with a test data collector, the Hopkinson pressure bar controller, the horizontal constant pressure controller and the vertical loading controller are all connected with a computer host, and the computer host is connected with a display.
Preferably, the displacement sensor and the soil pressure cell are both arranged in the middle of the inner layer thickness of the rock-soil layer and correspond to the position between the left end of the horizontal constant pressure rod and the right end of the Hopkinson pressure rod, and a distance is reserved between the displacement sensor and the soil pressure cell.
Preferably, 3 acoustic emission detecting heads are arranged on the right side wall of the right prefabricated steel plate and take the constant pressure rod in the horizontal direction as the center.
Preferably, the filling space of the geotechnical layer is in a cuboid shape.
An experimental method for testing the mechanical characteristics of a rock-soil body under the action of dynamic load and static load comprises the following steps:
a: the Hopkinson pressure bar controller and the horizontal constant pressure controller are connected with a computer host, and the computer host is connected with a display; fixing each Hopkinson pressure bar of the Hopkinson pressure bar controller and the geometric center of the corresponding left prefabricated steel plate according to the thickness of each experimental rock-soil layer, fixing a horizontal constant pressure bar of a horizontal constant pressure controller and the geometric center of the corresponding right prefabricated steel plate, and ensuring that the mounting positions of the inner limiting plate and the outer limiting plate on the test bed are correct, so that the left prefabricated steel plate and the right prefabricated steel plate can freely slide along the horizontal direction between the two limiting plates;
b: filling each rock-soil layer into a filling space formed by a left prefabricated steel plate, a right prefabricated steel plate and an inner limiting plate and an outer limiting plate in a layered mode according to similar simulation requirements, and embedding a displacement sensor for monitoring soil body displacement parameters in the rock-soil layer and an earth pressure box for monitoring soil body pressure parameters in the rock-soil layer into the rock-soil layer in the filling process;
c: fixing an acoustic emission probe for monitoring energy release parameters of soil in a rock-soil layer on the right side wall of a right prefabricated steel plate to ensure that the acoustic emission probe is tightly attached to the right prefabricated steel plate without loosening, and connecting the acoustic emission probe, a displacement sensor and a soil pressure box with a test data collector connected with a computer host;
d: connecting a vertical loading controller with a computer host, wherein the vertical loading controller uniformly loads constant pressure in the vertical direction on the rock-soil layer on the uppermost layer through a vertical constant-pressure rod, a rigid plate and a flexible cushion according to experimental requirements;
e: according to the experimental requirements, the Hopkinson pressure bar controller applies different dynamic loads or the same dynamic load to each rock-soil layer, and stress concentration and deformation can occur in the rock-soil layers under the constant pressure action of the horizontal constant pressure bar and the vertical constant pressure bar;
f: the test data acquisition unit is used for acquiring data of soil body displacement parameters in the rock-soil layer monitored by the displacement sensor in the whole dynamic loading and static loading processes, pressure parameters of the soil body in the rock-soil layer monitored by the soil pressure box and energy release parameters monitored by the acoustic emission detection head in real time;
g: and transmitting the information acquired by the test data acquisition unit to a computer host for data analysis, and obtaining the displacement condition, the pressure condition and the energy release condition of the whole dynamic loading and static loading process of the experimental rock-soil layer and displaying the displacement condition, the pressure condition and the energy release condition on a display.
According to the invention, by adopting a loading mode combining dynamic loading and static loading on the rock-soil mass, the stress and deformation conditions of the combined rock-soil body layer sample in the actual environment can be better simulated, and theoretical support is provided for the subsequent engineering practice.
Drawings
Fig. 1 is a front view of the present invention.
Fig. 2 is a left side view of the present invention.
Fig. 3 is a right side view of the present invention.
Fig. 4 is a sectional view a-a of fig. 1.
Fig. 5 is a schematic block diagram of the circuit of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific examples.
An experimental device for testing the mechanical characteristics of a rock-soil body under the action of dynamic load and static load is characterized in that an inner limiting plate 10 and an outer limiting plate 10 are fixed on a test bed 15, the inner limiting plate 10 and the outer limiting plate 10 are perpendicular to the table surface of the test bed 15, the inner limiting plate 10 and the outer limiting plate 10 are arranged in parallel, a plurality of layers of left prefabricated steel plates 41 and right prefabricated steel plates 42 are slidably mounted between the inner limiting plate 10 and the outer limiting plate 10, the left prefabricated steel plates 41 are perpendicular to the test bed 15 and the table surface of the limiting plates 10, the right prefabricated steel plates 42 are perpendicular to the test bed 15 and the table surface of the limiting plates 10, the width of the left prefabricated steel plates 41 in the same layer is equal to the width of the right prefabricated steel plates 42, the upper end surfaces of the uppermost left prefabricated steel plates 41 and the upper end surfaces of the right prefabricated steel plates 42 are flush with the upper end surfaces of the inner limiting plate 10, the Hopkinson pressure bar controllers 7 are provided with Hopkinson pressure bars 5 the number of which is the same as the number of layers of the prefabricated steel plates, the right end part of each Hopkinson pressure bar 5 is aligned with the geometric center of the left side wall of the corresponding left prefabricated steel plate 41 for fixation, the test bed 15 on the right side of the right prefabricated steel plate 42 is fixedly provided with a horizontal constant pressure controller 8, the horizontal constant pressure controllers 8 are provided with horizontal constant pressure bars 6 the number of which is the same as the number of layers of the prefabricated steel plates, the left end part of each horizontal constant pressure bar 6 is aligned with the geometric center of the right side wall of the corresponding right prefabricated steel plate 42 for fixation, and the right side wall of the right prefabricated steel plate 42 is fixedly provided with an acoustic emission probe 9;
the method comprises the following steps that a filling space of a rock-soil layer 11 is formed by a left prefabricated steel plate 41, a right prefabricated steel plate 42 and an inner limiting plate 10 and an outer limiting plate 10, the rock-soil layer 11 to be detected is placed in the filling space, the upper surface of the rock-soil layer 11 is flush with the upper end surfaces of the left prefabricated steel plate 41 and the right prefabricated steel plate 42, the lower surface of the rock-soil layer 11 is flush with the lower end surfaces of the left prefabricated steel plate 41 and the right prefabricated steel plate 42, and a displacement sensor 14 and a soil pressure box 13 are embedded in the;
a vertical direction loading controller 16 is arranged above the uppermost layer filling space, a plurality of vertical direction constant pressure rods 1 are arranged on the vertical direction loading controller 16, a rigid plate 2 is fixed at the lower end part of each vertical direction constant pressure rod 1, and a flexible pad 3 is fixed on the lower surface of each rigid plate 2;
the test device also comprises a test data acquisition unit 100, a computer host 200 and a display 300; the acoustic emission detecting head 9, the displacement sensor 14 and the soil pressure box 13 are all connected with the test data collector 100, the Hopkinson pressure bar controller 7, the horizontal constant pressure controller 8 and the vertical loading controller 16 are all connected with the computer host 200, and the computer host 200 is connected with the display 300.
The displacement sensor 14 and the soil pressure box 13 are both arranged in the middle of the inner layer thickness of the rock and soil layer 11 and correspond to the position between the left end of the horizontal constant pressure rod 6 and the right end of the Hopkinson pressure rod 5, and a distance is reserved between the displacement sensor 14 and the soil pressure box 13.
3 acoustic emission detecting heads 9 are respectively arranged on the right side wall of the right prefabricated steel plate 42 and take the constant pressure rod 6 as the center along the horizontal direction.
The filling space of the rock-soil layer 11 is in a cuboid shape.
An experimental method for testing the mechanical characteristics of a rock-soil body under the action of dynamic load and static load comprises the following steps:
a: the Hopkinson pressure bar controller 7 and the horizontal constant pressure controller 8 are both connected with the computer host 200, and the computer host 200 is connected with the display 300; according to the thickness of each experimental rock-soil layer 11, fixing each Hopkinson pressure bar 5 of the Hopkinson pressure bar controller 7 with the geometric center of the corresponding left prefabricated steel plate 41, and fixing the horizontal constant pressure bar 6 of the horizontal constant pressure controller 8 with the geometric center of the corresponding right prefabricated steel plate 42, so that correct mounting positions of the inner limiting plate 10 and the outer limiting plate 10 on the test bed 15 are ensured, and the left prefabricated steel plate 41 and the right prefabricated steel plate 42 can freely slide along the horizontal direction between the two limiting plates 10;
b: filling each rock-soil layer 11 into a filling space formed by a left prefabricated steel plate 41, a right prefabricated steel plate 42 and an inner limiting plate 10 and an outer limiting plate 10 in a layered mode according to similar simulation requirements, and burying a displacement sensor 14 for monitoring soil body displacement parameters in the rock-soil layer 11 and an earth pressure box 13 for monitoring soil body pressure parameters in the rock-soil layer 11 in the filling process;
c: fixing an acoustic emission probe 9 for monitoring energy release parameters of soil in a rock-soil layer 11 on the right side wall of a right prefabricated steel plate 42 to ensure that the acoustic emission probe 9 is tightly attached to the right prefabricated steel plate 42 without loosening, connecting the acoustic emission probe 9, a displacement sensor 14 and a soil pressure box 13 with a test data acquisition unit 100, and connecting the test data acquisition unit 100 with a computer host 200;
d: connecting a vertical loading controller 16 with a computer host 200, wherein the vertical loading controller 16 uniformly loads a constant pressure in the vertical direction on the rock-soil layer 11 on the uppermost layer through a vertical constant-pressure rod 1, a rigid plate 2 and a flexible pad 3 according to experimental requirements;
e: according to the experimental requirements, the Hopkinson pressure bar controller 7 applies different dynamic loads or the same dynamic load to each rock-soil layer 11, and stress concentration and deformation can occur in the rock-soil layers 11 under the constant pressure action of the horizontal constant pressure bar 6 and the vertical constant pressure bar 1;
f: the test data acquisition unit 100 acquires data of soil displacement parameters in the rock-soil layer 11 monitored by the displacement sensor 14, pressure parameters of soil in the rock-soil layer 11 monitored by the soil pressure box 13 and energy release parameters monitored by the acoustic emission probe 9 in the whole dynamic loading and static loading processes in real time;
g: the information collected by the test data collector 100 is transmitted to the computer host 200 for data analysis, so that the displacement condition, the pressure condition and the energy release condition of the experimental rock-soil layer 11 in the whole dynamic loading and static loading processes can be obtained and displayed on the display 300.
In the invention, the number of the Hopkinson pressure bars 5 and the number of the horizontal constant pressure bars 6 are set according to the number of layers of the experimental rock-soil layer 11.
In the invention, the Hopkinson pressure bar controller 7, the horizontal constant pressure controller 8 and the vertical loading controller 16 are all controlled by adopting a PLC.
In the invention, the acoustic emission probe 9 adopts a PXWAE-4G 4 channel gigabit network acoustic emission instrument provided by Changshaneng and Pengxiang electronic technology company Limited; the soil pressure cell 13 adopts a TGH type vibrating wire type soil pressure cell provided by Tanake Daloxel sensor technology Co., Ltd; the displacement sensor 14 is provided by Nanjing Pugnan industry Co., Ltd for a volume VWD-C vibrating wire type soil displacement meter.
In the invention, the test data acquisition unit 100 comprises a GSJ-2A type computer detector matched with the soil pressure cell 13 and a GDA1602(4) type vibrating wire acquisition module matched with the displacement sensor 14.
Claims (5)
1. The utility model provides an experimental apparatus of mechanical properties under test ground body dynamic load, static loading effect which characterized by: an inner limiting plate and an outer limiting plate (10) are fixed on a test bed (15), the inner limiting plate and the outer limiting plate (10) are perpendicular to the table surface of the test bed (15), the inner limiting plate and the outer limiting plate (10) are arranged in parallel, a plurality of layers of left prefabricated steel plates (41) and right prefabricated steel plates (42) are slidably mounted between the inner limiting plate and the outer limiting plate (10), the left prefabricated steel plates (41) are perpendicular to the test bed (15) and perpendicular to the table surface of the limiting plates (10), the width of the left prefabricated steel plates (41) in the same layer is equal to that of the right prefabricated steel plates (42), the upper end surfaces of the left prefabricated steel plates (41) and the right prefabricated steel plates (42) on the uppermost layer are flush with the upper end surfaces of the inner limiting plate and the outer limiting plate (10), a Hopkinson pressure bar controller (7) is fixed on the test bed (15) on the left side of the left prefabricated steel plates (41), the device comprises a Hopkinson pressure bar controller (7), Hopkinson pressure bars (5) of which the number is the same as the number of layers of prefabricated steel plates are arranged on the Hopkinson pressure bar controller (7), the right end part of each Hopkinson pressure bar (5) is aligned to the geometric center of the left side wall of a left prefabricated steel plate (41) corresponding to the Hopkinson pressure bar and fixed, a horizontal constant pressure controller (8) is fixed on a test bed (15) on the right side of a right prefabricated steel plate (42), horizontal constant pressure bars (6) of which the number is the same as the number of layers of the prefabricated steel plates are arranged on the horizontal constant pressure controller (8), the left end part of each horizontal constant pressure bar (6) is aligned to the geometric center of the right side wall of a right prefabricated steel plate (42) corresponding to the horizontal constant pressure bar and fixed, and an acoustic;
a filling space of a rock-soil layer (11) is formed by a left prefabricated steel plate (41), a right prefabricated steel plate (42) and an inner limiting plate and an outer limiting plate (10), the rock-soil layer (11) to be detected is placed in the filling space, the upper surface of the rock-soil layer (11) is flush with the upper end surfaces of the left prefabricated steel plate (41) and the right prefabricated steel plate (42), the lower surface of the rock-soil layer (11) is flush with the lower end surfaces of the left prefabricated steel plate (41) and the right prefabricated steel plate (42), and a displacement sensor (14) and a soil pressure box (13) are embedded in the rock-soil layer (11);
a vertical direction loading controller (16) is arranged above the uppermost layer filling space, a plurality of vertical direction constant pressure rods (1) are mounted on the vertical direction loading controller (16), a rigid plate (2) is fixed at the lower end part of each vertical direction constant pressure rod (1), and a flexible pad (3) is fixed on the lower surface of each rigid plate (2);
the test system also comprises a test data acquisition unit (100), a computer host (200) and a display (300); the acoustic emission detecting head (9), the displacement sensor (14) and the soil pressure box (13) are all connected with the test data collector (100), the Hopkinson pressure bar controller (7), the horizontal constant pressure controller (8) and the vertical loading controller (16) are all connected with the computer host (200), and the computer host (200) is connected with the display (300).
2. The experimental device for testing the mechanical properties of the rock-soil body under the action of dynamic load and static load according to claim 1, wherein the experimental device comprises: the displacement sensor (14) and the soil pressure box (13) are both arranged at the thick middle position of the inner layer of the rock-soil layer (11) and correspond to the positions between the left end part of the horizontal constant pressure rod (6) and the right end part of the Hopkinson pressure rod (5), and a distance is arranged between the displacement sensor (14) and the soil pressure box (13).
3. The experimental device for testing the mechanical properties of the rock-soil body under the action of dynamic load and static load according to claim 1, wherein the experimental device comprises: 3 acoustic emission detecting heads (9) are arranged on the right side wall of the right prefabricated steel plate (42) and take a constant pressure rod (6) in the horizontal direction as the center.
4. The experimental device for testing the mechanical properties of the rock-soil body under the action of dynamic load and static load according to claim 1, wherein the experimental device comprises: the filling space of the rock-soil layer (11) is in a cuboid shape.
5. An experimental method for testing the mechanical characteristics of a rock-soil body under the action of dynamic load and static load comprises the following steps:
a: the Hopkinson pressure bar controller (7) and the horizontal constant pressure controller (8) are connected with a computer host (200), and the computer host (200) is connected with a display (300); according to the thickness of each experimental rock-soil layer (11), fixing each Hopkinson pressure bar (5) of a Hopkinson pressure bar controller (7) with the geometric center of the corresponding left prefabricated steel plate (41), fixing a horizontal constant pressure bar (6) of a horizontal constant pressure controller (8) with the geometric center of the corresponding right prefabricated steel plate (42), and ensuring that the mounting positions of the inner limiting plate and the outer limiting plate (10) on the test bed (15) are correct, so that the left prefabricated steel plate (41) and the right prefabricated steel plate (42) can freely slide along the horizontal direction between the two limiting plates (10);
b: filling each rock-soil layer (11) into a filling space formed by a left prefabricated steel plate (41), a right prefabricated steel plate (42) and an inner limiting plate and an outer limiting plate (10) in a layered mode according to similar simulation requirements, and burying a displacement sensor (14) for monitoring the displacement parameters of soil bodies in the rock-soil layer (11) and a soil pressure box (13) for monitoring the pressure parameters of the soil bodies in the rock-soil layer (11) in the filling process;
c: fixing an acoustic emission detecting head (9) for monitoring soil energy release parameters in a rock-soil layer (11) on the right side wall of a right prefabricated steel plate (42) to ensure that the acoustic emission detecting head (9) is tightly attached to the right prefabricated steel plate (42) without loosening, connecting the acoustic emission detecting head (9), a displacement sensor (14) and a soil pressure box (13) with a test data collector (100), and connecting the test data collector (100) with a computer host (200);
d: connecting a vertical loading controller (16) with a computer host (200), wherein the vertical loading controller (16) uniformly loads a constant pressure in the vertical direction on the rock-soil layer (11) on the uppermost layer through a vertical constant-pressure rod (1), a rigid plate (2) and a flexible pad (3) according to experimental requirements;
e: according to the experimental requirements, the Hopkinson pressure bar controller (7) applies different dynamic loads or the same dynamic load to each rock-soil layer (11), and under the constant pressure action of the horizontal constant pressure bar (6) and the vertical constant pressure bar (1), stress concentration and deformation can occur in the rock-soil layers (11);
f: the test data acquisition unit (100) acquires data of soil body displacement parameters in the rock-soil layer (11) monitored by the displacement sensor (14) in the whole dynamic loading and static loading processes, pressure parameters of soil body in the rock-soil layer (11) monitored by the soil pressure box (13) and energy release parameters monitored by the acoustic emission detection head (9) in real time;
g: the information collected by the test data collector (100) is transmitted to the computer host (200) for data analysis, so that the displacement condition, the pressure condition and the energy release condition of the whole dynamic loading and static loading process of the experimental rock-soil layer (11) can be obtained and displayed on the display (300).
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| CN102620992A (en) * | 2012-04-01 | 2012-08-01 | 中交上海三航科学研究院有限公司 | Loading system and method for simulating soil pressure in test room |
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