CN112540004A - Underground engineering three-way loading test device with displacement feedback and loading test method - Google Patents
Underground engineering three-way loading test device with displacement feedback and loading test method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses an underground engineering three-way loading test device with displacement feedback, which comprises a fixed frame, a movable skip car, a loading device, a traction system, a hydraulic system and an electric control system, wherein the upper part of the fixed frame is provided with a vertical loading device to realize loading in a first direction from top to bottom, the left side and the right side of the movable skip car are respectively provided with the loading device to realize loading in a second direction and a third direction from the left side to the right side and from the right side to the left side, and are vertical to the vertical first loading direction, the lower part of the movable skip car is provided with the traction system to realize moving in or out of the fixed frame of the movable skip car, the hydraulic system provides pressure load for the loading device, and the electric control system has displacement feedback control to realize accurate displacement control of each moving device. The invention also discloses a loading test method of the test device. By adopting the device and the method, the stress of the test model can be more practical, the test process is more convenient and faster, and the test cost is lower.
Description
Technical Field
The invention relates to the field of geotechnical engineering model tests, in particular to an underground engineering three-way loading test device with displacement feedback and a loading test method.
Background
With the continuous advance of underground engineering represented by tunnels in China, how to evaluate the design quality of the underground tunnel engineering and how to ensure the rationality of the engineering structure design is an increasingly challenging problem. The research relates to the mechanical fields of geotechnical engineering, structural engineering, seepage, vibration and the like, and the influence of traffic load on the engineering is very obvious.
At present, a practical and effective analysis method is lacked at home and abroad, estimation is mainly carried out by depending on engineering experience, and great blindness is achieved; in order to compensate the limitation of theoretical analysis and verify the rationality of the theoretical analysis, especially the structural design rationality of underground engineering under different load conditions, a simulation test method is necessary.
In the process of model test, because the stress state of underground engineering such as a tunnel and the like is simulated, loading in three directions, namely tunnel top loading and tunnel two-side loading, is required to be realized in the cross section of the tunnel, namely a vertical plane, and parameters such as deformation and the like in a tunnel model are required to be observed, so that a closed three-dimensional space is required to be formed. Therefore, how to conveniently fill the test materials, load the pressure, observe the test state and unload the test materials in the test is an urgent problem to be solved; the existing scheme adopts a fixed experimental box body like Zhang Zixin CN102235942A multifunctional model test system for tunnel and underground engineering of Ji university, which is very inconvenient. The present invention has been made in view of this background.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, discloses an underground engineering three-way loading test device with displacement feedback and a loading test method, solves the problem of inconvenience in loading and unloading test filling materials, can conveniently realize a three-way loading test, and accurately controls the displacement of each moving part of the test device.
The first technical scheme adopted by the invention is that the underground engineering three-way loading test device with displacement feedback comprises a fixed frame, a movable skip car, a loading device, a traction system, a hydraulic system and an electric system, a vertical loading device is arranged at the upper part of the fixed frame to realize the first direction loading from top to bottom, a loading device is arranged on the left side of the movable skip car to realize the loading in the second direction from the left side to the right side, a loading device is arranged on the right side of the movable skip car to realize loading in a third direction from the right side to the left side, the second loading direction is just opposite to the third loading direction, the hydraulic system provides pressure load for the loading device, and the electric control system is used for realizing the loading displacement feedback control of the loading test device.
In the above scheme, the electric control system includes a plurality of loading displacement sensors, the loading device includes a loading head, a loading rod, and a loading seat, wherein, because the three surfaces on the fixed frame and the movable skip car are provided with the loading device, the loading seat of the loading device is respectively installed on two side surfaces of the fixed frame and the skip car frame of the movable skip car, the loading head is connected to the loading rod, the loading head applies a pressure load to the test material, the loading seat transmits a counter force to the fixed frame or the movable skip car, the loading rod and the loading seat can realize relative motion under the action of the hydraulic system, and the loading displacement sensors are arranged between the loading head and the loading seat and used for feeding back displacement information between the loading head and the loading seat.
Furthermore, the movable skip car comprises a front door, a rear door and a skip car frame, and after the movable skip car enters the fixed frame, the front door, the rear door, loading heads of loading devices on the left side and the right side of the movable skip car, the bottom of the skip car frame and the loading devices on the upper portion of the fixed frame form a closed three-dimensional space together for filling test materials and performing loading tests on the materials in three directions.
The rear door of the movable skip car comprises a rear door plate, a rear door driving oil cylinder, a guide wheel and a rear door guide rail; the rear door plate is connected with a piston rod of a rear door driving oil cylinder, an oil cylinder seat of the rear door driving oil cylinder is connected with the skip frame, a guide wheel is arranged below the rear door plate and supports the rear door plate on a rear door guide rail, the rear door guide rail is arranged above the bottom of the movable skip, and the rear door driving oil cylinder drives the rear door plate to move in the front-back direction relative to the skip frame so as to realize a regional loading test; the electric control system comprises a plurality of rear door displacement sensors, and the rear door displacement sensors are arranged between the rear door plate and the skip frame and used for feeding back displacement information between the rear door plate and the skip frame.
Furthermore, a lifting oil cylinder and a plurality of support legs are arranged at the lower part of a skip frame of the movable skip, and a traction system connected with the lower part of the movable skip comprises a tractor, a traction frame, a roller and a skip guide rail; the upper part of a traction frame of the traction system is connected with the lower part of the skip frame through a lifting oil cylinder, the lifting oil cylinder can drive the movable skip to move up and down, and a skip guide rail is fixed on the fixed frame; the electric control system comprises a plurality of skip car displacement sensors, and the skip car displacement sensors are arranged between the movable skip car and the fixed frame and used for feeding back displacement information between the movable skip car and the fixed frame; when the lifting oil cylinder extends, the distance between the traction frame and the skip frame is increased until the idler wheel on the traction frame contacts with the guide rail, meanwhile, the support leg on the lower part of the movable skip is separated from the fixed frame, the idler wheel can roll on the guide rail, and a traction system can be adopted to carry out traction on the movable skip, so that the movable skip enters or leaves the fixed frame; when the lifting oil cylinder is shortened, the distance between the traction frame and the skip car frame is reduced until the support legs at the lower part of the movable skip car are in contact with the fixed frame, and the rollers on the traction frame are separated from the guide rails, so that all loads on the movable skip car are transmitted to the fixed frame through the support legs, and the rollers of the traction system and the lifting oil cylinder are convenient to reduce stress in the loading test process.
By adopting the first technical means, the present invention can achieve the following technical effects.
The invention provides an underground engineering three-way loading test device with displacement feedback, which comprises a fixed frame, a movable skip car, a loading device, a traction system, a hydraulic system, an electric control system and the like, wherein the loading device is respectively arranged at the upper part of the fixed frame and at two sides of the movable skip car to form loading functions in three directions together, so that the real stress states of the top and two sides of underground engineering such as tunnels and the like can be simulated. Preferably, the electric control system comprises a skip car displacement sensor, a loading displacement sensor and a rear door displacement sensor; the movable trolley can be moved out of the fixed frame by matching with the traction system, so that test materials can be conveniently filled, a test instrument can be conveniently installed, and the vertical displacement between the trolley and the fixed frame is controlled through feedback information of a trolley displacement sensor; the loading displacement of the loading device can be accurately controlled through feedback information of the loading displacement sensor; the rear door of the movable skip car can move back and forth relative to the skip car frame, so that the test area can be conveniently adjusted, the requirements of different tests are met, and the relative position of the rear door plate can be accurately controlled by using the feedback displacement information of the rear door displacement sensor.
The second technical scheme of the invention is that the underground engineering three-way loading test method with displacement feedback adopts the preferable combination scheme of the underground engineering three-way loading test device, and the loading test method comprises the following four steps:
the method comprises the following steps that firstly, when a test is prepared, a movable skip car is arranged on the outer side of a fixed frame, and test materials, a pre-buried test model and relevant test sensors are filled in the movable skip car;
secondly, after the movable skip car is drawn to a preset position in the fixed frame through the traction system, the lifting oil cylinder under the movable skip car is shortened, the movable skip car slowly descends, the skip car displacement sensor detects displacement information between the movable skip car and the fixed frame and performs feedback control, the supporting legs are made to contact with the fixed frame, the idler wheels are made to be separated from the guide rails, and the load of the movable skip car is transmitted to the fixed frame through the supporting legs;
loading the test material from three directions respectively or simultaneously, feeding back loading displacement information through a loading displacement sensor, recording test data, and resetting a loading device at the top after the loading test is finished;
and fourthly, extending the lifting oil cylinder at the lower part of the movable skip, detecting the displacement information between the movable skip and the fixed frame through a skip displacement sensor and carrying out feedback control until each roller contacts the guide rail and the support leg is separated from the fixed frame, so that the load of the movable skip is uniformly transmitted to the fixed frame through the rollers and the guide rail, the movable skip is pulled to the outer side of the fixed frame through a traction system, the test material is cleaned, and the preparation is prepared for the next test.
Preferably, the underground engineering three-way loading test device with displacement feedback is adopted, a structure capable of moving the rear door panel in a front-back direction in parallel is adopted, and the loading test method comprises five steps:
and before the four steps, adding a pre-operation step, adopting feedback information of a rear door displacement sensor to move the rear door plate to a set position in parallel, and then performing the four steps.
By adopting the second technical solution, the present invention can achieve the following technical effects.
According to the underground engineering three-way loading test method with displacement feedback, provided by the invention, the lifting oil cylinder between the movable skip car and the traction frame is accurately controlled to be shortened in a feedback manner by detecting the displacement feedback information of the skip car displacement sensor, so that the loading load generated in the vertical direction during loading can be uniformly transmitted to the fixed frame through the supporting legs, and the roller wheel is prevented from being overloaded; the lifting oil cylinder between the movable skip car and the traction frame is controlled to extend through accurate feedback, so that the movable skip car can be moved out by rolling of the rollers when the movable skip car is moved out of the fixed frame, and traction force is reduced; the test material adding and cleaning device is convenient and quick, and the stress transmission in the test loading process is safe and reliable. Preferably, through the feedback information who detects back door displacement sensor, accurate feedback control parallel movement back door plant to preset position can reduce the test area to a certain extent, reduces test cost.
Drawings
FIG. 1 is a schematic diagram of the general assembly of the structure of an underground engineering three-way loading test device with displacement feedback;
FIG. 2 is a schematic front structural view of a mobile skip, a loading device, a traction part and the like of the underground engineering three-way loading test device with displacement feedback;
FIG. 3 is a rear structural schematic diagram of a mobile skip car and a loading device of the underground engineering three-way loading test device with displacement feedback;
FIG. 4 is a schematic structural diagram of a loading device, a front door, a rear door, a skip car frame base and the like of the underground engineering three-way loading test device with displacement feedback;
FIG. 5 is a schematic structural diagram of a fixed frame, a loading device, a sensor and the like of the underground engineering three-way loading test device with displacement feedback;
FIG. 6 is a schematic view of the rear door translation one-third position of the underground three-way loading test device with displacement feedback according to the present invention;
FIG. 7 is a schematic view of the two-thirds translational position of the rear door of the underground three-way loading test device with displacement feedback;
FIG. 8 is a flow chart of a first step of a method of the present invention for a three-way load test of subterranean engineering with displacement feedback;
FIG. 9 is a flow chart of a second step of the method of the present invention for a three-way load test of underground works with displacement feedback;
in the figure, 1 is a fixed frame, 2 is a movable skip, 21 is a front door, 22 is a rear door, 221 is a rear door plate, 222 is a rear door driving oil cylinder, 223 is a guide wheel, 224 is a rear door guide rail, 23 is a skip frame, 24 is a lifting oil cylinder, 25 support legs, 3 is a loading device, 31 is a loading head, 32 is a loading rod, 33 is a loading seat, 4 is a traction system, 41 is a tractor, 42 is a traction frame, 43 is a roller, 44 is a skip guide rail, 5 is a hydraulic system, 6 is an electric control system, 61 is a loading displacement sensor, 62 is a rear door displacement sensor, and 63 is a skip displacement sensor.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention are described clearly and completely below with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, provided in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of preferred embodiments of the invention.
In the description of the present invention, it is to be understood that the terms "front", "rear", "left", "right", "vertical", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
The structure, function and loading test method of the solution of the present application will now be described in detail with reference to fig. 1 to 9.
Preferred embodiment 1:
the preferred embodiment 1 of the present invention provides an underground engineering three-way loading test device with displacement feedback, referring to fig. 1 to 7, which comprises a fixed frame 1, a movable skip 2, a loading device 3, a traction system 4, a hydraulic system 5, and an electric control system 6, wherein the upper part of the fixed frame 1 is provided with a vertical loading device 3 for realizing loading in a first direction from top to bottom, the left side of the movable skip 2 is provided with the loading device 3 for realizing loading in a second direction from left to right, the right side of the movable skip 2 is provided with the loading device 3 for realizing loading in a third direction from right to left, the second loading direction is right opposite to the third loading direction, the second loading direction is perpendicular to the vertical first loading direction and is on the same projection plane, the lower part of the movable skip 2 is provided with the traction system 4 for realizing moving the movable skip 2 into or out of the fixed frame 1, the hydraulic system 5 respectively provides pressure loads for the loading devices 3 in three directions, the electric control system 6 is used for realizing the loading displacement feedback control of the loading test device.
Preferably, in the present embodiment, as shown in fig. 3, 4 and 5, the loading device 3 includes a loading head 31, a loading rod 32, and a loading seat 33, wherein, since the loading device 3 is provided on three surfaces in total on the fixed frame 1 and the moving skip 2, the loading seats of the loading device 3 are respectively installed on the fixed frame 1 and on both side surfaces of the skip frame 23 of the moving skip 2, the loading head 31 is coupled to the loading rod 32, the loading head 31 applies pressure loads to the test material from three directions respectively, and the loading seats 33 in three directions transmit counter forces to the fixed frame 1 or the moving skip 2 respectively; the loading rod 32 and the loading seat 33 can realize relative movement under the action of the hydraulic system 5; when the loading rod 32 extends out of the loading seat 33, loading is carried out; when the loading rod 32 retracts into the loading seat 33, unloading is carried out; the loading displacement sensor 61 is arranged between the loading head 31 and the loading seat 33 and used for feeding back displacement information between the loading head 31 and the loading seat 33. Preferably, in the present embodiment, as shown in fig. 4, 3 rows and 3 columns of loading devices 3 are arranged in an array on the left and right sides of the moving cart 2, and the corresponding 3 rows and 3 columns of loading devices 3 are arranged in an array on the upper portion of the fixed frame 1, which together constitute three loading surfaces. Each loading surface has 9 loading devices 3, 27 in total, and each loading device can be loaded independently or jointly.
Preferably, in the present embodiment, as shown in fig. 1, fig. 2 and fig. 3, the moving trolley 2 further includes a lift cylinder 24 and 9 support legs 25; the traction system 4 comprises a tractor 41, a traction frame 42, a roller 43 and a skip guide rail 44; the lower part of the movable skip car 2 is connected with a traction frame 42, the upper part of the traction frame 42 is connected with the lower part of the skip car frame 23 through a lifting oil cylinder 24, and the lifting oil cylinder 24 can drive the movable skip car 2 to move up and down; when the lifting oil cylinder 24 extends, the distance between the traction frame 42 and the skip car frame 23 is increased until the roller 43 on the traction frame 42 is contacted with the skip car guide rail 44; meanwhile, the supporting legs 25 at the lower part of the movable skip car 2 are separated from the fixed frame 1, the rollers 43 can roll on the skip car guide rails 44, and a traction system can be adopted to carry out 2 traction on the movable skip car, so that the movable skip car 2 enters or leaves the fixed frame 1; when the lifting oil cylinder 24 is shortened, the distance between the traction frame 42 and the skip frame 23 is reduced until the support leg 25 at the lower part of the movable skip 2 is contacted with the lower part of the fixed frame 1, the roller 43 on the traction frame 42 is separated from the skip guide rail 44, so that all loads on the movable skip 2 are transmitted to the fixed frame 1 through the support leg 25, the roller 42 and the lifting oil cylinder 24 are prevented from being damaged by overload stress in the loading test process, and a skip displacement sensor 63 is arranged between the movable skip and the fixed frame and used for feeding back displacement information between the movable skip 2 and the fixed frame 1.
The loading test method of this example 1 is divided into four steps as shown in fig. 8:
firstly, in test preparation, a movable skip car 2 is arranged on the outer side of a fixed frame 1, and test materials, a pre-buried test model and related test sensors are filled in the movable skip car 2;
secondly, after the moving skip 2 is pulled to a preset position in the fixed frame 1 through the traction system 4, the lifting oil cylinder 24 under the moving skip 2 is shortened, the moving skip 2 slowly descends, the skip displacement sensor 63 detects the displacement between the moving skip 2 and the fixed frame 1 and performs feedback control, so that the supporting legs 25 contact the fixed frame 1, the rollers 43 are separated from the guide rails, and the load of the moving skip 2 is transmitted to the fixed frame 1 through the supporting legs 25;
thirdly, loading the test materials from three directions respectively or simultaneously, feeding back loading displacement information through a loading displacement sensor 61, recording test data, and resetting the loading device 3 at the top after the loading test is finished;
fourthly, extending the lifting oil cylinders 24 at the lower part of the moving skip car 2, detecting the displacement between the moving skip car 2 and the fixed frame 1 through a skip car displacement sensor 63, performing feedback control until each roller 43 contacts the guide rail 44 and the support legs 25 are separated from the fixed frame 1, uniformly transmitting the load of the moving skip car 2 to the fixed frame 1 through the rollers 43 and the guide rail 44, drawing the moving skip car 2 to the outer side of the fixed frame 1 through a traction system 4, cleaning the test materials, and preparing for the next test.
Preferred embodiment 2:
in addition to the preferred embodiment 1, as shown in fig. 4, the rear door 22 further includes a rear door panel 221, a rear door driving cylinder 222, a rear door guide wheel 223, and a rear door guide rail 224. The rear door plate 221 is connected with a piston rod of a rear door driving oil cylinder 222, an oil cylinder seat of the rear door driving oil cylinder 222 is connected with the skip frame 23, a guide wheel 223 is arranged below the rear door plate 221, the rear door plate 221 is supported on a rear door guide rail 224, the rear door guide rail 224 is arranged above the bottom of the movable skip 2, and the rear door driving oil cylinder 222 drives the rear door plate 221 to move in the front-back direction relative to the skip frame 23, so that a regional loading test is realized; fig. 6 is a schematic view showing one third of the translational position of the rear door panel 221 of the underground three-way loading test device with displacement feedback according to the present invention, and fig. 7 is a schematic view showing two thirds of the translational position of the rear door panel 221 of the underground three-way loading test device with displacement feedback according to the present invention; a rear door displacement sensor 62 is arranged between the rear door panel 221 and the skip frame 23 and used for feeding back displacement information between the rear door panel 221 and the skip frame 23; before the loading test, the displacement information fed back by the rear door displacement sensor 62 needs to be detected, and the rear door panel 221 is moved to a predetermined position. The loading test device is beneficial to meeting the requirements of loading tests in different areas.
Preferably, other structures or effects not mentioned in preferred embodiment 2 can be referred to preferred embodiment 1.
The loading test method of this example 2 is divided into five steps as shown in fig. 9: that is, on the basis of the loading method of the preferred embodiment 1, a preliminary step is added, the rear door panel 221 is precisely feedback-controlled to move in parallel to a predetermined position by detecting the displacement information fed back by the rear door displacement sensor 62, and then the subsequent four steps are performed. Therefore, the range size of the test area can be changed according to test requirements, and the test cost is reduced or a specific structure model is tested.
The above-mentioned preferred embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. The utility model provides an underground works three-dimensional loading test device with displacement feedback which characterized in that: the loading device is arranged on the left side of the movable trolley, loading in the third direction from the right side to the left side is achieved, the second loading direction is right opposite to the third loading direction and perpendicular to the first vertical loading direction, the traction system is arranged on the lower portion of the movable trolley, moving or moving out of the movable trolley is achieved, the hydraulic system provides pressure load for the loading device, and the electric control system is used for achieving loading displacement feedback control of the loading test device.
2. An underground works three-way loading test device with displacement feedback according to claim 1, characterized in that: the electric control system comprises a plurality of loading displacement sensors, the loading device comprises a loading head, a loading rod and a loading seat, the loading seat is connected with the fixed frame or the movable skip car, the loading rod is connected with the loading head, the loading head applies pressure load to the test material, the loading seat transmits counter force to the fixed frame or the movable skip car, the loading rod and the loading seat can realize relative motion under the action of a hydraulic system, and the loading displacement sensors are arranged between the loading head and the loading seat and used for feeding back displacement information between the loading head and the loading seat.
3. An underground works three-way loading test device with displacement feedback according to claim 1, characterized in that: the movable skip car comprises a front door arranged at the front part, a rear door arranged at the rear part and a skip car frame; the rear door of the movable skip car comprises a rear door plate, a rear door driving oil cylinder, a guide wheel and a rear door guide rail; the electric control system comprises a plurality of rear door displacement sensors; the rear door plate is connected with a piston rod of a rear door driving oil cylinder, an oil cylinder seat of the rear door driving oil cylinder is connected with the skip frame, the guide wheel is arranged below the rear door plate and supports the rear door plate on a rear door guide rail, the rear door driving oil cylinder drives the rear door plate to move in the front-rear direction and realize a sub-region loading test, and a rear door displacement sensor is arranged between the rear door plate and the skip frame and used for feeding back displacement information between the rear door plate and the skip frame.
4. An underground works three-way loading test device with displacement feedback according to claim 1, characterized in that: the electric control system comprises a plurality of skip displacement sensors, a lifting oil cylinder and a plurality of supporting legs are arranged on the lower portion of the movable skip, a traction system arranged on the lower portion of the movable skip comprises a tractor, a traction frame, idler wheels and a skip guide rail, the upper portion of the traction frame of the traction system is connected with the lower portion of a skip frame through the lifting oil cylinder, the lifting oil cylinder can drive the movable skip to move up and down, the skip guide rail is fixed on a fixed frame, and the skip displacement sensors are arranged between the movable skip and the fixed frame and used for feeding back displacement information between the movable skip and the fixed frame.
5. An underground engineering three-way loading test method with displacement feedback, which adopts the underground engineering three-way loading test device with displacement feedback of any one of claims 1 to 4, and is characterized by comprising four steps:
the method comprises the following steps that firstly, when a test is prepared, a movable skip car is arranged on the outer side of a fixed frame, and test materials, a pre-buried test model and relevant test sensors are filled in the movable skip car;
secondly, after the movable skip car is pulled to a preset position in the fixed frame through the traction system, the lifting oil cylinder under the movable skip car is shortened, the movable skip car slowly descends, the skip car displacement sensor detects the displacement between the movable skip car and the fixed frame and performs feedback control, the supporting legs are in contact with the fixed frame, the idler wheels are separated from the guide rails, and the load of the movable skip car is transmitted to the fixed frame through the supporting legs;
loading the test material from three directions respectively or simultaneously, feeding back the loading displacement through a loading displacement sensor, recording test data, and resetting a loading device at the top after the loading test is finished;
and fourthly, extending the lifting oil cylinder at the lower part of the movable skip, detecting the displacement between the movable skip and the fixed frame through a skip displacement sensor, performing feedback control until each roller contacts the guide rail and the support leg is separated from the fixed frame, uniformly transmitting the load of the movable skip to the fixed frame through the rollers and the guide rail, pulling the movable skip to the outer side of the fixed frame through a traction system, cleaning the test materials, and preparing for the next test.
6. An underground engineering three-way loading test method with displacement feedback, which is characterized by comprising five steps:
before the four steps of claim 5, adding a preliminary operation step of moving the rear door panel in parallel to a set position using a feedback signal of a rear door displacement sensor, and then performing the four steps of claim 5.
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