Octahedral slope disaster simulation test system and method with variable slope and slope height

Abstract

The application belongs to the technical field of geotechnical kinematic test, and discloses an octahedral slope disaster simulation test system and method with variable slope and slope height, which comprises a device main body, an experimental platform and a device expansion structure. The application is an experimental device fixed on a vibration table test table, and its function is to provide a multi-directional experimental platform for slope disaster simulation experiments. The experimental platform can provide an experimental platform in eight directions. After experimental samples are placed on the experimental platform, different motion characteristics of slope disaster experiments in eight different directions can be studied simultaneously under the action of seismic load. Moreover, the experimental platform can simultaneously realize the adjustment of slope and slope height, so that one machine of the experimental platform can be used for multiple purposes, and the utilization rate of the experimental device is improved. Experimental sliders, piled objects, model boxes and other experimental samples or experimental devices can be placed on the experimental platform in eight different directions according to experimental needs.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of geotechnical kinematic test, and particularly relates to an octahedral slope disaster simulation test system with variable slope and slope height and a method thereof. BACKGROUND

[0002] At present, the geological structure of the western mountainous area in China is complex, active faults are widely distributed, and earthquake disasters occur frequently. As one of the serious secondary disasters of earthquakes, earthquake-induced landslides seriously threaten the safety of people's lives and property. Studies have shown that earthquake-induced landslides often exhibit different stability, damage and movement characteristics in different directions, which is known as the direction effect of landslides. In-depth study of the direction effect of earthquake-induced landslides is conducive to targeted protection of slopes, saving engineering economic costs, and ensuring the safety and reliability of slopes.

[0003] Shaking table test, as an important research method of rock and soil earthquake engineering, is widely used in the field of geotechnical kinematic research. In recent years, the study of the direction effect of earthquake-induced landslides has put forward higher requirements for geotechnical kinematic experimental equipment in terms of multi-direction, large stiffness and adjustability. However, most of the existing slope test tables have only a single slope, which cannot meet the needs of simultaneous multi-directional research. In addition, most of the existing test tables are a whole, and cannot adjust the slope and slope height according to needs. A test table can only correspond to one working condition, which greatly reduces the utilization rate of the device. Therefore, it is of great practical significance and scientific value to develop a geotechnical kinematic characteristic experimental device with multiple directions, variable slope and slope height under earthquake load.

[0004] Through the above analysis, the problems and defects of the prior art are:

[0005] (1) Most of the existing slope test tables have only a single slope, which cannot meet the needs of simultaneous multi-directional research.

[0006] (2) Most of the existing test tables are a whole, and cannot adjust the slope and slope height according to needs. A test table can only correspond to one working condition, which greatly reduces the utilization rate of the device. SUMMARY

[0007] In view of the problems existing in the prior art, the present application provides an octahedral slope disaster simulation test system with variable slope and slope height and a method thereof.

[0008] The present application is realized as follows: an octahedral slope disaster simulation test system with variable slope and slope height comprises a device main body, an experimental platform and a device expansion structure.

[0009] The device body comprises a bottom plate, a liftable top plate and bidirectional threaded columns, the liftable top plate is installed on the upper end of the bottom plate through the bidirectional threaded columns; the bottom plate and the liftable top plate are both regular octagons, and one experimental platform is installed on each side of the outer side of the bottom plate and the liftable top plate;

[0010] The experimental platform comprises an experimental platform plate, a platform plate fixing device, a platform plate rotating shaft and a fixed clamping plate, the lower end of the experimental platform plate is connected with the bottom plate through an expansion connecting assembly, and the upper end of the experimental platform plate is connected with the liftable top plate through the platform plate fixing device;

[0011] The device expansion structure comprises an expansion connecting assembly and an expansion plate, and the expansion plate is connected with the lower end of the experimental platform plate through the expansion connecting assembly.

[0012] Further, the bottom plate is provided with a plurality of positioning holes and connecting holes, the positioning holes and the connecting holes are both screw holes, the positioning holes are used for fixing the device body on a vibration table, and the connecting holes are located at the eight top corners of the bottom plate and are used for connecting the device expansion structure.

[0013] Further, the eight top points of the liftable top plate are fixed on the bidirectional threaded columns through positioning rings and fixed nuts; the surface of the bidirectional threaded column is bidirectional thread, comprising left-handed threads and right-handed threads arranged in intersection; the fixed nuts comprise left-handed fixed nuts and right-handed fixed nuts, and there is one left-handed fixed nut and one right-handed fixed nut above and below the liftable top plate.

[0014] Further, the main body section of the experimental platform plate is trapezoidal, and the bottom part comprises a platform plate rotating cylinder, a plurality of fixed screws are arranged on the platform plate rotating cylinder, and the experimental platform plate is fixed on the platform plate rotating shaft through the fixed screws;

[0015] The platform plate rotating shaft is used for connecting the experimental platform plate and the expansion connecting assembly, and there is one connecting hole at each end of the platform plate rotating shaft, and the connecting hole is used for connecting the platform plate rotating shaft with the rotating shaft positioning table in the expansion connecting assembly.

[0016] Further, the expansion connecting assembly comprises two rotating shaft positioning tables, four positioning plates and six connecting holes, and the six connecting holes are respectively located on the two rotating shaft positioning tables and the four positioning plates.

[0017] Further, the positioning plate comprises two inner positioning plates and two outer positioning plates;

[0018] The inner positioning plate is located on one side of the included angle of 135° of the two rotating shaft positioning tables and is used for connecting the bottom plate or the expansion plate.

[0019] The outer positioning plate is located on one side of the included angle of the two rotating shaft positioning tables, and is used for connecting the expansion plate.

[0020] Further, the platform plate fixing device comprises a fixing shaft, a fixing cylinder, a fixing clamp plate and a fixing hole.

[0021] The fixing shaft is fixedly connected to the positioning ring of the liftable top plate, the inner diameter of the fixing cylinder is slightly larger than the diameter of the fixing shaft, and the outer diameter of the fixing cylinder is equal to the sum of the diameter of the fixing shaft and twice the thickness of the experimental platform plate; two fixing cylinders are sleeved on each fixing shaft and are located on the two sides of the experimental platform plate, and the fixing cylinders can move on the fixing shaft in the axial direction;

[0022] The eight fixing shafts are parallel to the eight edges of the liftable top plate and have a gap with the liftable top plate, and the size of the gap is slightly larger than the thickness of the fixing cylinder;

[0023] The cross section of the fixing clamp plate is rectangular, and the fixing clamp plate is fixedly connected to the fixing cylinder and used for clamping and fixing the experimental platform plate.

[0024] The fixing hole is a screw hole on the fixing cylinder and is located on the opposite side of the fixing plate, and is used for screwing a screw to make the fixing plate clamp the experimental platform plate.

[0025] Further, the cross section of the expansion plate is isosceles trapezoidal, the upper base angle is 112.5°, and the lower base angle is 67.5°; the expansion plate comprises four connecting holes and a plurality of positioning holes, and the four positioning holes are respectively located at the four base angles and are used for connecting the device expansion structure.

[0026] Another object of the present application is to provide an octahedral slope disaster simulation test method with variable slope and slope height, which comprises:

[0027] First, the bottom plate with the bidirectional threaded column is fixed to the vibration table through the positioning hole; a left-handed fixed nut and a right-handed fixed nut are respectively screwed on each bidirectional threaded column, the positioning ring of the liftable top plate is inserted into the bidirectional threaded column, and is moved to the required height; a left-handed fixed nut and a right-handed fixed nut are respectively screwed on each bidirectional threaded column to the positioning ring, and all the fixed nuts are screwed and fixed;

[0028] Eight expansion connecting assemblies are installed on the bottom plate through the connecting holes;

[0029] The platform plate rotating shaft is inserted into the platform plate rotating cylinder at the bottom of the experimental platform plate, the platform plate rotating shaft is placed in the rotating shaft positioning table of the outer expansion plate, and is fixed by a screw;

[0030] Move the two platform plate fixing devices to both sides of the fixed shaft and place the experimental platform plate on the fixed shaft; move the two platform plate fixing devices inward to clamp the experimental platform plate and tighten them with screws through the fixing holes to fix the experimental platform plate; place the experimental slider at the specific position on the experimental platform plate; start the vibration table and conduct an experiment.

[0031] Eight expansion plates are added to the outside of the expansion connection assembly through the connection holes, and the expansion plates are fixed to the vibration table through the positioning holes; eight expansion connection assemblies are added to the outside of the expansion plates through the connection holes.

[0032] Loosen the fixing screws on the platform plate fixing device, the platform plate rotating shaft and the platform plate rotating cylinder, and remove the experimental platform plate;

[0033] Loosen the fixing nut on the double-threaded column, move the liftable top plate to the desired height, and then fix it with the fixing nut;

[0034] Insert the platform plate rotating shaft corresponding to the outer extension connection assembly into the platform plate rotating cylinder at the bottom of the experimental platform plate, place the platform plate rotating shaft into the rotating shaft positioning platform of the outer extension plate, and fix it with screws;

[0035] Move the two platform plate fixing devices to both sides of the fixing shaft and place the experimental platform plate on the fixing shaft; move the two platform plate fixing devices inward to clamp the experimental platform plate and tighten them with screws through the fixing holes to fix the experimental platform plate; place the experimental slider at the specific position on the experimental platform plate.

[0036] When the shaking table is excited, the vibration of the shaking table surface is transmitted to the experimental platform plate, and the experimental slider above it will slide under the action of seismic excitation. By comparing the motion of the experimental slider in eight directions, the influence of seismic loads in different directions on the motion of the experimental slider under the same ground motion is analyzed. By adjusting the slope or slope height of the experimental platform plate, the influence of the slope and slope height of the landslide on the motion of the landslide body is analyzed.

[0037] Furthermore, the slope and height of the experimental platform plate satisfy the formula:

[0038]

[0039]

[0040] in, h represents the slope of the experimental platform plate, and h represents the slope height of the experimental platform plate. 13 The distance 'l' represents the distance from the top surface of the liftable top plate to the top surface of the bottom plate; 'l' represents the shortest distance from the central axis of the bidirectional threaded column to the outer edge of the octagonal bottom plate. 21 l represents the longitudinal length of the experimental platform plate.32 The width of the expansion board, l 311 represents the longitudinal width of the rotating axis positioning stage, and n represents the number of extension plates between the bottom of the experimental platform plate and the bottom plate.

[0041] Based on the above technical solutions and the technical problems solved, please analyze the advantages and positive effects of the technical solution to be protected by this invention from the following aspects:

[0042] First, addressing the technical problems existing in the prior art and the difficulty in solving them, this paper closely analyzes, in conjunction with the technical solution to be protected by this invention and the results and data obtained during the research and development process, how the technical solution of this invention solves the technical problems, and the inventive technical effects brought about by solving these problems. The specific description is as follows:

[0043] This invention provides an experimental platform with eight directions, which can conduct experiments in eight directions simultaneously, providing a faster, more convenient and more effective experimental method for scientific experiments involving multiple directions, such as the study of landslide directional effects.

[0044] This invention allows for changes in the height of the experimental platform by moving the adjustable top plate up and down, and for changes in the slope of the experimental platform by adding or removing the expansion structure of the device. These two changes are independent of each other and can be performed simultaneously, thus enabling simultaneous changes in the slope and height of the experimental platform.

[0045] The present invention can effectively ensure the rigidity and stability of the experimental platform through components such as bidirectional threaded columns, platform plate fixing devices, and fixing screws.

[0046] This invention fully considers the requirements of rock and soil shaking table experiments for multiple directions, slope gradient and slope height, and can simultaneously realize the changes in the slope and slope height of the experimental platform plate.

[0047] Second, considering the technical solution as a whole or from a product perspective, the technical effects and advantages of the technical solution to be protected by this invention are specifically described as follows:

[0048] This invention relates to an experimental device fixed on a shaking table test bench, which provides a multi-directional experimental platform for slope disaster simulation experiments. This platform can provide experimental access in eight directions. After placing the experimental specimen on the platform, under seismic loads, different motion characteristics of slope disaster experiments can be studied simultaneously in eight different directions. Furthermore, the platform can simultaneously adjust the slope and slope height, thus achieving multi-purpose functionality and improving the utilization rate of the experimental device. Experimental specimens or devices such as experimental sliders, stacked structures, and model boxes can be placed on the eight different directional experimental platforms according to experimental needs.

[0049] Third, as the invention of the claim of the creative evidence, also embodied in the following several important aspects:

[0050] (1) The expected income and commercial value of the technical scheme of the present application after transformation are:

[0051] The present application can realize one multi-purpose of the experimental platform, improve the utilization rate of the experimental device, can avoid making multiple experimental platforms, reduce the use of experimental device materials, thereby saving experimental time, saving experimental funds, effectively reducing experimental cost.

[0052] (2) The technical scheme of the present application fills the domestic and foreign industry technology gap:

[0053] At present, the slope disaster experimental platform in domestic and foreign research is mostly single direction and cannot be adjusted; and the existing multi-direction experimental platform is a whole structure, which cannot realize the adjustment of slope or slope height; the existing adjustable experimental platform is a single direction experimental equipment, and most of them can only realize the adjustment of slope, and cannot realize the adjustment of slope and slope height at the same time. The present application fills the gap of the slope disaster multi-direction experimental platform which can realize the adjustment of slope and slope height at the same time.

[0054] (3) The technical scheme of the present application overcomes the technical bias:

[0055] Most of the existing experimental platforms cannot have large stiffness and be adjustable, that is, the experimental platform cannot have certain stability and flexibility at the same time, which is also the main reason why few experimental platforms can be adjusted. By using the methods of bidirectional thread, compression fixing and the like, the present application realizes the adjustment of slope and slope height while having sufficient stiffness, which overcomes the problem to a certain extent. BRIEF DESCRIPTION OF DRAWINGS

[0056] Figure 1 is a structural schematic diagram of an octahedral slope disaster simulation test system with variable slope and slope height provided by the embodiment of the present application;

[0057] Figure 2 is a structural schematic diagram of a liftable top plate provided by the embodiment of the present application;

[0058] Figure 3 is a structural schematic diagram of an experimental platform provided by the embodiment of the present application;

[0059] Figure 4 is a structural schematic diagram of an apparatus expansion structure provided by the embodiment of the present application;

[0060] Figure 5 is a structural schematic diagram of an expansion connecting assembly provided by the embodiment of the present application;

[0061] Figure 6 is a structural schematic diagram of a positioning ring provided by the embodiment of the present application;

[0062] Figure 7 is a structural schematic diagram of a platform plate fixing device provided by an embodiment of the present application;

[0063] Figure 8 is a structural schematic diagram of an extension plate provided by an embodiment of the present application;

[0064] Figure 9 is a structural schematic diagram of a bidirectional threaded column provided by an embodiment of the present application;

[0065] Figure 10 is a displacement diagram of eight-direction experimental sliders in the case of scheme 1 provided by an embodiment of the present application;

[0066] Figure 11 is a displacement diagram of eight-direction experimental sliders in the case of scheme 2 provided by an embodiment of the present application;

[0067] Figure 12 is a displacement diagram of eight-direction experimental sliders in the case of scheme 3 provided by an embodiment of the present application;

[0068] In the figure: 1, device main body; 11, bottom plate; 12, bidirectional threaded column; 121, left-hand thread; 122, right-hand thread; 13, liftable top plate; 131, positioning ring; 14, fixed nut; 141, left-hand fixed nut; 142, right-hand fixed nut; 2, experimental platform; 21, experimental platform plate; 211, platform plate rotating cylinder; 22, platform plate fixing device; 221, fixed shaft; 222, fixed cylinder; 223, fixed clamping plate; 224, fixed hole; 23, fixed screw; 24, platform plate rotating shaft; 3, device extension structure; 31, extension connection assembly; 311, rotating shaft positioning table; 312, positioning plate; 3121, inner positioning plate; 3122, outer positioning plate; 32, extension plate; 4, positioning hole; 5, connecting hole; 6, experimental slider. DETAILED DESCRIPTION

[0069] In order to make the objectives, technical solutions, and advantages of the present application clearer and more comprehensible, the present application is further described in detail below in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0070] I. Explanation of Embodiments. In order to enable those skilled in the art to fully understand how the present application is specifically implemented, this part is an explanation of the embodiments of the technical solutions of the claims.

[0071] As Figures 1-9As shown, the application provides an octahedral slope disaster simulation test system with variable slope and slope height, mainly including device main body 1, experimental platform 2 and device expansion structure 3. The device main body mainly includes bottom plate 11, bidirectional threaded column 12 and liftable top plate 13, the experimental platform mainly includes experimental platform plate 21, platform plate fixing device 22, fixing screw 23 and platform plate rotating shaft 24, and the device expansion structure mainly includes expansion connection assembly 31 and expansion plate 32.

[0072] As shown, Figure 2 The cross section of the bottom plate 11 is a regular octagon, which can provide eight experimental platforms. The bottom plate of the embodiment includes twenty positioning holes 4. The positioning hole 4 is a screw hole, which is used to fix the device main body on the vibration table by screw, so as to ensure that the vibration of the experimental table is synchronized with the vibration of the vibration table. The bottom plate 11 includes sixteen connecting holes 5. The connecting hole 5 is a screw hole, which is located on both sides of the eight corners of the octagon and is used to connect the expansion assembly 31. There are nine bidirectional threaded columns 12, the bottom of which is fixedly connected with the bottom plate, respectively located at the center of the bottom plate and 3 / 5 of the center of the bottom plate and the connecting line of the top point of the octagon, and closer to the top point of the octagon. The cross section of the liftable top plate 13 is a regular octagon, and eight positioning rings 131 are fixedly connected at the eight top points thereof. The liftable top plate 13 is fixed on the bidirectional threaded column 12 by the fixing nut 14. The liftable top plate can move up and down along the axial direction of the bidirectional threaded column 12, so as to realize the height change of the experimental platform plate 21. Figure 9 As shown, Figure 6 The surface of the bidirectional threaded column 12 is bidirectional thread, including left-handed thread 121 and right-handed thread 122. As shown, Figure 6 The fixing nut 14 includes left-handed fixing nut 141 and right-handed fixing nut 142, and there is one left-handed fixing nut 141 and one right-handed fixing nut 142 above and below the liftable top plate 13, that is, there are four fixing nuts 14 on each bidirectional threaded column 12, which are used to fix the liftable top plate 13. When the left-handed fixing nut 141 rotates counterclockwise, it moves downward along the bidirectional threaded column, and when the right-handed fixing nut 142 rotates clockwise, it moves downward along the bidirectional threaded column. The opposite rotation direction can effectively prevent the liftable top plate 13 from moving up and down, so as to ensure that the height of the experimental platform plate 21 does not change during the experiment, and ensure the rigidity and stability of the test table.

[0073] As shown, Figure 3 and Figure 4As shown, the main section shape of the experimental platform plate 21 is trapezoidal, and the bottom includes a platform plate rotating cylinder 211, on which four fixed screws 23 are arranged. After being screwed in and tightened, the fixed screws 23 will squeeze the platform plate rotating shaft 24, thereby fixing the experimental platform plate 21 on the platform plate rotating shaft 24. The experimental platform plate 21 is connected to the bottom plate 11 through the expansion connecting assembly 31 below, and is connected to the liftable top plate 13 through the platform plate fixing device 22 above. The platform plate rotating shaft 24 is used to connect the experimental platform plate 21 and the expansion connecting assembly 31, and each end has a connecting hole 5, connecting the platform plate rotating shaft 24 and the rotating shaft positioning table 311 in the expansion connecting assembly 31. The platform plate fixing device 22 includes a fixed shaft 221, a fixed cylinder 222, a fixed clamping plate 223 and a fixed hole 224. The fixed shaft 221 is fixedly connected to the positioning ring 131 of the liftable top plate 13, and there are eight of them, parallel to the eight edges of the liftable top plate 13, and there is a proper gap between the fixed shaft 221 and the liftable top plate 13, which should be slightly larger than the thickness of the fixed cylinder 222. As shown Figure 7 As shown, the inner diameter of the fixed cylinder 222 is slightly larger than the diameter of the fixed shaft 221, and the outer diameter of the fixed cylinder 222 is equal to the sum of the diameter of the fixed shaft 221 and twice the thickness of the experimental platform plate 21, i.e. the sum of the two. Two fixed cylinders 222 are sleeved on each fixed shaft 221, located on both sides of the experimental platform plate 21. The fixed cylinder 222 can move axially on the fixed shaft 221. The fixed plate is rectangular in section and is fixedly connected to the fixed cylinder 222, used to clamp and fix the experimental platform plate 21. The fixed hole 224 is a screw hole on the fixed cylinder 222, located on the opposite side of the fixed plate, used to screw in the screw to make the fixed plate clamp the experimental platform plate 21. The inner diameter and outer diameter of the fixed cylinder 222 satisfy the formula:

[0074] Wherein, d 222 represents the inner diameter of the fixed cylinder 222, D 221 represents the outer diameter of the fixed cylinder 222, d 221 represents the diameter of the fixed shaft 221, and c 223 represents the thickness of the fixed plate 223.

[0075] As shown Figure 5 The expansion connecting assembly 31 includes two rotating shaft positioning tables 311, four positioning plates 312 and six connecting holes 5, and the six connecting holes 5 are respectively located on the two rotating shaft positioning tables 311 and the four positioning plates 312. Among them, the four positioning plates 312 include two inner positioning plates 312 and two outer positioning plates 312. The inner positioning plate 312 is located on the side of the two rotating shaft positioning tables 311 with an included angle of 135°, used to connect the bottom plate or the expansion plate 32. The outer positioning plate 312 is located on the side of the two rotating shaft positioning tables 311 with an included angle of 225°, used to connect the expansion plate 32. As shown Figure 8As shown, the cross-section of the extension plate 32 is an isosceles trapezoid with an upper base angle of 112.5° and a lower base angle of 67.5°. The extension plate 32 includes four connecting holes 5 and two positioning holes 4. The four positioning holes 4 are located at the four base corners and are used to connect the extension components, allowing the bottom of the experimental platform plate 21 to be moved outwards, thereby changing the slope of the experimental platform plate 21. The two positioning holes 4 are used to fix the extension plate 32 to the vibration table.

[0076] Furthermore, for cases where the bottom of the experimental platform plate 21 needs to be extended outward via the device extension structure 3, i.e., where the slope of the experimental platform plate 21 needs to be changed, the following explanation is provided: Figure 1 , Figure 3 and Figure 4 As shown, in Figure 1 Based on the assembly, the following operations are required. First, eight expansion connection components 31 are added to the outside of the expansion plate 32 through the connection hole 5, and the expansion plate 32 is fixed to the vibration table through the positioning hole 4. Next, loosen the fixing screws 23, the fixing screws on the platform plate fixing device 22 and the platform plate rotating shaft 24, and remove the experimental platform plate 21. Next, insert the platform plate rotating shaft 24 corresponding to the outer expansion connection component 31 into the platform plate rotating cylinder 211 at the bottom of the experimental platform plate 21. Next, place the platform plate rotating shaft 24 into the rotating shaft positioning table 311 of the outer expansion plate 32 and fix it with screws. Next, move the two platform plate fixing devices 22 to both sides of the fixing shaft 221. Next, place the experimental platform plate 21 on the fixing shaft 221. Next, move the two platform plate fixing devices 22 inwards to clamp the experimental platform plate 21, and screw them in through the fixing hole 224 to tighten and fix the experimental platform plate. The slope and height of the experimental platform plate satisfy the formula:

[0077]

[0078]

[0079] in, h represents the slope of experimental platform plate 21, and h represents the slope height of experimental platform plate 21. 13 The distance between the top surface of the liftable top plate 13 and the top surface of the bottom plate 11 is represented by l, where l represents the shortest distance from the central axis of the bidirectional threaded column to the outer edge of the octagonal bottom plate 11. 21 l represents the longitudinal length of the experimental platform plate 21. 32 The width of expansion board 32 is represented by l. 311 The vertical width of the rotating axis positioning stage 311 is represented by n, and the number of extension plates 32 between the bottom of the experimental platform plate 21 and the bottom plate 11 (including the extension plates connected to the bottom of the experimental platform plate) is represented by n.

[0080] When the vibration table is excited, the vibration of the vibration table surface is transmitted to the experimental platform plate 21, and the experimental slider 6 above the experimental platform plate 21 slides under the action of the earthquake excitation. By comparing the motion of the experimental slider in eight directions, the influence of different directions of the earthquake on the motion of the experimental slider under the action of the same earthquake can be analyzed, that is, the direction effect of the earthquake landslide is studied. By adjusting the slope or slope height of the experimental platform plate 21, the influence of the slope and slope height of the landslide on the motion of the landslide body can be studied.

[0081] II. Application Examples. In order to prove the creativity and technical value of the technical solutions of the present application, this part is an application example of the technical solutions of the claims on specific products or related technologies.

[0082] The vibration table experimental equipment installed with the octahedral slope disaster simulation test system with variable slope and slope height in the embodiment of the present application.

[0083] Example 1: (the slope height is unchanged, and the slope is changed)

[0084] The sizes of some test system components and the sizes of the experimental sliders in this embodiment are shown in Table 1, wherein the thicknesses of the bottom plate 11, the liftable top plate 13, the positioning plate 312, and the extension plate 32 are all 10 mm, and the thickness of the experimental platform plate 21 is 8 mm.

[0085] In this embodiment, the experimental platform plate is made of aluminum alloy steel plate, the experimental slider 6 is made of C30 concrete, and the friction angle between the experimental platform plate and the experimental slider is 34.1°.

[0086] In this embodiment, the earthquake motion is selected from the earthquake motion record of the Qingping 51MZQ table in the 2008 Wenchuan earthquake, and the earthquake motion in three directions is input into the present slope disaster simulation test system along the true direction.

[0087] The experimental scheme selected in this embodiment is shown in Table 3.

[0088] Step 1: Assemble the device main body and fix it on the vibration table through a plurality of fixing holes;

[0089] Step 2: Install eight extension connection components on the outside of the bottom plate through the connecting holes;

[0090] Step 3: Loosen the fixing nuts on the two-way threads, move the liftable top plate up and down to a height of 1.15 m, and fix it with the fixing nuts;

[0091] Step 4: Insert the platform plate rotating shaft corresponding to the outside extension connection component into the platform plate rotating cylinder at the bottom of the experimental platform plate, put the platform plate rotating shaft into the rotating shaft positioning table of the outside extension plate, and fix it with a screw;

[0092] Step 5: Move the two platform plate fixing devices to the two sides of the fixing shaft respectively, and place the experimental platform plate on the fixing shaft; move the two platform plate fixing devices to the inner side respectively to clamp the experimental platform plate, and screw the fixing holes with screws to tighten, so as to fix the experimental platform plate; screw the fixing screws on the platform plate rotating cylinder to tighten;

[0093] Step 6: Place eight experimental sliders on the eight experimental platform plates respectively, and at the center of the line connecting the platform plate fixing devices; start the vibration table, input the seismic motion, and record the movement distance of each experimental slider with time; the movement of the experimental sliders is shown in Figure 10 ;

[0094] Step 7: Install eight extension plates outside the extension connecting assembly through the connecting holes, and fix the extension plates on the vibration table through the positioning holes; install eight extension connecting assemblies outside the extension plates through the connecting holes;

[0095] Step 8: Loosen the fixing screws on the platform plate fixing device, platform plate rotating shaft and platform plate rotating cylinder, and remove the experimental platform plate;

[0096] Step 9: Repeat steps 4 and 5 to install the experimental platform on the device, wherein the bottom of the experimental platform is connected to the outermost extension connecting assembly.

[0097] Step 10: Repeat step 6 to obtain the movement of the eight experimental sliders as shown in Figure 11 .

[0098] Figure 10 The acquisition schemes of Figure 11 correspond to scheme 1 and scheme 2 in table 2 respectively, and the comparison of the results of the two schemes can analyze the effect of slope on the direction of earthquake landslide.

[0099] Example two: (the slope is unchanged, and the slope height is changed)

[0100] This example is implemented on the basis of example one, and the experimental components, experimental materials and input seismic motion are the same as those of example one.

[0101] Step 11: Repeat step 8 to remove the experimental platform plate;

[0102] Step 12: Loosen the fixing nuts on the bidirectional screws, move the liftable top plate upward to a height of 1.42m, and fix it with the fixing nuts;

[0103] Step 13: Repeat steps 9 and 10 to obtain the movement of the experimental sliders as shown in Figure 12 .

[0104] Figure 12 The acquisition scheme of Figure 10The experimental results of the two examples can be compared to analyze the effect of slope height on the direction of earthquake-induced landslide.

[0105] III. Evidence of the effects of the embodiments. The embodiments of the present application have achieved some positive effects during the development or use process, and indeed have great advantages compared with the prior art. The following content is described in combination with the data and graphs of the test process.

[0106] In the experimental results of Example 1 and Example 2, E, NE, N, NW, W, SW, S, and SE represent the eight directions of east, northeast, north, northwest, west, southwest, south, and southeast, respectively.

[0107] The slope and slope height of the experimental platform plate can be calculated by the following formula, and the calculation results are shown in Table 2.

[0108]

[0109]

[0110] Table 1: Part of the test system components and experimental slider size table

[0111]

[0112] Table 2: Experimental scheme table of Example 1 and Example 2

[0113] Scheme Liftable roof height / m Number of expansion plates / piece Slope height / m Slope / ° 1 1.15 0 1.15 30 2 1.15 1 1.15 25 3 1.42 1 1.42 30

[0114] Table 3: Final displacement table of experimental sliders in eight directions under the above three schemes (unit: m)

[0115] Scheme S SE E NE N NW W SW 1 1.02 1.66 1.59 1.01 1.36 1.86 1.51 0.86 2 0.16 0.29 0.32 0.33 0.46 0.58 0.42 0.20 3 0.98 1.60 1.52 0.99 1.32 1.80 1.46 0.81

[0116] The final displacement of experimental sliders in eight directions under the above three schemes is shown in Table 3. By comparing and analyzing the above results, it can be found that under the same earthquake action, the movement displacement of experimental sliders in different directions has a large difference, which confirms the existence of the direction effect of earthquake-induced landslide.

[0117] By comparing Scheme 1 and Scheme 2, it can be found that the slope of the landslide has a greater effect on the displacement of the experimental slider, and reducing the slope of the landslide can effectively reduce the movement displacement of the experimental slider. In addition, with the change of the slope of the landslide, some directions with relatively large sliding displacement become smaller (such as S and SE directions), while some directions with relatively small sliding displacement become larger (such as N and SW directions), which shows that the slope of the landslide has a certain influence on the direction effect of the landslide, i.e. the change of the slope of the landslide may lead to the change of the dominant sliding direction of the landslide.

[0118] Comparing scheme 1 and scheme 3, it can be found that when the slope height increases by 23.5%, the final displacement of the eight-direction experimental slider is slightly reduced, but the reduction is not more than 5%; it can be seen that the slope height of the landslide has little effect on the displacement of the experimental slider; and the slope height of the landslide also has little effect on the direction effect of the landslide.

[0119] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0120] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any modification, equivalent replacement and improvement made by any person skilled in the art within the technical range disclosed by the present application, as long as it is within the spirit and principle of the present application, should be covered within the protection scope of the present application.

Claims

1. A variable gradient and height octahedral slope disaster simulation test system, characterized in that, The variable gradient and slope height octahedral slope disaster simulation test system comprises a device main body, an experimental platform and a device expansion structure; The device main body comprises a bottom plate, a liftable top plate and bidirectional threaded columns, the liftable top plate is installed on the upper end of the bottom plate through the bidirectional threaded columns, the bottom plate and the liftable top plate are regular octagons, and one experimental platform is installed on each side of the bottom plate and the liftable top plate; The experimental platform comprises an experimental platform plate, a platform plate fixing device, a platform plate rotating shaft and a fixed clamping plate, the lower end of the experimental platform plate is connected with the bottom plate through an expansion connecting assembly, and the upper end of the experimental platform plate is connected with the liftable top plate through the platform plate fixing device; The device expansion structure comprises an expansion connecting assembly and an expansion plate, and the expansion plate is connected with the lower end of the experimental platform plate through the expansion connecting assembly; The eight vertexes of the liftable top plate are fixed on the bidirectional threaded columns through positioning rings and fixed nuts, the surface of the bidirectional threaded column is bidirectional thread, and the bidirectional thread comprises left-handed threads and right-handed threads arranged in intersection, and the fixed nuts comprise left-handed fixed nuts and right-handed fixed nuts, and there is one left-handed fixed nut and one right-handed fixed nut above and below the liftable top plate; The expansion connecting assembly comprises two rotating shaft positioning tables, four positioning plates and six connecting holes, and the six connecting holes are respectively arranged on the two rotating shaft positioning tables and the four positioning plates; The platform plate fixing device comprises a fixed shaft, a fixed cylinder, a fixed clamping plate and a fixed hole; The fixed shaft is fixedly connected on the positioning ring of the liftable top plate, the inner diameter of the fixed cylinder is larger than the diameter of the fixed shaft, and the outer diameter of the fixed cylinder is equal to the sum of the diameter of the fixed shaft and twice the thickness of the experimental platform plate, two fixed cylinders are sleeved on each fixed shaft and are arranged on the two sides of the experimental platform plate, and the fixed cylinder can move on the fixed shaft in the axial direction; There are eight fixed shafts, and the eight fixed shafts are parallel to the eight edges of the liftable top plate and have a gap between the fixed shafts and the liftable top plate, and the size of the gap is greater than the thickness of the fixed cylinder; The fixed clamping plate is in the shape of a rectangle in cross section, is fixedly connected on the fixed cylinder and is used for clamping and fixing the experimental platform plate; The fixed hole is a screw hole on the fixed cylinder and is arranged on the opposite side of the fixed plate and is used for screwing a screw to make the fixed plate clamp the experimental platform plate.

2. The variable slope and height octahedral slope disaster simulation test system according to claim 1, wherein, The bottom plate is provided with a plurality of positioning holes and connecting holes, the positioning holes and the connecting holes are screw holes, the positioning holes are used for fixing the device main body on a vibration table, and the connecting holes are arranged at the eight top corners of the bottom plate and are used for connecting the device expansion structure.

3. The variable gradient and height octahedral slope disaster simulation test system according to claim 1, wherein, The main body of the experimental platform plate is in the shape of a trapezoid in cross section, the bottom part comprises a platform plate rotating cylinder, a plurality of fixed screws are arranged on the platform plate rotating cylinder and are used for fixing the experimental platform plate on the platform plate rotating shaft; The platform plate rotating shaft is used for connecting the experimental platform plate and the expansion connecting assembly, each end of the platform plate rotating shaft is provided with a connecting hole, and the connecting hole is used for connecting the platform plate rotating shaft with the rotating shaft positioning table in the expansion connecting assembly.

4. The variable slope and height octahedral slope disaster simulation test system according to claim 1, wherein The positioning plate comprises two inner positioning plates and two outer positioning plates. The inner positioning plate is located on one side of the two rotating shaft positioning tables with an included angle of 135°, and is used for connecting the bottom plate or the extension plate. The outer positioning plate is located on one side of the two rotating shaft positioning tables with an included angle of 225°, and is used for connecting the extension plate.

5. The variable slope and height octahedral slope disaster simulation test system according to claim 1, wherein The cross section of the extension plate is isosceles trapezoidal, with an upper base angle of 112.5° and a lower base angle of 67.5°; the extension plate comprises four connecting holes and a plurality of positioning holes, and the four positioning holes are respectively located at the four base angles and are used for connecting the device extension structure.

6. A method for conducting the variable gradient and height octahedral slope disaster simulation test system according to any one of claims 1 to 5, characterized by, The variable gradient and slope height octahedral slope disaster simulation test method comprises: First, the bottom plate with a double-threaded column is fixed to the shaking table through the positioning hole; a left-handed fixed nut and a right-handed fixed nut are respectively screwed on each double-threaded column, the positioning ring of the liftable top plate is inserted into the double-threaded column and moved to the required height; a left-handed fixed nut and a right-handed fixed nut are respectively screwed on each double-threaded column to the positioning ring, and all the fixed nuts are screwed tightly; Eight extension connecting assemblies are installed on the bottom plate through the connecting holes; The platform plate rotating shaft is inserted into the platform plate rotating cylinder at the bottom of the experimental platform plate, and the platform plate rotating shaft is placed in the rotating shaft positioning table of the outer extension plate and fixed with a screw; The two platform plate fixing devices are respectively moved to the two sides of the fixed shaft, and the experimental platform plate is placed on the fixed shaft; the two platform plate fixing devices are respectively moved to the inside to clamp the experimental platform plate, and the experimental platform plate is fixed by screwing the fixed holes with screws; the experimental slider is placed at a specific position of the experimental platform plate; the shaking table is started, and a test is performed; Eight extension plates are additionally installed outside the extension connecting assemblies through the connecting holes, and the extension plates are fixed on the shaking table through the positioning holes; eight extension connecting assemblies are additionally installed outside the extension plates through the connecting holes; The fixed screws on the platform plate fixing device, the platform plate rotating shaft and the platform plate rotating cylinder are loosened, and the experimental platform plate is removed; The fixed nuts on the double-threaded column are loosened, and the liftable top plate is moved to the required height and fixed with the fixed nuts; The platform plate rotating shaft corresponding to the outer extension connecting assembly is inserted into the platform plate rotating cylinder at the bottom of the experimental platform plate, and the platform plate rotating shaft is placed in the rotating shaft positioning table of the outer extension plate and fixed with a screw; The two platform plate fixing devices are respectively moved to the two sides of the fixed shaft, and the experimental platform plate is placed on the fixed shaft; the two platform plate fixing devices are respectively moved to the inside to clamp the experimental platform plate, and the experimental platform plate is fixed by screwing the fixed holes with screws; the experimental slider is placed at a specific position of the experimental platform plate; When the shaking table is excited, the vibration of the shaking table surface will be transmitted to the experimental platform plate, and the experimental slider above the experimental platform plate will slide under the action of the earthquake excitation; by comparing the motion of the experimental sliders in eight directions, the influence of different direction seismic loads on the motion of the experimental sliders under the same earthquake excitation is analyzed, and by adjusting the gradient or slope height of the experimental platform plate, the influence of the gradient and slope height of the landslide on the motion of the landslide body is analyzed.

7. The variable gradient and peak height octahedral slope disaster simulation test method according to claim 6, wherein The gradient and slope height of the experimental platform plate satisfy the formula: wherein, represents the slope of the experimental platform plate, h represents the slope height of the experimental platform plate, h 13 represents the distance from the upper top surface of the liftable top plate to the upper top surface of the bottom plate, l represents the shortest distance from the axis of the two-way threaded column to the outer edge line of the octagonal bottom plate, l 21 represents the longitudinal length of the experimental platform plate, l 32 represents the width of the extension plate, l 311 represents the longitudinal width of the rotating shaft positioning table, n represents the number of extension plates between the bottom of the experimental platform plate and the bottom plate.

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