Vibration table model box for simulating discontinuous liquefied formation and test method

Abstract

The invention discloses a vibration table model box for simulating a discontinuous liquefied stratum and a test method, the model box comprises a model box body connected to a vibration table, and a sliding system, a drainage system and a partition fixing system which are arranged on the model box body, and the model box body is formed by encircling a plurality of groups of frames and a frame bottom plate; the internal space of the model box body is divided through the horizontal direction and vertical movement of the partition fixing system, the model box body is filled with liquefied soil foundation model materials in a layered mode according to the division position, the position of a discontinuous fault plane can be flexibly controlled, and then a discontinuous liquefied formation test is completed. According to the model box, through the combination of a plurality of groups of frames, a sliding system, a drainage system and an interval fixing system, accurate simulation of a discontinuous liquefied stratum is realized, and the test requirements of an earthquake response test and an anti-liquefaction test of an underground structure under the condition of the discontinuous liquefied stratum can be met; and deep research and understanding of liquefied formation characteristics in scientific research and engineering fields are facilitated.

Description

Technical Field

[0001] The invention belongs to the field of earthquake engineering, and in particular relates to a shaking table model box for simulating discontinuous liquefied strata and a test method. Background Art

[0002] Through the study of the Great Hanshin Earthquake in Japan, it was found that in liquefiable strata, the liquefaction of sand under seismic load has a more serious impact on underground structures. Therefore, the problem of tunnel damage caused by liquefiable sand strata under earthquake action has attracted the attention of extensive scholars.

[0003] At present, there are many research directions on the seismic response of underground structures, and many studies have been conducted at home and abroad. Although there have been many studies on the seismic response of underground structures, most of them are carried out in non-liquefied soil layers, and there are fewer studies on liquefied soil layers, and the research on the seismic response of underground structures in discontinuous liquefied soil layers is even rarer; stress concentration is very likely to occur at the junction of different strata in underground structures, and the influence of the junction of liquefiable strata and non-liquefied strata on underground structures is more important. The influence of liquefied strata on underground structures is mainly manifested in differential settlement, change in structural stress state, and overall floating of the structure, while the influence of non-liquefied strata on underground structures is quite different from that of liquefied strata. Because the damage of underground structures in seismic response is significantly affected by the surrounding soil, it is necessary to conduct a safe quantitative assessment of the influence of discontinuous liquefied strata on the seismic response of underground structures and even the joints of underground structures, so as to provide an indicator basis for the actual engineering application of underground structures in discontinuous liquefiable strata in the future.

[0004] It can be seen that most of the existing simulation methods are aimed at a single soil layer or multiple soil layers, and it is difficult to effectively simulate non-liquefied strata. Summary of the invention

[0005] In order to overcome the above technical defects, the present invention provides a shaking table model box and a test method for simulating non-continuous liquefied strata, so as to solve the technical problem that most of the existing simulation methods are aimed at a single soil layer or multiple soil layers and it is difficult to effectively simulate non-liquefied strata.

[0006] In order to achieve the above object, the present invention adopts the following technical contents: A shaking table model box for simulating discontinuous liquefied formations, comprising a model box body arranged on the shaking table; The model box body comprises a plurality of sets of frames, and the plurality of sets of frames and the frame bottom plate are combined to form a model box body with a top opening and a cubic structure; The model box body is provided with a sliding system, a drainage system and a partition fixing system; The sliding system is arranged between two adjacent groups of frames, and is used to keep the soil layers at the same depth at the same acceleration. The drainage system is arranged on the frame bottom plate and is used to discharge the liquid in the soil layer of the model box body; The partition fixing system is arranged in the model box body and can move horizontally and vertically to divide the internal space of the model box body so that the liquefied soil foundation model material can be layered into the model box body according to the division position during the vibration test to realize the construction of non-continuous liquefied strata.

[0007] Furthermore, the partition fixing system includes a hook-shaped component; one end of the hook-shaped component is hung on the upper edge of the top frame through a groove, and the other end is provided with a sliding buckle; the sliding buckle is fixedly connected to a partition, and the partition is vertically arranged to the bottom plate of the frame; the sliding buckle can slide along the hook-shaped component, driving the partition to move in the vertical direction.

[0008] Furthermore, a through hole is provided on the partition, and a hanging ring is provided in the through hole.

[0009] Furthermore, the sliding system includes slideways opened at the top and bottom of the side edges of the frame; the slideways are located between two adjacent groups of the frames; and the slideways are provided with balls, rollers and damping buffers.

[0010] Furthermore, the inner wall of the model box body is paved with waterproof cloth and polyethylene foam board, which cooperate with the damping buffer to coordinately control the influence of boundary effect on test parameters.

[0011] Furthermore, the drainage system includes a double-layer drainage frame located at the bottom of the model box body, and the double-layer drainage frame is connected to the bottom frame through a sliding system; the inner frame of the double-layer drainage frame is connected to a drainage control switch, and the inner frame and the outer frame are provided with a plurality of drainage holes; the drainage control switch can drive the inner frame to move laterally, so that the drainage holes of the inner frame are aligned with the drainage holes of the outer frame to achieve drainage.

[0012] Furthermore, the inner frame of the double-layer drainage frame is smaller than the outer frame, and the inner frame and the outer frame are connected via a sliding structure.

[0013] Furthermore, the model box body and the vibration table are fixed by a fixing device; the fixing device includes two groups of cross steel plates symmetrically arranged on both sides of the model box body; the tops of the two groups of cross steel plates are connected by a connecting plate.

[0014] Furthermore, a drainage hose is inserted inside the cross steel plate, and the drainage hose is connected to the drainage end of the drainage system.

[0015] A test method for a shaking table model box simulating a discontinuous liquefaction formation, based on the above-mentioned shaking table model box simulating a discontinuous liquefaction formation, comprises: S1: Assemble the model box body, sliding system, drainage system and partition fixing system, and fix the assembled model box on the vibration table; S2: Using the segment fixing system, the liquefied soil foundation model material is layered into the model box body to construct a discontinuous liquefied stratum; during the filling process, the detection element is buried at the preset position; S3: After the construction of the discontinuous liquefied formation is completed, the partition fixing system is removed and the discontinuous liquefied formation shaking table test is carried out.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The invention provides a vibration table model box for simulating non-continuous liquefied strata. The model box comprises a model box body connected to the vibration table and a sliding system, a drainage system and a partition fixing system arranged on the model box body. The model box body is constructed by enclosing a plurality of frames and a frame bottom plate. The internal space of the model box body is divided by the horizontal and vertical movement of the partition fixing system, and the liquefied soil foundation model material is loaded into the model box body in layers according to the divided positions, so that the position of the non-continuous fault surface can be flexibly controlled, thereby completing the non-continuous liquefied stratum test. The model box realizes accurate simulation of the non-continuous liquefied stratum through the combination of the plurality of frames and the sliding system, the drainage system and the partition fixing system, and can meet the test requirements of the seismic response test and the anti-liquefaction test of the underground structure under the condition of the non-continuous liquefied soil layer; and is helpful for the in-depth study and understanding of the characteristics of the liquefied stratum in the scientific research and engineering fields.

[0017] Preferably, in the present invention, the partition fixing system is designed with hook-like components and sliding buckles so that the partitions can move freely in the vertical direction, thereby conveniently adjusting the space divided inside the model box, facilitating layered loading of different materials, and improving the flexibility and accuracy of the test.

[0018] Further preferably, in the present invention, the through holes and the hanging rings provided on the partition facilitate movement of the partition during the test, thereby enhancing the convenience and operability of the test.

[0019] Preferably, in the present invention, the sliding system reduces the friction between frames through the combination of slideways, balls, rollers and damping buffers, ensuring the effective transmission of vibration energy in the soil layer. At the same time, the damping buffer can also reduce the impact of vibration on the boundary of the model box to a certain extent, thereby improving the accuracy and reliability of the test.

[0020] Preferably, in the present invention, the waterproof cloth and polyethylene foam board laid on the inner wall of the model box work together with the damping buffer to effectively control the influence of the boundary effect on the test parameters, ensure the consistency of the acceleration of the soil layer at the same depth, and further improve the accuracy and reliability of the test results.

[0021] Preferably, in the present invention, the drainage system adopts a double-layer drainage frame design, and the inner frame of the double-layer drainage frame is responsible for controlling the experimental drainage conditions; the opening and closing of the drainage holes are controlled by the drainage control switch, thereby achieving precise control of the soil layer liquid in the model box, facilitating the simulation of stratum changes under different liquefaction conditions, and enhancing the flexibility and practicality of the experiment.

[0022] Preferably, in the present invention, the inner frame of the double-layer drainage frame is smaller than the outer frame and is connected by a sliding structure. This design makes the drainage system more compact and easier to operate, while also improving drainage efficiency and accuracy.

[0023] Preferably, in the present invention, the model box body is firmly fixed on the vibration table by a fixing device, thereby ensuring the stability of the model box during the test, preventing the model box from being displaced or damaged due to vibration, and ensuring the smooth progress of the test.

[0024] Preferably, in the present invention, the drainage hose inserted inside the cross steel plates is connected to the drainage system, so as to achieve effective drainage of excess liquid generated during the test, maintain a dry environment in the model box, and avoid the influence of moisture on the test results.

[0025] The present invention also provides a test method for a shaking table model box simulating a non-continuous liquefied stratum. Based on the shaking table model box simulating a non-continuous liquefied stratum, the method provides a systematic and efficient process to simulate a non-continuous liquefied stratum and conduct a shaking table test. The stability and controllability of the test environment are ensured by splicing and fixing the model box and the sliding system, the drainage system, and the partition fixing system. The partition fixing system is used to realize the filling of layered liquefied soil foundation model materials to construct a non-continuous stratum, which not only improves the accuracy of the test, but also allows the detection elements to be buried at preset positions to monitor stratum changes in real time. Finally, the shaking table test is carried out after the partition fixing system is removed, which can truly simulate the response of the non-continuous liquefied stratum under dynamic effects such as earthquakes, and provides valuable experimental data and scientific basis for the prediction, prevention and control of geological disasters and engineering design. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a shaking table model box for simulating discontinuous liquefaction of formations provided in an embodiment of the present invention; Figure 2 A schematic diagram of a sliding system of a shaking table model box simulating discontinuous liquefaction formation provided in an embodiment of the present invention; Figure 3 A schematic diagram of a drainage system of a shaking table model box simulating discontinuous liquefaction of strata provided in an embodiment of the present invention; Figure 4 A schematic diagram of a partition fixing system of a shaking table model box simulating discontinuous liquefaction formation provided in an embodiment of the present invention; Figure 5 A partially enlarged view of a partition fixing system of a shaking table model box simulating discontinuous liquefaction formation provided in an embodiment of the present invention.

[0027] Reference numerals: 1-vibrating table, 2-frame, 3-sliding system, 4-frame bottom plate, 5-drainage system, 6-segment fixing system, 7-partition, 8-fixing device; 31- slideway, 32- ball, 33- roller, 34- damping buffer; 51-drainage control switch, 52-drainage hole, 53-double-layer drainage frame; 61 - hook-shaped member, 62 - sliding buckle, 63 - screw hole, 64 - groove. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail in the following specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, 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 claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does 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 therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Example 1 As mentioned in the background technology, currently, most of the existing simulation methods or model products are for single soil layers or multiple soil layers, and it is difficult to effectively simulate non-liquefied strata, which leads to the inability to reliably study the impact of the interface between liquefiable strata and non-liquefied strata on underground structures. Therefore, it is urgent to develop a shaking table model box for discontinuous liquefied strata and its test method, so as to explore the seismic response of underground structures in discontinuous liquefied strata and avoid more serious damage to underground structures in non-liquefied strata.

[0036] In order to solve the above problems, the present invention provides a shaking table model box and a test method for simulating discontinuous liquefied strata. The present invention provides reasonable physical similarity conditions and easy-to-implement boundary treatment conditions, which can realize the shaking table test of underground structures in discontinuous liquefied strata; the use of this model box can meet the test requirements of the seismic response of underground structures under discontinuous liquefied soil layer conditions.

[0037] The present invention is further described in detail below with reference to the accompanying drawings and embodiments: like Figure 1As shown, in this embodiment, a shaking table model box for simulating non-continuous liquefaction formations is provided, including: a cubic structure with an open top formed by multiple groups of frames 2 and frame bottom plates 4 - a model box body, and a sliding system 3, a drainage system 5 and a partition fixing system 6 arranged on the model box body.

[0038] Among them, the sliding system 3 is arranged between the two adjacent groups of frames 2 above and below, so as to keep the soil layers at the same depth at the same acceleration; the drainage system 5 is arranged on the frame bottom plate 4, so as to discharge the liquid in the soil layer in the model box body; the partition fixing system is arranged in the model box body, so as to divide the internal space of the model box body, so as to load the liquefied soil foundation model material into the model box body in layers according to the dividing position during the vibration test, so as to realize the construction of non-continuous liquefied strata.

[0039] The model box also includes a fixing device 8 for fixing the model box body to the vibration table 1 .

[0040] In this embodiment, the specific structure of a shaking table model box for simulating discontinuous liquefaction formation is as follows: like Figure 1 As shown, the fixing device 8 is arranged on the vibration table 1, and a drainage hose placement space is arranged in the fixing device 8; the drainage hose placement space is a frame space of the fixing device 8 and includes a bottom circular drilled hole; The frame 2 and the frame bottom plate 4 are arranged on the vibration table 1 by bolts; a plurality of sets of frames 2 are stacked and arranged on the frame bottom plate 4 to form a stacked model box body.

[0041] Another example Figure 1 As shown, the drainage system 5 includes a double-layer drainage frame 53; the double-layer drainage frame 53 has the same specifications as the frame 2 components, and one end of the double-layer drainage frame 53 passes through the fixing device 8 through a rubber hose (drainage hose); the double-layer drainage frame 53 is connected to the frame 2 using the same sliding system 3.

[0042] like Figure 2 As shown, the sliding system 3 includes a slide sliding device, a high-strength ball sliding device, a damping buffer 34 and a slide 31; the slide sliding device, the high-strength ball sliding device, and the damping buffer 34 are all buried in the frame 2, and are respectively connected to the adjacent frame 2 through the slide 31; the slide 31 is arranged on the upper and lower sides of the adjacent frame 2 of the model box body.

[0043] like Figure 4 and Figure 5As shown, the partition fixing system 6 includes a hook-shaped member 61, which is preferably a steel plate member; the hook-shaped member 61 is hung upside down on the upper edge of the top frame 2 through a groove 64; the specific position is determined according to the test non-continuous liquefied soil layer working conditions; the end of the hook-shaped member 61 is connected to the partition 7; the partition 7 is fixed to the upper bolt holes on both sides of the partition through the sliding buckle 62 on the hook-shaped member 61.

[0044] Another example Figure 1 As shown, in this embodiment, the model box is a stacked model box with an opening on the top, and the rectangular structure with an opening on the top is made of steel plates.

[0045] In this embodiment, the sliding system is a combination of two sliding devices, wherein the slideway sliding device is a convex sliding slideway, and the sliding device is a rigid roller 33; the high-strength ball sliding device is a circular slideway, and the sliding device is a high-strength ball 32.

[0046] In this embodiment, the damping buffer 34 is a device that uses damping force to control the movement of the model box frame. The damping buffer 34 is assembled from a shell, a cylinder, damping oil and a piston.

[0047] In this embodiment, the partition fixing system 6 adopts a barbed steel structure, and the partition fixing system 6 is hung with the top frame 2 of the model box through the upper groove 64.

[0048] In this embodiment, the partition 7 is preferably a steel structure plate, a circular through hole is provided in the upper section and a lifting ring is placed thereon, so as to facilitate the displacement operation of the partition 7 during the test.

[0049] In this embodiment, the drainage system 5 adopts a double-layer model box frame component, and rubber pads are fixedly arranged on the left and right sides of the inner frame and the outer frame; in addition, the overall size of the inner frame is smaller than the outer frame. In this embodiment, the inner frame is shorter than the outer frame in length by the size of a drainage hole.

[0050] This embodiment also provides a test method for simulating a non-continuous liquefied formation shaking table model box, which specifically includes: S1: Assemble the model box body, sliding system, drainage system and partition fixing system, and fix the assembled model box on the vibration table; S2: Using the segment fixing system, the liquefied soil foundation model material is layered into the model box body to construct a discontinuous liquefied stratum; during the filling process, the detection element is buried at the preset position; S3: After the construction of the discontinuous liquefied formation is completed, the partition fixing system is removed and the discontinuous liquefied formation shaking table test is carried out.

[0051] Example 2 This embodiment also provides another shaking table model box for simulating discontinuous liquefaction of formations, the basic structure of which is the same as that of Embodiment 1, and is optimized and improved on the basis of Embodiment 1.

[0052] In this embodiment, the fixing device 8 is connected to the vibration table 1 by bolts; the fixing device 8 is composed of two sections of rectangular steel plates, which are arranged crosswise; the intersection of the rectangular steel plates of the fixing device 8 is assembled through a notch and fixed by bolt connection.

[0053] In this embodiment, the frame bottom plate 4 of the model box is provided with anchor holes; the anchor holes are used to perform a fixed connection with the anchor holes on the table top of the vibration table 1; and the connection method is bolt connection.

[0054] In this embodiment, the drainage system 5 includes a double-layer drainage frame 53; the movement of the inner frame of the double-layer drainage frame 53 selects the drainage condition, and the drainage hole 52 of the outer frame of the double-layer frame is connected to the drainage hose.

[0055] Here, the drainage system 5 drives the inner frame to move horizontally by operating the drainage control switch 51, so that the drainage holes of the inner frame and the outer frame are aligned, thereby realizing drainage control; the drainage system 5 is connected to a drainage hose for water transportation; the other side of the drainage hose is connected to the hollow part of the fixing device 8 and connected from the hole at the bottom. The drainage hose is made of PVC (polyvinyl chloride); the rubber pad is made of NBR (nitrile rubber).

[0056] The specifications of the inner frame and the outer frame are controlled to be the same, and the inner frame is reduced in size compared to the outer frame; there is a gap between the inner frame and the outer frame; a rubber pad is installed on one side of the gap drainage hole in the double-layer drainage frame 53; circular indentations are made on the upper and lower sides of the gap in the double-layer drainage frame 53, and ball bearings are installed to facilitate relative sliding between the inner frame and the outer frame to ensure the control of the drainage flow.

[0057] In this embodiment, the sliding system is limited by the slideway 31 located on the frame 2 of the model box. The specific limiting function is realized by the position of the three slideways 31 opened on the frame 2, and the position is determined by the position installation of the damping buffer 34 to determine the sliding path of the sliding system.

[0058] In this embodiment, the boundary effect of the model box is controlled by the damping buffer 34 installed on the slide and the waterproof cloth and polyethylene foam board laid on the inner side of the model box. The damping buffer 34 cooperates with the waterproof cloth and the polyethylene foam board to control the boundary effect.

[0059] This embodiment also provides a test method for simulating a non-continuous liquefied formation shaking table model box, which specifically includes: S1. Fix the frame bottom plate 4 on the tabletop of the vibration table 1, and install the frame 2 and the sliding system 3 of the model box on the frame bottom plate 4; install the drainage system 5 in the middle of the bottom and connect the drainage hose; install the fixing device 8, and pass the drainage hose through the inner layer of the fixing device 8 to determine the drainage conditions; here, specifically: the inner layer frame of the double-layer drainage frame 53 is connected to the drainage control switch 51, and the outer layer frame is connected to the drainage hose; the drainage hose is connected to the outside through the fixing device 8 to complete the drainage. Among them, the fixing device 8 completes the fixing of the drainage hose.

[0060] S2. Lay waterproof cloth and polyethylene foam board as boundary material on the inner side of the model box, then select the appropriate location for placing the partition fixing system 6 according to the determined working conditions, and then fix it to the upper edge of the frame 2 through the groove 64 of the partition fixing system 6, and fix the partition 7 through the sliding buckle 62 on the hook-shaped component 61 of the partition fixing system 6. Use the sand filling method in the test plan to fill in layers; after one layer of sand filling is completed, release the sliding buckle 61 of the partition device, and then move the position of the partition 7 through the lifting ring on the partition 7, and then fill the second layer of sand.

[0061] S3. During the laying process of the liquefied soil foundation model material, the detection elements required for measurement, such as stress gauges, are buried at the set positions. After the structural model and the liquefied soil foundation model are laid, the partition fixing system 6 and the partition 7 are removed and left to stand for 24 hours; thereafter, the subsequent anti-liquefaction shaking table test of the underground structure non-continuous liquefied stratum is carried out.

[0062] In summary, the present invention provides a shaking table model box and a test method for simulating discontinuous liquefaction formation, which have the following advantages over existing construction measures: First, it is different from traditional methods such as vibration table tests. Traditional methods mostly focus on single soil layers or multiple soil layers, and rarely conduct vibration table tests on non-continuous soil layers. The present invention is easy to consider complex non-continuous soil layers during the test phase, and the parameters of the measures are finely controllable, ensuring economy when the test conditions are met. Second, drainage control. The drainage system in the present invention fills the gap in the controllable drainage of traditional methods. The impact of the vibration table test is controlled at a lower level through a new drainage device, and at the same time, the drainage of the vibration table test is controlled.

[0063] Third, reduce the boundary effect. For the ideal boundary effect, the acceleration time history of the soil layer at the same depth is completely consistent. The boundary effect of the soil box in the field test often has a certain difference in the point acceleration at the same depth, and this difference is the indicator of the test parameter control. The buffer damper set in the sliding system can effectively control the boundary effect on the test parameter control, thereby reducing the impact of the boundary effect.

[0064] Fourth, it is widely applicable to various working conditions. The adjustable segment fixing system can flexibly control the position of the non-continuous fault surface and provide more angles and directions for the cross-section study of underground structures.

[0065] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes changes, replacements and other implementation methods that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention.

Claims

1. A shaking table model box for simulating discontinuous liquefaction formation, characterized in that: It comprises a model box body arranged on a vibration table (1); The model box body comprises a plurality of sets of frames (2), wherein the plurality of sets of frames (2) and a frame bottom plate (4) together form a model box body with a top opening and a cubic structure; The model box body is provided with a sliding system (3), a drainage system (5) and a partition fixing system (6); The sliding system (3) is arranged between two upper and lower adjacent groups of the frames (2) and is used to maintain the same acceleration in soil layers at the same depth; The drainage system (5) is arranged on the frame bottom plate (4) and is used to discharge the liquid in the soil layer of the model box body; The partition fixing system (6) is arranged in the model box body and can move horizontally and vertically, and is used to divide the internal space of the model box body so that the liquefied soil foundation model material can be layered into the model box body according to the division position during the vibration test, thereby realizing the construction of a discontinuous liquefied stratum.

2. A shaking table model box for simulating discontinuous liquefaction of strata according to claim 1, characterized in that: The partition fixing system (6) comprises a hook-shaped component (61); one end of the hook-shaped component (61) is hung on the upper edge of the top frame (2) through a groove (64), and the other end is provided with a sliding buckle (62); the sliding buckle (62) is fixedly connected to a partition (7), and the partition (7) is arranged vertically with the frame bottom plate (4); the sliding buckle (62) can slide along the hook-shaped component to drive the partition (7) to move in the vertical direction.

3. A shaking table model box for simulating discontinuous liquefaction of strata according to claim 2, characterized in that: The partition plate (7) is provided with a through hole, and a hanging ring is arranged in the through hole.

4. A shaking table model box for simulating discontinuous liquefaction of strata according to claim 1, characterized in that: The sliding system (3) comprises a slideway (31) opened at the top and bottom of the side of the frame (2); the slideway (31) is located between two adjacent groups of the frame (2); the slideway (31) is provided with a ball (32), a roller (33) and a damping buffer (34).

5. A shaking table model box for simulating discontinuous liquefaction of strata according to claim 4, characterized in that: The inner wall of the model box body is paved with waterproof cloth and polyethylene foam board, which cooperate with the damping buffer (34) to coordinately control the influence of boundary effects on test parameters.

6. A shaking table model box for simulating discontinuous liquefaction of strata according to claim 1, characterized in that: The drainage system comprises a double-layer drainage frame (53) located at the bottom of the model box body, the double-layer drainage frame (53) being connected to the bottom frame (2) via a sliding system (3); the inner frame of the double-layer drainage frame (53) is connected to a drainage control switch (51), and the inner frame and the outer frame are provided with a plurality of drainage holes (52); the drainage control switch (51) can drive the inner frame to move laterally, so that the drainage holes (52) of the inner frame are aligned with the drainage holes (52) of the outer frame to achieve drainage.

7. A shaking table model box for simulating discontinuous liquefaction of strata according to claim 6, characterized in that: The inner frame of the double-layer drainage frame (53) is smaller than the outer frame, and the inner frame and the outer frame are connected via a sliding structure.

8. A shaking table model box for simulating discontinuous liquefaction of strata according to claim 1, characterized in that: The model box body and the vibration table (1) are fixed by means of a fixing device (8); the fixing device (8) comprises two groups of cross steel plates symmetrically arranged on both sides of the model box body; the tops of the two groups of cross steel plates are connected by a connecting plate.

9. A shaking table model box for simulating discontinuous liquefaction of strata according to claim 8, characterized in that: A drainage hose is inserted into the cross steel plate, and the drainage hose is connected to the drainage end of the drainage system (5).

10. A test method for simulating a non-continuous liquefied formation shaking table model box, characterized in that: The shaking table model box for simulating discontinuous liquefaction of formations according to any one of claims 1 to 9 comprises: S1: Assembling the model box body, the sliding system (3), the drainage system (5) and the partition fixing system (6), and fixing the assembled model box on the vibration table (1); S2: using the partition fixing system (6), the liquefied soil foundation model material is layered into the model box body to construct a discontinuous liquefied stratum; wherein, during the filling process, the detection element is buried at a preset position; S3: After the discontinuous liquefied formation is constructed, the partition fixing system (6) is removed and a discontinuous liquefied formation shaking table test is performed.

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