A test device and method for studying a non-plate-shared rail co-construction tunnel model

Abstract

A kind of experimental device and method for studying tunnel model of not common plate public rail co-construction, the device includes model box (100), model soil (17), upper tunnel simulation piece (6), lower tunnel simulation piece (7), upper and lower tunnel filling material (16) and plugboard (200). Multiple layers of jack are provided on the model box, and the jack is inserted with the plugboard. Upper tunnel simulation piece (6) is arranged on the jack; lower tunnel simulation piece (7) is arranged below the jack. The method simulates different working conditions (different spacing, different filling materials) of not common plate public rail co-construction tunnel by using the device. The spacing between the upper and lower tunnels involved in the present application can be combined with the actual situation on site, the simulated working condition is more realistic, and more reliable test data can be obtained. The model test box designed in the present application can be suitable for public rail co-construction tunnel simulation pieces of different shapes, and has wide applicability.

Description

Technical Field

[0001] The invention relates to a test device and method for studying a road-rail co-constructed tunnel model without sharing a common slab, and belongs to the technical field of tunnel model testing. Background Art

[0002] To scientifically and rationally develop and utilize urban underground space resources, promote efficient and intensive land use, and enhance urban carrying capacity, many cities across China have begun constructing a new type of tunnel: co-construction of road and rail. Co-construction of road and rail tunnels involves the simultaneous construction of both a highway tunnel and a subway tunnel. This avoids secondary surface excavation and, to a certain extent, ensures a rational layout of the underground space. However, the stress and deformation mechanisms of this tunnel type require extensive scientific research, and tunnel model testing is a key method for conducting such research.

[0003] Currently, no reports have examined the spacing between the upper and lower tunnel layers and the infill materials used in model tests of co-constructed road and rail tunnels without shared slabs. Furthermore, due to the presence of two tunnel layers, model tests often require multiple excavations of the model soil, increasing the workload and time cost. Summary of the Invention

[0004] The purpose of the present invention is to propose a test device and method for studying the model of a road-rail co-construction tunnel without a shared slab in order to study the spacing between the upper and lower tunnel layers and the filling material in the tunnel and avoid multiple excavations of the model soil.

[0005] The technical solution for implementing the present invention is as follows: a test device for studying a co-constructed tunnel model for road and rail without a shared slab, comprising a model box, model soil, an upper tunnel simulator, a lower tunnel simulator, filling material, and an insert plate. The model box is a rectangular vertical box, comprising a box frame and an upper cover. Sockets No. 1, No. 2, No. 3, and No. 4 are arranged horizontally in the middle of the box frame, from top to bottom, with No. 5 located above the bottom of the model box. The upper tunnel simulator is located above No. 1; the lower tunnel simulator is located in the space below No. 4 and above No. 5. The space surrounding the upper and lower tunnel simulators is filled with model soil. All the sockets can be inserted into the insert plate and are equipped with tightly closed covers to prevent leakage of model soil. A movable door handle is installed in the middle of the outer side of the cover.

[0006] The lower parts of the left and right side walls of the model box are equipped with faucets for drainage.

[0007] The upper tunnel simulation parts and the lower tunnel simulation parts are distributed in the horizontal direction, that is, the vertical direction perpendicular to the box frame, and are respectively provided with the outline of the tunnel.

[0008] The front wall of the model box is made of high-strength tempered glass, which is convenient for directly observing the internal situation of the model box.

[0009] After the plug board is inserted into the socket, both ends of the plug board can be fixed with bolts to prevent the plug board from slipping.

[0010] The number one socket, number two socket, number three socket, number four socket and number five socket are equally spaced, and the layer heights are h .

[0011] Four openable and closable movable doors are provided on the rear side wall of the box frame between the No. 1 and No. 2 sockets, the No. 2 and No. 3 sockets, the No. 3 and No. 4 sockets, and the No. 5 socket and the bottom plate, and can be used to remove and add filling materials.

[0012] The inserting plate is made of a high-strength thin steel plate to prevent the model soil from collapsing due to insufficient load-bearing capacity; the inserting plate into and removing the inserting plate from the inserting hole will not cause dislocation of the model soil material.

[0013] The filling material in the hole between the upper tunnel simulation part and the lower tunnel simulation part is used to simulate the filling material between the upper tunnel and the lower tunnel of the road-rail co-construction tunnel; the filling material is selected according to research needs, including sand with different densities and concrete materials with different strengths.

[0014] An experimental method for studying a road-rail co-construction tunnel model without a shared slab, comprising the following steps:

[0015] (1) Determine the size of the test device, the distance between the sockets, and the type of filling material according to the test requirements;

[0016] (2) Use a marker to mark the specific location of the lower tunnel simulation component on the inner wall of the model box, and ensure that the No. 2 socket is located directly above the lower tunnel simulation component;

[0017] (3) Fill the model box with model soil, place the lower tunnel simulation piece according to the position of the marker pen, and insert the plug board into the No. 2 socket;

[0018] (4) Fill the space between the No. 1 and No. 2 sockets with filling material, insert the plug plate into the No. 1 socket, place the upper tunnel simulation on it, fill the model soil and compact it, and then completely pull out the plug plate. The data of the upper and lower tunnel simulations at the first spacing can be measured;

[0019] (5) Insert the plug-in plates into the No. 1 and No. 5 plug-in holes respectively, remove the model soil between the No. 5 plug-in hole and the bottom plate, let the lower tunnel simulation piece and the model soil fall freely, then insert the plug-in plate into the No. 3 plug-in hole, fill the space between the No. 2 and No. 3 plug-in holes with the same filling material, and remove all the plug-in plates. At this time, the data of the upper and lower tunnel simulation pieces at the second spacing can be measured;

[0020] (6) Fill the space between the No. 3 and No. 4 plug holes with the same filling material in the same way, and remove all the plug plates. At this time, the data of the upper and lower tunnel simulation pieces at the third spacing can be measured.

[0021] The data referred to herein refers to the data required for the research purpose, including the strain and displacement of the upper tunnel floor and roof, and the strain and displacement of the lower tunnel roof; the strain data is measured by a resistance strain sensor, and the displacement data is measured using a displacement meter, a dial indicator, and a micrometer.

[0022] Under the condition of the same spacing, the filling materials between the upper and lower tunnel simulation parts can be changed by using the movable door between every two adjacent sockets from socket No. 1 to socket No. 4.

[0023] The beneficial effects of the present invention are that the present invention can simulate different working conditions (different spacings, different filling materials) of road-rail co-construction tunnels without sharing a common slab using the same model test device, which is easy to operate and saves time and effort; the spacing between the upper and lower tunnels involved in the present invention can be combined with the actual situation on site, the simulated working conditions are more realistic, and more reliable test data can be obtained; the model test box designed by the present invention can be applied to road-rail co-construction tunnel simulation parts of different shapes, and has a wide applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the model test device for studying the co-construction of road and rail tunnels without shared slabs;

[0025] Figure 2 yes Figure 1 Side view of the model box;

[0026] Figure 3 yes Figure 1 Top view of the model box;

[0027] Figure 4 It is a schematic diagram of the plugboard;

[0028] Figure 5 This is a schematic diagram of the model experimental device after the test is completed;

[0029] In the figure, 1 is a first jack; 2 is a second jack; 3 is a third jack; 4 is a fourth jack; 5 is a fifth jack; 6 is an upper tunnel simulation piece; 7 is a lower tunnel simulation piece; 8 is a movable door handle; 9 is a model frame; 10 is a left side wall; 11 is a right side wall; 12 is a bottom wall; 13 is a front wall; 14 is a back wall; 15 is a bolt hole; 16 is a filling material; 17 is model soil; 18 is a drain faucet; 100 is a model box; and 200 is a plugboard. DETAILED DESCRIPTION

[0030] In the embodiment, a test device for studying a tunnel model of a non-shared-plate public rail co-construction is as shown in the figure, and the test device comprises a model box 100 and a plugboard 200. Figure 1

[0031] As shown in the figure, in the embodiment, the model box 100 comprises a model frame 9, a left side wall 10, a right side wall 11, a bottom wall 12, a front wall 13, a back wall 14, an upper tunnel simulation piece 6 and a lower tunnel simulation piece 7. The surfaces of the model box are made of transparent tempered glass, so that the inside of the model box and the deformation of the tunnel can be observed. Figure 1-5

[0032] On the left side wall 10 and the right side wall 11, there are a first jack 1, a second jack 2, a third jack 3, a fourth jack 4 and a fifth jack 5, which are used for placing the plugboard 200.

[0033] On the front wall, between the first jack 1 and the second jack 2, between the second jack 2 and the third jack 3, between the third jack 3 and the fourth jack 4, and between the fifth jack 5 and the bottom wall 13, there are movable doors, and the movable doors are provided with handles 8.

[0034] The distances between the first jack 1 and the second jack 2, between the second jack 2 and the third jack 3, between the third jack 3 and the fourth jack 4, and between the fifth jack 5 and the bottom wall 13 are the same.

[0035] The plugboard 200 is provided with bolt holes 15 for fixing positions. Between the upper tunnel simulation piece 6 and the lower tunnel simulation piece 7, there is a filling material 16, and the remaining space is filled with model soil 17, which can be determined according to the test. On the left side wall 10 and the right side wall 11, there are faucets 18 that can be used for drainage, which are used for simulating underground water.

[0036] In actual projects, the distances between the upper and lower tunnels may have multiple different working conditions. Therefore, the number of jacks mentioned in the present application can be adjusted accordingly.

[0037] The following are specific implementation steps of the embodiment:

[0038] (1) The size of the test device, the distance h between the jacks and the type of the filling material are determined according to the test requirements; ​​

[0039] (2) Use a marker to mark the specific location of the lower tunnel simulation piece on the inner wall of the model box, and ensure that the second socket 2 is located directly above the lower tunnel simulation piece 7;

[0040] (3) Fill the model box with model soil 17, place the lower tunnel simulation piece 7 according to the position of the marker pen, and insert the plug board into the No. 2 socket 2;

[0041] (4) Fill the space between the No. 1 and No. 2 sockets with filling material 16, insert the plug plate into the No. 1 socket, place the upper tunnel simulation piece on it, fill it with model soil 17 and compact it, and then pull out the plug plate completely. The data of the upper and lower tunnel simulation pieces at the first spacing can be measured.

[0042] (5) Insert the plugs into the No. 1 and No. 5 sockets, respectively, and remove the model soil 17 between the No. 5 socket 1 and the bottom plate 13. Then pull out the No. 5 plug 5, and let the lower tunnel simulation 7 and the model soil fall freely. Then insert the plug into the No. 3 socket 3, and fill the space between the No. 2 and No. 3 sockets with the same filling material 16. Pull out all the plugs. At this time, the data of the upper and lower tunnel simulations at the second spacing can be measured.

[0043] (6) Using the same method, fill the space between the third and fourth plug holes 3 and 4 with the same filling material 16, and remove all the plug plates. At this time, the data of the upper and lower tunnel simulation pieces at the third spacing can be measured.

[0044] In this embodiment, in step (4), the movable door between the first socket 1 and the second socket 2 can be used to change different filling materials. Similarly, in step (5), the movable door between the second socket 2 and the third socket 3 can be used to change different filling materials. In this way, the effects of different filling materials under the same spacing conditions can be studied.

[0045] The above is merely an embodiment of the present application and does not limit the present application. A person skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be within the scope of protection of the present application.

Claims

1. A test method for studying a road-rail co-construction tunnel model using a test device, characterized by: The test device includes a model box, model soil, an upper tunnel simulation piece, a lower tunnel simulation piece, filling materials in the upper and lower tunnels, and an insert plate; the model box is a rectangular vertical box body, including a box frame; a number 1, a number 2, a number 3, and a number 4 are continuously provided at a horizontal position in the middle of the box frame from top to bottom, and the number 5 is provided on the bottom of the model box, and the jacks are separated by a box partition plate above and below; the upper tunnel simulation piece is provided above the number 1 jack; the lower tunnel simulation piece is provided in the space below the number 4 jack and above the number 5 jack; the space around the upper tunnel simulation piece and the lower tunnel simulation piece is filled with model soil; all the jacks can be inserted with an insert plate, and each jack is provided with a plug cover that is the same size as the jack and can be tightly closed to prevent the model soil from leaking from the jack; Four openable and closable movable doors are provided on the rear side wall of the box frame between the No. 1 and No. 2 sockets, the No. 2 and No. 3 sockets, the No. 3 and No. 4 sockets, and the No. 5 socket and the bottom plate, for removing or adding model soil materials; The method steps are as follows: (1) Determine the size of the test device, the distance between the sockets, and the type of filling material according to the test requirements; (2) Use a marker to mark the specific location of the lower tunnel simulation component on the inner wall of the model box, and ensure that the No. 2 socket is located directly above the lower tunnel simulation component; (3) Fill the model box with model soil, place the lower tunnel simulation piece according to the position of the marker pen, and insert the plug board into the No. 2 socket; (4) Fill the space between the No. 1 and No. 2 sockets with filling material, insert the plug plate into the No. 1 socket, place the upper tunnel simulation on it, fill it with model soil and compact it, remove the plug plate completely, and measure the data of the upper and lower tunnel simulations at the first spacing; (5) Insert the plug-in plates into the No. 1 and No. 5 plug-in holes respectively, remove the model soil between the No. 5 plug-in hole and the bottom wall, let the lower tunnel simulation piece and the model soil fall freely, then insert the plug-in plate into the No. 3 plug-in hole, fill the space between the No. 2 and No. 3 plug-in holes with the same filling material, remove all the plug-in plates, and measure the data of the upper and lower tunnel simulation pieces at the second spacing; (6) Fill the space between the No. 3 and No. 4 plug holes with the same filling material in the same way, remove all the plug plates, and measure the data of the upper and lower tunnel simulation pieces at the third spacing; In step (4), the movable door between the No. 1 socket (1) and the No. 2 socket (2) is used to change different filling materials. Similarly, in step (5), the movable door between the No. 2 socket (2) and the No. 3 socket (3) is used to change different filling materials. The effects of different filling materials under the same spacing conditions are studied.

2. The test method according to claim 1, characterized in that: The data referred to herein refers to the data required for the research purpose, including the strain and displacement of the upper tunnel floor and roof, and the strain and displacement of the lower tunnel roof; the strain data is measured by a resistance strain sensor, and the displacement data is measured using a displacement meter, a dial indicator, and a micrometer.

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