Stratum controlled deformation model test device for round section excavation

Abstract

The utility model provides a stratum controlled deformation model test device for excavation of a circular section, which relates to the technical field of tunnels and comprises a plurality of prefabricated layers, model segments and a model box. Each prefabricated layer is of a cylindrical structure defined by an even number of arc-shaped prefabricated sheets with the same shape and size; and the diameters of the multiple prefabricated layers are just matched with one another in a sleeving manner. The model duct piece is arranged in the prefabricated layer on the innermost layer in a sleeved mode, and the outer wall of the model duct piece is connected with the inner wall of the prefabricated layer on the innermost layer in a sliding mode. A hole is formed in at least one side surface of the model box; the sleeved model duct piece and the multiple prefabricated layers are mounted in the model box, and at least one end of the model duct piece extends out of the model box through the hole; and the model box is filled with a model soil sample. According to the utility model, the purpose of manually controlling quantitative deformation of the stratum is achieved by pulling the arc-shaped prefabricated sheet, and the purpose of simulating the stratum controlled deformation excavation process of the circular section tunnel is achieved by combining the model duct piece and the model box.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnels, in particular to a stratum controlled deformation model test device for circular cross-section excavation. Background Art

[0002] The deformation and damage of various circular or nearly circular cross-section underground projects such as highway tunnels, railway tunnels, hydraulic tunnels, and urban subways during construction is a very complex process. At present, mathematical mechanics methods can only provide analytical solutions for some tunnel projects with simple shapes and simplified boundary conditions, and the analytical solutions obtained still rely on the verification of field measured data and model tests. The existing indoor model test equipment can only simulate the deformation characteristics and change laws of the model soil under specific working conditions, and cannot achieve quantitative control of stratum deformation during simulated tunnel excavation. Utility Model Content

[0003] The purpose of the utility model is to provide a stratum controlled deformation model test device for circular cross-section excavation to improve the above problems. In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0004] The present application provides a controlled deformation model test device for strata used for circular cross-section excavation, comprising: multiple prefabricated layers, model segments and a model box. Each of the prefabricated layers is a cylindrical structure surrounded by an even number of arc-shaped prefabricated segments of the same shape and size; the diameters of the multiple prefabricated layers just fit each other. The model segments are sleeved inside the innermost prefabricated layer, and the outer wall of the model segments is slidably connected to the inner wall of the innermost prefabricated layer. The model box is provided with an opening on at least one side; the sleeved model segments and multiple prefabricated layers are installed inside the model box, and at least one end is extended to the outside of the model box through the opening; the model box is filled with a model soil sample.

[0005] Furthermore, a supporting steel cylinder is provided, wherein the supporting steel cylinder is sleeved inside the model segment, and the outer wall of the supporting steel cylinder is slidably connected to the inner wall of the model segment.

[0006] Furthermore, the arc-shaped prefabricated sheets of different prefabricated layers are arranged alternately.

[0007] Furthermore, a center line in the width direction of one of the arc-shaped prefabricated segments is aligned with a crown ridge line of the model segment.

[0008] Furthermore, the joint formed by two adjacent arc-shaped prefabricated sheets of the same prefabricated layer is aligned with the arch ridge line of the model pipe segment.

[0009] Furthermore, the prefabricated layer in which the joint formed by two adjacent arcuate prefabricated sheets is directly opposite to the arch ridge line of the model pipe segment and the prefabricated layer in which the width direction center line of one of the arcuate prefabricated sheets is directly opposite to the arch ridge line of the model pipe segment are arranged alternately.

[0010] Furthermore, the outer wall of the outermost prefabricated layer is wrapped with a layer of stainless steel sheet, and the stainless steel sheet is slidably connected to the outer wall of the outermost prefabricated layer.

[0011] Furthermore, a soil pressure sensor is provided between the stainless steel sheet and the model soil sample.

[0012] Furthermore, the prefabricated layer material is flexible PVC.

[0013] Furthermore, the supporting steel cylinder is made of high-strength steel.

[0014] The beneficial effects of the utility model are:

[0015] The utility model realizes the purpose of artificially controlling the quantitative deformation of the stratum by pulling out the arc-shaped prefabricated pieces, and then realizes the purpose of simulating the controlled deformation excavation process of the stratum of the circular section tunnel by combining the model pipe segment and the model box.

[0016] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the embodiments of the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is the assembly diagram of the utility model;

[0019] Figure 2 This is a schematic diagram of the arc prefabricated piece being unfolded;

[0020] Figure 3 It is a three-dimensional diagram of the assembly of the model segment, supporting steel cylinder, prefabricated layer and stainless steel sheet;

[0021] Figure 4 It is the assembly cross-section diagram of the model segment, supporting steel cylinder, prefabricated layer and stainless steel sheet.

[0022] Markings in the figure:

[0023] 1. Model segment; 2. Support steel cylinder; 3. Prefabricated layer; 4. Model box; 5. Stainless steel sheet; 6. Arc-shaped prefabricated sheet. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, rather than all the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model for protection, but merely represents the selected embodiment of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0025] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present utility model, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0026] like Figure 1 As shown, this embodiment provides a stratum controlled deformation model test device for circular cross-section excavation, including: a multi-layer prefabricated layer 3, a model segment 1 and a model box 4.

[0027] Each prefabricated layer 3 is a cylindrical structure surrounded by an even number of arc-shaped prefabricated sheets 6 of the same shape and size; the diameters of the prefabricated layers 3 of the multiple layers just fit each other. The material of the prefabricated layer 3 is flexible PVC.

[0028] In this embodiment, the number of arc-shaped prefabricated sheets 6 of each prefabricated layer 3 is six, and the thickness is one millimeter. Figure 2 The quantitative deformation of the stratum during tunnel excavation is simulated by pulling out the arc-shaped prefabricated piece 6.

[0029] The model segment 1 is sleeved inside the innermost prefabricated layer 3 , and the outer wall of the model segment 1 is slidably connected to the inner wall of the innermost prefabricated layer 3 .

[0030] The model box 4 has at least one side with a hole; the sleeved model segments 1 and the multi-layer prefabricated layers 3 are installed inside the model box 4, and at least one end is extended to the outside of the model box 4 through the hole; the model box 4 is filled with a model soil sample.

[0031] The device is also provided with a support steel cylinder 2, which is sleeved inside the model segment 1, and the outer wall of the support steel cylinder 2 is slidably connected to the inner wall of the model segment 1. The support steel cylinder 2 is made of high-strength steel and is not easily deformed. The support steel cylinder 2 is a temporary deformation constraint of the model segment 1, which is used to prevent the model segment 1 from deforming when the model box 4 is filled with the model soil sample. It should be noted that after the model soil sample is filled, the support steel cylinder 2 needs to be pulled out first, and then the arc prefabricated segment 6 is pulled out.

[0032] like Figure 3 and Figure 4 As shown, the arcuate prefabricated sheets 6 of different prefabricated layers 3 are arranged in a staggered manner. The arrangement includes two modes: the first arrangement mode is that the width direction center line of one arcuate prefabricated sheet 6 is directly opposite to the arch ridge line of the model segment 1. The second arrangement mode is that the joint formed by two adjacent arcuate prefabricated sheets 6 of the same prefabricated layer 3 is directly opposite to the arch ridge line of the model segment 1.

[0033] The prefabricated layers 3 using the first arrangement manner and the prefabricated layers 3 using the second arrangement manner are arranged alternately.

[0034] The outer wall of the outermost prefabricated layer 3 is wrapped with a stainless steel sheet 5, and the stainless steel sheet 5 is slidably connected to the outer wall of the outermost prefabricated layer 3. During the extraction process of the arc-shaped prefabricated sheet 6, the stainless steel sheet 5 remains stationary to avoid disturbance of the model soil sample by the extraction of the arc-shaped prefabricated sheet 6, and plays the role of isolating the arc-shaped prefabricated sheet 6 from the prefabricated layer 3. It should be noted that due to the shielding of the model box 4, the model box 4 is not blocked. Figure 1 The stainless steel sheet 5 is not shown.

[0035] A soil pressure sensor is provided between the stainless steel sheet 5 and the model soil sample, which is used to monitor the changes in the stratum stress field during the extraction process of the arc-shaped prefabricated sheet 6 in real time.

[0036] The installation order for this application is:

[0037] Assembling the supporting steel cylinder 2, the model segment 1 and the multi-layer prefabricated layer 3;

[0038] The outer wall of the outermost prefabricated layer 3 is wrapped with a stainless steel sheet 5;

[0039] An earth pressure sensor is arranged on the outer wall of the stainless steel sheet 5 to obtain an assembly;

[0040] Fill the model box 4 with model soil samples in layers to the lowest position of the side opening;

[0041] Place the assembly horizontally into the model box 4 from the hole;

[0042] Fill the remaining model soil sample into the model box 4;

[0043] Pull out the supporting steel cylinder 2.

[0044] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0045] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A stratum controlled deformation model test device for circular cross-section excavation, characterized in that: include: A plurality of prefabricated layers (3), each of which is a cylindrical structure formed by an even number of arc-shaped prefabricated sheets (6) of the same shape and size; the diameters of the plurality of prefabricated layers (3) fit each other exactly; A model pipe segment (1), wherein the model pipe segment (1) is sleeved inside the innermost prefabricated layer (3), and the outer wall of the model pipe segment (1) is slidably connected to the inner wall of the innermost prefabricated layer (3); A model box (4), wherein at least one side of the model box (4) is provided with an opening; the sleeved model pipe segments (1) and the multiple prefabricated layers (3) are installed inside the model box (4), and at least one end is extended to the outside of the model box (4) through the opening; and the model box (4) is filled with a model soil sample.

2. The stratum controlled deformation model test device for circular cross-section excavation according to claim 1 is characterized in that: A supporting steel cylinder (2) is also provided. The supporting steel cylinder (2) is sleeved inside the model pipe segment (1), and the outer wall of the supporting steel cylinder (2) is slidably connected to the inner wall of the model pipe segment (1).

3. The stratum controlled deformation model test device for circular cross-section excavation according to claim 1, characterized in that: The arc-shaped prefabricated sheets (6) of different prefabricated layers (3) are arranged in a staggered manner.

4. The stratum controlled deformation model test device for circular cross-section excavation according to claim 3 is characterized in that: The width direction center line of one of the arc-shaped prefabricated sheets (6) is aligned with the arch ridge line of the model pipe segment (1).

5. The stratum controlled deformation model test device for circular cross-section excavation according to claim 3, characterized in that: The joint formed by two adjacent arc-shaped prefabricated sheets (6) of the same prefabricated layer (3) is aligned with the arch ridge line of the model pipe segment (1).

6. The stratum controlled deformation model test device for circular cross-section excavation according to claim 3, characterized in that: The prefabricated layer (3) whose joints formed by two adjacent arc-shaped prefabricated sheets (6) are directly opposite to the arch ridge line of the model pipe segment (1) and the prefabricated layer (3) whose width direction center line of one of the arc-shaped prefabricated sheets (6) is directly opposite to the arch ridge line of the model pipe segment (1) are interlaced.

7. The stratum controlled deformation model test device for circular cross-section excavation according to claim 1, characterized in that: The outer wall of the outermost prefabricated layer (3) is wrapped with a layer of stainless steel sheet (5), and the stainless steel sheet (5) is slidably connected to the outer wall of the outermost prefabricated layer (3).

8. The stratum controlled deformation model test device for circular cross-section excavation according to claim 7, characterized in that: A soil pressure sensor is provided between the stainless steel sheet (5) and the model soil sample.

9. The stratum controlled deformation model test device for circular cross-section excavation according to claim 1, characterized in that: The material of the prefabricated layer (3) is flexible PVC.

10. The stratum controlled deformation model test device for circular cross-section excavation according to claim 2, characterized in that: The support steel cylinder (2) is made of high-strength steel.

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