A new indoor model test platform for tunnel model excavation and adjacent pipeline support

Abstract

The invention discloses a novel indoor model test platform for tunnel model excavation and adjacent pipeline support, comprising a tunnel simulation part with adjustable length, wherein both ends of the bottom of the tunnel simulation part in the length direction are provided with a lifting support base device; a pipeline simulation component is provided in the tunnel simulation part, and a dial indicator and a plurality of strain gauges are provided on the pipeline simulation component; a plurality of arch support simulation plates of different specifications are provided on the bottom plate of the tunnel simulation part; the inclination angle of the tunnel simulation part can be arbitrarily changed by two lifting support base devices, so as to adapt to tunnel excavation of various sizes and support the excavated part by corresponding arch support simulation plates, so as to simulate and compare the changes of the settlement mechanism of adjacent pipelines around the tunnel and the soil stress caused by the tunnel slope, tunnel length and arch support plates of different sizes in the tunnel excavation process under different working conditions, so as to realize the simulation of multiple schemes, thereby saving costs and improving the efficiency of model test.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel excavation test equipment, in particular to a novel indoor model test platform for tunnel model excavation and adjacent pipeline support. Background Art

[0002] With the rapid development of my country's economy, the number and speed of road and bridge construction have increased significantly. In the process of road and bridge construction, it is inevitable to encounter the need to dig tunnels, especially in the southwest region with many mountains. Various geological safety problems are often encountered in the process of tunnel excavation, such as pipe bursts, sudden water and mud, rock bursts and other huge safety problems. Therefore, it is necessary to do a good job of supporting the tunnel during tunnel excavation. At present, underground projects in cities are also developing rapidly. In the process of urban underground tunnel excavation, it is also necessary to consider the impact of settlement on adjacent pipelines. Tunnel excavation often causes damage to adjacent pipelines, resulting in water, natural gas and crude oil leakage. At present, there are few studies on the model test mechanism in this field. Therefore, it is very necessary to carry out support mechanism analysis during tunnel excavation and settlement mechanism analysis on adjacent pipelines.

[0003] At present, scholars at home and abroad have carried out some research work on the support problems of tunnels and the settlement mechanism of adjacent pipelines during tunnel excavation, and have made some progress. However, the common indoor tunnel excavation model platforms are mostly single-function model test platforms, and the existing tunnel model excavation indoor model test platform devices are mostly fixed angles and cannot be adjusted, and cannot simulate the need for tunnel slope reduction caused by certain special geographical environmental factors in the natural environment; the length of the existing tunnel model excavation indoor model test platform device is fixed, and cannot adapt to different tunnel excavation simulation tests of multiple lengths; at the same time, during the tunnel excavation process, support measures are required for the top of the tunnel. The tunnel top support plate of the current common tunnel model excavation indoor model test platform device is set to a fixed width and height, which cannot adapt to tunnel excavation simulation tests of different widths and heights.

[0004] In summary, the existing indoor model test platform device for tunnel model excavation can only analyze a certain slope of the tunnel, or a single tunnel size, or a tunnel of a single length, and has few variable adjustment factors. When studying the settlement mechanism of adjacent pipelines caused by different tunnel slopes, different tunnel lengths, and multi-sized support plates, different tunnel model devices need to be made, resulting in high test costs, waste of resources, long test time and other prominent problems.

[0005] The present invention aims to innovate a novel indoor model test platform device for tunnel model excavation, so that a device can realize multi-functional factor changes and multi-scheme simulations, thereby saving costs and improving the efficiency of model testing. Summary of the invention

[0006] In view of the above problems in the prior art, the present invention provides a novel indoor model test platform for tunnel model excavation and adjacent pipeline support, which solves the problems that the existing indoor model test platform device for tunnel model excavation can only analyze a certain slope of the tunnel, or a single tunnel size, or a tunnel of a single length, and has few variable adjustment factors. When studying the settlement mechanism of adjacent pipelines caused by different tunnel slopes, different tunnel lengths and support plates of multiple sizes, different tunnel model devices need to be made, resulting in high test costs, waste of resources and long test time.

[0007] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows:

[0008] A novel indoor model test platform for tunnel model excavation and adjacent pipeline support is provided, which includes a tunnel simulation piece with adjustable length. The tunnel simulation piece is a hollow rectangular box-shaped structure. The upper top surface and one side surface in the length direction of the tunnel simulation piece are both provided with openings.

[0009] A lifting support base device is provided at both ends of the bottom of the tunnel simulation piece in the length direction;

[0010] A pipeline simulation component is arranged on the inner side surface of the other side in the length direction of the tunnel simulation component, one end of the pipeline simulation component is fixedly connected to the inner side surface of the tunnel simulation component, and the other end extends along the length direction of the tunnel simulation component and penetrates the tunnel simulation component, and a dial indicator and a plurality of strain gauges are arranged on the pipeline simulation component;

[0011] A plurality of arch support simulation plates of different specifications are arranged on the bottom plate of the tunnel simulation piece, and the plurality of arch support simulation plates can slide along the length direction of the tunnel simulation piece through a slide rail;

[0012] The pipeline simulation component is located above a plurality of arch support simulation plates.

[0013] The basic principle of the new indoor model test platform for tunnel model excavation and adjacent pipeline support in this scheme is: when conducting the test, the tunnel simulation is adjusted to the preset length of the test, and the slope of the tunnel simulation is adjusted to the preset slope of the test through the lifting action of two lifting support base devices, and then the clay is backfilled and compacted into the tunnel simulation, and then the tunnel excavation process is simulated from the side of the length direction of the tunnel simulation. After the clay is excavated to the preset length of the test, according to the actual situation of the test, arch support simulation plates of different specifications are selected to support the excavated part. At each preset time interval, the settlement of the pipeline simulation component and the stress change of the soil around the pipeline are measured by a dial indicator and multiple strain gauges, so as to achieve the purpose of revealing the intrinsic connection between different tunnel slopes and the settlement mechanism and soil stress of the adjacent pipelines around the tunnel, thereby providing reference data for the design of support engineering in the subsequent tunnel excavation process. The new indoor model test platform for tunnel model excavation and adjacent pipeline support in this scheme can arbitrarily change the inclination angle and overall length of the tunnel simulation parts, can adapt to tunnel excavation of various sizes and support the excavation part through the corresponding arch support simulation board. It can simulate the changes in the settlement mechanism and soil stress of the adjacent pipelines around the tunnel under different working conditions, such as the slope of the tunnel, the length of the tunnel and the arch support boards of different sizes during the tunnel excavation process, and realize the simulation of multiple schemes, thereby saving costs and improving the efficiency of model testing.

[0014] Further, as a specific implementation scheme of the tunnel simulation member having an adjustable length, a bottom plate telescopic plate and a bottom plate telescopic slide rail are installed in the bottom plate of the tunnel simulation member, and side plate telescopic plates and side plate telescopic slide rails are installed in the side plates on both sides of the tunnel simulation member;

[0015] The bottom plate telescopic plate and the side plate telescopic plate are located at the same cross-section position of the tunnel simulation part; the bottom plate telescopic slide rail and the side plate telescopic slide rail are both arranged along the length direction of the tunnel simulation part.

[0016] Furthermore, as a specific arrangement of the bottom plate telescopic plate and the side plate telescopic plate, the bottom plate telescopic plate and the side plate telescopic plate both include an outer plate and a telescopic inner plate that are slidably connected.

[0017] By designing a telescopic plate structure on the bottom plate and side plates of the tunnel simulation, the length of the tunnel simulation can be changed, so that the tunnel model excavation test platform can be used to simulate different tunnel lengths, analyze the influence of tunnel length on the settlement mechanism of adjacent pipelines around the tunnel and soil stress, so that the device of the present invention can be repeatedly used for indoor model test research of different lengths, avoiding the one-time use of traditional fixed-length tunnel models, causing waste, and effectively reducing the test cost. In addition, by adjusting the length of the telescopic plate, it can be used to simulate the influence of different lengths of tunnels on the settlement mechanism of adjacent pipelines around the tunnel and soil stress during the actual tunnel excavation process, thereby providing a reference for the design and construction of tunnel excavation projects.

[0018] Furthermore, a movable trolley is provided at the bottom of each lifting support base device, and the provision of the movable trolley facilitates the movement of the entire model test platform.

[0019] Furthermore, as a specific implementation of the lifting support base device, each lifting support base device includes a lifting scissor frame and a hydraulic cylinder for driving the lifting scissor frame to extend or shorten, and the two ends of the lifting scissor frame are fixedly connected to the bottom of the tunnel simulation and the top of the mobile trolley respectively. The hydraulic cylinder drives the lifting scissor frame to extend or shorten, so as to change the slope of the tunnel simulation, and can simulate different situations of the natural environment and achieve the purpose of simulating different slopes of tunnels in reality, so as to achieve one device to simulate different tunnel slopes, and can analyze the influence of tunnel slope on the settlement mechanism of adjacent pipelines around the tunnel and soil stress, revealing the intrinsic connection between different tunnel slopes and the settlement mechanism of adjacent pipelines around the tunnel and soil stress, so as to provide reference data for the design of support engineering in the subsequent tunnel excavation process. Overcoming the problem that the traditional tunnel model cannot automatically adjust the slope makes the research of this experiment more in line with the actual situation.

[0020] Furthermore, the plurality of arch support simulation plates include a first arch support simulation plate, a second arch support simulation plate and a third arch support simulation plate which are sequentially arranged from the inside to the outside; a pair of first slide rails, a second slide rail and a third slide rail are respectively arranged on both sides of the first arch support simulation plate, the second arch support simulation plate and the third arch support simulation plate, and the first slide rail, the second slide rail and the third slide rail are all arranged on the bottom plate of the tunnel simulation part and are all arranged along the length direction of the tunnel simulation part. The first slide rail, the second slide rail and the third slide rail can adapt to arch support simulation plates of different sizes, so as to continuously advance the support of the tunnel, thereby simulating the support of tunnel excavation of different sizes, analyzing the internal connection between the settlement mechanism of tunnels of different sizes and the surrounding adjacent pipelines and the soil stress, so that the device of the present invention can be repeatedly used for model test research of tunnel excavation of different sizes. It avoids the traditional fixed single-size tunnel excavation support simulation, can avoid the defect that the model test platform cannot be used multiple times, and can effectively reduce the test cost.

[0021] The beneficial effects of the present invention are as follows: the novel indoor model test platform for tunnel model excavation and adjacent pipeline support in the present scheme can arbitrarily change the inclination angle of the tunnel simulation part through two lifting support base devices, change the overall length of the tunnel simulation part through the bottom plate telescopic plate and the side plate telescopic plate, and can adapt to tunnel excavation of various sizes and support the excavation part through the corresponding arch support simulation plate. It can simulate the changes in the settlement mechanism and soil stress of the adjacent pipelines around the tunnel under different working conditions, such as the slope of the tunnel, the length of the tunnel and the arch support plates of different sizes during the tunnel excavation process, and realize the simulation of multiple schemes, thereby saving costs and improving the efficiency of model testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of the indoor model test platform for the excavation of a new type of tunnel model and adjacent pipeline support.

[0023] Figure 2 This is a schematic diagram of the front view of the indoor model test platform for excavation of a new type of tunnel model and adjacent pipeline support.

[0024] Figure 3 It is a structural schematic diagram of the bottom plate telescopic plate and the side plate telescopic plate.

[0025] Figure 4 Schematic diagram of the installation structure of multiple arch support simulation panels.

[0026] Among them, 1. Tunnel simulation part; 2. Lifting support base device; 3. Moving trolley; 4. Bottom plate telescopic plate; 5. Bottom plate telescopic slide rail; 6. Side plate telescopic plate; 7. Side plate telescopic slide rail; 8. First slide rail; 9. Second slide rail; 10. Third slide rail; 11. First arch support simulation board; 12. Second arch support simulation board; 13. Third arch support simulation board; 14. Pipeline simulation component; 15. Outer plate; 16. Telescopic inner plate; 17. Dial indicator; 18. Strain gauge. DETAILED DESCRIPTION

[0027] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0028] Example 1

[0029] like Figures 1 to 4As shown, the present invention provides a novel indoor model test platform for tunnel model excavation and adjacent pipeline support, which includes a tunnel simulation part 1 with adjustable length. The tunnel simulation part 1 is a hollow rectangular box-shaped structure, and openings are provided on the upper top surface and one side surface in the length direction of the tunnel simulation part 1.

[0030] A lifting support base device 2 is provided at both ends of the bottom in the length direction of the tunnel simulation part 1 .

[0031] A moving trolley 3 is provided at the bottom of each lifting support base device 2. The provision of the moving trolley 3 facilitates the movement of the entire model test platform.

[0032] A pipeline simulation component 14 is arranged on the inner side surface on the other side of the length direction of the tunnel simulation component 1. One end of the pipeline simulation component 14 is fixedly connected to the inner side surface of the tunnel simulation component 1, and the other end extends along the length direction of the tunnel simulation component 1 and penetrates the tunnel simulation component 1. A dial indicator 17 and multiple strain gauges 18 are arranged on the pipeline simulation component 14.

[0033] Specifically, a dial indicator 17 is provided on the end of the pipeline simulation component 14 fixedly connected to the inner side surface of the tunnel simulation component 1 , and a plurality of strain gauges 18 are evenly spaced and arranged on the circumferential outer wall of the pipeline simulation component 14 .

[0034] As a specific implementation scheme for adjusting the length of the tunnel simulation 1, a bottom plate telescopic plate 4 and a bottom plate telescopic slide rail 5 are installed in the bottom plate of the tunnel simulation 1, and a side plate telescopic plate 6 and a side plate telescopic slide rail 7 are installed in the side plates on both sides of the tunnel simulation 1; the bottom plate telescopic plate 4 and the side plate telescopic plate 6 are located at the same cross-sectional position of the tunnel simulation 1; the bottom plate telescopic slide rail 5 and the side plate telescopic slide rail 7 are both arranged along the length direction of the tunnel simulation 1.

[0035] As a specific arrangement of the bottom plate telescopic plate 4 and the side plate telescopic plate 6 , the bottom plate telescopic plate 4 and the side plate telescopic plate 6 both include an outer plate 15 and a telescopic inner plate 16 that are slidably connected.

[0036] The tunnel simulation part 1 changes its length through the bottom plate telescopic plate 4 and the side plate telescopic plate 6. In this embodiment, the lengths of the tunnel simulation part 1 are 2000mm, 2500mm and 3000mm respectively, the width of the tunnel simulation part 1 is 600mm, and the height of the tunnel simulation part 1 is 500mm. During the test, the influence of the tunnel length on the settlement mechanism of the adjacent pipelines around the tunnel and the soil stress can be analyzed.

[0037] A lifting support base device 2 is provided at both ends of the bottom of the tunnel simulation part 1 in the length direction. As a specific setting mode of the lifting support base device 2, each of the lifting support base devices 2 includes a lifting scissor frame and a hydraulic cylinder for driving the lifting scissor frame to extend or shorten, and the two ends of the lifting scissor frame are respectively fixedly connected to the bottom of the tunnel simulation part 1 and the top of the mobile trolley 3. In this embodiment, the slope of the tunnel simulation part 1 can be changed by two lifting support base devices 2, and the slope of the tunnel simulation part 1 is specifically limited to 15°, 30° and 45°, respectively. The influence of the tunnel under different slopes on the settlement mechanism and soil stress of the adjacent pipelines around the tunnel can be analyzed, and the intrinsic connection between different tunnel slopes and the settlement mechanism and soil stress of the adjacent pipelines around the tunnel is revealed, thereby providing reference data for the design of support engineering in the subsequent tunnel excavation process.

[0038] A plurality of arch support simulation plates of different specifications are arranged on the bottom plate of the tunnel simulation part 1, and the plurality of arch support simulation plates can slide along the length direction of the tunnel simulation part 1 through the slide rails. The pipeline simulation component 14 is located above the plurality of arch support simulation plates.

[0039] Specifically, the multiple arch support simulation panels include a first arch support simulation panel 11, a second arch support simulation panel 12 and a third arch support simulation panel 13 which are arranged in sequence from the inside to the outside; a pair of first slide rails 8, a second slide rail 9 and a third slide rail 10 are respectively arranged on both sides of the first arch support simulation panel 11, the second arch support simulation panel 12 and the third arch support simulation panel 13, and the first slide rail 8, the second slide rail 9 and the third slide rail 10 are all arranged on the bottom plate of the tunnel simulation component 1 and are all arranged along the length direction of the tunnel simulation component 1.

[0040] The size of the first arch support simulation board 11 is 500mm, 400mm wide and 100mm high; the size of the second arch support simulation board 12 is 500mm, 500mm wide and 200mm high, and the size of the third arch support simulation board 13 is 500mm long, 600mm wide and 300mm high. During the continuous excavation, the tunnel is supported, so as to simulate the support of tunnel excavation of different sizes and analyze the internal connection between the settlement mechanism of tunnels of different sizes and the surrounding adjacent pipelines and soil stress.

[0041] By setting the tunnel simulation part 1 to different lengths and slopes and the arch support simulation plate to different specifications and models, combined with the above-mentioned different test change factors, the simulation test can be divided into 27 groups to explore the settlement changes and soil stress state changes of the pipeline simulation component 14 in the tunnel simulation part 1 within the specified time under different tunnel simulation part 1 slopes, different tunnel simulation part 1 lengths, and different sizes of arch support simulation plates. The specific test variables are shown in Table 1.

[0042] Table 1 Scheme of variation factors in indoor model test of tunnel model excavation

[0043]

[0044] In order to further specifically illustrate the test steps of the new tunnel model excavation and adjacent pipeline support indoor model test platform, this embodiment takes a group of model tests as an example for detailed description, that is, the tunnel simulation part 1 has a slope of 15°, the tunnel simulation part 1 is 2500mm long, and the arch support simulation board is 500mm long, 600mm wide, and 300mm high. The operation process of the model test scheme is as follows:

[0045] Step 1: Adjust the slope of the tunnel simulation 1 to 15° through two lifting support base devices 2, and then extend the bottom plate telescopic plate 4 and the side plate telescopic plate 6 to 500mm, so that the length of the tunnel simulation 1 reaches 2500mm.

[0046] Step 2: two third slide rails 10 are arranged on the bottom plate of the tunnel simulation part 1, the spacing between the two third slide rails 10 is 600 mm, clay is backfilled and compacted into the tunnel simulation part 1, and at the same time, the pipeline simulation component 14 is buried at a depth of 200 mm until the clay fills the tunnel simulation part 1;

[0047] Step 3: Simulate the tunnel excavation process from the side of the tunnel simulation part 1 in the length direction. After excavating 500mm, push the arch support simulation plate 500mm through the third slide rail 10 to support the excavated part. Then install the pipeline settlement observation point and pipeline strain detection point under the pipeline component, and monitor the settlement value and strain value of the pipeline simulation component 14 through the dial gauge 17 and the strain gauge 18 every 20 minutes.

[0048] Similarly, the above method was also used in the test operations of other groups with different test change factors. Finally, various monitoring data indicators in other different test schemes were compared and analyzed to reveal the influence of tunnel slope, tunnel length and arch support plates of different sizes on the settlement mechanism of adjacent pipelines around the tunnel and soil stress changes during tunnel excavation, thereby providing a reference for actual engineering.

[0049] To sum up, the new indoor model test platform for tunnel model excavation and adjacent pipeline support in the present scheme can arbitrarily change the inclination angle of the tunnel simulation part 1 through two lifting support base devices 2, and change the overall length of the tunnel simulation part 1 through the bottom plate telescopic plate 4 and the side plate telescopic plate 6, and can adapt to tunnel excavation of various sizes and support the excavation part through the corresponding arch support simulation plate. It can simulate the changes in the settlement mechanism and soil stress of the adjacent pipelines around the tunnel under different working conditions, such as the slope of the tunnel, the length of the tunnel and the arch support plates of different sizes during the tunnel excavation process, so as to realize the same simulation test platform to implement multiple simulation tests, avoid the production of different tunnel model devices, thereby saving costs and improving the efficiency of model tests. The invention solves the problem that the existing indoor model test platform device for tunnel model excavation can only analyze a certain slope of the tunnel, or a single tunnel size, or a tunnel of a single length, and has few variable adjustment factors. When studying the settlement mechanism of adjacent pipelines caused by different tunnel slopes, different tunnel lengths and support plates of multiple sizes, different tunnel model devices need to be made, which leads to high test costs, waste of resources and long test time.

[0050] Example 2

[0051] This embodiment is further limited on the basis of the embodiment 1. The main improvement of this embodiment is that a curing box is further provided inside the tunnel simulation part 1, and a temperature regulating device, a humidification system and a control module are provided inside the curing box.

[0052] The temperature regulating device includes the multiple temperature heating elements and multiple temperature sensors which are all electrically connected to the control module; the multiple temperature heating elements are inserted into the soil of the tunnel simulation part 1 and are used to heat the soil. The multiple temperature heating elements can be heating rods. After grouting and spraying of concrete after tunnel excavation, since the maintenance of concrete and grouting materials will directly affect the lining and maintenance effect of the model, the device can be used to better maintain it and make it reach the required temperature for maintenance. Multiple temperature sensors are set in the soil of the tunnel simulation part 1 to measure the temperature change inside the tunnel simulation part 1 and transmit the temperature of the tunnel simulation part 1 to the control module in real time. The control module controls the temperature heating element to heat up, so as to achieve the constant temperature of the tunnel simulation part 1 at 20°C, so that the maintenance of the grouting material and the concrete in the subsequent lining process can meet the requirements, thereby realizing the integration of the excavation, support and maintenance model of the tunnel model test.

[0053] The humidification system includes a water tank and a plurality of water spray heads arranged in the soil of the tunnel simulation part 1. The water tank is provided with a water pump electrically connected to the control module. The plurality of water spray heads are connected to the water tank through pipes. The tunnel simulation part 1 is also provided with a plurality of humidity sensors electrically connected to the control module. The plurality of humidity sensors are arranged in the tunnel simulation part 1 to measure the humidity change inside the tunnel simulation part 1, and transmit the humidity inside the tunnel simulation part 1 to the control module in real time. The control module controls the plurality of water spray heads to spray water, thereby achieving the constant humidity inside the tunnel simulation part 1 within the preset range, so as to achieve the curing conditions of the concrete after grouting and lining in accordance with the standard curing. In addition, this function can also adjust the humidity of the soil of the tunnel model to analyze the deformation law of the tunnel during the excavation and support of the tunnel under different humidity conditions, so as to explore the influence of tunnel excavation on the settlement mechanism and soil stress of the adjacent pipelines around the tunnel under different humidity environments.

Claims

1. A new type of indoor model test platform for tunnel model excavation and adjacent pipeline support, characterized in that: It comprises a tunnel simulation piece with adjustable length, the tunnel simulation piece is a hollow rectangular box-shaped structure, and the upper top surface and one side surface in the length direction of the tunnel simulation piece are both provided with openings; A lifting support base device is provided at both ends of the bottom in the length direction of the tunnel simulation piece; A pipeline simulation component is arranged on the inner side surface of the other side in the length direction of the tunnel simulation component, one end of the pipeline simulation component is fixedly connected to the inner side surface of the tunnel simulation component, and the other end extends along the length direction of the tunnel simulation component and penetrates the tunnel simulation component, and a dial indicator and a plurality of strain gauges are arranged on the pipeline simulation component; A plurality of arch support simulation plates of different specifications are arranged on the bottom plate of the tunnel simulation piece, and the plurality of arch support simulation plates can slide along the length direction of the tunnel simulation piece through a slide rail; The pipeline simulation component is located above a plurality of arch support simulation plates; A bottom plate telescopic plate and a bottom plate telescopic slide rail are installed in the bottom plate of the tunnel simulation part, and a side plate telescopic plate and a side plate telescopic slide rail are installed in the side plates on both sides of the tunnel simulation part; The bottom plate telescopic plate and the side plate telescopic plate are located at the same cross-sectional position of the tunnel simulation part; the bottom plate telescopic slide rail and the side plate telescopic slide rail are both arranged along the length direction of the tunnel simulation part; The plurality of arch support simulation panels include a first arch support simulation panel, a second arch support simulation panel and a third arch support simulation panel which are sequentially arranged from the inside to the outside; A pair of first slide rails, a second slide rail and a third slide rail are respectively arranged on both sides of the first arch support simulation plate, the second arch support simulation plate and the third arch support simulation plate, and the first slide rails, the second slide rails and the third slide rails are all arranged on the bottom plate of the tunnel simulation member and are all arranged along the length direction of the tunnel simulation member; The inclination angle of the tunnel simulation can be changed at will through two lifting support base devices; the overall length of the tunnel simulation can be changed by the telescopic plates of the bottom plate and the side plates; the excavated part can be supported by arch support simulation plates of different specifications; and the effects of the slope of the tunnel, the length of the tunnel and the changes in the settlement mechanism of adjacent pipelines and soil stress around the tunnel by arch support plates of different sizes during tunnel excavation can be compared and analyzed.

2. The new type of tunnel model excavation and adjacent pipeline support indoor model test platform according to claim 1 is characterized in that: The bottom plate telescopic plate and the side plate telescopic plate both include an outer plate and a telescopic inner plate which are slidably connected.

3. The new type of tunnel model excavation and adjacent pipeline support indoor model test platform according to claim 1 is characterized in that: A movable trolley is arranged at the bottom of each lifting support base device.

4. The novel tunnel model excavation and adjacent pipeline support indoor model test platform according to claim 3 is characterized in that: Each of the lifting support base devices includes a lifting scissors frame and a hydraulic cylinder for driving the lifting scissors frame to extend or shorten. The two ends of the lifting scissors frame are respectively fixedly connected to the bottom of the tunnel simulation component and the top of the moving trolley.

5. The novel indoor model test platform for tunnel model excavation and adjacent pipeline support according to claim 1 is characterized in that: The dial indicator is arranged on the end portion of the pipeline simulation component fixedly connected to the inner side surface of the tunnel simulation component, and a plurality of strain gauges are evenly arranged on the circumferential outer wall of the pipeline simulation component.

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