Design method for three-plate cutterhead of full-face rock tunnel boring machine

Abstract

The invention relates to the technical field of cutterheads of full-face rock tunnel boring machines, and discloses a design method for a three-plate cutterhead of a full-face rock tunnel boring machine. The method comprises the following specific steps: determining parameter values of a cutterhead key structure according to a cutterhead structure theory, designing cutterhead test schemes with different structure parameters according to an orthogonal test in combination with factors influencing cutterhead deformation, establishing a cutterhead three-dimensional numerical model, and performing cutterhead deformation analysis through finite element software to obtain a cutterhead deformation analysis result. And according to the cutterhead range analysis, determining an optimal cutterhead design scheme. The method has the beneficial effects that the horizontal sequence of influencing the deformation of the cutterhead is determined as follows: the support-diameter ratio R0 / Rgt of the cutterhead; horizontal is the thickness delta 2gt of the middle plate; the thickness of the front plate is delta 1gt; the distance between the front plate and the middle plate is t1gt; the thickness of the connecting plate is delta 3gt; the distance between the middle plate and the connecting plate is t2. Due to the change of the structure of the cutterhead, the overall rigidity of the cutterhead is greatly improved, deformation of the cutterhead body is reduced, the cooperative rock breaking efficiency of the disc cutters on the cutterhead is improved, the improvement of the tunneling speed of the TBM is greatly improved, and the cost is saved.

Description

Technical Field

[0001] The patent of this invention relates to the technical field of full-section rock tunnel boring machine cutter discs, and specifically, to a design method for a three-plate cutter disc of a full-section rock tunnel boring machine. Background Art

[0002] Since the 21st century, full-face rock tunnel boring machines have been widely used in my country's tunnel projects, such as railways, highways, subways, water conservancy and other fields, and have played an important role in promoting the development of my country's infrastructure construction. However, in some TBM construction cases, extremely hard rock formations will appear. Extremely hard rock reduces the TBM excavation speed and excavation operation utilization rate, reduces monthly footage, prolongs the construction period, and significantly increases cost consumption. This puts higher requirements on the mechanical properties of the TBM cutterhead, such as strength and stiffness. Therefore, it is necessary to design a three-plate cutterhead for a full-face rock tunnel boring machine in combination with the cutterhead structure theory to solve the above technical problems. Summary of the invention

[0003] The invention aims to provide a design method for a three-plate cutterhead of a full-section rock tunnel boring machine, so as to improve the overall rigidity of the cutterhead and reduce the overall deformation of the cutterhead.

[0004] Furthermore, the structural theory includes a theoretical formula for the deflection of the cutter head panel obtained from the elastic mechanics theory:

[0005]

[0006] Where: w-cutterhead deflection; q-surface load acting on the cutterhead, which is determined by the surrounding rock conditions, the number of disc cutters on the cutterhead and the penetration rate; R0-cutterhead support radius; r-distance from a point on the cutterhead mid-plane to the z-axis (polar diameter); D-cutterhead bending stiffness, Wherein, E is Young's elastic modulus of the cutter disc material, t is the thickness of the cutter disc, and μ is the Poisson's ratio of the cutter disc material.

[0007] Furthermore, the elastic deformation and thickness determination theory of the cutter disc connecting plate (3) is based on the basic idea that the deformation of the cutter disc connecting plate (3) is as small and uniform as possible. The cutter disc connecting plate (3) is connected to the cutter disc intermediate plate (2) at the cutter disc radius edge. For the convenience of theoretical research, the cutter disc connecting plate (3) is regarded as an elastic thin plate fixed to the cutter disc panel. The cutter disc connecting plate deflection equation can be deduced from the cutter disc panel deflection equation (Formula 1):

[0008]

[0009] Where: D l - Bending stiffness of the cutterhead connection plate, δ3-cutting disc connecting plate thickness; R-cutting disc radius.

[0010] Furthermore, in the cutter head support stiffness theory, the cutter head support is located behind the cutter head, plays the role of supporting the cutter head and bearing the torque and thrust from the cutter head. Based on the elastic mechanics theory, the relationship between the cutter head radius and the cutter head support (6) radius when the cutter head support stiffness is optimal is established, and the equation is as follows:

[0011]

[0012] The simplified value is 0.5R~0.8R.

[0013] Furthermore, the design method reasonably determines the thickness of the cutter disc front plate (1), the cutter disc middle plate (2) and the cutter disc connecting plate (3), the distance between the cutter disc front plate (1) and the cutter disc middle plate (2), the distance between the cutter disc connecting plate (3) and the cutter disc middle plate (2), and the cutter disc support disc diameter ratio, i.e., the ratio of the cutter disc radius to the cutter disc support radius. The specific design steps are as follows:

[0014] Step 1, according to the structure of the three-plate cutterhead, determine the main factors affecting the deformation of the three-plate cutterhead of the full-face rock tunnel boring machine: the thickness δ1 of the cutterhead front plate (1), the thickness δ2 of the cutterhead middle plate (2), the thickness δ3 of the cutterhead connecting plate (3), the distance t1 between the cutterhead front plate (1) and the cutterhead middle plate (2), the distance t2 between the cutterhead connecting plate (3) and the cutterhead middle plate (2), and the cutterhead support plate diameter ratio R0 / R, that is, R0 is the radius of the cutterhead support (6), and R is the radius of the cutterhead; Step 2, design an orthogonal test based on the main factors of the three-plate cutter head deformation and determine the test plan; Step 3, establishing a three-dimensional model of each scheme of the three-plate cutterhead of the full-section rock tunnel boring machine according to the test scheme, and performing finite element simulation; Step 4, determining the optimal cutterhead solution based on the deformation variables and standard deviations of each cutterhead solution obtained by finite element simulation; Step 5, obtain the cutterhead structure according to the index parameter formula and the range formula, compare and analyze it with the better cutterhead, and determine the optimal cutterhead structure design scheme.

[0015] Furthermore, the step 2 specifically includes: Step 2.1, determine the thickness δ1 of the cutter disc front plate (1), the thickness δ2 of the cutter disc middle plate (2), the thickness δ3 of the cutter disc connecting plate (3), the distance t1 between the cutter disc front plate (1) and the cutter disc middle plate (2), the distance t2 between the cutter disc connecting plate (3) and the cutter disc middle plate (2), and the cutter disc support plate diameter ratio R0 / R as test indicators; Step 2.2, determine the level table of factors affecting the cutter head; Table 1 Three-plate cutter disc structural parameter factors-level table Step 2.3, through orthogonal test design, determine the parameter combination of the three-plate cutterhead of the full-section rock tunnel boring machine with uniform deformation, and determine the test plan of the three-plate cutterhead of the full-section rock tunnel boring machine. Table 2 Orthogonal test scheme for three-plate cutterhead structural parameters

[0016] Furthermore, the step 3 specifically includes: Step 3.1, building a three-dimensional model according to the three-plate cutterhead test plan of the full-face rock tunnel boring machine; Step 3.2, import the 3D model into the finite element software and set the mesh and cutterhead properties; Step 3.3, set the analysis step, where the analysis step is set to static and linear perturbation; Step 3.4, the boundary condition of the cutter head front plate (1) is a concentrated load, and the cutter head support (6) is set to a completely fixed constraint; Step 3.5, create a job module and submit the job.

[0017] Furthermore, the cutter disc front panel is welded to the cutter disc middle plate (2) via a hob seat (4), and the cutter disc connecting plate (3) is welded to the cutter disc middle plate (2) via a supporting rib (5).

[0018] Furthermore, the cutter disc front plate (1) is a whole plate structure.

[0019] Furthermore, the cutter disc middle plate (2) is a whole plate structure.

[0020] Furthermore, the cutter disc connecting plate (3) is a whole plate structure. Compared with the prior art, the advantages of the present invention are: the present invention provides a three-plate cutter head design method for a full-section rock tunnel boring machine, which can ensure the overall stability of the cutter head, greatly improve the rigidity of the cutter head, avoid large local deformation of the cutter head, ensure the efficiency of the disc-shaped roller in collaborative rock breaking, and further improve the safety and reliability of the cutter head construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and additional aspects of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which Figure 1 The present invention is a structural diagram of a three-plate cutterhead of a full-section rock tunnel boring machine. Figure 2 The present invention is a top view of a three-plate cutterhead structure of a full-section rock tunnel boring machine. Figure 3 The present invention is a cross-sectional view of a three-plate cutterhead structure of a full-section rock tunnel boring machine. Figure 4 Deformation curves of connecting plates with different thicknesses. Figure 5 The structural parameters of the three-plate cutter disc Figure 6 This is the average deformation diagram of the three-plate cutter disc radius for Schemes 1-5. Figure 7 This is the average deformation diagram of the three-plate cutter disc radius for Scheme 6-10. Figure 8 This is the average deformation diagram of the three-plate cutter disc radius for Schemes 11-15. Fig. 9 This is the average deformation diagram of the three-plate cutter disc radius for Schemes 16-20. Fig.10 This is the average deformation diagram of the three-plate cutter disc radius for Schemes 21-25. Fig.11 This is a comparative analysis diagram of the cutter head deformation between the extreme difference analysis scheme and scheme 25. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below. The embodiments are exemplary and are intended to be used to explain the present invention, but should not be understood as limiting the present invention. In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0023] like Figures 1 to 3 As shown, a three-plate cutterhead structure of a full-face rock tunnel boring machine comprises a cutterhead seat (4), a cutterhead front plate (1), a cutterhead middle plate, a cutterhead connecting plate (3), a cutterhead support (6) and a supporting rib (5), wherein the cutterhead front plate (1) is welded to the cutterhead middle plate (2) via the cutterhead seat (4), and the cutterhead connecting plate (3) is welded to the cutterhead middle plate (2) via the supporting rib (5). The cutterhead front plate (1), the cutterhead middle plate (2) and the cutterhead connecting plate (3) are a whole plate structure.

[0024] In response to the technical defects of existing cutterheads such as uneven deformation and excessive deformation, the invention proposes a three-plate cutterhead design method for a full-section rock tunnel boring machine, aiming to ensure the overall stability of the cutterhead, greatly improve the rigidity of the cutterhead, avoid large local deformation of the cutterhead, ensure the efficiency of the disc-shaped roller in collaborative rock breaking, and further improve the safety and reliability of the cutterhead construction.

[0025] Embodiment 1

[0026] The theoretical formula for the deflection of the cutter head panel obtained from the theory of elastic mechanics is:

[0027]

[0028] Where: w-cutterhead deflection; q-surface load acting on the cutterhead, which is determined by the surrounding rock conditions, the number of disc cutters on the cutterhead and the penetration rate; R0-cutterhead support radius; r-distance from a point on the cutterhead mid-plane to the z-axis (polar diameter); D-cutterhead bending stiffness, Wherein, E is Young's elastic modulus of the cutter disc material, t is the thickness of the cutter disc, and μ is the Poisson's ratio of the cutter disc material.

[0029] Theory of elastic deformation and thickness determination of the cutterhead connecting plate. The basic idea of ​​the determination theory is that the deformation of the cutterhead connecting plate (3) is as small and uniform as possible. The cutterhead connecting plate (3) is connected to the cutterhead panel at the edge of the cutterhead radius. For the convenience of theoretical research, the cutterhead connecting plate (3) is regarded as an elastic thin plate fixed to the cutterhead panel. The deflection equation of the cutterhead connecting plate (3) can be deduced through the cutterhead panel deflection equation (Equation 1):

[0030]

[0031] Where: D l - Bending stiffness of the cutterhead connection plate, δ3-cutting disc connecting plate thickness; R-cutting disc radius.

[0032] Taking a water diversion tunnel project TBM three-plate cutterhead as the background, the cutterhead diameter is 8m, and the elastic modulus of the cutterhead connecting plate is E=2×10 11 N / m 2 , Poisson's ratio μ = 0.26, the uniform load on the cutterhead is q = 2.64 × 10 5 N / m 2 The thickness of the connecting plate δ3 is 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, and 60mm respectively. Substituting the above data into formula (2), the deflection values ​​at different radial positions on the cutter head can be obtained by calculation. The curve of the deflection value of the connecting plate with different thicknesses changing with the radius is as follows: Figure 4 As shown. Figure 4 It can be seen that the deflection value w of the connecting plate l As δ3 increases, it gradually becomes uniform. l When <40mm, w l The amplitude of the change with δ3 is large; when w l When ≥40mm, w l As δ3 changes, it gradually becomes stable. Therefore, in order to ensure that the deflection value of the cutter head tends to be stable, the thickness of the connecting plate should satisfy δ3 ≥ 40 mm when designing a three-plate cutter head.

[0034] The cutter head support stiffness theory, the cutter head main bearing is located behind the cutter head, which plays the role of supporting the cutter head and bearing the torque and thrust from the cutter head. Based on the elastic mechanics theory, the relationship between the cutter head radius and the cutter head support (6) radius when the cutter head support stiffness is optimal is established, and the equation is as follows:

[0035]

[0036] The simplified value is 0.5R~0.8R, which is the range of the cutter head support disc diameter ratio.

[0037] Embodiment 2

[0038] The design method reasonably determines the thickness of the cutter disc front plate (1), the cutter disc middle plate (2) and the cutter disc connecting plate (3), the distance between the cutter disc front plate (1) and the cutter disc middle plate (2), the distance between the cutter disc connecting plate (3) and the cutter disc middle plate (2), and the cutter disc support disc diameter ratio, i.e., the ratio of the cutter disc radius to the cutter disc support (6) radius. The specific design steps are as follows:

[0039] Step 1, according to the structure of the three-plate cutterhead, determine the main factors affecting the deformation of the three-plate cutterhead of the full-section rock tunnel boring machine: the thickness of the cutterhead front plate (1), the thickness of the cutterhead middle plate (2), the thickness of the cutterhead connecting plate (3), the distance between the cutterhead front plate (1) and the cutterhead middle plate (2), the distance between the cutterhead connecting plate (3) and the cutterhead middle plate (2), and the cutterhead support plate diameter ratio.

[0040] Step 2: Design an orthogonal experiment and determine the experimental plan.

[0041] Step 2 specifically includes steps 2.1 to 2.3.

[0042] Step 2.1, determine the thickness δ1 of the cutter head front plate (1), the thickness δ2 of the cutter head middle plate (2), the thickness δ3 of the cutter head connecting plate (3), the distance t1 between the cutter head front plate (1) and the cutter head middle plate (2), the distance t2 between the cutter head connecting plate and the cutter head middle plate (2), and the cutter head support plate diameter ratio R0 / R as test indicators. The structural parameters are as follows: Figure 5 shown.

[0043] Step 2.2, determine the level table of cutter head influencing factors. Table 1 Three-plate cutter disc structural parameter factors-level table

[0044] Step 2.3, through orthogonal test design, determine the parameter combination of the three-plate cutterhead of the full-section rock tunnel boring machine with uniform deformation, and determine the test plan of the three-plate cutterhead of the full-section rock tunnel boring machine. Table 2 Orthogonal test scheme for three-plate cutterhead structural parameters

[0045] Step 3: Establish a three-dimensional model of the three-plate cutterhead of the full-section rock tunnel boring machine according to the test plan, and perform finite element simulation.

[0046] Specifically, step 3 specifically includes steps 3.1 to 3.4.

[0047] Step 3.1, establish a three-dimensional model according to the three-plate cutterhead test plan of the full-section rock tunnel boring machine.

[0048] Step 3.2, import the 3D model into the finite element software, set the mesh and cutter head properties, select global type of mesh division, use tetrahedron as the mesh shape, use ten-node quadratic tetrahedron element as the unit type, automatically divide the mesh, the cutter head material is Q345, the density is 7850m / kg, the Young's modulus is 206Gpa, and the Poisson's ratio is 0.26.

[0049] Step 3.3, set the analysis step, where the analysis step is set to static and linear perturbation.

[0050] Step 3.4, the boundary condition of the cutter head front plate (1) is a concentrated load, the cutter head support (6) is set to a completely fixed constraint, and the concentrated load is 260KN.

[0051] Step 3.5, create a job module and submit the job.

[0052] Step 4: Based on the deformation variables and standard deviations of each cutterhead scheme obtained by finite element simulation (Table 3, Table 4), a curve chart is drawn according to the horizontal scheme ( Figure 6 , 7 , 8, 9, 10), determine the optimal cutter disc solution, and the cutter disc 25 design solution has better uniformity. Table 3 Deformation of three-plate cutter disc for each scheme / mm Table 4 Deformation of three-plate cutter disc for each scheme / mm

[0053] Step 5: Obtain the cutterhead structure based on the index parameter formula and the range formula, compare and analyze with the better cutterhead, determine the optimal cutterhead structure design, and define the index parameter k according to the orthogonal test. i , wherein the thickness of the cutter disc front plate (1), the thickness of the cutter disc middle plate (2), the thickness of the cutter disc connecting plate (3), the distance between the cutter disc front plate (1) and the cutter disc middle plate (2), the distance between the cutter disc connecting plate (3) and the cutter disc middle plate (2), and the cutter disc support plate diameter ratio are respectively recorded as (Calculation formulas are shown in formulas 4 to 9), where the range of the index parameter ΔK is defined, where the range of the thickness of the cutter disc front plate (1), the thickness of the cutter disc middle plate (2), the thickness of the cutter disc connecting plate (3), the distance between the cutter disc front plate (1) and the cutter disc middle plate (2), the distance between the cutter disc connecting plate (3) and the cutter disc middle plate (2), and the cutter disc support plate diameter ratio are respectively (Calculation formula see formula 10), the results are shown in Table 5, according to the cutter head deformation extreme difference analysis, under concentrated load: Therefore, it can be known that the order of factors affecting the deformation of the cutter disc is: cutter disc support disc diameter ratio R0 / R> cutter disc middle plate thickness δ2> cutter disc front plate thickness δ1> distance t1 between the cutter disc front plate and the cutter disc middle plate> cutter disc connecting plate thickness δ3> distance y2 between the cutter disc middle plate and the cutter disc middle plate. Table 5 Range Analysis / mm

[0054] From Table 5, we can get The corresponding three-plate cutter disc structural parameters are shown in Table 6. Table 6 Three-plate cutter disc structural parameters (extreme difference analysis scheme) (ΔK=max{k i}-min{k i}(i=1,2,3,4,5) (10)

[0055] Compare the range analysis scheme with Scheme 25, such as Fig.11 As shown in the figure, the average deformation of the cutterhead scheme obtained by the range analysis is generally smaller than that of scheme 25, and the standard deviation of this scheme (σ=0.0478) is also smaller than the standard deviation of scheme 25 (σ=0.0480). Therefore, the structural parameters of the three-plate cutterhead under concentrated load are as follows: the thickness of the cutterhead front plate (1) is 100 mm, the thickness of the cutterhead middle plate (2) is 100 mm, the thickness of the cutterhead connecting plate (3) is 50 mm (in accordance with the theory of elastic deformation and thickness determination of the cutterhead connecting plate), the distance between the cutterhead front plate (1) and the cutterhead middle plate (2) is 500 mm, the distance between the cutterhead connecting plate (3) and the cutterhead middle plate (2) is 850 mm, and the cutterhead support plate diameter ratio is 0.5 (in accordance with the cutterhead support stiffness theory). The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A three-plate cutterhead design method for a full-face rock tunnel boring machine, characterized in that: The structural theory includes the cutter disc panel deflection theory obtained from the elastic mechanics theory, the cutter disc connecting plate elastic deformation and thickness determination theory and the cutter disc support stiffness theory. The design method is to reasonably determine the thickness of the cutter disc front plate (1), the cutter disc middle plate (2) and the cutter disc connecting plate (3), the distance between the cutter disc front plate (1) and the cutter disc middle plate (2), the distance between the cutter disc connecting plate (3) and the cutter disc middle plate (2), and the cutter disc support disc diameter ratio, that is, the ratio of the cutter disc radius to the cutter disc support (6) radius.

2. A three-plate cutterhead design method for a full-face rock tunnel boring machine according to claim 1, characterized in that: The structural theory includes the theoretical formula of the cutter head panel deflection obtained from the elastic mechanics theory: Where: w-cutterhead deflection; q-surface load acting on the cutterhead, determined by the surrounding rock conditions, the number of disc cutters on the cutterhead and the penetration rate; R0-cutterhead support radius; r-distance from a point on the cutterhead mid-plane to the z-axis (polar diameter); D-cutterhead bending stiffness, D = Wherein, E is Young's elastic modulus of the cutter disc material, t is the thickness of the cutter disc, and μ is the Poisson's ratio of the cutter disc material.

3. A three-plate cutterhead design method for a full-face rock tunnel boring machine according to claim 1, characterized in that: The elastic deformation of the cutter disc connecting plate (3) and its thickness determination theory are used to deduce the cutter disc connecting plate deflection equation (Formula 1) through the cutter disc panel deflection equation: Where: D l - Bending stiffness of the cutterhead connection plate, δ3-cutting disc connecting plate thickness; R-cutting disc radius.

4. A three-plate cutterhead design method for a full-face rock tunnel boring machine according to claim 1, characterized in that: The cutter disc support stiffness theory states that the cutter disc is supported behind the cutter disc, plays the role of supporting the cutter disc and bearing the torque and thrust from the cutter disc. Based on the elastic mechanics theory, the relationship between the cutter disc radius and its support radius when the cutter disc support stiffness is optimal is established. The equation is as follows: The simplified value is 0.5R~0.8R.

5. A three-plate cutterhead design method for a full-face rock tunnel boring machine according to claim 1, characterized in that: The design method reasonably determines the thickness of the cutter disc front plate (1), the cutter disc middle plate (2) and the cutter disc connecting plate (3), the distance between the cutter disc front plate (1) and the cutter disc middle plate (2), the distance between the cutter disc connecting plate (3) and the cutter disc middle plate (2), and the cutter disc support disc diameter ratio, i.e., the ratio of the cutter disc radius to the cutter disc support radius. The specific design steps are as follows: Step 1, according to the structure of the three-plate cutterhead, the main factors affecting the deformation of the three-plate cutterhead of the full-face rock tunnel boring machine are determined: the thickness δ1 of the cutterhead front plate (1), the thickness δ2 of the cutterhead middle plate (2), the thickness δ3 of the cutterhead connecting plate (3), the distance t1 between the cutterhead front plate (1) and the cutterhead middle plate (2), the distance t2 between the cutterhead connecting plate (3) and the cutterhead middle plate (2), and the cutterhead support disc diameter ratio R0 / R, that is, R0 is the cutterhead support radius, and R is the cutterhead radius; Step 2, design an orthogonal test based on the main factors of the three-plate cutter head deformation and determine the test plan; Step 3, establishing a three-dimensional model of each scheme of the three-plate cutterhead of the full-section rock tunnel boring machine according to the test scheme, and performing finite element simulation; Step 4, determining the optimal cutterhead solution based on the deformation variables and standard deviations of each cutterhead solution obtained by finite element simulation; Step 5, obtain the cutterhead structure according to the index parameter formula and the range formula, compare and analyze it with the better cutterhead, and determine the optimal cutterhead structure design scheme.

6. A three-plate cutterhead design method for a full-face rock tunnel boring machine according to claim 5, characterized in that: Step 2 specifically includes: Step 2.1, determine the thickness δ1 of the cutter disc front plate (1), the thickness δ2 of the cutter disc middle plate (2), the thickness δ3 of the cutter disc connecting plate (3), the distance t1 between the cutter disc front plate (1) and the cutter disc middle plate (2), the distance t2 between the cutter disc connecting plate (3) and the cutter disc middle plate (2), and the cutter disc support plate diameter ratio R0 / R as test indicators; Step 2.2, determine the level table of factors affecting the cutter head; Step 2.3, through orthogonal test design, determine the parameter combination of the three-plate cutterhead of the full-section rock tunnel boring machine with uniform deformation, and determine the test plan of the three-plate cutterhead of the full-section rock tunnel boring machine.

7. A three-plate cutterhead design method for a full-face rock tunnel boring machine according to claim 5, characterized in that: Step 3 specifically includes: Step 3.1, establish a three-dimensional numerical model according to the three-plate cutterhead test plan of the full-face rock tunnel boring machine; Step 3.2, import the three-dimensional numerical model into the finite element software and set the mesh and cutterhead properties; Step 3.3, set the analysis step, where the analysis step is set to static and linear perturbation; Step 3.4, the boundary condition of the cutter head front plate (1) is a concentrated load, and the cutter head support (6) is set to a completely fixed constraint; Step 3.5, create a job module and submit the job.

8. The method for designing a three-plate cutterhead for a full-face rock tunnel boring machine according to claim 1, characterized in that: The cutter disc comprises a hob seat (4), a cutter disc front plate (1), a cutter disc middle plate, a cutter disc connecting plate (3), a cutter disc support (6) and a supporting rib (5); the cutter disc front plate (1) and the cutter disc middle plate (2) are welded together via the hob seat (4); the cutter disc connecting plate (3) and the cutter disc middle plate (2) are welded together via the supporting rib (5); and the cutter disc connecting plate (3) and the cutter disc support (6) are welded together.

9. A three-plate cutterhead design method for a full-face rock tunnel boring machine according to claim 1, characterized in that: The thickness of the cutter disc front plate (1) is 100 mm; the thickness of the cutter disc middle plate (2) is 100 mm; the thickness of the cutter disc connecting plate (3) is 50 mm; the distance between the cutter disc front plate (1) and the cutter disc middle plate (2) is 500 mm; the thickness of the cutter disc connecting plate (3) and the middle plate (2) is 850 mm; and the cutter disc support plate diameter ratio is 0.

5.

10. A three-plate cutterhead design method for a full-face rock tunnel boring machine according to claim 1, characterized in that: The cutter disc front plate (1) is a whole plate structure.

11. A method for designing a three-plate cutterhead for a full-face rock tunnel boring machine according to claim 1, characterized in that: The cutter disc middle plate (2) is a whole plate structure.

12. A method for designing a three-plate cutterhead for a full-face rock tunnel boring machine according to claim 1, characterized in that: The cutter disc connecting plate (3) is a whole plate structure.

Images