Method and device for calculating stress and deformation of deep-buried circular composite lining tunnel

Abstract

The present application relates to a kind of deep-buried circular composite lining tunnel stress deformation calculation method and device.The existing tunnel lining stress deformation calculation ignores the interaction between surrounding rock and primary support, primary support and secondary lining. The method obtains the extrusion stress of composite lining tunnel from surrounding rock;Using extrusion stress and the design parameters of composite lining, the radial force on each contact surface in composite lining is calculated;Using deformation parameters and the radial force on contact surface, the radial normal stress, hoop shear stress and radial displacement of primary support, secondary lining and surrounding rock are calculated respectively. The method of the present application first considers the interaction between surrounding rock and primary support, primary support and secondary lining in the process of stress deformation calculation, introduces calculation model, so that the calculation result is more in line with reality, more reasonable and more accurate, which is of great significance to ensure construction and operation safety.

Description

Technical Field

[0001] This invention relates to the field of tunnel engineering technology, specifically to a method and apparatus for calculating the stress and deformation of a deeply buried circular composite lining tunnel. Background Technology

[0002] Deeply buried tunnels under complex geological conditions bear significant ground and water pressure. In engineering practice, composite lining structures are often used during construction to improve the stress conditions of the outer support layer and prevent rock instability and collapse. Composite lining comprises two main structures and is a relatively reasonable structural form in tunnel engineering, suitable for various surrounding rock geological conditions. In the design and construction of composite-lined tunnels, the calculation of stress and deformation of the composite lining is extremely critical and of great significance for ensuring construction and operational safety. The outer layer of the composite lining is the initial support, which reinforces the surrounding rock, controls its deformation, and prevents it from loosening and becoming unstable. It is the main load-bearing unit in the lining structure, and a certain degree of deformation is allowed after its construction. The inner layer of the composite lining is the secondary lining, constructed after the surrounding rock deformation has basically stabilized. Therefore, the stress and deformation process of the composite lining is not only dynamic but also complex, requiring the establishment of a reasonable calculation model for numerical estimation.

[0003] Composite linings involve two contact surfaces: the contact surface between the surrounding rock and the initial support, and the contact surface between the initial support and the secondary lining. Both surfaces interact with each other. However, current stress-deformation calculation models for composite linings generally only consider the interaction between the initial support and the secondary lining. The surrounding rock load is calculated based on the surrounding rock condition and tunnel geometry parameters, neglecting the interaction between the surrounding rock and the initial support. This is equivalent to introducing a constant into the calculation model, resulting in inaccurate calculation results and biased guidance for design and construction, requiring further improvement. Summary of the Invention

[0004] The purpose of this invention is to provide a method and apparatus for calculating the stress and deformation of a deeply buried circular composite lining tunnel, so as to solve the problem that the interaction between the surrounding rock and the initial support is ignored in the calculation process of existing methods.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A method for calculating the stress and deformation of a deeply buried circular composite-lined tunnel, the method comprising:

[0007] Obtain the compressive stress from the surrounding rock experienced by the composite-lined tunnel;

[0008] Using compressive stress and design parameters of composite lining, the radial forces on each contact surface within the composite lining are calculated.

[0009] Using the deformation parameters of the initial support and the radial force on the contact surface, the radial normal stress, circumferential shear stress and radial displacement of the initial support are calculated.

[0010] Using the deformation parameters of the secondary lining and the radial force on the contact surface, the radial normal stress, circumferential shear stress and radial displacement of the secondary lining are calculated.

[0011] Using the deformation parameters of the surrounding rock and the radial force on the contact surface, the radial normal stress, circumferential shear stress and radial displacement of the surrounding rock are calculated.

[0012] Furthermore, the composite lining tunnel is a deep-buried circular composite lining tunnel under hydrostatic pressure.

[0013] Furthermore, the design parameters of the composite lining include the inner radius of the secondary lining, the outer radius of the secondary lining (i.e., the inner radius of the initial support), and the outer radius of the initial support.

[0014] Furthermore, each contact surface includes the contact surface between the surrounding rock and the initial support, and the contact surface between the initial support and the secondary lining.

[0015] Furthermore, using the compressive stress and design parameters of the composite lining, the radial forces on each contact surface within the composite lining are calculated, including:

[0016] Obtain the inner radius a of the secondary lining, the outer radius of the secondary lining (i.e., the inner radius b of the initial support), and the outer radius c of the initial support.

[0017] Considering the interaction between the surrounding rock and the composite lining, imagine a ring of the surrounding rock at a radius d, where d >> c. According to Lamé's solution, the radial displacement u of the surrounding rock... ρR for:

[0018]

[0019] in:

[0020] r is the polar radius;

[0021] q b The radial force at the interface between the initial support and the secondary lining;

[0022] q c The radial force at the interface between the surrounding rock and the initial support;

[0023] q represents the compressive stress of the surrounding rock;

[0024] μ R The elastic modulus of the surrounding rock;

[0025] E R The Poisson's ratio of the surrounding rock;

[0026] Radial displacement u of initial support ρL1 for:

[0027]

[0028] in:

[0029] μ L1 Poisson's ratio for initial support;

[0030] E L1 The elastic modulus of the initial support;

[0031] Radial displacement u of secondary lining ρL2 for:

[0032]

[0033] in:

[0034] μ L2 Poisson's ratio for secondary lining;

[0035] E L2 The elastic modulus of the secondary lining;

[0036] At r = c, u ρR =u ρL1 ,but:

[0037]

[0038] At r = b, u ρL1 =u ρL2 ,but:

[0039]

[0040] By combining the equations and letting d approach infinity, we obtain the radial force q at the contact surface between the surrounding rock and the initial support. c Radial force q at the interface between the initial support and the secondary lining b .

[0041] Furthermore, using the deformation parameters of the initial support and the radial force on the contact surface, the radial normal stress, circumferential shear stress, and radial displacement of the initial support are calculated, including:

[0042] The deformation parameters of the initial support include the elastic modulus E of the initial support. L1 Poisson's ratio μ for initial support L1 ;

[0043] Radial normal stress σ of initial support ρL1 for:

[0044]

[0045] in:

[0046] r is the extreme radius. For initial support, b≤r≤c;

[0047] Circumferential shear stress of initial support for:

[0048]

[0049] Radial displacement u of initial support ρL1 for:

[0050]

[0051] Furthermore, using the deformation parameters of the secondary lining and the radial force on the contact surface, the radial normal stress, circumferential shear stress, and radial displacement of the secondary lining are calculated, including:

[0052] The deformation parameters of secondary lining include the elastic modulus E of the secondary lining. L2 Poisson's ratio μ of secondary lining L2 ;

[0053] Radial normal stress σ of secondary lining ρL2 for:

[0054]

[0055] in:

[0056] r is the extreme radius; for secondary lining, a≤r≤b.

[0057] Circumferential shear stress of secondary lining for:

[0058]

[0059] Radial displacement u of secondary lining ρL2 for:

[0060]

[0061] Furthermore, using the deformation parameters of the surrounding rock and the radial force on the contact surface, the radial normal stress, circumferential shear stress, and radial displacement of the surrounding rock are calculated, including:

[0062] The deformation parameters of the surrounding rock include the elastic modulus E of the surrounding rock. R Poisson's ratio μ of the surrounding rock R ;

[0063] Radial normal stress σ of surrounding rock ρR for:

[0064]

[0065] in:

[0066] r is the polar radius; for the surrounding rock, r ≥ c.

[0067] Circumferential shear stress of surrounding rock for:

[0068]

[0069] radial displacement u of the surrounding rock ρR for:

[0070]

[0071] On the other hand, a stress and deformation calculation device for a deeply buried circular composite lining tunnel is provided, the device being used to implement the method, including:

[0072] The compressive stress acquisition and calculation module is used to obtain the compressive stress from the surrounding rock experienced by the composite lining tunnel;

[0073] The contact surface interaction force calculation module is used to calculate the radial force on each contact surface in the composite lining using the compressive stress and the design parameters of the composite lining.

[0074] The initial support stress and deformation calculation module is used to calculate the radial normal stress, circumferential shear stress and radial displacement of the initial support by using the deformation parameters of the initial support and the radial force on the contact surface.

[0075] The secondary lining stress and deformation calculation module is used to calculate the radial normal stress, circumferential shear stress and radial displacement of the secondary lining using the deformation parameters of the secondary lining and the radial force on the contact surface.

[0076] The surrounding rock stress and deformation calculation module is used to calculate the radial normal stress, circumferential shear stress and radial displacement of the surrounding rock using the deformation parameters of the surrounding rock and the radial force on the contact surface.

[0077] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0078] The method of this invention is applicable to the stress and deformation calculation of composite-lined tunnels. It can solve the stress and displacement of the surrounding rock, initial support, and secondary lining in a deeply buried circular composite-lined tunnel under hydrostatic pressure. For the first time, the interaction force between the surrounding rock and the initial support is considered in the stress and deformation calculation process. After obtaining the compressive stress from the surrounding rock on the composite-lined tunnel, the radial force on each contact surface within the composite lining is calculated using the compressive stress and the design parameters of the composite lining. This reveals the interaction force between the surrounding rock and the initial support, and between the initial support and the secondary lining. Introducing this into the calculation model makes the calculation results more realistic, reasonable, and accurate. Attached Figure Description

[0079] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of this invention or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this invention. For those skilled in the art, other embodiments can be obtained from these drawings without creative effort.

[0080] Figure 1 This is a schematic diagram of the stress analysis of a deeply buried circular composite lining tunnel under hydrostatic pressure.

[0081] Figure 2 This is a flowchart of the method of the present invention.

[0082] Figure 3 This is a schematic diagram of the radial normal stress (MPa) distribution in a secondary lining.

[0083] Figure 4 This is a schematic diagram of the circumferential normal stress (MPa) distribution in the secondary lining.

[0084] Figure 5 This is a schematic diagram of the radial displacement (m) distribution of the secondary lining. Detailed Implementation

[0085] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0086] It should be noted that similar reference numerals and letters indicate similar items; therefore, once an item is defined in one embodiment, it does not need to be further defined and explained in subsequent embodiments. Furthermore, the terms "comprising" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or modules is not necessarily limited to those steps or modules explicitly listed, but may include other steps or modules not explicitly listed or inherent to such processes, methods, products, or devices.

[0087] Furthermore, the steps "S1", "S2", etc. involved in the embodiments of the present invention are only for the convenience of describing the technical solution and for understanding the specific steps and contents of the embodiments. They should not be construed as a limitation on the order of steps. Any change in the order of steps should be within the protection scope of the present invention.

[0088] This invention provides a method for calculating the stress and deformation of a deeply buried circular composite lining tunnel, applicable to the calculation of stress and deformation of a deeply buried circular composite lining tunnel under hydrostatic pressure. The calculation model not only involves the interaction force between the initial support and the secondary lining, but also considers the interaction force between the surrounding rock and the initial support, resulting in more reasonable and reliable calculation results.

[0089] Stress analysis of deeply buried circular composite-lined tunnels as follows Figure 1 As shown in the figure, q is the compressive stress of the surrounding rock on the deep-buried tunnel, a is the inner radius of the secondary lining, b is the outer radius of the secondary lining (inner radius of the initial support), and c is the outer radius of the initial support.

[0090] like Figure 2 The method specifically includes the following steps, which can be executed on a computer system such as a set of computer-executable instructions, and although the logical order is shown in the flowchart, in some cases, they can be executed in a different order:

[0091] Deeply buried circular composite lining tunnel under hydrostatic pressure, such as Figure 1 As shown. q is the compressive stress of the surrounding rock on the deeply buried tunnel, which can be calculated using specifications. a is the inner radius of the secondary lining, b is the outer radius of the secondary lining (inner radius of the initial support), and c is the outer radius of the initial support. Using Lamé's solution, the radial force q between the initial support and the surrounding rock can be calculated. c The radial force q between the secondary lining and the initial support b This allows us to determine the stress and displacement of the tunnel surrounding rock, initial support, and secondary lining.

[0092] S1: Obtain the compressive stress from the surrounding rock on the composite lining tunnel. The compressive stress q from the surrounding rock on the composite lining tunnel can be obtained according to various algorithms in the specification.

[0093] S2: Calculate the radial forces on each contact surface within the composite lining using compressive stress and the design parameters of the composite lining. The design parameters of the composite lining include the inner radius of the secondary lining, the outer radius of the secondary lining (i.e., the inner radius of the initial support), and the outer radius of the initial support. Each contact surface includes the contact surface between the surrounding rock and the initial support, and the contact surface between the initial support and the secondary lining. This step includes:

[0094] S201: Obtain the inner radius a of the secondary lining, the outer radius b of the secondary lining (i.e., the inner radius of the initial support), and the outer radius c of the initial support.

[0095] S202: Considering the interaction between the surrounding rock and the composite lining, take a ring around the surrounding rock at a radius d, where d >> c.

[0096] According to Lamé's solution, the radial displacement u of the surrounding rock ρR for:

[0097]

[0098] in:

[0099] r is the polar radius;

[0100] q b The radial force at the interface between the initial support and the secondary lining;

[0101] q c The radial force at the interface between the surrounding rock and the initial support;

[0102] q represents the compressive stress of the surrounding rock;

[0103] μ R The elastic modulus of the surrounding rock;

[0104] E R The Poisson's ratio of the surrounding rock;

[0105] Radial displacement u of initial support ρL1 for:

[0106]

[0107] in:

[0108] μ L1 Poisson's ratio for initial support;

[0109] E L1 The elastic modulus of the initial support;

[0110] Radial displacement u of secondary lining ρL2 for:

[0111]

[0112] in:

[0113] μ L2 Poisson's ratio for secondary lining;

[0114] E L2 The elastic modulus of the secondary lining;

[0115] S203: At r = c, u ρR =u ρL1 ,but:

[0116]

[0117] At r = b, u ρL1 =u ρL2 ,but:

[0118]

[0119] S204: By solving the two equations simultaneously and letting d approach infinity, the radial force q at the interface between the surrounding rock and the initial support is obtained. c The radial force q at the contact surface between the initial support and the secondary lining b .

[0120] S3: Using the deformation parameters of the initial support and the radial force on the contact surface, calculate the radial normal stress, circumferential shear stress, and radial displacement of the initial support, including:

[0121] S301: The deformation parameters of the initial support include the elastic modulus E of the initial support. L1 Poisson's ratio μ for initial support L1 ;

[0122] S302: Radial normal stress σ of the initial support ρL1 for:

[0123]

[0124] in:

[0125] r is the extreme radius. For initial support, b≤r≤c;

[0126] S303: Circumferential shear stress in the initial support for:

[0127]

[0128] S304: Radial displacement of initial support u ρL1 for:

[0129]

[0130] S4: Using the deformation parameters of the secondary lining and the radial force on the contact surface, calculate the radial normal stress, circumferential shear stress, and radial displacement of the secondary lining, including:

[0131] S401: The deformation parameters of the secondary lining include the elastic modulus E of the secondary lining. L2 Poisson's ratio μ of secondary lining L2 ;

[0132] S402: Radial normal stress σ of the secondary lining ρL2 for:

[0133]

[0134] in:

[0135] r is the extreme radius; for secondary lining, a≤r≤b.

[0136] S403: Circumferential shear stress of secondary lining for:

[0137]

[0138] S404: Radial displacement u of the secondary lining ρL2 for:

[0139]

[0140] S5: Using the deformation parameters of the surrounding rock and the radial force on the contact surface, calculate the radial normal stress, circumferential shear stress, and radial displacement of the surrounding rock, including:

[0141] S501: The deformation parameters of the surrounding rock include the elastic modulus E of the surrounding rock. R Poisson's ratio μ of the surrounding rock R ;

[0142] S502: Radial normal stress σ of the surrounding rock ρR for:

[0143]

[0144] in:

[0145] r is the polar radius; for the surrounding rock, r ≥ c.

[0146] S503: Circumferential shear stress of the surrounding rock for:

[0147]

[0148] S504: Radial displacement u of the surrounding rock ρR for:

[0149]

[0150] Both the elastic modulus and Poisson's ratio can be obtained from tables in the specifications.

[0151] In addition, the present invention also provides a stress and deformation calculation device for a deeply buried circular composite lining tunnel, used to implement the above method, including:

[0152] The compressive stress acquisition and calculation module is used to acquire the compressive stress from the surrounding rock experienced by the composite lining tunnel, corresponding to S1 in the above method;

[0153] The contact surface interaction force calculation module is used to calculate the radial force on each contact surface in the composite lining using the compressive stress and the design parameters of the composite lining, corresponding to S2 in the above method;

[0154] The initial support stress and deformation calculation module is used to calculate the radial normal stress, circumferential shear stress and radial displacement of the initial support using the deformation parameters of the initial support and the radial force on the contact surface, corresponding to S3 in the above method.

[0155] The secondary lining stress and deformation calculation module is used to calculate the radial normal stress, circumferential shear stress and radial displacement of the secondary lining using the deformation parameters of the secondary lining and the radial force on the contact surface, corresponding to S4 in the above method.

[0156] The surrounding rock stress and deformation calculation module is used to calculate the radial normal stress, circumferential shear stress and radial displacement of the surrounding rock using the deformation parameters of the surrounding rock and the radial force on the contact surface, corresponding to S5 in the above method.

[0157] Those skilled in the art will understand that all or part of the functions of the embodiments of the present invention can be implemented by hardware or by computer program. When all or part of the functions in the above embodiments are implemented by computer program, the program can be stored in a computer-readable storage medium, which may include: read-only memory, random access memory, disk, optical disk, hard disk, etc., and the program is executed by a computer to achieve the above functions. For example, the program can be stored in the memory of a device, and when the program in the memory is executed by the processor, all or part of the above functions can be achieved. In addition, when all or part of the functions in the above embodiments are implemented by computer program, the program can also be stored in a storage medium such as a server, another computer, disk, optical disk, flash drive, or portable hard drive, and can be downloaded or copied to the memory of a local device, or the system of the local device can be updated. When the program in the memory is executed by the processor, all or part of the functions in the above embodiments can be achieved.

[0158] This method can solve the stress and displacement of deeply buried circular composite lining tunnels, shafts, shield tunnels, surrounding rock, initial support, and secondary lining under hydrostatic pressure, as well as the stress and displacement of all structures with components whose size is more than 5 times the size of the circular hole and whose circular hole opening has double-layer reinforcement.

[0159] Example:

[0160] The method of the present invention will be further described in detail below through specific examples:

[0161] First, calculate the compressive stress of the surrounding rock on the deeply buried tunnel:

[0162] q = 0.2 MPa

[0163] To obtain the design parameters for the composite lining, the inner radius of the secondary lining is a = 6m, the outer radius is b = 6.5m, and the outer radius of the initial support is c = 6.75m. The elastic modulus E of the initial support and secondary lining is also determined. L1 and E L2 The Poisson's ratio μ for the initial support and secondary lining are 23 GPa and 31.5 GPa, respectively. L1 and μ L2 Both are 0.2, the elastic modulus and Poisson's ratio E of the surrounding rock R and μ R The values ​​are 1.5 GPa and 0.4 GPa, respectively. As an example, Figure 3-5 The radial normal stress, circumferential normal stress, and radial displacement of the secondary lining are given.

[0164] The stresses and displacements of the tunnel surrounding rock, initial support, and secondary lining are shown in Table 1 below.

[0165] Table 1. Stress and displacement of tunnel surrounding rock, initial support, and secondary lining.

[0166]

[0167] It can be seen that at the contact point between the surrounding rock and the initial support (r=c) and at the contact point between the initial support and the secondary lining (r=b), the radial displacement and radial normal stress are equal. The force acting on the outside of the initial support is not the same as the load on the surrounding rock. Therefore, the interaction between the surrounding rock and the initial support cannot be ignored. Considering only the interaction between the initial support and the secondary lining, the surrounding rock load is calculated based on the surrounding rock condition and tunnel geometric parameters. The calculation results cannot be accurate. This method effectively overcomes this defect and can obtain more accurate calculation results, which is beneficial for design and construction guidance.

[0168] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.

Claims

1. A method for calculating the stress and deformation of a deeply buried circular composite lining tunnel, characterized in that: The method includes: Obtain the compressive stress from the surrounding rock experienced by the composite-lined tunnel; Using compressive stress and design parameters of the composite lining, the radial forces on each contact surface within the composite lining are calculated, including: Obtain the inner radius of the secondary lining The outer radius of the secondary lining is the same as the inner radius of the initial support. Outer radius of initial support ; Considering the interaction between the surrounding rock and the composite lining, imagine a ring of the surrounding rock at a radius d, where d >> c. According to Lamé's solution, the radial displacement of the surrounding rock... for: ； in: Polar radius; The radial force at the interface between the initial support and the secondary lining; The radial force at the interface between the surrounding rock and the initial support; This refers to the compressive stress of the surrounding rock. The Poisson's ratio of the surrounding rock; The elastic modulus of the surrounding rock; Radial displacement of initial support for: ； in: Poisson's ratio for initial support; The elastic modulus of the initial support; Radial displacement of secondary lining for: ； in: Poisson's ratio for secondary lining; The elastic modulus of the secondary lining; At r=c, ,but: ； At r=b, ,but: By combining the equations and letting d approach infinity, we obtain the radial force at the contact surface between the surrounding rock and the initial support. Radial force at the interface between the initial support and the secondary lining ; Using the deformation parameters of the initial support and the radial force on the contact surface, the radial normal stress, circumferential shear stress and radial displacement of the initial support are calculated. Using the deformation parameters of the secondary lining and the radial force on the contact surface, the radial normal stress, circumferential shear stress and radial displacement of the secondary lining are calculated. Using the deformation parameters of the surrounding rock and the radial force on the contact surface, the radial normal stress, circumferential shear stress and radial displacement of the surrounding rock are calculated.

2. The method for calculating the stress and deformation of a deeply buried circular composite lining tunnel according to claim 1, characterized in that: The composite lining tunnel is a deep-buried circular composite lining tunnel under hydrostatic pressure.

3. The method for calculating the stress and deformation of a deeply buried circular composite lining tunnel according to claim 2, characterized in that: The design parameters of the composite lining include the inner radius of the secondary lining, the outer radius of the secondary lining (i.e., the inner radius of the initial support), and the outer radius of the initial support.

4. The method for calculating the stress and deformation of a deeply buried circular composite lining tunnel according to claim 3, characterized in that: The contact surfaces include the contact surface between the surrounding rock and the initial support, and the contact surface between the initial support and the secondary lining.

5. The method for calculating the stress and deformation of a deeply buried circular composite lining tunnel according to claim 4, characterized in that: Using the deformation parameters of the initial support and the radial force on the contact surface, the radial normal stress, circumferential shear stress, and radial displacement of the initial support are calculated, including: The deformation parameters of the initial support include the elastic modulus of the initial support. Poisson's ratio of initial support ; Radial normal stress of initial support for: ； in: For initial support, the diameter is the extreme diameter. ; Circumferential shear stress of initial support for: 。 6. The method for calculating the stress and deformation of a deeply buried circular composite lining tunnel according to claim 5, characterized in that: Using the deformation parameters of the secondary lining and the radial force on the contact surface, the radial normal stress, circumferential shear stress, and radial displacement of the secondary lining are calculated, including: The deformation parameters of secondary lining include the elastic modulus of the secondary lining. Poisson's ratio of secondary lining ; Radial normal stress of secondary lining for: ； in: For secondary lining, where the radius is the extreme diameter, ; Circumferential shear stress of secondary lining for: 。 7. The method for calculating the stress and deformation of a deeply buried circular composite lining tunnel according to claim 6, characterized in that: Using the deformation parameters of the surrounding rock and the radial force on the contact surface, the radial normal stress, circumferential shear stress, and radial displacement of the surrounding rock are calculated, including: The deformation parameters of the surrounding rock include the elastic modulus of the surrounding rock. Poisson's ratio of the surrounding rock ; Radial normal stress of surrounding rock for: ； in: For the surrounding rock, the extreme diameter is... ; Circumferential shear stress of surrounding rock for: ； radial displacement of surrounding rock for: 。 8. A stress and deformation calculation device for deeply buried circular composite lining tunnels, characterized in that: The apparatus is used to implement the method according to any one of claims 1-7, comprising: The compressive stress acquisition and calculation module is used to obtain the compressive stress from the surrounding rock experienced by the composite lining tunnel; The contact surface interaction force calculation module is used to calculate the radial force on each contact surface in the composite lining using the compressive stress and the design parameters of the composite lining. The initial support stress and deformation calculation module is used to calculate the radial normal stress, circumferential shear stress and radial displacement of the initial support by using the deformation parameters of the initial support and the radial force on the contact surface. The secondary lining stress and deformation calculation module is used to calculate the radial normal stress, circumferential shear stress and radial displacement of the secondary lining using the deformation parameters of the secondary lining and the radial force on the contact surface. The surrounding rock stress and deformation calculation module is used to calculate the radial normal stress, circumferential shear stress and radial displacement of the surrounding rock using the deformation parameters of the surrounding rock and the radial force on the contact surface.

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