Buried power pipe gallery settlement calculation method considering side stratum friction

Abstract

The present application relates to a kind of burying electric power pipe gallery settlement calculation method considering side stratum friction, comprising the following steps: after obtaining stratum information, electric power pipe gallery burying condition and external load basic parameter, based on the settlement balance formula of external load caused by pressure stratum bearing, the structural deformation formula of external load transmission to electric power pipe gallery, establish the settlement deformation balance formula of buried electric power pipe gallery under pressure action;After obtaining the basic parameters of friction between structure and stratum, the stratum friction force formula of unit length electric power pipe gallery two sides is established, and then the settlement deformation balance formula of buried electric power pipe gallery under the action of two side friction is established, as the correction of the settlement deformation calculation result of buried electric power pipe gallery under the action of external load pressure;Iterative calculation is carried out to the above steps to obtain the final correction value of the settlement deformation of buried electric power pipe gallery under the action of external load pressure.

Description

Technical Field

[0001] This invention relates to a method for calculating the settlement of buried power utility tunnels that takes into account lateral ground friction, belonging to the field of underground building structure deformation prediction technology. Background Technology

[0002] Power utility tunnels are crucial structures for the layout and protection of power lines, meeting power transmission requirements and providing safe and reliable space for pipeline laying and maintenance. Buried power utility tunnels make full use of underground space, reducing the footprint on the surface and better isolating the structure from damage caused by surface activities. However, because buried power utility tunnels are located in shallow strata, surface and shallow loads act on the tunnel structure through the stratum medium, inevitably causing structural settlement accompanied by stratum compression deformation. Significant settlement deformation will affect the stability of the power utility tunnel structure, and in severe cases, may even destroy the tunnel structure, rendering it unusable.

[0003] Currently, most methods for calculating the settlement deformation of buried power utility tunnels are based on elastic foundation beam models. These models assign the tunnel's cross-sectional properties to the foundation beam and calculate the structural deformation caused by external loads acting directly on the beam through the ground. However, actual power utility tunnel structures have large axial sidewall areas, and the additional deformation caused by friction between the walls and the ground during settlement is not negligible. This leads to discrepancies between the calculated results and actual settlement values, and the accuracy of the calculations needs further improvement. Establishing a corrected calculation method for the settlement of buried power utility tunnels that can consider the frictional forces exerted on the sidewalls by the ground is of significant theoretical and engineering importance. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention proposes a method for calculating the settlement of buried power utility tunnels that considers lateral ground friction.

[0005] The technical solution of the present invention is as follows:

[0006] On the one hand, the present invention provides a method for calculating the settlement of buried power utility tunnels considering lateral ground friction, comprising the following steps:

[0007] Collect information on the strata, the location of the power utility tunnel, and the basic parameters of the external load on the strata. Based on the above information, calculate the settlement caused by the external load on the strata. Then, based on the settlement, calculate the settlement deformation of the power utility tunnel buried in the strata under the action of the external load pressure. Finally, calculate the relative settlement between the power utility tunnel and the strata on the side of the power utility tunnel using the settlement deformation of the power utility tunnel and the settlement of the strata on the side of the power utility tunnel.

[0008] The basic frictional parameters between the power utility tunnel and the stratum are collected, and the frictional force on both sides of the power utility tunnel is calculated based on the relative settlement between the power utility tunnel and the stratum on the side. The settlement deformation of the power utility tunnel buried in the stratum under the action of external load pressure and the frictional force on both sides of the power utility tunnel are combined to calculate the settlement deformation of the power utility tunnel buried in the stratum under the action of frictional force on both sides.

[0009] The above steps are iterated, and the settlement deformation of the power pipeline buried in the stratum under the action of friction on both sides in the previous iteration is used as the correction value of the settlement deformation of the power pipeline buried in the stratum under the action of external load pressure in the current iteration. Based on the correction value, the settlement deformation of the power pipeline buried in the stratum under the action of friction on both sides in the current iteration is calculated through the above steps.

[0010] A preset threshold for the accuracy of power utility tunnel settlement correction is set. If the difference between the correction values ​​obtained in this iteration and the previous iteration is less than the threshold for the accuracy of the power utility tunnel settlement correction, the iteration is stopped and the sum of the correction value of this iteration and the settlement deformation of the power utility tunnel buried in the stratum under the action of external load pressure is taken as the final correction value of the power utility tunnel settlement.

[0011] In a preferred embodiment of the present invention, the settlement u caused by the external load on the stratum is calculated by constructing a settlement equilibrium formula for the stratum under external load. s The specific formula is as follows:

[0012]

[0013] Where: q is the vertical distributed pressure on the stratum; k s G represents the foundation stiffness; G represents the shear modulus of the strata.

[0014] In a preferred embodiment of the present invention, a settlement deformation formula for a power utility tunnel buried in the stratum under external load pressure is constructed based on the settlement balance formula caused by the stratum bearing external load pressure. The settlement deformation u of the power utility tunnel buried in the stratum under external load pressure is then calculated using this formula. p The specific formula is as follows:

[0015]

[0016] in: The formula for structural deformation caused by external loads transferred to the power utility tunnel; EI is the structural bending stiffness of the power utility tunnel; B is the cross-sectional width of the power utility tunnel.

[0017] In a preferred embodiment of the present invention, the formula for calculating the relative settlement between the power utility tunnel and the adjacent ground strata is: u r =|u p -us |

[0018] In a preferred embodiment of the present invention, the formula for calculating the ground friction force borne by the two sides of the power utility tunnel is as follows:

[0019]

[0020] Where: u r h represents the relative settlement between the power utility tunnel and the adjacent ground strata. f The relative friction height between the power utility tunnel and the adjacent ground strata; k, m, and R f γ represents the shear parameters at the contact surface between the power utility tunnel and the adjacent strata. w σ is the specific gravity of water. c P represents the normal stress at the contact surface between the power utility tunnel and the adjacent strata. a Atmospheric pressure; δ x The friction angle is the contact angle between the power utility tunnel and the adjacent ground strata.

[0021] As a preferred embodiment of the present invention, the settlement deformation amount u of the power utility tunnel buried in the stratum under the action of external load pressure is constructed by combining the settlement deformation formula of the power utility tunnel buried in the stratum under the action of friction on both sides of the stratum. f Calculation formula:

[0022]

[0023] In a preferred embodiment of the present invention, during any iteration process, both the power utility tunnel and the adjacent strata undergo equal and opposite deformations. Therefore, the relative settlement u between the power utility tunnel and the adjacent strata is... rn Based on the correction value u obtained in its previous iteration fn The calculation, specifically the formula, is: u rn =|u r -2u fn |

[0024] As a preferred embodiment of the present invention, the target power utility tunnel is divided into equal lengths using the finite difference method, and a set of difference equations for the deformation coordination center between each pipe section unit is established. The solution is obtained by using the boundary conditions at both ends of the overall power utility tunnel.

[0025] On the other hand, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method as described in any embodiment of the present invention.

[0026] In another aspect, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method described in any embodiment of the present invention.

[0027] The present invention has the following beneficial effects:

[0028] 1. The calculation method of this invention takes into account the combined effect of ground pressure and lateral friction on the settlement calculation of buried power utility tunnels, which improves the calculation accuracy and is more conducive to ensuring the reliability of settlement prediction results. It provides a reference for the refined design of structures and can provide great help to researchers and designers. Attached Figure Description

[0029] Figure 1 This is a flowchart of the method of the present invention.

[0030] Figure 2 This is a diagram showing the stress pattern of a representative cross-section of the buried power utility tunnel according to the present invention.

[0031] 1. Buried power cable tunnel; 2. Foundation spring. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] It should be understood that the step numbers used in the text are for ease of description only and are not intended to limit the order in which the steps are performed.

[0034] It should be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0035] The terms “comprising” and “including” indicate the presence of the described feature, whole, step, operation, element and / or component, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0036] The term “and / or” refers to any combination of one or more of the associated listed items, as well as all possible combinations, and includes these combinations.

[0037] Example 1:

[0038] See Figure 1 A method for calculating the settlement of buried power utility tunnels considering lateral ground friction includes the following steps:

[0039] Collect information on the strata, the location of the power utility tunnel, and the basic parameters of the external load on the strata. Based on the above information, calculate the settlement caused by the external load on the strata. Then, based on the settlement, calculate the settlement deformation of the power utility tunnel buried in the strata under the action of the external load pressure. Finally, calculate the relative settlement between the power utility tunnel and the strata on the side of the power utility tunnel using the settlement deformation of the power utility tunnel and the settlement of the strata on the side of the power utility tunnel.

[0040] The basic frictional parameters between the power utility tunnel and the stratum are collected, and the frictional force on both sides of the power utility tunnel is calculated based on the relative settlement between the power utility tunnel and the stratum on the side. The settlement deformation of the power utility tunnel buried in the stratum under the action of external load pressure and the frictional force on both sides of the power utility tunnel are combined to calculate the settlement deformation of the power utility tunnel buried in the stratum under the action of frictional force on both sides.

[0041] The above steps are iterated, and the settlement deformation of the power pipeline buried in the stratum under the action of friction on both sides in the previous iteration is used as the correction value of the settlement deformation of the power pipeline buried in the stratum under the action of external load pressure in the current iteration. Based on the correction value, the settlement deformation of the power pipeline buried in the stratum under the action of friction on both sides in the current iteration is calculated through the above steps.

[0042] A preset threshold for the accuracy of power utility tunnel settlement correction is set. If the difference between the correction values ​​obtained in this iteration and the previous iteration is less than the threshold for the accuracy of the power utility tunnel settlement correction, the iteration is stopped and the sum of the correction value of this iteration and the settlement deformation of the power utility tunnel buried in the stratum under the action of external load pressure is taken as the final correction value of the power utility tunnel settlement.

[0043] In a preferred embodiment of this invention, the settlement u caused by the external load on the stratum is calculated by constructing a settlement equilibrium formula for the stratum under external load. s The specific formula is as follows:

[0044]

[0045] Where: q is the vertical distributed pressure on the stratum; k s G represents the foundation stiffness; G represents the shear modulus of the strata.

[0046] In a preferred embodiment of this invention, a settlement deformation formula for a power utility tunnel buried in the stratum under external load pressure is constructed based on the settlement balance formula caused by the stratum bearing external load pressure. The settlement deformation u of the power utility tunnel buried in the stratum under external load pressure is then calculated using this formula.p The specific formula is as follows:

[0047]

[0048] in: The formula for structural deformation caused by external loads transferred to the power utility tunnel; EI is the structural bending stiffness of the power utility tunnel; B is the cross-sectional width of the power utility tunnel.

[0049] In a preferred embodiment of this invention, the formula for calculating the relative settlement between the power utility tunnel and the adjacent ground strata is: u r =|u p -u s |

[0050] In a preferred embodiment of this invention, the formula for calculating the ground friction force borne by the two sides of the power utility tunnel is as follows:

[0051]

[0052] Where: u r h represents the relative settlement between the power utility tunnel and the adjacent ground strata. f The relative friction height between the power utility tunnel and the adjacent ground strata; k, m, and R f γ represents the shear parameters at the contact surface between the power utility tunnel and the adjacent strata. w σ is the specific gravity of water. c P represents the normal stress at the contact surface between the power utility tunnel and the adjacent strata. a Atmospheric pressure; δ x The friction angle is the contact surface between the power utility tunnel and the adjacent stratum.

[0053] As a preferred embodiment of this invention, the settlement deformation amount u of the power utility tunnel buried in the stratum under external load pressure is constructed by combining the settlement deformation formula of the power utility tunnel buried in the stratum under the action of friction on both sides of the stratum. f Calculation formula:

[0054]

[0055] In a preferred embodiment of this invention, during any iteration, both the power utility tunnel and the adjacent ground strata undergo equal and opposite deformations. Therefore, the relative settlement u between the power utility tunnel and the adjacent ground strata is... rn Based on the correction value u obtained in its previous iteration fn The calculation, specifically the formula, is: u rn =|u r -2u fn |

[0056] As a preferred embodiment of this example, for solving the fourth-order differential equation, the target power utility tunnel is divided into equal lengths using the finite difference method, and a set of difference equations for the deformation coordination center between each pipe section unit is established. The solution is obtained by using the boundary conditions at both ends of the overall power utility tunnel.

[0057] In a preferred embodiment of this invention, the ground pressure q originates from the external pressure directly borne by the ground above the power utility tunnel structure. If the ground around the power utility tunnel is damaged or deformed due to nearby construction, such deformation can also be considered as external pressure applied to the ground above the structure.

[0058] In a preferred embodiment of this invention, the method for calculating the frictional force f is determined based on the friction medium, wherein the shear parameters k, m, and R at the contact surface between the power utility tunnel and the adjacent ground layer are determined. f Cocoa values ​​can be taken for concrete and soil materials, or determined by contact surface shear tests according to actual conditions.

[0059] This embodiment addresses the shortcomings of conventional elastic foundation beam methods, which fail to consider the actual structural dimensions and thus result in insufficient calculation accuracy. It takes into account the deformation of the buried power utility tunnel under the combined effects of the pressure from the upper stratum and the frictional force from the lateral stratum. The calculation process is conceptually clear, highly accurate, and reliable, facilitating precise estimation of the settlement and deformation of the buried power utility tunnel.

[0060] Example 2:

[0061] This embodiment proposes an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the method described in any embodiment of the present invention.

[0062] Example 3:

[0063] This embodiment proposes a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the method described in any embodiment of the present invention.

[0064] In this application embodiment, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent the existence of A alone, A and B simultaneously, or B alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b, and c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, and c can be single or multiple.

[0065] Those skilled in the art will recognize that the units and algorithm steps described in the embodiments disclosed herein can be implemented using electronic hardware, computer software, or a combination of electronic hardware and software. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0066] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0067] In the several embodiments provided in this application, any function, if implemented as a software functional unit and sold or used as an independent product, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0068] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for calculating the settlement of buried power utility tunnels considering lateral ground friction, characterized in that, Includes the following steps: Collect information on the geological strata, the location of the power utility tunnel, and the basic parameters of the external load on the strata. Calculate the settlement caused by the external load on the strata based on the above information. Then, calculate the settlement deformation of the power utility tunnel buried in the strata under the action of the external load pressure based on the settlement. Then, the relative settlement between the power utility tunnel and the adjacent ground is calculated by the settlement deformation of the power utility tunnel and the settlement of the ground strata on the side of the power utility tunnel. The basic frictional parameters between the power utility tunnel and the stratum are collected, and the frictional force on both sides of the power utility tunnel is calculated based on the relative settlement between the power utility tunnel and the stratum on the side. The settlement deformation of the power utility tunnel buried in the stratum under the action of external load pressure and the frictional force on both sides of the power utility tunnel are combined to calculate the settlement deformation of the power utility tunnel buried in the stratum under the action of frictional force on both sides. The above steps are iterated, and the settlement deformation of the power pipeline buried in the stratum under the action of friction on both sides in the previous iteration is used as the correction value of the settlement deformation of the power pipeline buried in the stratum under the action of external load pressure in the current iteration. Based on the correction value, the settlement deformation of the power pipeline buried in the stratum under the action of friction on both sides in the current iteration is calculated through the above steps. A preset threshold for the accuracy of power utility tunnel settlement correction is set. If the difference between the correction values ​​obtained in this iteration and the previous iteration is less than the threshold for the accuracy of power utility tunnel settlement correction, the iteration is stopped and the sum of the correction value of this iteration and the settlement deformation of the power utility tunnel buried in the stratum under the action of external load pressure is taken as the final correction value of the power utility tunnel settlement. The formula for calculating the ground friction force borne by the two sides of the power utility tunnel is as follows: in: This represents the relative settlement between the power utility tunnel and the adjacent ground strata. The relative friction height between the power utility tunnel and the adjacent ground strata; , as well as The shear parameters at the contact surface between the power utility tunnel and the adjacent strata; The specific gravity of water; The normal stress at the contact surface between the power utility tunnel and the adjacent ground strata; Atmospheric pressure; The friction angle between the power utility tunnel and the adjacent ground strata; By combining the settlement and deformation formula of a power utility tunnel buried in the stratum under external load pressure and the calculation formula of the frictional force borne by the stratum on both sides of the power utility tunnel, the settlement and deformation of a power utility tunnel buried in the stratum under the action of frictional force on both sides is constructed. Calculation formula: .

2. The method for calculating the settlement of buried power utility tunnels considering lateral ground friction according to claim 1, characterized in that, The settlement caused by external loads on the strata is calculated by constructing a settlement equilibrium formula. The specific formula is as follows: in: This refers to the vertically distributed pressure exerted on the strata. For foundation stiffness; This represents the formation shear modulus.

3. The method for calculating the settlement of buried power utility tunnels considering lateral ground friction according to claim 1, characterized in that, Based on the settlement equilibrium formula caused by external loads on the stratum, a settlement deformation formula for power utility tunnels buried in the stratum under external load pressure is constructed. This formula is then used to calculate the settlement deformation of the power utility tunnels buried in the stratum under external load pressure. The specific formula is as follows: in: Formula for structural deformation caused by external loads transferred to the power utility tunnel; The structural bending stiffness of the power utility tunnel; This refers to the cross-sectional width of the power utility tunnel.

4. The method for calculating the settlement of buried power utility tunnels considering lateral ground friction according to claim 1, characterized in that, The formula for calculating the relative settlement between the power utility tunnel and the adjacent ground strata is as follows: .

5. The method for calculating the settlement of buried power utility tunnels considering lateral ground friction according to claim 1, characterized in that, In any iteration, both the power utility tunnel and the adjacent ground strata undergo equal and opposite deformations. Therefore, the relative settlement between the power utility tunnel and the adjacent ground strata at this time is... Based on the correction value obtained in its previous iteration The calculation, specifically the formula, is as follows: .

6. The method for calculating the settlement of buried power utility tunnels considering lateral ground friction according to claim 1, characterized in that, The target power utility tunnel is divided into equal length sections using the finite difference method. A set of difference equations for the deformation coordination center between each pipe section unit is established. The required structural settlement is obtained by solving the boundary conditions at both ends of the overall power utility tunnel.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the method as described in any one of claims 1 to 6.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the method as described in any one of claims 1 to 6.

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