Method and device for determining curved rectangular jacking pipe

Abstract

The invention discloses a method and device for determining a curved rectangular jacking pipe, and the method comprises the steps: obtaining tunnel parameters which comprise the tunnel section size, the curve radius and the geological condition; according to the tunnel parameters and the material attributes of the curve rectangular jacking pipe, the jacking force needed by the curve rectangular jacking pipe in the jacking process is determined; and determining the curve rectangular jacking pipe according to the determined jacking force. According to the method, the problem that the jacking force of the curve path is difficult to calculate in the current pipe jacking tunnel design can be solved, the jacking force is accurately calculated, and the construction safety and efficiency are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of pipe jacking tunnels, in particular to a method and a device for determining a curved rectangular pipe jacking tunnel. Background Art

[0002] As a modern tunnel construction method, rectangular pipe jacking tunnel technology is increasingly favored in modern urban construction due to its unique advantages. This technology mainly uses a pipe jacking machine to advance underground to form a rectangular cross-section tunnel. Compared with traditional tunnel excavation methods, rectangular pipe jacking tunnel construction has the advantages of fast construction speed, small impact on the ground, high construction safety, environmental friendliness, strong adaptability and significant economic benefits.

[0003] Conventional rectangular pipe jacking tunnels are mostly designed in a straight line because of their simple structure and relatively straightforward calculation of the thrust during construction. The thrust refers to the force applied by the pipe jacking machine to the pipe during the advancement process, and its calculation is crucial to ensure construction safety and efficiency. In straight tunnels, traditional methods for calculating thrust are usually based on some simplified assumptions, such as uniform geological conditions and straight tunnel paths.

[0004] However, in the actual development of urban underground space, in order to avoid existing building foundations, underground pipelines and other obstacles, curved tunnel construction is also required, which requires a curved rectangular jacking pipe.

[0005] The traditional thrust calculation method is difficult to accurately reflect the impact of the curved path on the thrust, which may lead to insufficient or excessive thrust in the actual construction of curved tunnels, affecting the construction progress and safety.

[0006] Therefore, there is an urgent need for a new method that can accurately calculate the thrust of a curved rectangular jacking tunnel and thus determine the curved rectangular jacking tunnel. Summary of the invention

[0007] The present invention aims to provide a method and device for determining a curved rectangular jacking pipe, which can accurately calculate the jacking force, ensure construction safety and efficiency, and solve the problem of difficult calculation of jacking force on a curved path in current jacking pipe tunnel design.

[0008] According to one aspect of the present invention, a method for determining a curved rectangular jacking pipe is provided, comprising: acquiring tunnel parameters, the tunnel parameters including tunnel cross-sectional dimensions, curve radius, and geological conditions; determining the jacking force required for the curved rectangular jacking pipe during the jacking process based on the tunnel parameters and material properties of the curved rectangular jacking pipe; and determining the curved rectangular jacking pipe based on the determined jacking force.

[0009] Preferably, determining the jacking force required for the curved rectangular jacking pipe during the jacking process according to the tunnel parameters and the material properties of the curved rectangular jacking pipe includes: analyzing the forces applied to the curved rectangular jacking pipe during the jacking process, including soil pressure, water pressure, structure deadweight, friction, lateral soil pressure and ground overload; determining the jacking force required for the curved rectangular jacking pipe during the jacking process according to the tunnel parameters and the material properties of the curved rectangular jacking pipe and according to the analyzed forces.

[0010] Preferably, the thrust force is determined according to the following formula: F = [μ(G + P s +P w +P0)+λ(1+μ)×(P s +P w +P0)]×K R Among them, F is the thrust, P s is the soil pressure, P w is the water pressure, G is the deadweight of the structure, P0 is the ground overload, μ is the friction coefficient between the soil and the tunnel structure, λ is the lateral earth pressure coefficient, K R is the influence coefficient of curve radius.

[0011] Preferably, the thrust force is determined according to the following formula: F = [μ(G + P s +P w +P0)+λ(1+μ)×(P s +P w +P0)]×K R ×K. Among them, F is the top thrust, P s is the soil pressure, P w is the water pressure, G is the deadweight of the structure, P0 is the ground overload, μ is the friction coefficient between the soil and the tunnel structure, λ is the lateral earth pressure coefficient, K R is the influence coefficient of curve radius, K is the design safety factor, and its value range is 1.2 to 1.5.

[0012] Preferably, the curve radius influences the coefficient Among them, D e is the equivalent diameter of the tunnel, R is the curve radius, and n is an index determined according to geological conditions. For soft soil strata, the value range of n is 1 / 2 to 1; for hard soil strata, the value range of n is 1 / 3 to 1 / 2; for rock strata, the value range of n is 1 / 5 to 1 / 3.

[0013] According to another aspect of the present invention, a device for determining a curved rectangular jacking pipe is provided, comprising: an acquisition module for acquiring tunnel parameters, the tunnel parameters including tunnel section dimensions, curve radius, and geological conditions; a calculation module for determining the jacking force required for the curved rectangular jacking pipe during the jacking process based on the tunnel parameters and material properties of the curved rectangular jacking pipe; and a determination module for determining the curved rectangular jacking pipe based on the determined jacking force.

[0014] Preferably, the calculation module includes: a first calculation unit, which is used to analyze the forces on the curved rectangular jacking pipe during the jacking process, including soil pressure, water pressure, structure deadweight, friction, lateral soil pressure and ground overload; a second calculation unit, which determines the jacking force required for the curved rectangular jacking pipe during the jacking process according to the tunnel parameters and the material properties of the curved rectangular jacking pipe and according to the analyzed forces.

[0015] Preferably, the thrust force is determined according to the following formula: F = [μ(G + P s +P w +P0)+λ(1+μ)×(P s +P w +P0)]×K R Among them, F is the thrust, P s is the soil pressure, P w is the water pressure, G is the deadweight of the structure, P0 is the ground overload, μ is the friction coefficient between the soil and the tunnel structure, λ is the lateral earth pressure coefficient, K R is the influence coefficient of curve radius.

[0016] Preferably, the thrust force is determined according to the following formula: F = [μ(G + P s +P w +P0)+λ(1+μ)×(P s +P w +P0)]×K R ×K. Among them, F is the top thrust, P s is the soil pressure, P w is the water pressure, G is the deadweight of the structure, P0 is the ground overload, μ is the friction coefficient between the soil and the tunnel structure, λ is the lateral earth pressure coefficient, K R is the influence coefficient of curve radius, K is the design safety factor, and its value range is 1.2 to 1.5.

[0017] Preferably, the curve radius influences the coefficient Among them, D eis the equivalent diameter of the tunnel, R is the curve radius, and n is an index determined according to geological conditions. For soft soil strata, the value range of n is 1 / 2 to 1; for hard soil strata, the value range of n is 1 / 3 to 1 / 2; for rock strata, the value range of n is 1 / 5 to 1 / 3.

[0018] The present invention discloses a method and device for determining a curved rectangular jacking pipe, wherein the determination method comprises obtaining tunnel parameters, wherein the tunnel parameters include tunnel section size, curve radius, and geological conditions; determining the jacking force required for the curved rectangular jacking pipe during the jacking process according to the tunnel parameters and the material properties of the curved rectangular jacking pipe; and determining the curved rectangular jacking pipe according to the determined jacking force. The present invention can solve the problem of difficult calculation of jacking force for curved paths in current jacking pipe tunnel design, accurately calculate the jacking force, and ensure construction safety and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 is a schematic plan view of a large-section curved pipe-jacking tunnel according to an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of the cross-section of a rectangular top pipe according to an embodiment of the present invention; and

[0022] Figure 3 1 is a schematic diagram of the longitudinal section of a rectangular top pipe according to an embodiment of the present invention.

[0023] In the figure: 1. Starting well; 2. Receiving well; 3. Jacking tunnel. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] Reference will now be made in detail to various embodiments of the present invention, examples of which are shown in the accompanying drawings and described below. For ease of interpretation and precise definition in the appended claims, the terms "upper", "lower", "inner" and "outer" are used to describe features of the exemplary embodiments shown in the drawings with reference to their positions.

[0026] An embodiment of the present invention provides a method for determining a curved rectangular jacking pipe, comprising: obtaining tunnel parameters, the tunnel parameters including tunnel cross-sectional dimensions, curve radius, and geological conditions; determining the jacking force required for the curved rectangular jacking pipe during the jacking process according to the tunnel parameters and material properties of the curved rectangular jacking pipe; and determining the curved rectangular jacking pipe according to the determined jacking force.

[0027] In the related art, the rectangular jacking pipe is straight and difficult to adapt to the existing building foundations, underground pipelines and other obstacles in the city. In the embodiment of the present invention, by introducing a curved rectangular jacking pipe, the jacking force can be calculated more accurately in the curved case to avoid estimation deviation.

[0028] According to an embodiment of the present invention, determining the jacking force required for the curved rectangular jacking pipe during the jacking process based on the tunnel parameters and the material properties of the curved rectangular jacking pipe includes: analyzing the forces applied to the curved rectangular jacking pipe during the jacking process, including soil pressure, water pressure, structure deadweight, friction, lateral soil pressure and ground overload; determining the jacking force required for the curved rectangular jacking pipe during the jacking process based on the tunnel parameters and the material properties of the curved rectangular jacking pipe and based on the analyzed forces.

[0029] In the related art, the calculation of jacking force usually relies on simplified assumptions, such as uniform geological conditions and straight paths. This method is difficult to fully and accurately reflect the stress conditions in the actual construction environment, especially under complex geological conditions and curved paths. The stress analysis of the present invention can provide a scientific basis for the design of curved rectangular jacking tunnels, helping engineers to consider the impact of curves on construction during the design stage, thereby designing a more reasonable and economical tunnel solution.

[0030] According to an embodiment of the present invention, the thrust force is determined according to the following formula:

[0031] F=[μ(G+P s +P w +P0)+λ(1+μ)×(P s +P w +P0)]×K R , where F is the thrust, P s is the soil pressure, P w is the water pressure, G is the deadweight of the structure, P0 is the ground overload, μ is the friction coefficient between the soil and the tunnel structure, λ is the lateral earth pressure coefficient, K R is the influence coefficient of curve radius.

[0032] According to an embodiment of the present invention, the thrust force is determined according to the following formula:

[0033] F=[μ(G+P s +P w+P0)+λ(1+μ)×(P s +P w +P0)]×K R ×K, where F is the top thrust, P s is the soil pressure, P w is the water pressure, G is the deadweight of the structure, P0 is the ground overload, μ is the friction coefficient between the soil and the tunnel structure, λ is the lateral earth pressure coefficient, K R is the influence coefficient of curve radius, K is the design safety factor, and its value range is 1.2 to 1.5.

[0034] In the related art, the safety factor is difficult to provide effective safety guarantee in complex construction environments, such as in curved tunnels and complex geological conditions. The safety factor K of the present invention is preferably 1.2 to 1.5, which can ensure construction safety.

[0035] According to an embodiment of the present invention, the curve radius influences the coefficient Among them, D e is the equivalent diameter of the tunnel, R is the curve radius, and n is an index determined according to geological conditions. For soft soil strata, the value range of n is 1 / 2 to 1; for hard soil strata, the value range of n is 1 / 3 to 1 / 2; for rock strata, the value range of n is 1 / 5 to 1 / 3.

[0036] In the prior art, the calculation of jacking force often fails to fully consider the influence of different soil qualities and curve radius on jacking force. In actual construction, different soil qualities and curve radius will significantly affect the jacking force requirements, and failure to consider these factors will lead to inaccurate calculation of jacking force. The present invention determines the curve radius influence coefficient according to different soil qualities, and adjusts the jacking force in real time and dynamically, which can optimize the construction progress and reduce construction delays caused by insufficient or excessive jacking force.

[0037] According to another embodiment of the present invention, a device for determining a curved rectangular jacking pipe is provided, comprising: an acquisition module for acquiring tunnel parameters, the tunnel parameters including tunnel cross-sectional dimensions, curve radius, and geological conditions; a calculation module for determining the jacking force required for the curved rectangular jacking pipe during the jacking process based on the tunnel parameters and material properties of the curved rectangular jacking pipe; and a determination module for determining the curved rectangular jacking pipe based on the determined jacking force.

[0038] In the related art, due to the complex path of the curved tunnel, the traditional jacking force calculation method is difficult to accurately reflect the changes in the jacking force during the actual construction process, resulting in insufficient or excessive jacking force, affecting the construction efficiency and safety. The present invention obtains tunnel parameters in detail through the acquisition module, and the calculation module comprehensively analyzes these parameters and material properties to accurately calculate the jacking force required in the jacking process. The determination module selects appropriate jacking equipment and materials according to the jacking force, thereby improving the construction efficiency and quality and ensuring the safety and reliability of the construction process.

[0039] According to an embodiment of the present invention, the calculation module includes: a first calculation unit, which is used to analyze the forces on the curved rectangular jacking pipe during the jacking process, including soil pressure, water pressure, structure deadweight, friction, lateral soil pressure and ground overload; a second calculation unit, which determines the jacking force required for the curved rectangular jacking pipe during the jacking process according to the tunnel parameters and the material properties of the curved rectangular jacking pipe and the analyzed forces.

[0040] In the related art, the calculation of the jacking force often lacks accurate analysis of the curved path and complex stress conditions, resulting in inaccurate estimation of the jacking force, which leads to insufficient or excessive jacking force during the construction process, affecting the construction progress and safety. The present invention uses a first calculation unit to analyze in detail the various forces of the jacking pipe during the jacking process, and combines the second calculation unit to accurately calculate the required jacking force according to the tunnel parameters and material properties, thereby ensuring the accuracy and reliability of the jacking force. This not only improves the safety and efficiency of the jacking construction, but also avoids construction problems caused by calculation errors of traditional methods.

[0041] According to an embodiment of the present invention, the thrust force is determined according to the following formula: F = [μ(G + P s +P w +P0)+λ(1+μ)×(P s +P w +P0)]×K R Among them, F is the thrust, P s is the soil pressure, P w is the water pressure, G is the deadweight of the structure, P0 is the ground overload, μ is the friction coefficient between the soil and the tunnel structure, λ is the lateral earth pressure coefficient, K R is the influence coefficient of curve radius.

[0042] According to an embodiment of the present invention, the thrust force is determined according to the following formula: F = [μ(G + P s +P w +P0)+λ(1+μ)×(P s +P w +P0)]×K R ×K. Among them, F is the top thrust, P s is the soil pressure, Pw is the water pressure, G is the deadweight of the structure, P0 is the ground overload, μ is the friction coefficient between the soil and the tunnel structure, λ is the lateral earth pressure coefficient, K R is the influence coefficient of curve radius, K is the design safety factor, and its value range is 1.2 to 1.5.

[0043] According to an embodiment of the present invention, the curve radius influences the coefficient Among them, D e is the equivalent diameter of the tunnel, R is the curve radius, and n is an index determined according to geological conditions. For soft soil strata, the value range of n is 1 / 2 to 1; for hard soil strata, the value range of n is 1 / 3 to 1 / 2; for rock strata, the value range of n is 1 / 5 to 1 / 3.

[0044] The method of the present invention is further described in detail below in conjunction with specific implementation modes and drawings.

[0045] The method for calculating the thrust of a curved rectangular pipe jacking according to the present invention comprises the following steps:

[0046] First, data collection: collect tunnel design parameters, including tunnel section dimensions, curve radius, geological conditions, and pipe jacking material properties.

[0047] Figure 1 1 is a schematic plan view of a large-section curved pipe-jacking tunnel according to an embodiment of the present invention. Figure 1 As shown, R is the curve radius of the curve segment L1.

[0048] Second, the top pipe stress analysis: Figure 2 is a schematic diagram of the cross-section force of a rectangular top pipe according to an embodiment of the present invention, Figure 3 Schematic diagram of the longitudinal section of a rectangular top pipe according to an embodiment of the present invention. Figure 2 , Figure 3 As shown in the figure, various forces that the jacking pipe is subjected to during the construction process are analyzed, including soil pressure, water pressure, structure deadweight, friction, lateral soil pressure and ground overload.

[0049] Third, calculation of jacking force: Based on the force analysis, calculate the jacking force required by the jacking pipe during the jacking process. The calculation needs to take into account factors such as the shape and size of the tunnel section, the curve radius, and soil parameters.

[0050] The formula for calculating the top thrust is F = [μ(G+P s +P w +P0)+λ(1+μ)×(P s +P w +P0)]×K R

[0051] F d =K×F

[0052] In the formula: F is the calculated value of the top thrust; P s is the earth pressure; P w is the water pressure; G is the deadweight of the structure; P0 is the ground overload; μ is the friction coefficient between the soil and the tunnel structure; λ is the lateral earth pressure coefficient; K R F is the influence coefficient of curve radius; d is the design value of the top thrust; K is the design safety factor.

[0053] The influence of the curve radius R on the thrust force needs to take into account the uneven distribution of soil stress caused by the curve and the additional friction generated thereby. The smaller the curve radius, the more significant the unevenness, so the thrust force will increase accordingly. In order to consider the influence of the curve radius R in the calculation formula, the curve radius influence coefficient K is introduced R , which will be determined based on the curve radius and the geometric characteristics of the tunnel section. Curve influence coefficient K R The stress concentration of soil caused by the curve and the squeezing effect of the soil around the tunnel can be considered.

[0054] Curve radius influence coefficient

[0055] In the formula: D e is the equivalent diameter of the tunnel; R is the curve radius; n is an index determined according to geological conditions;

[0056] In soft soil strata, the deformation modulus of the soil is lower, and the curve effect is not as significant as that in hard soil or rock strata. The n value is relatively large, and it is advisable to take 1 / 2 to 1. Hard soil or dense sand has higher stiffness and resistance, the curve effect is more obvious, and the n value is relatively small, and it is advisable to take 1 / 3 to 1 / 2. In rocky strata, the stiffness and resistance of the rock are very large, the curve effect is very significant, and the n value is small, and it is advisable to take 1 / 5 to 1 / 3.

[0057] Fourth, safety factor verification: In order to ensure construction safety, the calculated thrust force needs to be multiplied by the safety factor K, which should be between 1.2 and 1.5.

[0058] Suppose a city needs to build a curved rectangular pipe-jacking tunnel. The design parameters of the tunnel are as follows: the equivalent diameter of the tunnel is 5 meters, the curve radius is 100 meters, the geological conditions are soft soil layers, and the material properties of the pipe-jacking tunnel are steel.

[0059] According to the present invention, the thrust force is calculated according to the following steps:

[0060] Data collection: Collect tunnel design parameters as described above.

[0061] Pipe jacking force analysis: Analyze the various forces that the pipe jacking is subjected to during the construction process, including soil pressure, water pressure, structural deadweight, friction, lateral soil pressure and ground overload. Assume that the soil pressure P s is 100kN, water pressure P w The self-weight of the structure G is 50kN, the friction coefficient μ is 0.2, the lateral earth pressure coefficient λ is 0.5, and the ground overload P0 is 20kN.

[0062] Calculation of top thrust: Calculate the top thrust F based on the force analysis. First, calculate the curve radius influence coefficient K R Since the geological condition is soft soil, the value of n is 1 / 2 to 1, and n is 1 / 2 here. Then D e =5 meters, R = 100 meters, substitute into the formula to calculate K R =1.22. Then, substitute into the thrust force calculation formula F = [μ(G+P s +P w +P0)+λ(1+μ)×(P s +P w +P0)]×K R , and calculated that F = [0.2×(50+100+50+20)+0.5×(1+0.2)(100+50+20)]×1.22=178.1 kN.

[0063] Safety factor verification: In order to ensure construction safety, the calculated jacking force needs to be multiplied by the safety factor K, where K = 1.2. The final jacking force is 178.1 × 1.2 = 213.7 kN.

[0064] In the actual construction process, it is necessary to calculate the thrust force based on the specific geological conditions and tunnel design parameters to ensure the safety and smooth progress of tunnel construction.

[0065] In summary, the present invention has the following technical effects:

[0066] (1) Improving calculation accuracy: The present invention can more accurately calculate the thrust force by introducing the geometric characteristics of the curved tunnel, thus avoiding the estimation deviation of the traditional method in the case of curves;

[0067] (2) Improve construction efficiency: By dynamically adjusting the jacking force in real time, the present invention can optimize the construction progress and reduce construction delays caused by insufficient or excessive jacking force;

[0068] (3) Cost saving: Accurate calculation of jacking force helps to rationally allocate construction resources and equipment, avoid unnecessary waste, and thus reduce overall construction costs;

[0069] (4) Optimizing engineering design: The method of the present invention can provide a scientific basis for the design of curved rectangular pipe-jacking tunnels, helping engineers to consider the impact of curves on construction during the design phase, thereby designing a more reasonable and economical tunnel solution;

[0070] (5) Wide scope of application: The method of the present invention is applicable to the construction of rectangular pipe jacking tunnels under various curve radii and geological conditions, and has good universality and adaptability.

[0071] The above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications may be made based on the following description, and these various changes, modifications, substitutions and deformations derived from the principles and spirit of the present invention still fall within the scope of protection of the present invention.

Claims

1. A method for determining a curved rectangular jacking pipe, characterized in that: include: Acquire tunnel parameters, wherein the tunnel parameters include tunnel section size, curve radius, and geological conditions; Determining the thrust force required for the curved rectangular jacking pipe during the jacking process according to the tunnel parameters and the material properties of the curved rectangular jacking pipe; as well as The curved rectangular jacking pipe is determined according to the determined jacking force.

2. The method according to claim 1, characterized in that Determining the thrust force required for the curved rectangular jacking pipe during the jacking process according to the tunnel parameters and the material properties of the curved rectangular jacking pipe includes: Analyze the forces acting on the curved rectangular jacking pipe during the jacking process, including soil pressure, water pressure, structure deadweight, friction, lateral soil pressure and ground overload; According to the tunnel parameters and the material properties of the curved rectangular jacking pipe, and according to the analyzed forces, the jacking force required for the curved rectangular jacking pipe during the jacking process is determined.

3. The method according to claim 2, characterized in that The thrust force is determined according to the following formula: F=[μ(G+P s +P w +P0)+λ(1+μ)×(P s +P w +P0)]×KR Where F is the thrust force, μ is the friction coefficient between the soil and the tunnel structure, G is the deadweight of the structure, and P s is the earth pressure, P w is the water pressure, P0 is the ground overload, λ is the lateral earth pressure coefficient, and KR is the curve radius influence coefficient.

4. The method according to claim 2, characterized in that: The thrust force is determined according to the following formula: F=[μ(G+P s +P w +P0)+λ(1+μ)×(P s +P w +P0)]×KR×K Where F is the thrust force, μ is the friction coefficient between the soil and the tunnel structure, G is the deadweight of the structure, and P s is the earth pressure, P w is the water pressure, P0 is the ground overload, λ is the lateral earth pressure coefficient, KR is the curve radius influence coefficient, and K is the design safety factor, which ranges from 1.2 to 1.

5.

5. The method according to claim 3 or 4, characterized in that: The curve radius influence coefficient Among them, D e is the equivalent diameter of the tunnel, R is the curve radius, n is an index determined according to geological conditions. For soft soil layers, the value range of n is 1 / 2 to 1; for hard soil layers, the value range of n is 1 / 3 to 1 / 2; for rock layers, the value range of n is 1 / 5 to 1 / 3.

6. A device for determining a curved rectangular jacking pipe, characterized in that: include: An acquisition module, used to acquire tunnel parameters, wherein the tunnel parameters include tunnel section size, curve radius, and geological conditions; A calculation module, which determines the jacking force required for the curved rectangular jacking pipe during the jacking process according to the tunnel parameters and the material properties of the curved rectangular jacking pipe; as well as A determination module determines the curved rectangular jacking pipe according to the determined jacking force.

7. The device according to claim 6, characterized in that A calculation module for determining the jacking force required for the curved rectangular jacking pipe during the jacking process according to the tunnel parameters and the material properties of the curved rectangular jacking pipe comprises: The first calculation unit is used to analyze the forces acting on the curved rectangular jacking pipe during the jacking process, including soil pressure, water pressure, structure deadweight, friction, lateral soil pressure and ground overload; The second calculation unit determines the jacking force required for the curved rectangular jacking pipe during the jacking process according to the tunnel parameters and the material properties of the curved rectangular jacking pipe and the analyzed force.

8. The device according to claim 7, characterized in that The thrust force is determined according to the following formula: F=[μ(G+P s +P w +P0)+λ(1+μ)×(P s +P w +P0)]×K R Where F is the thrust force, μ is the friction coefficient between the soil and the tunnel structure, G is the deadweight of the structure, and P s is the earth pressure, P w is the water pressure, P0 is the ground overload, λ is the lateral earth pressure coefficient, K R is the influence coefficient of curve radius.

9. The device according to claim 7, characterized in that The thrust force is determined according to the following formula: F=[μ(G+P s +P w +P0)+λ(1+μ)×(P s +P w +P0)]×K R ×K Where F is the thrust force, μ is the friction coefficient between the soil and the tunnel structure, G is the deadweight of the structure, and P s is the earth pressure, P w is the water pressure, P0 is the ground overload, λ is the lateral earth pressure coefficient, K R is the influence coefficient of curve radius, K is the design safety factor, and its value range is 1.2 to 1.

5.

10. The device according to claim 8 or 9, characterized in that The curve radius influence coefficient Among them, D e is the equivalent diameter of the tunnel, R is the curve radius, n is an index determined according to geological conditions. For soft soil layers, the value range of n is 1 / 2 to 1; for hard soil layers, the value range of n is 1 / 3 to 1 / 2; for rock layers, the value range of n is 1 / 5 to 1 / 3.

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