A method and system for calculating jacking force of a rectangular jacking pipe

Abstract

The application provides a jacking force calculation method and system for a rectangular jacking pipe, comprising the following steps: S1: obtaining the rectangular jacking pipe, performing axial partition on the pipe section of the rectangular jacking pipe to obtain pipe section axial partitions; performing radial partition on the pipe section of the rectangular jacking pipe to obtain pipe section radial partitions; S2: according to different pipe section axial partitions and pipe section radial partitions, calculating the pipe circumference friction of each pipe section axial partition; S3: according to the Terzaghi theory, calculating the frontal resistance of the pipe end of the rectangular jacking pipe; S4: through the frontal resistance of the pipe end of the rectangular jacking pipe and the pipe circumference friction of each pipe section axial partition, calculating the jacking force of each pipe section axial partition. The application adopts an effective stress to calculate the jacking force, and considers the axial and radial partition of the pipe section and the calculation of the jacking force by using the corresponding friction coefficient, so that the calculation result of the jacking force is more consistent with the actual situation, and it is of great significance to reasonably predict the jacking force and guide the field construction.

Description

Technical Field

[0001] This invention relates to the field of trenchless pipe jacking engineering, and in particular to a method and system for calculating the jacking force of a rectangular pipe jacking. Background Technology

[0002] Pipe jacking is a new type of tunnel excavation technology developed after shield tunneling. Pipe jacking technology has significant advantages in terms of adaptability to soil layers, protection of the surrounding environment, construction disturbance to surrounding facilities, construction safety and reliability, construction quality assurance, and economic benefits. Rectangular pipe jacking has a higher cross-sectional utilization rate than circular pipe jacking and is widely used in urban underground engineering projects such as vehicular and pedestrian tunnels, integrated utility tunnels, and subway connection passages. During pipe jacking construction, the pipe section is subjected to jacking force, face resistance, pipe wall friction, surrounding water and soil pressure, grouting pressure, its own weight, and additional surface loads. Among these, jacking force is one of the decisive parameters in pipeline structure design, pipe jacking machine selection, and working shaft structure design. Excessive jacking force will cause under-excavation, surface heave, pipe section damage, and increased hydraulic cylinder costs; insufficient jacking force will cause over-excavation, surface collapse, and the inability of the pipe section to advance. Therefore, rationally setting the jacking force parameters of the hydraulic cylinders is the most critical factor for successful pipe jacking construction.

[0003] In the long-term development of rectangular pipe jacking technology, scholars both domestically and internationally have conducted extensive research on jacking force calculation methods, proposing numerous calculation models and formulas. However, the selected influencing factors and parameters vary, leading to significant differences in the calculation results. These methods do not consider using effective stress calculations, nor do they consider dividing the axial and radial sections and setting friction coefficients for each section when calculating the jacking force, resulting in inaccurate calculation results. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a method for calculating the jacking force of a rectangular jacking pipe, comprising:

[0005] S1: Obtain the rectangular jacking pipe, divide the rectangular jacking pipe section into axial sections to obtain the axial sections of the pipe section; divide the rectangular jacking pipe section into radial sections to obtain the radial sections of the pipe section.

[0006] S2: Calculate the circumferential friction of the jacking pipe in each axial section based on the different axial and radial sections of the pipe segment;

[0007] S3: The frontal resistance at the end of the rectangular jacking pipe is calculated based on Terzaghi's theory;

[0008] S4: The jacking force of each axial section is calculated by using the frontal resistance of the rectangular jacking pipe end and the circumferential friction of each pipe section in the axial zone.

[0009] Preferred:

[0010] The axial partitions of the pipe section include: a non-mud lubrication zone, a mud lubrication transition zone, and a mud lubrication utilization zone;

[0011] The radial partitions of the pipe section include: Zone I, Zone II, and Zone III.

[0012] Preferably, step S2 specifically includes:

[0013] S21: Calculate the effective stress of the soil in the mud-free lubrication zone. pass Calculate the pipe circumferential friction resistance in the mud-free lubrication zone.

[0014] S22: Calculate the effective stress of the soil in the mud lubrication transition zone. pass Calculate the pipe circumferential friction resistance in the mud lubrication transition zone.

[0015] S23: Calculate the effective stress of the soil in the mud lubrication zone. pass Calculate the pipe circumferential friction resistance in the mud lubrication zone.

[0016] Preferably, the effective stress The calculation formula is:

[0017]

[0018] Where, σ 被 For passive earth pressure, σ 水 This refers to the groundwater pressure.

[0019] Preferably, step S22 specifically includes:

[0020] S221: Effective stress The expression is:

[0021]

[0022] Where, σ 主 For active earth pressure;

[0023] S222: Lateral earth pressure P on the pipe section l The calculation formula is:

[0024]

[0025] Among them, K a γ is the active earth pressure coefficient; H0 is the outer height of the pipe jacking machine, γ0 is the average unit weight of the soil around the pipe section, and c is the soil cohesion.

[0026] S223: Pipe circumferential friction resistance of jacking pipe The calculation formula is:

[0027]

[0028] Among them, three-sided pipe-soil contact means that the pipe and soil in Zone I and Zone II are in direct contact; two-sided pipe-soil contact means that the pipe and soil in one of Zone I and Zone II are in direct contact; B0 is the outer width of the pipe section; P s τ is the standard value of the base plate load, f is the friction coefficient between the pipe section and the surrounding soil, and L is the jacking distance; y K and n are fluid parameters, τ y denoted as slurry shear stress; K as consistency coefficient; n as rheological coefficient; V as jacking velocity; and d as slurry thickness.

[0029] Preferably, step S23 specifically includes:

[0030] S231: Effective stress immediately after grouting The calculation formula is:

[0031]

[0032] Effective stress during mud filtration stage The calculation formula is:

[0033]

[0034] Where, σ 被 For passive earth pressure, σ 主 For active earth pressure, σ 水 For groundwater pressure, σ 注 For the injection pressure, σ 泥 For mud pressure;

[0035] S232: Pipe circumferential friction resistance in the mud lubrication zone The calculation formula is:

[0036]

[0037] Where H0 is the outer height of the pipe jacking machine; B0 is the outer width of the pipe section; f is the friction coefficient between the pipe section and the surrounding soil; L is the pipe jacking distance; τ y K and n are fluid parameters, τ y denoted as slurry shear stress; K as consistency coefficient; n as rheological coefficient; V as jacking velocity; and d as slurry thickness.

[0038] Preferably, the passive earth pressure σ 被 and active earth pressure σ 主 The process of obtaining it is as follows:

[0039] Passive earth pressure σ considering soil arching effect 被 The calculation formula is:

[0040]

[0041]

[0042] Active earth pressure σ considering the soil arching effect 主 The calculation formula is:

[0043]

[0044]

[0045] Where, σ zn B is the vertical earth pressure of the nth layer; H is the width of the rectangular jacking pipe; Z is the height of the pipe section; n γ is the thickness of the nth soil layer; c is the soil cohesion; B1 is the valve width, corresponding to the influence width of the top of the buried pipeline; n Let be the unit weight of the nth soil layer. Let be the internal friction angle of the soil.

[0046] Preferably, the frontal resistance is calculated based on active earth pressure or passive earth pressure.

[0047] Preferably, the formula for calculating the jacking force is:

[0048]

[0049] Among them, F p The frontal resistance at the end of the rectangular jacking pipe. denoted as circumferential frictional resistance of the jacking pipe, and u as the axial section number of the pipe section.

[0050] A jacking force calculation system for rectangular pipe jacking, comprising:

[0051] The partitioning module is used to obtain rectangular jacking pipes, divide the rectangular jacking pipe sections into axial partitions to obtain the axial partitions of the pipe sections, and divide the rectangular jacking pipe sections into radial partitions to obtain the radial partitions of the pipe sections.

[0052] The pipe jacking friction calculation module is used to calculate the pipe jacking friction of each pipe section's axial zone based on different pipe section axial and radial zones.

[0053] The frontal resistance calculation module is used to calculate the frontal resistance at the end of the rectangular jacking pipe based on Terzaghi's theory.

[0054] The jacking force calculation module is used to calculate the jacking force of each axial section of the pipe segment by using the frontal resistance at the pipe end of the rectangular jacking pipe and the circumferential friction of each pipe segment.

[0055] The present invention has the following beneficial effects:

[0056] This invention employs an effective stress calculation method for jacking force, and considers dividing the pipe section into axial and radial sections and taking the corresponding friction coefficients to calculate the jacking force. This makes the calculated jacking force more consistent with the actual situation, which is of great significance for reasonably predicting the jacking force and thus guiding on-site construction. Attached Figure Description

[0057] Figure 1 This is a flowchart of a method according to an embodiment of the present invention;

[0058] Figure 2 This is a schematic diagram of the radial partitioning of the jacking pipe;

[0059] Figure 3 Schematic diagram of the stress around the pipe in the mud lubrication zone;

[0060] Figure 4 This is a schematic diagram of Terzaghi earth pressure theory;

[0061] Figure 5 This is a schematic diagram of the pipe jacking force.

[0062] Figure 6 A schematic diagram of the frontal resistance of the pipe jacking machine head;

[0063] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0064] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0065] Reference Figure 1 This invention provides a method for calculating the jacking force of a rectangular jacking pipe, comprising:

[0066] S1: Obtain the rectangular jacking pipe, divide the rectangular jacking pipe section into axial sections to obtain the axial sections of the pipe section; divide the rectangular jacking pipe section into radial sections to obtain the radial sections of the pipe section.

[0067] S2: Calculate the circumferential friction of the jacking pipe in each axial section based on the different axial and radial sections of the pipe segment;

[0068] S3: The frontal resistance at the end of the rectangular jacking pipe is calculated based on Terzaghi's theory;

[0069] S4: The jacking force of each axial section is calculated by using the frontal resistance of the rectangular jacking pipe end and the circumferential friction of each pipe section in the axial zone.

[0070] Further:

[0071] The axial partitions of the pipe section include: a non-mud lubrication zone, a mud lubrication transition zone, and a mud lubrication utilization zone;

[0072] The radial partitioning of the pipe section includes: Zone I, Zone II, and Zone III, as shown in the figure. Figure 2 As shown.

[0073] Furthermore, step S2 specifically involves:

[0074] S21: Calculate the effective stress of the soil in the mud-free lubrication zone. pass Calculate the pipe circumferential friction resistance in the mud-free lubrication zone.

[0075] S22: Calculate the effective stress of the soil in the mud lubrication transition zone. pass Calculate the pipe circumferential friction resistance in the mud lubrication transition zone.

[0076] S23: Calculate the effective stress of the soil in the mud lubrication zone. pass Calculate the pipe circumferential friction resistance in the mud lubrication zone.

[0077] Furthermore, in the area without mud lubrication: after the pipe jacking machine excavates, the space gap around the pipe causes ground loss, and the soil around the tunnel collapses towards the pipe wall, forming full contact between the pipe and the soil, resulting in soil pressure at the top of the pipe section;

[0078] The effective stress The calculation formula is:

[0079]

[0080] Where, σ 被 For passive earth pressure, σ 水 This refers to the groundwater pressure.

[0081] Specifically, the lateral earth pressure on the pipe section is calculated as follows:

[0082]

[0083] K a γ is the active earth pressure coefficient; H0 is the pipe section height; γ0 is the average unit weight of the soil surrounding the pipe section; and c is the soil cohesion.

[0084] The foundation reaction force of a typical rectangular pipe section is calculated based on force equilibrium, which is the sum of the top earth pressure and the self-weight of the pipe section.

[0085] P s =σ 土 +G

[0086] In the formula: P s Here is the standard value of the base plate load, in kPa; σ 土 G represents the effective stress of the soil at the top of the rectangular pipe section; G is the self-weight of the pipe section.

[0087] Pipe circumferential friction resistance:

[0088]

[0089] In the formula σ 土 The effective stress of the soil at the top of the rectangular pipe section is given by P, where H0 is the outer height of the pipe jacking machine, B0 is the outer width of the pipe section, and P is the effective stress of the soil at the top of the rectangular pipe section. l P is the lateral earth pressure on the pipe section. s denoted as the standard value of the base plate load, f as the friction coefficient between the pipe section and the surrounding soil, and L as the jacking distance of the pipe.

[0090] Furthermore, in the mud lubrication transition zone: the contact between pipe and soil gradually transitions to three-sided pipe-soil contact and two-sided pipe-soil contact, while the remaining surfaces are in pipe-mud contact. This can be considered as Zone I, Zone II in contact with soil, and Zone III in contact with mud. At this time, a complete mud sleeve has not yet been formed.

[0091] Step S22 is as follows:

[0092] S221: Effective stress The expression is:

[0093]

[0094] Where, σ 主 For active earth pressure;

[0095] S222: Lateral earth pressure P on the pipe section l The calculation formula is:

[0096]

[0097] Among them, K a γ is the active earth pressure coefficient; H0 is the outer height of the pipe jacking machine (in meters), γ0 is the average unit weight of the soil surrounding the pipe section, and c is the soil cohesion; where P l Take the lateral earth pressure of the pipe section with three and two sides in contact respectively in the above formula;

[0098] S223: Pipe circumferential friction resistance of jacking pipe The calculation formula is:

[0099]

[0100] Among them, "three-sided pipe-soil" means that the pipe and soil in Zone I and Zone II are in direct contact, "two-sided pipe-soil" means that the pipe and soil in one of Zone I and Zone II are in direct contact, B0 is the outer width of the pipe section (in meters), P s τ is the standard value of the base plate load, f is the friction coefficient between the pipe section and the surrounding soil, and L is the jacking distance; y K and n are fluid parameters, τ y K is the shear stress of the mud (in Pa); K is the consistency coefficient (in Pa·s). n ); n is the rheological coefficient (unit: s). -1 V is the jacking speed, and d is the mud thickness.

[0101] Furthermore, in the mud lubrication zone: when mud lubrication is fully utilized, the pipe-soil contact state changes from full pipe-soil contact to top-surface pipe-soil contact, while the pipe section's sides and bottom are in contact with the mud, as shown in the schematic diagram. Figure 3 As shown, the effective stress of the soil is taken from the earth pressure at the top of the pipe section.

[0102] Step S23 is as follows:

[0103] S231: Effective stress immediately after grouting The calculation formula is:

[0104]

[0105] Effective stress during mud filtration stage The calculation formula is:

[0106]

[0107] Where, σ 被 For passive earth pressure, σ 主 For active earth pressure, σ 水 For groundwater pressure, σ 注 For the injection pressure, σ 泥 For mud pressure;

[0108] S232: Pipe circumferential friction resistance in the mud lubrication zone The calculation formula is:

[0109]

[0110] Where H0 is the outer height of the pipe jacking machine; B0 is the outer width of the pipe section; f is the friction coefficient between the pipe section and the surrounding soil; L is the pipe jacking distance; τ y K and n are fluid parameters, τ ydenoted as slurry shear stress; K as consistency coefficient; n as rheological coefficient; V as jacking velocity; and d as slurry thickness.

[0111] Furthermore, such as Figure 4 As shown, the passive earth pressure and active earth pressure considering the soil arching effect are calculated based on Terzaghi's theory.

[0112] Figure 4 σ h τ is the normal stress (kPa) at the shear band; f q represents the shear stress at the shear zone (kPa); q represents the soil column load above the shear zone (kPa); Z represents the burial depth of the top of the jacking pipe (m); Z1 represents the height of the soil column above the shear zone (m); a, b, and c are auxiliary lines, representing the bottom, top, and shear zone development height of the rectangular jacking pipe, respectively; other symbols are explained as in the main text.

[0113] Passive earth pressure σ considering soil arching effect 被 and active earth pressure σ 主 The process of obtaining it is as follows:

[0114] Passive earth pressure σ considering soil arching effect 被 The calculation formula is:

[0115]

[0116]

[0117] Active earth pressure σ considering the soil arching effect 主 The calculation formula is:

[0118]

[0119]

[0120] Where, σ zn B is the vertical earth pressure of the nth layer; H is the width of the rectangular jacking pipe; Z is the height of the pipe section; n γ is the thickness of the nth soil layer; c is the soil cohesion; B1 is the valve width, corresponding to the influence width of the top of the buried pipeline; n Let φ be the unit weight of the nth soil layer, and φ be the internal friction angle of the soil.

[0121] Considering that the force is transferred between soil layers through the compression of soil particles, the vertical earth pressure is calculated from top to bottom of the soil layer, that is, the earth pressure at the bottom of the upper soil layer is regarded as the external load at the top of the lower soil layer; at the same time, considering the influence of groundwater, the natural unit weight is taken for soil above the groundwater level, and the effective unit weight is taken for soil below the groundwater level.

[0122] Furthermore, the frontal resistance is calculated based on active earth pressure or passive earth pressure.

[0123] Specifically, the frontal resistance is calculated using Rankine's earth pressure theory, as shown in the diagram below. Figure 5 As shown, the frontal resistance F at the end of the rectangular jacking pipe p for:

[0124] Calculated based on active earth pressure:

[0125] Calculated based on passive earth pressure:

[0126] In the formula: F p γ is the frontal resistance at the pipe end of the jacking pipe, in kN; i The unit weight of the i-th soil layer is kN / m³. 3 When located below the groundwater level, the "separate calculation of water and soil" is used, taking the buoyant unit weight of the soil; the "combined calculation of water and soil" is used, taking the saturated unit weight of the soil; γ w The specific weight of water, in kN / m³. 3 γ0 is the average unit weight of the soil surrounding the pipe section, in kN / m³. 3 H i H represents the thickness of the i-th soil layer, in meters (m). w H0 is the height from the water level to the center of the pipe, in meters; B0 is the height of the outer edge of the pipe jacking machine, in meters; C0 is the outer width of the pipe section, in meters; and C is the cohesion of the soil, in kN / m. 2 ;K a The active earth pressure coefficient, K p Passive earth pressure coefficient

[0127] Furthermore, the jacking force diagram is as follows: Figure 6 As shown;

[0128] The formula for calculating the jacking force is:

[0129]

[0130] Among them, F p The frontal resistance (in kN) at the end of the rectangular jacking pipe. denoted as circumferential frictional resistance of the jacking pipe (unit: kN), and u is the axial section number of the pipe section.

[0131] The parameter values ​​in the above calculation formula are as follows:

[0132] ① The length l1 of the non-mud lubrication zone is determined according to the actual situation. The length l2 of the mud lubrication transition zone is taken as 1 / 4 of the total length of the pipe section. The remaining 3 / 4 of the total length of the pipe section is the length l3 of the mud lubrication utilization zone.

[0133] ②Injection pressure σ注 and groundwater pressure σ 水 All of these can be obtained through monitoring. The specific monitoring method used is the injection pressure σ. 注 Monitoring is conducted using a vibrating wire pressure sensor, which collects temperature and vibration frequency data and converts them into pressure values ​​through a calibration equation; the groundwater pressure σ 水 Water pressure was monitored using data from geological surveys and hydrogeological measurement methods, employing a pore pressure static cone penetrometer. Specifically, a porous permeable filter and pressure sensor were mounted on the probe, and pore water pressure was measured during penetration. In the mud loss section, a good mud cake formed on the sidewalls and bottom of the borehole. While the borehole perimeter was stable and mud remained even under stable pressure, the mud pressure on the sidewalls reached a dynamic equilibrium with the groundwater pressure, reducing the pressure difference to zero. At this point, mud loss into the soil ceased, and the mud pressure σ... 泥 Magnitude equal to groundwater pressure σ 水 .

[0134] ③ The friction coefficient f between the pipe section and the surrounding soil is taken from the following table:

[0135] Table 1. Values ​​of friction coefficient f

[0136]

[0137] This invention provides a jacking force calculation system for rectangular pipe jacking, comprising:

[0138] The partitioning module is used to obtain rectangular jacking pipes, divide the rectangular jacking pipe sections into axial partitions to obtain the axial partitions of the pipe sections, and divide the rectangular jacking pipe sections into radial partitions to obtain the radial partitions of the pipe sections.

[0139] The pipe jacking friction calculation module is used to calculate the pipe jacking friction of each pipe section's axial zone based on different pipe section axial and radial zones.

[0140] The frontal resistance calculation module is used to calculate the frontal resistance at the end of the rectangular jacking pipe based on Terzaghi's theory.

[0141] The jacking force calculation module is used to calculate the jacking force of each axial section of the pipe segment by using the frontal resistance at the pipe end of the rectangular jacking pipe and the circumferential friction of each pipe segment.

[0142] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0143] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. In the unit claims listing several devices, several of these devices may be embodied by the same hardware item. The use of the terms first, second, and third, etc., does not indicate any order and can be interpreted as identifiers.

[0144] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method for calculating the jacking force of a rectangular pipe jacking system, characterized in that, include: S1: Obtain the rectangular jacking pipe, divide the rectangular jacking pipe section into axial sections to obtain the axial sections of the pipe section; divide the rectangular jacking pipe section into radial sections to obtain the radial sections of the pipe section. S2: Calculate the circumferential friction of the jacking pipe in each axial section based on the different axial and radial sections of the pipe segment; S3: The frontal resistance at the end of the rectangular jacking pipe is calculated based on Terzaghi's theory; S4: Calculate the jacking force of each axial section of the pipe segment by using the frontal resistance of the rectangular jacking pipe end and the circumferential friction of each pipe segment in the axial section. The axial partitions of the pipe section include: a non-mud lubrication zone, a mud lubrication transition zone, and a mud lubrication utilization zone; The radial partitions of the pipe section include: Zone I, Zone II, and Zone III; Step S2 is as follows: S21: Calculate the effective stress of the soil in the mud-free lubrication zone. ,pass Calculate the pipe circumferential friction resistance in the mud-free lubrication zone. ; S22: Calculate the effective stress of the soil in the mud lubrication transition zone. ,pass Calculate the pipe circumferential friction resistance in the mud lubrication transition zone. ; S23: Calculate the effective stress of the soil in the mud lubrication zone. ,pass Calculate the pipe circumferential friction resistance in the mud lubrication zone. .

2. The method for calculating the jacking force of a rectangular jacking pipe according to claim 1, characterized in that, The effective stress The calculation formula is: in, For passive earth pressure, This refers to the groundwater pressure.

3. The method for calculating the jacking force of a rectangular jacking pipe according to claim 1, characterized in that, Step S22 is as follows: S221: Effective stress The expression is: in, For active earth pressure; S222: Lateral earth pressure on the pipe section The calculation formula is: in, This is the active earth pressure coefficient; H 0 represents the height of the outer edge of the pipe jacking machine. denoted as ρ, where ρ is the average unit weight of the soil surrounding the pipe section, and c is the cohesion of the soil. S223: Pipe circumferential friction resistance of jacking pipe The calculation formula is: Among them, "three-sided soil pipe" means that the soil pipes in both Zone I and Zone II are in direct contact, while "two-sided soil pipe" means that the soil pipes in one of Zones I and II are in direct contact. For the outer width of the pipe section, This represents the standard value of the base plate load. The friction coefficient between the pipe section and the surrounding soil is L, and the jacking distance is L. denoted as slurry shear stress; K as consistency coefficient; n as rheological coefficient; V as jacking velocity; and d as slurry thickness.

4. The method for calculating the jacking force of a rectangular jacking pipe according to claim 1, characterized in that, Step S23 is as follows: S231: Effective stress immediately after grouting The calculation formula is: Effective stress during mud filtration stage The calculation formula is: in, For passive earth pressure, For active earth pressure, For groundwater pressure, To inject pressure, For mud pressure; S232: Pipe circumferential friction resistance in the mud lubrication zone The calculation formula is: in, The outer edge of the pipe jacking machine is higher; The outer width of the pipe section; This is the coefficient of friction between the pipe section and the surrounding soil. This refers to the pipe jacking distance; This refers to the shear stress in the mud. K This is the consistency coefficient; n Rheological coefficient, V For the jacking speed, d This refers to the thickness of the mud slurry.

5. The method for calculating the jacking force of a rectangular jacking pipe according to claim 4, characterized in that, passive earth pressure and active earth pressure The process of obtaining it is as follows: Passive earth pressure considering soil arching effect The calculation formula is: Active earth pressure considering soil arching effect The calculation formula is: in, For the first n Vertical earth pressure on the layer; B The width of the rectangular jacking pipe; H This refers to the height of the pipe section; Let be the thickness of the nth soil layer; c The cohesive force of the soil; B 1 represents the width of the valve, corresponding to the width of the buried pipeline's top. Let be the unit weight of the nth soil layer. Let be the internal friction angle of the soil.

6. The method for calculating the jacking force of a rectangular jacking pipe according to claim 1, characterized in that, The frontal resistance is calculated based on active earth pressure or passive earth pressure.

7. The method for calculating the jacking force of a rectangular jacking pipe according to claim 1, characterized in that, The formula for calculating the jacking force is: in, The frontal resistance at the end of the rectangular jacking pipe. denoted as circumferential frictional resistance of the jacking pipe, and u as the axial section number of the pipe section.

8. A jacking force calculation system for rectangular pipe jacking, characterized in that, The method for implementing claim 1 includes: The partitioning module is used to obtain rectangular jacking pipes, divide the rectangular jacking pipe sections into axial partitions to obtain the axial partitions of the pipe sections, and divide the rectangular jacking pipe sections into radial partitions to obtain the radial partitions of the pipe sections. The pipe jacking friction calculation module is used to calculate the pipe jacking friction of each pipe section's axial zone based on different pipe section axial and radial zones. The frontal resistance calculation module is used to calculate the frontal resistance at the end of the rectangular jacking pipe based on Terzaghi's theory. The jacking force calculation module is used to calculate the jacking force of each axial section of the pipe segment by using the frontal resistance at the pipe end of the rectangular jacking pipe and the circumferential friction of each pipe segment.

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