Calculation method for TBM jacking force of different subareas of soft and hard tunneling sections

Abstract

The invention discloses a method for calculating TBM jacking force of different subareas of soft and hard tunneling sections. The method comprises the following steps: 1, calculating propelling frictional resistance of a cutterhead panel and a rock mass; 2, calculating the frictional resistance between the shell of the body and the surrounding rock mass; 3, calculating the propelling resistance of the cutter under the composite stratum condition; 4, calculating the pressure of a soil bin at an opening of a cutter head, the resistance of a traction trailer and the frictional resistance between a duct piece and a shield tail; and 5, calculating the TBM jacking force of different subareas of the soft and hard tunneling sections. According to the method, the tunneling section proportion is dynamically divided based on the soft and hard boundary angles, multi-source mechanical parameters are integrated, jacking force distribution of different partitions is calculated, the problem that traditional tunneling parameters of the TBM are insufficient in adaptability in the composite stratum is effectively solved, and reliable technical guarantee is provided for high-quality construction of tunnel engineering.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of TBM jacking force calculation, and particularly relates to a TBM jacking force calculation method for different partitions of a soft-hard excavation section. BACKGROUND

[0002] At present, there are technical problems in TBM excavation in composite strata, and information perception of surrounding rock conditions and control optimization of excavation parameters need to be further studied. In the process of excavation in composite strata, soft and hard rock bodies are distributed in the excavation section. Due to the different strengths of the rock bodies, the cutter head panel is subjected to the pressure of the soft and hard rock bodies. If the excavation parameters cannot be accurately controlled, major problems such as unstable excavation posture and machine jamming are easily caused, and the construction efficiency is reduced. The calculation of the jacking force of TBM excavation needs to consider multiple mechanical actions and control them in partitions, which can reduce the risk of deviating from the tunnel axis in the process of excavation. Therefore, there is a lack of a method for partition calculation of the jacking force of soft and hard excavation sections in composite strata. SUMMARY

[0003] The technical problem to be solved by the application is to provide a TBM jacking force calculation method for different partitions of a soft-hard excavation section to solve the problems in the prior art.

[0004] To solve the above technical problems, the technical solution adopted by the application is as follows: a TBM jacking force calculation method for different partitions of a soft-hard excavation section, characterized in that the method comprises the following steps: Step one, calculate the jacking resistance of the cutter head panel and the rock body: calculate the jacking resistance of the cutter head panel of the soft and hard excavation sections respectively, and consider the division of the soft and hard rock proportion of the excavation section according to the angle of the soft and hard boundary line, to obtain the jacking resistance of the cutter head panel under the condition of composite strata; Step two, calculate the friction resistance between the machine body shell and the surrounding rock body: calculate the vertical soil pressure and the lateral soil pressure of the soft and hard rock bodies acting on the machine body shell respectively, select the friction coefficient between the machine body shell and different types of rock bodies, and calculate the friction resistance of the TBM machine body shell under the condition of complex strata; Step three, calculate the normal force distribution of a single cutter acting on different strength rock, and superimpose the cutter jacking resistance under the condition of composite strata according to the number of cutters acting on the soft and hard partitions; Step four, calculate the soil chamber pressure at the cutter head opening, the traction trailer resistance, and the friction resistance between the segment and the shield tail; Step five, calculate the TBM jacking force of different partitions of a soft-hard excavation section according to the jacking resistance of the cutter head panel and the rock body, the friction resistance between the machine body shell and the strata, the jacking normal force of the cutter acting on the soft and hard rock bodies, the soil chamber pressure at the cutter head opening, the traction trailer resistance, and the friction resistance between the segment and the shield tail.

[0005] The soft-hard excavation section different partition TBM jacking force calculation method has the characteristics that in step one, the process of calculating the jacking resistance of the cutter head panel and the rock mass includes the following steps: Step 101, according to the formula , the vertical micro-element soil pressure of the cutter head panel composite rock layer is calculated , according to the formula , the lateral micro-element soil pressure of the cutter head panel composite rock layer is calculated , wherein is the distance from the top of the cutter head to the ground, unit ; is the soil bulk density, unit ; is the cutter head radius, unit ; is the distance from the calculation point to the center of the cutter head, unit ; is the included angle between the calculation point and the horizontal line of the cutter head, unit °; is the static earth pressure coefficient, ; is the internal friction angle of the soil; Step 102, the lateral soil pressure of the composite rock layer acting on the cutter head panel is calculated, the rock layer boundary is divided into and in polar coordinate form, according to the distance between the rock layer boundary and the ground, it is expressed as follows: When , that is, the soft-hard rock layer boundary is above the horizontal line of the cutter head, , , , , wherein, and are the jacking resistances of the upper and lower soft-hard rock masses, and are angle parameters related to the rock layer interface, unit °; is the distance from the soil layer boundary to the ground, unit ; and are the specific gravities of the upper and lower soft-hard rock masses, unit ; and are the internal friction angles of the upper and lower soft-hard rock masses, unit °; When , the soft-hard rock layer boundary coincides with the horizontal line of the cutter head, , ; When When the soft and hard rock layer boundary line is below the cutter head horizontal line, , , , ; Step 103, considering the influence of the cutter head opening, calculate the cutter head front pushing friction force : , wherein, is the cutter head opening rate.

[0006] The above-mentioned soft and hard tunneling section different partition TBM jacking force calculation method is characterized in that: in step two, the process of calculating the friction resistance of the machine shell and the surrounding rock mass includes the following steps: Step 201, according to the formula , calculate the vertical earth pressure on the machine shell part , according to the formula , calculate the lateral earth pressure on the machine shell part , according to the vertical earth pressure and the lateral earth pressure on the TBM shell, calculate the earth pressure on the contact surface between the machine shell and the rock mass per unit length in the radial direction ; Step 202, because there is a component of the TBM weight in the process of the lower half of the TBM shell being subjected to friction resistance, therefore, according to the formula , calculate the micro-unit , of the TBM machine body on the surface of the machine shell ; is the length of the machine body, unit ; Step 203, calculate the radial earth pressure of the composite rock layer acting on the TBM machine shell, divide the rock layer boundary line into and in polar coordinate form, express the distance between the rock layer boundary line and the ground surface, and calculate the friction resistance according to the position of the rock layer boundary line and the cutter head horizontal line: When , that is, the soft and hard rock layer boundary line is above the cutter head horizontal line, , , and are the friction resistances of the upper and lower soft and hard rock masses on the machine shell; When , the soft and hard rock layer boundary line coincides with the cutter head horizontal line, , ; When , the soft and hard rock layer boundary line is below the cutter head horizontal line, , ; respectively the friction coefficient between the TBM shell and the surrounding soft and hard rock mass; Step 204, calculating the friction resistance between the machine shell and the stratum according to the friction resistance calculation formula between the TBM shell and the surrounding rock mass under different soft and hard partition is: .

[0007] The soft and hard tunneling section different partition TBM jacking force calculation method has the characteristics that in step three, the process of calculating the normal force distribution of a single cutter acting on different strength rocks and superimposing the calculation of the cutter advancing resistance under the condition of composite stratum according to the number of cutters acting on the soft and hard partition includes the following steps: Step 301, calculating the normal force of a single cutter according to the formula , wherein, is a dimensionless coefficient, generally 2.12; is the cutter blade width; is the radius of a single cutter; is the contact arc of the cutter and the rock surface and ; is the blade pressure coefficient; is the adjacent cutter blade spacing; respectively the compressive strength and tensile strength of the rock, is the cutter penetration degree; Step 302, calculating the resultant force of the cutter in the normal direction according to the number of soft and hard rock layer partitions of the cutter and : Step 303, adding the normal force of the cutter acting on the different partition rock mass to obtain the cutter advancing resistance .

[0008] The soft and hard tunneling section different partition TBM jacking force calculation method has the characteristics that in step four, according to the formula , calculating the soil chamber pressure at the cutter head opening , according to the formula , calculating the traction trailer resistance , according to the formula , calculating the friction resistance between the segment and the shield tail wherein, is the average soil chamber pressure; is the friction coefficient between the wheel and the track; is the self weight of the rear matching trailer, unit ; is the number of segment rings in the TBM shell; is the self-weight of the lining segment ring, and the unit is ; is the outer diameter of the segment ring, and the unit is ; is the contact length of the tail brush and the segment ring, and the unit is ; is the pressure of the tail sealing brush, and the unit is ; is the number of layers of the sealing layer in contact with the tail and the segment; is the friction coefficient between the tail brush and the segment ring.

[0009] The TBM thrust force calculation method for different partitions of a soft and hard excavation section, wherein, in step five, the total thrust force is calculated according to the formula , and the thrust force cylinder acting area of different partitions of soft and hard rock is calculated, and then the soft rock part and the hard rock part are divided. . The beneficial effects of the present application are: the influence of the non-uniform characteristics of the lithology distribution in the composite stratum on the TBM acting area is considered, the cutter head panel partitioned frontal resistance calculation, the machine body shell layered friction resistance calculation, and the partitioned superposition calculation of the law of the cutter normal force are increased, the precision and engineering applicability of the thrust force calculation are improved, the fine calculation model of the TBM thrust force under the condition of the composite stratum is established, more reliable theoretical basis is provided for optimizing the excavation parameters and reducing the equipment excavation risk under complex conditions, and the control precision and construction efficiency of the excavation process can be further improved. Based on the dynamic division of the excavation section proportion according to the soft and hard division line angle, the multi-source mechanical parameters are integrated, the thrust force distribution of different partitions is calculated, the problem of insufficient adaptability of the traditional excavation parameters of the TBM in the composite stratum is effectively solved, and reliable technical support is provided for the high-quality construction of the tunnel engineering.

[0010] The technical solutions of the present application will be further described in detail below with the help of the drawings and examples. DRAWINGS

[0011] Fig. 1 is a cutter head frontal resistance calculation model diagram of the TBM thrust force calculation method for different partitions of a soft and hard excavation section considered by the present application.

[0012] Fig. 2 is a machine shell and surrounding soil friction force calculation model diagram of the TBM thrust force calculation method for different partitions of a soft and hard excavation section considered by the present application.

[0013] Fig. 3 is a cutter acting on rock force diagram of the TBM thrust force calculation method for different partitions of a soft and hard excavation section considered by the present application.

[0014] Fig. 4 This is a flowchart of the method of the present invention. Detailed Implementation

[0015] like Figs. 1 to 4 As shown, the present invention provides a method for calculating the thrust of a TBM in different sections of a soft and hard tunneling cross-section, comprising the following steps: Step 1: Calculate the propulsion friction between the cutterhead panel and the rock mass: Calculate the propulsion friction of the cutterhead panel for both soft and hard tunneling sections, and consider the division of the soft and hard rock ratio of the tunneling section by the angle of the soft-hard boundary line to obtain the propulsion friction of the cutterhead panel under the composite stratum conditions. Step 2: Frictional resistance between the TBM shell and the surrounding rock mass: Calculate the vertical and lateral earth pressures exerted by soft and hard rock masses on the shell, select the friction coefficients between the shell and different types of rock masses, and calculate the frictional resistance of the TBM shell during tunneling under complex geological conditions. Step 3: Calculate the normal force distribution of a single cutter acting on rocks of different strengths, and calculate the cutter advance resistance under composite strata conditions by superimposing the number of cutters acting on soft and hard zones. Step 4: Calculate the soil pressure at the cutterhead opening, the traction trailer resistance, and the frictional resistance between the segments and the shield tail. Step 5: Calculate the TBM jacking force for different zones of the soft and hard tunneling section based on the advancing frictional resistance between the cutterhead panel and the rock mass, the frictional resistance between the machine body shell and the stratum, the advancing normal force of the cutterhead on both soft and hard rock masses, the soil pressure at the cutterhead opening, the traction trailer resistance, and the frictional resistance between the tunnel segments and the shield tail.

[0016] In this embodiment, step one, the process of calculating the propulsion friction between the cutterhead panel and the rock mass, includes the following steps: Step 101, according to the formula Calculate the vertical micro-element earth pressure on the composite rock layer of the cutterhead face. According to the formula Calculate the lateral micro-element earth pressure on the composite rock layer of the cutterhead face. ,in, The distance from the top of the cutterhead to the ground surface, in units. ; For the unit weight of soil, in units ; The radius of the cutter head, in units ; To calculate the distance from the point of origin to the center of the cutter head, in units of... ; The angle between the calculation point and the horizontal line of the cutter head, in degrees; The coefficient of earth pressure at rest. ; the internal friction angle of the soil; Step 102, calculating the lateral earth pressure of the composite rock stratum acting on the cutter head panel, dividing the rock stratum boundary line into and According to the distance between the rock stratum boundary line and the ground surface, it is expressed as follows: When , that is, the soft and hard rock stratum boundary line is above the cutter head horizontal line, , , , , wherein, and are the advancing frictional forces of the upper and lower soft and hard rock bodies, and are the angle parameters related to the rock stratum interface, unit °; is the distance from the soil stratum boundary surface to the ground surface, unit ; and are the specific gravities of the upper and lower soft and hard rock bodies, unit ; and are the internal friction angles of the upper and lower soft and hard rock bodies, unit °; When , the soft and hard rock stratum boundary line coincides with the cutter head horizontal line, , ; When , the soft and hard rock stratum boundary line is below the cutter head horizontal line, , , , ; Step 103, considering the influence of the cutter head opening, calculating the advancing frictional force on the front face of the cutter head is: wherein, is the opening rate of the cutter head.

[0017] It should be noted that the present embodiment clearly defines the soft and hard rock stratum interface and calculates the earth pressure partition under different strength rock strata. Since the parameters such as the soil bulk density and the internal friction angle of different rock strata are not the same, the vertical earth pressure and the lateral earth pressure of a specific rock stratum are calculated by inputting its own parameters. The advancing frictional force on the front face of the cutter head is divided into soft and hard rock stratum action areas for calculation. Three different working conditions are set, which are that the soft and hard stratum boundary line is above, coincides with, and is below the cutter head horizontal line.

[0018] In this embodiment, the process of calculating the frictional resistance between the computer shell and the surrounding rock mass in step two includes the following steps: Step 201, according to the formula , the vertical earth pressure on the computer shell part , according to the formula , the lateral earth pressure on the computer shell part , according to the vertical earth pressure on the TBM shell and the lateral earth pressure , the earth pressure on the contact surface between the computer shell and the rock mass per unit length in the radial direction ; Step 202, due to the existence of the self-weight component of the TBM during the process of frictional resistance on the lower half of the TBM shell, according to the formula , the micro-unit , of the TBM body on the surface of the shell is calculated ; is the length of the body, unit ; Step 203, calculate the radial earth pressure of the composite rock layer acting on the TBM body shell, divide the rock layer boundary line into and according to the polar coordinate form, express it according to the distance between the rock layer boundary line and the ground surface, and calculate the frictional resistance according to the position of the stratum boundary line and the horizontal line of the cutter head: When , that is, the soft and hard rock layer boundary line is above the horizontal line of the cutter head, , , and are the frictional resistance of the upper and lower soft and hard rock mass on the body shell; When , the soft and hard rock layer boundary line coincides with the horizontal line of the cutter head, , ; When , the soft and hard rock layer boundary line is below the horizontal line of the cutter head, , ; are the friction coefficients between the TBM shell and the surrounding soft and hard rock mass, respectively; Step 204, according to the frictional resistance calculation formula between the TBM shell and the surrounding rock mass in different soft and hard zones, calculate the frictional resistance between the computer body shell and the stratum is: .

[0019] It should be noted that the frictional resistance between the TBM machine shell and the surrounding rock mass is calculated by multiplying the radial earth pressure of different rock layers acting on the shell and the friction coefficient between the surrounding rock mass and the shell. The radial earth pressure is determined by the vector synthesis of the vertical earth pressure and the lateral earth pressure in the radial direction, and its distribution is non-uniform due to the influence of rock layer boundaries. Due to the differences in strength and proportion of the rock layers crossed by the tunneling section, the section needs to be divided into different regions according to the lithological boundary, and the radial earth pressure of each rock layer on the shell is calculated respectively, and then the total frictional resistance is obtained by integration combined with the friction coefficient of the corresponding rock mass and the shell.

[0020] In this embodiment, in step three, the normal force distribution of a single cutter acting on different strength rocks is calculated, and the process of superimposing the cutter advancing resistance under the condition of composite stratum for the number of cutters acting on soft and hard partitions includes the following steps: Step 301, according to the formula , calculate the normal force of a single cutter , wherein, is a dimensionless coefficient, generally taken as 2.12; is the cutter blade width; is the radius of a single cutter; is the contact arc of the cutter and the rock surface, and ; is the blade pressure coefficient; is the adjacent cutter blade spacing; are the compressive strength and tensile strength of the rock, is the cutter penetration degree; Step 302, calculate the resultant force of the cutter in the normal direction according to the number of cutters in soft and hard rock layers and : Step 303, add the normal force of the cutter acting on different partition rock masses to obtain the cutter advancing resistance .

[0021] In this embodiment, in step four, according to the formula , calculate the soil chamber pressure at the cutter head opening , according to the formula , calculate the traction trailer resistance , according to the formula , calculate the frictional resistance between the segment and the shield tail , wherein, is the average soil chamber pressure; is the friction coefficient of the wheel and the track; is the self-weight of the rear supporting trailer, unit is ; is the number of segment rings in the TBM shell; is the self-weight of the lining segment ring, unit is ; is the outer diameter of the segment ring, unit is ; is the contact length of the shield tail brush and the segment ring, unit is ; is the pressure of the shield tail sealing brush, unit is ; is the number of layers of the sealing layer of the shield tail and the segment contact; is the friction coefficient between the shield tail brush and the segment ring.

[0022] In this embodiment, in step five, the total jacking force F is calculated according to the formula . The jacking force oil cylinder action area of different partition soft and hard rock is calculated, which can be divided into soft rock part and hard rock part .

[0023] When the present application is used, the influence of the non-uniform characteristics of the lithology distribution in the composite stratum on the TBM action area is considered, the cutter head panel partition frontal resistance calculation, the machine body shell layered friction resistance calculation and the segment ring partition superposition calculation of the roller cutter normal force are increased, the precision and engineering applicability of the jacking force calculation are improved, the fine calculation model of the TBM jacking force under the composite stratum condition is established, more reliable theoretical basis for optimizing the tunneling parameters and reducing the equipment tunneling risk under complex conditions is provided, and the control precision and construction efficiency of the tunneling process can be further improved. Based on the dynamic division of the tunneling section proportion according to the soft and hard boundary line angle, the multi-source mechanical parameters are integrated, the jacking force distribution of different partitions is calculated, the problem of insufficient adaptability of the traditional tunneling parameters of the TBM in the composite stratum is effectively solved, and reliable technical support for high-quality construction of tunnel engineering is provided. The above is only a preferred embodiment of the present application, and does not limit the present application in any way. Any simple modification, change and equivalent structural change made according to the technical essence of the present application to the above embodiment are still within the protection scope of the technical solution of the present application.

Claims

1. A method for calculating the thrust of a TBM with different partitions in soft and hard excavation sections, characterized in that, The method comprises the following steps: Step one, calculating the advancing frictional resistance of the cutter head panel and the rock mass: the advancing frictional resistance of the soft and hard excavation section cutter head panel is calculated respectively, and the division of the soft and hard rock proportion of the excavation section by the angle of the soft and hard division line is considered, so as to obtain the advancing frictional resistance of the cutter head panel under the condition of composite stratum; Step two, calculating the frictional resistance of the machine body shell and the surrounding rock mass: the vertical earth pressure and the lateral earth pressure of the soft and hard rock mass acting on the machine body shell are calculated respectively, the friction coefficient between the machine body shell and different types of rock mass is selected, and the frictional resistance of the TBM machine body shell under the condition of excavation in complex stratum is calculated; Step three, calculating the normal force distribution of a single cutter acting on different strength rock, and superimposing the number of cutters acting on the soft and hard partition to calculate the cutter advancing resistance under the condition of composite stratum; Step four, calculating the soil chamber pressure at the cutter head opening, the traction trailer resistance, and the frictional resistance of the segment and the shield tail; Step five, calculating the TBM jacking force of different partitions of the soft and hard excavation section according to the advancing frictional resistance of the cutter head panel and the rock mass, the frictional resistance of the machine body shell and the stratum, the advancing normal force of the cutter acting on the soft and hard rock mass, the soil chamber pressure at the cutter head opening, the traction trailer resistance, and the frictional resistance of the segment and the shield tail.

2. The method for calculating the thrust force of a TBM according to claim 1, wherein: In step one, the process of calculating the advancing frictional resistance of the cutter head panel and the rock mass comprises the following steps: Step 101, calculate the vertical micro-element earth pressure suffered by the cutter head panel composite rock stratum according to the formula , calculate the vertical micro-element earth pressure suffered by the cutter head panel composite rock stratum according to the formula , calculate the vertical micro-element earth pressure suffered by the cutter head panel composite rock stratum according to the formula , calculate the vertical micro-element earth pressure suffered by the cutter head panel composite rock stratum according to the formula , wherein, is the distance from the top of the cutter head to the ground, unit ; is the unit weight of the soil, unit ; is the radius of the cutter head, unit ; is the distance from the calculation point to the center of the cutter head, unit ; is the included angle between the calculation point and the horizontal line of the cutter head, unit °; is the static earth pressure coefficient, ; is the internal friction angle of the soil; Step 102, calculate the lateral earth pressure of the composite rock stratum acting on the cutter head panel, divide the rock stratum boundary line into and , and express it as follows according to the distance between the rock stratum boundary line and the ground surface: When the soft and hard rock layer boundary line is above the cutter head horizontal line, , , , , wherein, and are the advancing frictional forces of the upper and lower soft and hard rock bodies, respectively, in kN / m2; and are angle parameters related to the rock layer interface, in °; is the distance from the soil layer interface to the ground surface, in m; ; and are the specific weights of the upper and lower soft and hard rock bodies, respectively, in kN / m3; ; and are the internal friction angles of the upper and lower soft and hard rock bodies, respectively, in °; When the soft and hard rock layer boundary line coincides with the cutter head horizontal line, , ; When the soft and hard rock layer boundary line is below the cutter head horizontal line, , , , ; Step 103, calculate the thrust drag of the cutterhead considering the effect of the cutterhead opening is: wherein, is the opening rate of the cutterhead.

3. The method of claim 2, wherein the method is characterized in that: In step two, the process of calculating the frictional resistance of the machine body shell and the surrounding rock mass comprises the following steps: Step 201, according to the formula Vertical earth pressure on the computer casing According to the formula Lateral earth pressure on the computer casing Based on the vertical earth pressure on the TBM casing and lateral earth pressure Earth pressure per unit length in the radial direction at the contact surface between the computer casing and the rock mass ; Step 202, since the lower half of the TBM shell is subject to frictional resistance during the process of the TBM self-weight component, the micro-unit of the TBM body on the shell surface is calculated according to the formula , , is the TBM main machine weight, the unit is ; is the body length, the unit ; Step 203, calculate the radial earth pressure of the composite rock stratum acting on the TBM machine body shell, divide the rock stratum boundary line into and according to the distance between the rock stratum boundary line and the ground surface, and calculate the friction resistance according to the position of the stratum boundary line and the horizontal line of the cutter head. When the boundary line of soft and hard rock layers is above the horizontal line of the cutter head, , , and are the frictional resistances of the upper and lower soft and hard rock bodies to the machine body shell. When the soft and hard rock layer boundary line coincides with the cutter head horizontal line, , ; When the soft and hard rock layer boundary line is below the cutter head horizontal line, , ; are the friction coefficients between the TBM shell and the surrounding soft and hard rock mass, respectively. Step 204, according to the frictional resistance calculation formula between the TBM shell and the surrounding rock mass under different soft and hard partition, the frictional resistance between the machine shell and the stratum is calculated is: .

4. The method of claim 3, wherein the method is characterized in that: In step three, the process of calculating the normal force distribution of a single cutter acting on different strength rock, and superimposing the number of cutters acting on the soft and hard partition to calculate the cutter advancing resistance under the condition of composite stratum comprises the following steps: Step 301, calculating the single roller normal force F according to the formula , wherein, is a dimensionless coefficient, generally taken as 2.12; is the roller blade width; is the single roller radius; is the contact arc of the roller and rock surface and ; is the blade compression coefficient; is the adjacent tool blade spacing; are the compressive strength and tensile strength of the rock, respectively, is the roller penetration degree; Step 302, calculating the resultant force of the cutters in the normal direction according to the number of partitions of the cutters in the soft and hard rock layers and : Step 303, adding the action of different partition rock mass cutter normal force can get the cutter advancing resistance .

5. The method of claim 4, wherein the method is characterized in that: In step four, according to the formula Calculate the soil pressure at the cutterhead opening. According to the formula Calculate the drag resistance of the tractor According to the formula Calculate the frictional resistance between the tunnel segments and the shield tail. ,in, The average pressure of the earthwork; The coefficient of friction between the wheel and the track; The unit is the tare weight of the trailer. ; This represents the number of rings in the tube segments inside the TBM housing; The unit is the self-weight of the lining segment ring. ; The outer diameter of the segment ring is given in units of 1. ; The contact length between the tail brush and the segment ring, in units of ; The pressure of the tail seal brush, in units of ; The number of sealing layers in contact between the shield tail and the tunnel segments; The coefficient of friction between the tail brush and the segment ring is given.

6. The method of claim 5, wherein the method is characterized in that: In step five, according to the formula Calculate the total thrust. By calculating the action area of ​​the thrust cylinder in different zones of soft and hard rock, it can be divided into soft rock sections. and hard rock sections .

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