Complex stratum shield construction unearthing amount calculation method and back break real-time monitoring method

Abstract

The invention relates to a composite stratum shield construction unearthing amount calculation method and an over-excavation and under-excavation real-time monitoring method. The method is suitable for the technical field of shield tunnel construction. According to the technical scheme adopted by the invention, the method for calculating the unearthed amount of the shield construction of the composite stratum comprises the following steps: determining the actual unearthed weight of the shield construction based on the slag discharge weight of each slag car and the weight of an added tunneling auxiliary material in the shield construction process; based on the sectional area ratio of each type of stratum in the shield construction section and the soil density of each type of stratum, the average soil density of the composite stratum penetrated by the shield construction is determined; and determining the actual earthwork volume of the shield construction based on the actual earthwork weight of the shield construction and the average soil density of the composite stratum penetrated by the shield construction. According to the method, the average soil density of the composite stratum is determined by combining the sectional area ratio of each type of stratum in the shield construction section with the soil density of each type of stratum, and the actual earthwork volume is accurately calculated by combining the measured actual earthwork weight.

Description

Technical Field

[0001] The invention relates to a method for calculating the excavation volume of shield construction in composite strata and a method for real-time monitoring of over-excavation and under-excavation, and is applicable to the technical field of shield tunnel construction. Background Art

[0002] Rail transit is an important direction for urban development. However, during the shield construction process, there is a lack of effective methods for accurate judgment and real-time monitoring of the earth pressure shield machine's excavation warning. The main reasons are: there is no effective and accurate measurement method for measuring the excavation volume; in terms of soil weighing, gantry crane weighing is often used for calculation. When abnormal weighing is found, over-excavation and under-excavation have become established facts, and the loose coefficient is inaccurate. It is difficult and costly to improve the accuracy of excavation volume, and the equipment modification is large. Conventional excavation volume warnings are often delayed and inaccurate, which increases the risk of shield construction. Summary of the invention

[0003] The technical problem to be solved by the present invention is: in view of the above-mentioned existing problems, a method for calculating the excavation volume of shield construction in composite strata and a method for real-time monitoring of over-excavation and under-excavation are provided.

[0004] The technical solution adopted by the present invention is: a method for calculating the excavation volume of shield construction in composite strata, characterized by comprising:

[0005] Based on the weight of slag discharged by each slag truck and the weight of auxiliary materials added during shield construction, the actual excavation weight of shield construction is determined;

[0006] Based on the cross-sectional area ratio of each type of stratum in the shield construction section and the soil density of each type of stratum, the average soil density of the composite stratum that the shield construction passes through is determined;

[0007] Based on the actual excavated weight of the shield construction and the average soil density of the composite stratum that the shield construction passes through, the actual excavated volume of the shield construction is determined.

[0008] The cross-sectional area ratio of each type of stratum in the shield construction section includes:

[0009] Obtain the top elevation of each type of stratum in the shield construction section;

[0010] Calculate the area of ​​each type of stratum based on the top elevation of each type of stratum and the radius of the shield construction section;

[0011] Based on the area calculation of each type of stratum and the area of ​​the shield construction section, the cross-sectional area ratio of each type of stratum is calculated.

[0012] The method of determining the average soil density of the composite stratum traversed by the shield construction based on the cross-sectional area ratio of each type of stratum and the soil density of each type of stratum includes:

[0013] ρ=∑a i ρ i

[0014] Where ρ is the average soil density of the composite stratum; a i is the cross-sectional area ratio of the i-th type of stratum; ρ i is the soil density of the i-th type of stratum; i is a positive integer from 1 to n, and n is the number of each type of stratum in the shield construction section.

[0015] A real-time monitoring method for over-excavation and under-excavation of shield construction in composite strata, characterized by comprising:

[0016] Calculate the theoretical earthwork volume of shield tunneling based on the tunneling mileage of the shield machine and the cross-sectional area of ​​shield construction;

[0017] Based on the weight of slag discharged by each slag truck and the weight of auxiliary excavation materials added during shield construction, the actual excavation weight of shield construction is determined;

[0018] Based on the cross-sectional area ratio of each type of stratum in the shield construction section and the soil density of each type of stratum, the average soil density of the composite stratum that the shield construction passes through is determined;

[0019] Based on the actual excavation weight of shield construction and the average soil density of the composite stratum through which the shield construction passes, the actual excavation volume of shield construction is determined;

[0020] Based on the difference between the theoretical excavation volume and the actual excavation volume corresponding to the same excavation mileage, the over-excavation and under-excavation situation and the warning level are determined.

[0021] The theoretical earthwork volume of shield tunneling is calculated based on the tunneling mileage of the shield machine and the cross-sectional area of ​​the shield construction, including:

[0022] Based on the shield machine's cutterhead excavation diameter d, determine the cross-sectional area of ​​the shield construction;

[0023] Based on the initial cutterhead mileage K1 of the current ring excavation and the cutterhead mileage K2 after excavating a certain distance, the shield machine excavation mileage is determined;

[0024] Calculate the theoretical earthwork volume of shield tunneling based on the cross-sectional area and excavation mileage;

[0025]

[0026] Among them, V1 is the theoretical excavated volume.

[0027] The cross-sectional area ratio of each type of stratum in the shield construction section includes:

[0028] Obtain the top elevation of each type of stratum in the shield construction section;

[0029] Calculate the area of ​​each type of stratum based on the top elevation of each type of stratum and the radius of the shield construction section;

[0030] Based on the area calculation of each type of stratum and the area of ​​the shield construction section, the cross-sectional area ratio of each type of stratum is calculated.

[0031] The method of determining the average soil density of the composite stratum traversed by the shield construction based on the cross-sectional area ratio of each type of stratum and the soil density of each type of stratum includes:

[0032] ρ=∑a i ρ i

[0033] Where ρ is the average soil density of the composite stratum; a i is the cross-sectional area ratio of the i-th type of stratum; ρ i is the soil density of the i-th type of stratum; i is a positive integer from 1 to n, and n is the number of each type of stratum in the shield construction section.

[0034] The difference between the theoretical excavation volume and the actual excavation volume corresponding to the same excavation mileage is used to determine the over-excavation and under-excavation situation and the warning level, including:

[0035] When the actual excavation volume V2>the theoretical excavation volume V1, it indicates that over-excavation occurs during the shield construction process;

[0036] When the actual excavated volume V2 is less than the theoretical excavated volume V1, it indicates that under-excavation occurs during shield construction. The warning level is determined based on the deviation value △V between the calculated volume and the theoretical volume.

[0037] △V=V2-V1

[0038] The warning level is determined based on the ratio of the absolute value of the deviation to the theoretical excavation volume. When it is less than 3%, it is the allowable deviation value, 3% to 5% is a yellow warning, 5% to 7% is an orange warning, and greater than or equal to 7% is a red warning.

[0039] A real-time monitoring device for over-excavation and under-excavation of shield construction in composite strata, characterized by comprising:

[0040] Theoretical volume calculation module, used to calculate the theoretical excavation volume of shield tunneling based on the tunneling mileage of the shield machine and the cross-sectional area of ​​the shield construction;

[0041] The actual weight calculation module is used to determine the actual unearthed weight of the shield construction based on the slag discharge weight of each slag truck and the weight of the added excavation auxiliary materials during the shield construction process;

[0042] The average density calculation module is used to determine the average soil density of the composite stratum that the shield construction passes through based on the cross-sectional area ratio of each type of stratum in the shield construction section and the soil density of each type of stratum;

[0043] The actual volume calculation module is used to determine the actual volume of earth excavated during shield construction based on the actual weight of earth excavated during shield construction and the average soil density of the composite strata traversed by the shield construction;

[0044] The judgment and warning module is used to determine the over-excavation and under-excavation situation and the warning level based on the difference between the theoretical excavation volume and the actual excavation volume corresponding to the same excavation mileage.

[0045] A storage medium stores a computer program executable by a processor, wherein the computer program implements the steps of the method when executed.

[0046] A data processing device comprises a memory and a processor, wherein the memory stores a computer program executable by the processor, and is characterized in that the steps of the method are implemented when the computer program is executed.

[0047] A real-time monitoring system for over-excavation and under-excavation of shield tunneling in composite strata, characterized by comprising:

[0048] The excavation mileage collection unit is installed on the shield machine and is used to collect the excavation mileage of the shield machine;

[0049] A weighing sensor is arranged on the base of the slag car to collect the slag discharge weight of the slag car;

[0050] Auxiliary material usage sensor, installed on the shield machine, is used to measure the weight of the auxiliary materials added for excavation;

[0051] A data processing unit is in communication with the excavation mileage collection unit, the weighing sensor and the auxiliary material consumption sensor, and has a memory and a processor. The memory stores a computer program that can be executed by the processor. When the computer program is executed, the steps of the over-excavation and under-excavation real-time monitoring method are implemented;

[0052] A monitoring display screen is connected to the data processing unit and is used to display over-excavation and under-excavation conditions and warning levels.

[0053] The beneficial effect of the present invention is that the present invention utilizes the cross-sectional area ratio of each type of stratum in the shield construction section and the soil density of each type of stratum to determine the average soil density of the composite stratum, and combines the measured actual excavated weight to accurately calculate the actual excavated volume.

[0054] The present invention calculates the theoretical excavation volume of shield tunneling based on the tunneling mileage of the shield machine and the cross-sectional area of ​​the shield construction, and compares it with the actual excavation volume calculated based on the actual excavation weight and the average soil density of the composite stratum, analyzes whether there is over-excavation or under-excavation in the current excavation volume, and adjusts the tunneling parameters in time to ensure that the excavation volume remains within a reasonable range, effectively reducing the risk of surface heave and subsidence warning.

[0055] The present invention utilizes a weighing sensor to collect the weight of a slag truck in real time, and associates the collected weight parameters of the slag truck with an operating system in real time through wireless data transmission, calculates the real-time slag discharge volume through the weight change of the slag truck, and compares the actual excavated volume with the theoretical volume of the shield machine during excavation, thereby realizing real-time early warning of over-excavation and under-excavation. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 It is a schematic diagram of the theoretical earthwork volume produced by the cutter head of the shield machine in the embodiment.

[0057] Figure 2 It is a geological profile and schematic diagram of the shield machine cutter head excavation surface in the embodiment (the stratum changes gently).

[0058] Figure 3 It is a schematic diagram of the theoretical earthwork volume produced by the cutter head of the shield machine in the embodiment.

[0059] Figure 4 It is a geological profile and schematic diagram of the shield machine cutter head excavation surface in the embodiment (the stratum changes greatly).

[0060] Figure 5 It is a geological profile of the excavation surface and a schematic diagram of the theoretical earthwork volume of the current ring in the embodiment. DETAILED DESCRIPTION

[0061] Embodiment 1: This embodiment is a method for calculating the excavation volume of shield construction in composite strata, which specifically includes the following steps:

[0062] S1. Obtain the slag discharge weight of each slag truck during shield construction and the weight of auxiliary excavation materials added during shield construction, and determine the actual excavated weight of shield construction based on the slag discharge weight of each slag truck during shield construction and the weight of auxiliary excavation materials added.

[0063] The actual excavated weight of shield construction excavation is G, G1 is the weight of the slag discharged by the first slag truck, G2 is the weight of the slag discharged by the second slag truck, and so on, Gn is the weight of the slag discharged by the nth slag truck, and M is the weight of the excavation auxiliary materials added during the shield construction process (including the weight of the cutter head plus water, foam agent and additives, etc.).

[0064] G=G1+G2+…Gn-M

[0065] S2. Obtain the cross-sectional area ratio of each type of stratum in the shield construction section and the soil density of each type of stratum in the geological survey data, and determine the average soil density of the composite stratum traversed by the shield construction based on the cross-sectional area ratio and soil density of each type of stratum.

[0066] In this embodiment, the elevation of the top of each type of stratum in the shield construction section is obtained; the area of ​​each type of stratum is calculated based on the elevation of the top of each type of stratum and the radius of the shield construction section; based on the area calculation of each type of stratum and the area of ​​the shield construction section, the cross-sectional area ratio of each type of stratum is calculated.

[0067] A. When the strata change slowly.

[0068] Assume that the shield construction section contains n different types of strata, and the corresponding cross-sectional areas are S1, S2…Sn, the cutter head excavation bottom elevation is h0, the strata change is gentle, and the top elevations of various strata can be regarded as constants. The top elevations of different strata corresponding to the excavation surface are h1, h2…hn, respectively. The cross-sectional areas of different soil layers are calculated as follows:

[0069] S1=2(S 扇ocb -S △oeb )

[0070]

[0071] Same reason

[0072]

[0073] Among them, hr is the center elevation of the cutter head.

[0074] The soil densities corresponding to different strata are ρ1, ρ2…ρn, and the average soil density of the composite strata passed through by the shield construction is ρ.

[0075]

[0076] B. When the strata change greatly.

[0077] If the strata change greatly, the top elevations of different strata in the same ring will change greatly. The top elevations of various strata corresponding to the current ring starting mileage (K1) can be calculated by interpolation method, which are h1, h2...hn, and the top elevations of various strata corresponding to the current ring ending mileage (K2) are h1', h2'...hn'. The mileage corresponding to the current ring shield excavation to any length is (Kx), the excavation length is (x), and the top elevations of various strata corresponding to are h1x, h2x...hnx. According to the interpolation method, the top elevations of the corresponding strata can be calculated as:

[0078] Then the top elevation of the nth stratum from bottom to top corresponding to the arbitrary length of the current ring is:

[0079]

[0080] Then the cross-sectional area (Snx) corresponding to the nth layer of soil for any length of the current ring is:

[0081]

[0082] Then the volume of the nth stratum (Vnx) corresponding to any length of shield tunneling in the current ring is:

[0083]

[0084] Due to the large changes in the strata at the cutterhead excavation surface, various strata change with the excavation progress, so the corresponding average soil density also changes accordingly. The calculation method of the average soil density (ρx) is as follows:

[0085]

[0086] The detailed survey drawings clearly mark the top elevations of various strata at the exploration holes. The interpolation method can be used to calculate the top elevations of various strata in the corresponding ring numbers between adjacent holes. The areas of different strata in the cutterhead excavation area can then be accurately calculated based on the positional relationship between the top elevations of different strata and the cutterhead excavation surface. The areas of various strata (defined in the detailed survey) are multiplied and superimposed, and then divided by the cutterhead excavation surface to obtain a more accurate average soil density of the composite strata.

[0087] S3. Based on the actual excavated weight of the shield construction and the average soil density of the composite stratum traversed by the shield construction, determine the actual excavated volume V2 of the shield construction.

[0088] When the stratum changes are gentle:

[0089]

[0090] When the stratum changes greatly, when the shield tunneling length is x, the weight of the slag discharge is (Gx), the mass of the cutterhead water and additives is Mx, and the corresponding actual excavation volume (Vx) is:

[0091]

[0092] Embodiment 2: This embodiment is a storage medium on which a computer program that can be executed by a processor is stored. When the computer program is executed, the steps of the method for calculating the excavated volume of shield construction in composite strata in Embodiment 1 are implemented.

[0093] Embodiment 3: This embodiment is a data processing device having a memory and a processor. The memory stores a computer program that can be executed by the processor. When the computer program is executed, the steps of the method for calculating the excavated volume of composite stratum shield construction in Embodiment 1 are implemented.

[0094] Embodiment 4: This embodiment is a real-time monitoring method for over-excavation and under-excavation of shield construction in composite strata, which specifically includes the following steps:

[0095] S1. Calculate the theoretical earthwork volume of shield tunneling based on the tunneling mileage of the shield machine and the cross-sectional area of ​​the shield construction.

[0096] Based on the shield machine's cutterhead excavation diameter d, determine the cross-sectional area of ​​the shield construction; based on the initial cutterhead mileage K1 of the current ring excavation and the cutterhead mileage K2 after excavating a certain distance, determine the shield machine excavation mileage; based on the cross-sectional area and excavation mileage, calculate the theoretical excavation volume V1 of the shield excavation.

[0097]

[0098] S2. Obtain the slag discharge weight of each slag truck during the shield construction process and the weight of the auxiliary excavation materials added during the shield construction process, and determine the actual excavated weight of the shield construction based on the slag discharge weight of each slag truck during the shield construction process and the weight of the auxiliary excavation materials added.

[0099] The actual excavated weight of shield construction excavation is G, G1 is the weight of the slag discharged by the first slag truck, G2 is the weight of the slag discharged by the second slag truck, and so on, Gn is the weight of the slag discharged by the nth slag truck, and M is the weight of the excavation auxiliary materials added during the shield construction process (including the weight of the cutter head plus water, foam agent and additives, etc.).

[0100] G=G1+G2+…Gn-M

[0101] S3. Obtain the cross-sectional area ratio of each type of stratum in the shield construction section and the soil density of each type of stratum in the geological survey data, and determine the average soil density of the composite stratum traversed by the shield construction based on the cross-sectional area ratio and soil density of each type of stratum.

[0102] In this embodiment, the elevation of the top of each type of stratum in the shield construction section is obtained; the area of ​​each type of stratum is calculated based on the elevation of the top of each type of stratum and the radius of the shield construction section; based on the area calculation of each type of stratum and the area of ​​the shield construction section, the cross-sectional area ratio of each type of stratum is calculated.

[0103] Assuming that the shield construction section contains n different types of strata, the corresponding cross-sectional areas are S1, S2...Sn, the cutter head excavation bottom elevation is h0, and the corresponding excavation surface different strata top elevations are h1, h2...hn (hn is the top elevation of the topmost soil layer of the cutter head excavation surface, the cutter head top elevation is taken), then the corresponding cross-sectional areas of different soil layers are calculated as follows:

[0104]

[0105] Same reason

[0106]

[0107] The soil densities corresponding to different strata are ρ1, ρ2... ρn respectively, and the average soil density of the composite stratum traversed by the shield construction is ρ.

[0108]

[0109] S4. Determine the actual excavated volume V2 of the shield construction based on the actual excavated weight during the shield construction and the average soil density of the composite stratum traversed by the shield construction.

[0110]

[0111] S5. Determine the over-excavation and under-excavation conditions and the warning level based on the difference between the theoretical excavated volume V1 and the actual excavated volume V2 corresponding to the same tunneling mileage.

[0112] When V2 > V1, that is, the calculated volume is greater than the theoretical volume, it indicates that over-excavation occurs during the shield construction, which may lead to ground settlement;

[0113] When V2 < V1, that is, the calculated volume is less than the theoretical volume, it indicates that under-excavation occurs during the shield construction, which may lead to ground heave.

[0114] In this embodiment, the warning level is determined according to the magnitude of the deviation value △V between the calculated volume and the theoretical volume;

[0115] △V = V2 - V1

[0116] There are many factors affecting the warning value of the excavated volume, involving geological stability, self-stability, water content, density, strength, etc. Therefore, the warning value of the excavated volume should be practical. The warning value of the excavated volume can be determined in combination with the monitoring data of the test section. The warning level is determined according to the ratio of the absolute value of the deviation to the theoretical excavated volume. When it is less than 3%, it is the allowable deviation value; when it is 3% - 5%, it is a yellow warning; when it is 5% - 7%, it is an orange warning; when it is greater than or equal to 7%, it is a red warning, that is:

[0117] The allowable deviation range of the excavated volume is:

[0118] The yellow warning of the excavated volume is:

[0119] The orange warning of the excavated volume is:

[0120] The red warning of the excavated volume is:

[0121] The following is a specific example to further illustrate that the right line of a shield tunnel passes through a composite stratum. From bottom to top, the strata are clay, gravel, silt, and muddy soil. The bottom elevation of the excavation surface is -12m, the center elevation of the cutterhead is -8.76m, and the top elevations of the four strata from bottom to top are -11m, -9.5m, -7m, and -5.52m. The soil densities of the four strata from bottom to top are 1.9t / m 3 , 2.2t / m 3 , 1.7t / m 3 , 1.4t / m 3 The shield cutter head excavation diameter d is 6.48m.

[0122] There are 4 slag buckets in this section of the battery car. A weighing sensor is set under the slag bucket car, which can share the excavated weight with the shield operation system in real time. The starting range K1 of the current ring is 108.3m, and the shield excavation length of this ring is 1.2m. When the shield excavation length is 0m, 0.3m, 0.6m, 0.9m, and 1.2m, the water added to the cutter head, the amount of foaming agent mixed liquid, and the weight of the slag car are as follows;

[0123]

[0124] According to the public announcement, the cross-sectional area of ​​silty soil is:

[0125]

[0126] Similarly, S2=8.505m 2 、S3=15.569m 2 、S4=5.674m 2

[0127] The average density of the composite stratum soil on the excavation surface is:

[0128]

[0129] The theoretical excavation volumes in the four stages are:

[0130]

[0131] The first stage is to calculate the excavated weight. The density of the foam mixture is approximately the density of water, which is 1t / m 3 .

[0132] G 计算 =G 渣1 -G 车1 -G 水1 -G 泡沫1

[0133] =22.6-3.1-2.3-0.4=16.8t

[0134] The earthwork volume calculated in the first stage is:

[0135]

[0136] The first stage deviation square is:

[0137] △V=V 计算 -V 理论 =9.349-9.894=-0.545m 3

[0138] but

[0139] The slag deviation is between 5% and 7%, which is an orange warning of under-excavation.

[0140] Similarly, the theoretical volume, excavated volume, deviation volume, and deviation rate of the other three stages are:

[0141]

[0142] Embodiment 5: This embodiment is a real-time monitoring device for over-excavation and under-excavation of shield construction in composite strata, including: a theoretical volume calculation module, an actual weight calculation module, an average density calculation module, an actual volume calculation module and a judgment and early warning module, etc.

[0143] In this example, the theoretical volume calculation module is used to calculate the theoretical excavation volume of shield tunneling based on the shield machine's excavation mileage and the cross-sectional area of ​​the shield construction; the actual weight calculation module is used to determine the actual excavation weight of the shield construction based on the slag weight of each slag truck and the weight of the added excavation auxiliary materials during the shield construction process; the average density calculation module is used to determine the average soil density of the composite stratum traversed by the shield construction based on the cross-sectional area proportion of each type of stratum in the shield construction section and the soil density of each type of stratum; the actual volume calculation module is used to determine the actual excavation volume of the shield construction based on the actual excavation weight of the shield construction and the average soil density of the composite stratum traversed by the shield construction; the judgment and warning module is used to determine the over-excavation and under-excavation situation and the warning level based on the difference between the theoretical excavation volume and the actual excavation volume corresponding to the same section of excavation mileage.

[0144] Embodiment 6: This embodiment is a storage medium on which a computer program that can be executed by a processor is stored. When the computer program is executed, the steps of the real-time monitoring method for over-excavation and under-excavation in shield construction in composite strata in Embodiment 4 are implemented.

[0145] Example 7: This example is a data processing device having a memory and a processor. The memory stores a computer program that can be executed by the processor. When the computer program is executed, the steps of the real-time monitoring method for over-excavation and under-excavation in composite stratum shield construction in Example 4 are implemented.

[0146] Embodiment 8: This embodiment is a real-time monitoring system for over-excavation and under-excavation of shield construction in composite strata, including: an excavation mileage collection unit, a weighing sensor, an auxiliary material consumption sensor, a data processing unit and a monitoring display screen, etc.

[0147] In this example, the excavation mileage collection unit is set on the shield machine to collect the excavation mileage of the shield machine; the weighing sensor is set on the base of the slag truck to collect the slag discharge weight of the slag truck; the auxiliary material dosage sensor is set on the shield machine to measure the weight of the added excavation auxiliary materials.

[0148] The data processing unit in this embodiment is communicatively connected with the excavation mileage collection unit, the weighing sensor and the auxiliary material usage sensor, and has a memory and a processor. The memory stores a computer program that can be executed by the processor. When the computer program is executed, the steps of the real-time monitoring method for over-excavation and under-excavation of composite stratum shield construction in Example 4 are implemented.

[0149] In this example, the monitoring display screen is connected to the data processing unit to display the over-excavation and under-excavation conditions and corresponding warning levels output by the data processing unit.

Claims

1. A method for calculating the excavation volume of shield construction in composite strata, characterized in that: include: Based on the weight of slag discharged by each slag truck and the weight of auxiliary materials added during shield construction, the actual excavation weight of shield construction is determined; Based on the cross-sectional area ratio of each type of stratum in the shield construction section and the soil density of each type of stratum, the average soil density of the composite stratum that the shield construction passes through is determined; Based on the actual excavated weight of the shield construction and the average soil density of the composite stratum that the shield construction passes through, the actual excavated volume of the shield construction is determined.

2. The method for calculating the excavation volume of shield construction in composite strata according to claim 1 is characterized in that: The cross-sectional area ratio of each type of stratum in the shield construction section includes: Obtain the top elevation of each type of stratum in the shield construction section; Calculate the area of ​​each type of stratum based on the top elevation of each type of stratum and the radius of the shield construction section; Based on the area calculation of each type of stratum and the area of ​​the shield construction section, the cross-sectional area ratio of each type of stratum is calculated.

3. The method for calculating the excavation volume of shield construction in composite strata according to claim 1 is characterized in that: The method of determining the average soil density of the composite stratum traversed by the shield construction based on the cross-sectional area ratio of each type of stratum and the soil density of each type of stratum includes: p=∑a i r i Where ρ is the average soil density of the composite stratum; a i is the cross-sectional area ratio of the i-th type of stratum; ρ i is the soil density of the i-th type of stratum; i is a positive integer from 1 to n, and n is the number of each type of stratum in the shield construction section.

4. A real-time monitoring method for over-excavation and under-excavation of shield construction in composite strata, characterized in that: include: Calculate the theoretical earthwork volume of shield tunneling based on the tunneling mileage of the shield machine and the cross-sectional area of ​​shield construction; Based on the weight of slag discharged by each slag truck and the weight of auxiliary materials added during shield construction, the actual excavation weight of shield construction is determined; Based on the cross-sectional area ratio of each type of stratum in the shield construction section and the soil density of each type of stratum, the average soil density of the composite stratum that the shield construction passes through is determined; Based on the actual excavation weight of shield construction and the average soil density of the composite stratum through which the shield construction passes, the actual excavation volume of shield construction is determined; Based on the difference between the theoretical excavation volume and the actual excavation volume corresponding to the same excavation mileage, the over-excavation and under-excavation situation and the warning level are determined.

5. The real-time monitoring method for over-excavation and under-excavation of shield construction in composite strata according to claim 4 is characterized in that: The theoretical earthwork volume of shield tunneling is calculated based on the tunneling mileage of the shield machine and the cross-sectional area of ​​the shield construction, including: Based on the shield machine's cutterhead excavation diameter d, determine the cross-sectional area of ​​the shield construction; Based on the initial cutterhead mileage K1 of the current ring excavation and the cutterhead mileage K2 after excavating a certain distance, the shield machine excavation mileage is determined; Calculate the theoretical earthwork volume of shield tunneling based on the cross-sectional area and excavation mileage; Among them, V1 is the theoretical excavated volume.

6. The real-time monitoring method for over-break and under-break of shield construction in composite strata according to claim 4 is characterized in that: The cross-sectional area ratio of each type of stratum in the shield construction section includes: Obtain the top elevation of each type of stratum in the shield construction section; Calculate the area of ​​each type of stratum based on the top elevation of each type of stratum and the radius of the shield construction section; Based on the area calculation of each type of stratum and the area of ​​the shield construction section, the cross-sectional area ratio of each type of stratum is calculated.

7. The real-time monitoring method for over-excavation and under-excavation of shield construction in composite strata according to claim 4 is characterized in that: The method of determining the average soil density of the composite stratum traversed by the shield construction based on the cross-sectional area ratio of each type of stratum and the soil density of each type of stratum includes: p=∑a i r i Where ρ is the average soil density of the composite stratum; a i is the cross-sectional area ratio of the i-th type of stratum; ρ i is the soil density of the i-th type of stratum; i is a positive integer from 1 to n, and n is the number of each type of stratum in the shield construction section.

8. The real-time monitoring method for over-excavation and under-excavation of shield construction in composite strata according to claim 4 is characterized in that: The difference between the theoretical excavation volume and the actual excavation volume corresponding to the same excavation mileage is used to determine the over-excavation and under-excavation situation and the warning level, including: When the actual excavation volume V2>the theoretical excavation volume V1, it indicates that over-excavation occurs during the shield construction process; When the actual excavated volume V2 < the theoretical excavated volume V1, it indicates that under-excavation occurs during the shield construction process; The warning level is determined according to the deviation value △V between the calculated volume and the theoretical volume; △V=V2-V1 The warning level is determined based on the ratio of the absolute value of the deviation to the theoretical excavation volume. When it is less than 3%, it is the allowable deviation value, 3% to 5% is a yellow warning, 5% to 7% is an orange warning, and greater than or equal to 7% is a red warning.

9. A real-time monitoring device for over-excavation and under-excavation of shield construction in composite strata, characterized in that: include: Theoretical volume calculation module, used to calculate the theoretical excavation volume of shield tunneling based on the tunneling mileage of the shield machine and the cross-sectional area of ​​the shield construction; The actual weight calculation module is used to determine the actual unearthed weight of the shield construction based on the slag discharge weight of each slag truck and the weight of the added excavation auxiliary materials during the shield construction process; The average density calculation module is used to determine the average soil density of the composite stratum that the shield construction passes through based on the cross-sectional area ratio of each type of stratum in the shield construction section and the soil density of each type of stratum; The actual volume calculation module is used to determine the actual volume of earth excavated during shield construction based on the actual weight of earth excavated during shield construction and the average soil density of the composite strata traversed by the shield construction; The judgment and warning module is used to determine the over-excavation and under-excavation situation and the warning level based on the difference between the theoretical excavation volume and the actual excavation volume corresponding to the same excavation mileage.

10. A storage medium having stored thereon a computer program executable by a processor, characterized in that: When the computer program is executed, the steps of the method according to any one of claims 1 to 8 are implemented.

11. A data processing device comprising a memory and a processor, wherein the memory stores a computer program executable by the processor, wherein: When the computer program is executed, the steps of the method according to any one of claims 1 to 8 are implemented.

12. A real-time monitoring system for over-excavation and under-excavation of shield construction in composite strata, characterized in that: include: The excavation mileage collection unit is installed on the shield machine and is used to collect the excavation mileage of the shield machine; A weighing sensor is arranged on the base of the slag car to collect the slag discharge weight of the slag car; Auxiliary material usage sensor, installed on the shield machine, is used to measure the weight of the auxiliary materials added for excavation; A data processing unit is connected to the excavation mileage collection unit, the weighing sensor and the auxiliary material consumption sensor in communication, and has a memory and a processor. The memory stores a computer program that can be executed by the processor. When the computer program is executed, the steps of the over-excavation and under-excavation real-time monitoring method according to any one of claims 4 to 8 are implemented; A monitoring display screen is connected to the data processing unit and is used to display over-excavation and under-excavation conditions and corresponding warning levels.

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