Shield cutter selection and tunneling parameter optimization method and device, terminal and medium

Abstract

The shield cutter selection and tunneling parameter optimization method, device, terminal and medium provided by the application belong to the technical field of shield construction, and the method comprises the following steps: obtaining stratum information of a target project, selectable types and / or value ranges of shield cutter structure parameters, and value ranges of tunneling parameters; constructing a rock mass discrete element model based on the stratum information; presetting combinations of multiple groups of tunneling parameters and shield cutter structure parameters; for each group of combinations, constructing a corresponding cutter model, and obtaining a rock breaking numerical simulation model based on the cutter model and the rock mass discrete element model; inputting the tunneling parameters in the current combination into the rock breaking numerical simulation model for simulation calculation to obtain rock breaking specific energy and wear specific energy of the cutter; and determining final shield cutter structure parameters and tunneling parameters. The rock breaking specific energy and wear specific energy of the cutter can be obtained by constructing a rock breaking numerical simulation model and performing simulation calculation, and then the cutter structure parameters and tunneling parameters are cooperatively evaluated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shield construction, in particular to a shield cutter selection and tunneling parameter optimization method, device, terminal and medium. BACKGROUND

[0002] As the core rock breaking component of a shield machine, the cutter directly participates in rock breaking during tunneling, and its cutting performance and service life have a decisive influence on tunneling efficiency, construction period and engineering cost. Therefore, reasonably optimizing the cutter structure parameters and tunneling parameters to reduce the overall wear level while ensuring rock breaking efficiency is a key technical path to ensure the continuity and economy of shield construction.

[0003] Currently, some studies have attempted to use empirical formulas, statistical models or neural network methods to predict cutter life or wear trends, but they generally focus on single factor changes and ignore the coupling mechanism between cutter structure parameters and tunneling conditions, making it difficult to effectively evaluate the cutter structure parameters and tunneling parameters.

[0004] Therefore, the prior art has defects and needs to be improved and developed. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a shield cutter selection and tunneling parameter optimization method, device, terminal and medium to solve the problem that the prior art cannot effectively evaluate the cutter structure parameters and tunneling parameters.

[0006] The technical solution adopted by the present application to solve the technical problem is as follows:

[0007] In a first aspect, the present application provides a shield cutter selection and tunneling parameter optimization method, which comprises:

[0008] Obtaining stratum information of a target project, selectable types and / or value ranges of shield cutter structure parameters, and value ranges of tunneling parameters;

[0009] Building a rock discrete element model based on the stratum information;

[0010] Presetting multiple combinations of shield cutter structure parameters and tunneling parameters within the selectable types and / or value ranges of the shield cutter structure parameters and the value ranges of the tunneling parameters;

[0011] For each combination, a corresponding cutter model is built, and a rock breaking numerical simulation model is obtained based on the cutter model and the rock discrete element model. The tunneling parameters in the current combination are input into the rock breaking numerical simulation model for simulation calculation to obtain the rock breaking specific energy and wear specific energy of the cutter;

[0012] Based on the rock breaking specific energy and the abrasion specific energy of all combinations, the final structure parameters of the shield cutter and the tunneling parameters are determined.

[0013] In an embodiment, a rock breaking numerical simulation model is obtained based on the cutter model and the rock mass discrete element model, comprising:

[0014] The cutter model and the rock mass discrete element model are coupled by using a preset coupling interface to obtain a rock breaking numerical simulation model;

[0015] The abrasion algorithm is embedded in the coupling interface.

[0016] In an embodiment, the tunneling parameters in the current combination are input into the rock breaking numerical simulation model for simulation calculation to obtain the rock breaking specific energy and the abrasion specific energy of the cutter, comprising:

[0017] The tunneling parameters in the current combination are respectively input into the rock mass discrete element model and the cutter model of the rock breaking numerical simulation model, the rock mass broken volume, the cutter cutting combined force and the contact force are obtained through the rock mass discrete element model processing, the cutting trajectory length, the cutter unit time contact point slip distance, and the contact grid area of the cutter and the rock mass are obtained through the cutter model processing;

[0018] The cutter abrasion volume is calculated by the embedded abrasion algorithm according to the contact force and the cutter unit time contact point slip distance;

[0019] The rock breaking specific energy of the cutter is obtained based on the cutter cutting combined force, the cutting trajectory length and the rock mass broken volume;

[0020] The abrasion specific energy of the cutter is obtained based on the cutter abrasion volume, the contact grid area and the rock mass broken volume.

[0021] In an embodiment, the rock breaking specific energy of the cutter is obtained based on the cutter cutting combined force, the cutting trajectory length and the rock mass broken volume, comprising:

[0022] The cutter cutting combined force, the cutting trajectory length and the rock mass broken volume are substituted into a preset rock breaking specific energy calculation formula to obtain the rock breaking specific energy of the cutter;

[0023] The rock breaking specific energy calculation formula is: , is the cutter cutting combined force, is the cutting trajectory length, is the rock mass broken volume.

[0024] In an embodiment, the abrasion specific energy of the cutter is obtained based on the cutter abrasion volume, the contact grid area and the rock mass broken volume, comprising:

[0025] obtaining a radial wear of the cutter based on the cutter wear volume and the contact grid area;

[0026] obtaining a wear specific energy of the cutter based on the radial wear of the cutter and the rock breaking volume.

[0027] In an embodiment, final cutter structure parameters and tunneling parameters are determined based on the overall combined rock breaking specific energy and wear specific energy, including:

[0028] normalizing the rock breaking specific energy and the wear specific energy of each combination respectively to obtain normalized rock breaking specific energy and normalized wear specific energy;

[0029] substituting the normalized rock breaking specific energy and the normalized wear specific energy of each combination into a preset comprehensive index calculation formula to obtain a corresponding comprehensive index;

[0030] selecting the cutter structure parameters and the tunneling parameters corresponding to the smallest comprehensive index among all the comprehensive indexes as the final cutter structure parameters and the tunneling parameters.

[0031] In an embodiment, the calculation formula of the comprehensive index is: ; wherein, and is a preset weight coefficient, is the normalized rock breaking specific energy, is the normalized wear specific energy.

[0032] In a second aspect, the embodiments of the present application also provide a shield cutter structure parameter and tunneling parameter optimization device, which comprises:

[0033] a data acquisition module configured to acquire stratum information of a target project, selectable types and / or value ranges of shield cutter structure parameters, and value ranges of tunneling parameters;

[0034] a construction module configured to construct a rock body discrete element model based on the stratum information;

[0035] a numerical preset module configured to preset a plurality of combinations of shield cutter structure parameters and tunneling parameters within the selectable types and / or value ranges of the shield cutter structure parameters and the value ranges of the tunneling parameters;

[0036] a calculation module configured to, for each combination, construct a corresponding cutter model, obtain a rock breaking numerical simulation model based on the cutter model and the rock body discrete element model, input the tunneling parameters in the current combination into the rock breaking numerical simulation model for simulation calculation, and obtain a rock breaking specific energy and a wear specific energy of the cutter;

[0037] The parameter determination module is used to determine the final shield cutter head structure parameters and tunneling parameters based on the rock breaking energy and wear energy of all combinations.

[0038] Thirdly, embodiments of the present invention also provide a terminal, the terminal comprising: a memory, a processor, and a shield cutterhead selection and tunneling parameter optimization program stored in the memory and executable on the processor, wherein when the shield cutterhead selection and tunneling parameter optimization program is executed by the processor, the shield cutterhead selection and tunneling parameter optimization program implements the steps of the shield cutterhead selection and tunneling parameter optimization method as described above.

[0039] Fourthly, embodiments of the present invention also provide a computer-readable storage medium storing a shield cutterhead selection and tunneling parameter optimization program, which can be executed to implement the steps of the shield cutterhead selection and tunneling parameter optimization method as described above.

[0040] The beneficial effects of this invention are as follows: This invention obtains the geological information of the target project, the selectable types and / or value ranges of the shield tunnel cutterhead structural parameters, and the value ranges of the tunneling parameters; constructs a rock mass discrete element model based on the geological information; presets multiple combinations of tunneling parameters and shield tunnel cutterhead structural parameters; for each combination, constructs a corresponding cutterhead model, and obtains a rock-breaking numerical simulation model based on the cutterhead model and the rock mass discrete element model; inputs the tunneling parameters in the current combination into the rock-breaking numerical simulation model for simulation calculation to obtain the rock-breaking specific energy and wear specific energy of the cutterhead; and determines the final shield tunnel cutterhead structural parameters and tunneling parameters. This invention, by constructing a rock-breaking numerical simulation model and performing simulation calculations, can obtain the rock-breaking specific energy and wear specific energy of the cutterhead, thereby enabling a collaborative evaluation of the cutterhead structural parameters and tunneling parameters. Attached Figure Description

[0041] Figure 1 This is a flowchart of a preferred embodiment of the shield cutterhead selection and tunneling parameter optimization method in this invention.

[0042] Figure 2 This is a schematic diagram of the rock-breaking energy and wear energy under different penetration depths in this invention.

[0043] Figure 3 This is a three-dimensional schematic diagram of the comprehensive indicators under different penetration depths and cutterhead rotation speeds in this invention.

[0044] Figure 4 This is a schematic diagram of a preferred embodiment of the shield tunnel cutter head structure parameter and tunneling parameter optimization device of the present invention.

[0045] Figure 5 This is a block diagram of the terminal principle of the present invention. Detailed Implementation

[0046] In order to make the objects, technical solutions and advantages of the present application clearer and more explicit, the present application will be further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0047] As the core rock breaking component of a shield machine, the cutter directly participates in rock breaking during tunneling, and its cutting performance and service life have a decisive influence on the tunneling efficiency, construction period and engineering cost. Therefore, reasonably optimizing the cutter structure parameters and tunneling parameters to reduce the overall wear level while ensuring the rock breaking efficiency is a key technical path to ensure the continuity and economy of shield construction.

[0048] At present, some studies have attempted to use empirical formulas, statistical models or neural network methods to predict the service life or wear trend of the cutter, but they generally focus on single factor changes and ignore the coupling mechanism between the cutter structure parameters and the tunneling conditions, which cannot effectively evaluate the cutter structure parameters and tunneling parameters in coordination.

[0049] In view of the above defects of the prior art, the present application provides a shield cutter selection and tunneling parameter optimization method, device, terminal and medium, which comprises the following steps: obtaining stratum information of a target project, a range of shield cutter structure parameters and a range of tunneling parameters; constructing a rock mass discrete element model based on the stratum information and establishing a parameterized shield cutter finite element template; presetting a plurality of combinations of tunneling parameters and shield cutter structure parameters; for each combination, adjusting the shield cutter finite element template to obtain a cutter model, obtaining a rock breaking numerical simulation model based on the cutter model and the rock mass discrete element model, inputting the tunneling parameters into the rock breaking numerical simulation model for simulation calculation, obtaining the rock breaking specific energy and the wear specific energy of the cutter; and determining the final shield cutter structure parameters and tunneling parameters. The present application can effectively evaluate the cutter structure parameters and tunneling parameters in coordination by constructing a rock breaking numerical simulation model and performing simulation calculation.

[0050] Please refer to Figure 1 The shield cutter selection and tunneling parameter optimization method described in the embodiments of the present application comprises the following steps:

[0051] Step S100, obtaining stratum information of a target project, a range of shield cutter structure parameters and / or a range of tunneling parameters.

[0052] Specifically, the geological information includes the uniaxial compressive strength of the rock, the RQD (Rock Quality Designation) value, and the surrounding rock integrity level. The shield cutterhead structural parameters include cutter length, cutting edge angle, cutting edge width, cutting edge shape, and fillet radius (i.e., the radius of the arc of the cutterhead edge). The cutting edge shape has two options: rounded and flat. The cutter length, cutting edge angle, cutting edge width, and fillet radius have corresponding value ranges. The tunneling parameters are at least two of the following: cutterhead thrust, advance speed, cutterhead torque, cutterhead rotation speed, and penetration depth, and each tunneling parameter has a corresponding value range.

[0053] Please see Figure 1 The shield cutterhead selection and tunneling parameter optimization method described in this embodiment of the invention further includes the following steps:

[0054] Step S200: Construct a discrete element model of the rock mass based on the stratigraphic information.

[0055] Specifically, the EDEM (Element Discrete Element Method) software was used to construct a rock mass discrete element model based on stratigraphic information. This rock mass discrete element model was used to simulate discontinuous behaviors such as fracture, spalling and separation between particles.

[0056] Please see Figure 1 The shield cutterhead selection and tunneling parameter optimization method described in this embodiment of the invention further includes the following steps:

[0057] Step S300: Within the selectable types and value ranges of the shield cutterhead structural parameters, and within the value range of the tunneling parameters, preset multiple combinations of tunneling parameters and shield cutterhead structural parameters.

[0058] Specifically, select the available types of cutting edge, and select the corresponding parameter values ​​for cutting edge length, cutting edge angle, cutting edge width, and fillet radius from the corresponding value ranges, and select the parameter values ​​for each tunneling parameter from the value range of the tunneling parameters.

[0059] Please see Figure 1 The shield cutterhead selection and tunneling parameter optimization method described in this embodiment of the invention further includes the following steps:

[0060] Step S400: Construct a cutter model for each combination, and obtain a rock breaking numerical simulation model based on the cutter model and the rock mass discrete element model. Input the tunneling parameters into the rock breaking numerical simulation model for simulation calculation to obtain the rock breaking specific energy and wear specific energy of the cutter.

[0061] Specifically, for the shield cutter structure parameters in each group of combinations, a corresponding cutter model is established by using ANSYS software. Then, the cutter model and the rock mass discrete element model are coupled by using a preset coupling interface to obtain a rock breaking numerical simulation model; wherein, the coupling interface is embedded with a wear algorithm. The preset coupling interface can couple the EDEM software and the ANSYS software, so that the solvers of the two can exchange data, and thus the mechanical transmission when the cutter and the rock mass are in contact is realized. Meanwhile, the wear algorithm based on the Archard wear theory is introduced in the coupling interface.

[0062] In an implementation manner, the tunneling parameters are input into the rock breaking numerical simulation model for simulation calculation to obtain the rock breaking specific energy and the wear specific energy of the cutter, including:

[0063] The tunneling parameters are input into the rock mass discrete element model and the cutter model of the rock breaking numerical simulation model respectively, the rock mass broken volume, the cutter cutting combined force and the contact force are obtained through the rock mass discrete element model processing, the cutting trajectory length, the cutter unit time contact point slip distance and the contact grid area of the cutter and the rock mass are obtained through the cutter model processing;

[0064] According to the contact force and the cutter unit time contact point slip distance, the cutter wear volume is calculated through the embedded wear algorithm;

[0065] Based on the cutter cutting combined force, the cutting trajectory length and the rock mass broken volume, the rock breaking specific energy of the cutter is obtained;

[0066] Based on the cutter wear volume, the contact grid area and the rock mass broken volume, the wear specific energy of the cutter is obtained.

[0067] Specifically, the calculation formula corresponding to the wear algorithm is: , wherein, is a preset wear coefficient, is the contact force, is a preset rock surface hardness, is the cutter unit time contact point slip distance, is the cutter wear volume. Through the wear algorithm, the wear amount and the geometric evolution of the finite element cutter surface node can be updated in real time.

[0068] In an implementation manner, based on the cutter cutting combined force, the cutting trajectory length and the rock mass broken volume, the rock breaking specific energy of the cutter is obtained, including:

[0069] The cutter cutting combined force, the cutting trajectory length and the rock mass broken volume are substituted into a preset rock breaking specific energy calculation formula to obtain the rock breaking specific energy of the cutter;

[0070] The rock breaking specific energy calculation formula is: , is a cutting combined force of the disc cutter, is a cutting track length, is a rock breaking volume.

[0071] Specifically, the rock breaking specific energy is a core index for evaluating the shield tunneling efficiency, and can quantify the energy consumed by the disc cutter for breaking unit volume of rock. The rock breaking specific energy of the disc cutter can be effectively calculated through the rock breaking specific energy calculation formula.

[0072] In an implementation manner, based on the disc cutter wear volume, the contact grid area and the rock breaking volume, a wear specific energy of the disc cutter is obtained, including:

[0073] Based on the disc cutter wear volume and the contact grid area, a disc cutter radial wear is obtained.

[0074] Based on the disc cutter radial wear and the rock breaking volume, the wear specific energy of the disc cutter is obtained.

[0075] Specifically, the disc cutter wear volume and the contact grid area are substituted into a disc cutter radial wear formula to obtain the disc cutter radial wear. The disc cutter radial wear formula is: , is the disc cutter radial wear, is the contact grid area. The disc cutter radial wear and the rock breaking volume are substituted into a wear specific energy calculation formula to obtain the wear specific energy of the disc cutter. The wear specific energy calculation formula is: .

[0076] Please refer to Figure 1 The shield disc cutter selection and tunneling parameter optimization method provided by the embodiment of the application further includes the following steps:

[0077] Step S500, based on the rock breaking specific energy and the wear specific energy of all combinations, final shield disc cutter structure parameters and tunneling parameters are determined.

[0078] Specifically, the rock breaking specific energy and the wear specific energy of each combination are normalized respectively to obtain normalized rock breaking specific energy and normalized wear specific energy. Normalization can be performed by using the following formula: , is an actual value of an input variable, which can be the rock breaking specific energy or the wear specific energy. is a maximum value of the input variable, is a minimum value of the input variable, Represent normalized values. When calculating the normalized rock breaking specific energy, the rock breaking specific energy can be taken as the actual value of the input variable, the maximum value of the rock breaking specific energy corresponding to all combinations can be taken as the maximum value of the input variable, and the minimum value of the rock breaking specific energy corresponding to all combinations can be taken as the minimum value of the input variable. Similarly, when calculating the normalized wear specific energy, the wear specific energy can be taken as the actual value of the input variable, the maximum value of the wear specific energy corresponding to all combinations can be taken as the maximum value of the input variable, and the minimum value of the wear specific energy corresponding to all combinations can be taken as the minimum value of the input variable.

[0079] After normalization, the normalized rock breaking specific energy and the normalized wear specific energy of each combination are substituted into a preset comprehensive index calculation formula to obtain the corresponding comprehensive index. The comprehensive index calculation formula is: ; wherein, and is a preset weight coefficient, is the normalized rock breaking specific energy, is the normalized wear specific energy. and can be adjusted according to different engineering objectives. If is greater than , high-efficiency tunneling is pursued, and if is greater than , wear control is emphasized. Finally, the cutter structure parameters and the tunneling parameters corresponding to the smallest comprehensive index among all the comprehensive indexes are selected as the final cutter structure parameters and the tunneling parameters. The present application unifies the rock breaking specific energy and the wear specific energy into one evaluation system by using the comprehensive index, and thus can screen out parameter combinations that achieve a balance between rock breaking efficiency and cutter durability.

[0080] In an implementation manner, the method further includes:

[0081] The cutter structure parameters, the tunneling parameters, the rock breaking specific energy, the wear specific energy, and the comprehensive index of each combination are subjected to visual processing to generate a two-dimensional or three-dimensional performance cloud chart.

[0082] Specifically, this way can intuitively view the parameters of each combination, facilitating the user's comparison and selection of construction parameters and visual decision-making.

[0083] In an embodiment, for a shield tunnel interval in A area, the final shield cutter structure parameters and the tunneling parameters are determined by using the method of the present application.

[0084] Specifically, stratum information, structure parameter range of a shield tunnel cutter and tunneling parameter range of a shield tunnel in an A area are collected. The average value of the uniaxial compressive strength of the rock in the stratum information is 67.2 MPa, the RQD value range is 81% to 99%, the surrounding rock integrity grade is II, and the rock is a relatively complete rock mass. In the EDEM software, a rock discrete element model is obtained by modeling according to the stratum information using a Bonded-particle model, and the size of the rock particle is set to 2 mm. In the structure parameter of the shield tunnel cutter, the length of the cutter ranges from 10 to 15 inches, the available types of the blade shape are a round blade and a flat blade, the value range of the blade angle is , the value range of the blade width is 10 to 25 mm, and the value range of the radius of the cutter ring blade arc is 10 to 25 mm. In the tunneling parameter, the value range of the cutter head rotating speed is 0.5 to 2.0 rpm, and the penetration is 0 to 10 mm. Different parameter combinations are preset according to the above value ranges to simulate different working conditions.

[0085] The table of the parameter combinations is shown in Table 1.

[0086] Table 1

[0087]

[0088] For each combination, a cutter model is constructed based on the structure parameter of the shield tunnel cutter, wherein the friction coefficient k is set to . Then, the rock breaking numerical simulation model corresponding to each combination is obtained by combining the cutter model and the rock discrete element model.

[0089] The penetration and the cutter head rotating speed of each combination are substituted into the corresponding rock breaking numerical simulation model for processing, so that the rock breaking specific energy and the wear specific energy of the cutter of each combination can be calculated. The schematic diagram of the rock breaking specific energy and the wear specific energy under different penetrations is shown in Figure 2 . The three-dimensional schematic diagram of the corresponding comprehensive index under different penetrations and cutter head rotating speeds is shown in Figure 3 . After the rock breaking specific energy and the wear specific energy of the cutter of each combination are normalized, the corresponding comprehensive index is calculated. At this time, the and in the comprehensive index calculation formula are set to 0.5, respectively. After calculation, the minimum value of the comprehensive index is determined, and the cutter structure parameter and the tunneling parameter corresponding to the minimum value are determined as the final cutter structure parameter and the final tunneling parameter. The final cutter structure parameter is: the blade shape is a round blade, the blade width is 20 mm, the blade angle is , and the radius of the round corner is 10 mm; and the final tunneling parameter is: the penetration is 5.48 mm, and the cutter head rotating speed is 0.5 rpm.

[0090] Further, the and Different values are set respectively, the corresponding penetration and cutter head rotating speed are calculated under the condition of fixing the structure parameters of the shield cutter, so that the user can make decisions for different construction targets.

[0091] The calculation results are shown in Table 2:

[0092] Table 2

[0093]

[0094] The method of the application can effectively identify the optimal balance point of rock breaking and wear, realize early prediction of cutter wear and improvement of tunneling efficiency, and the optimization results have high consistency and guidance in the actual tunneling process, especially suitable for cutter configuration decision and construction parameter regulation in complex geological environment, and have good practical value and engineering popularization prospect.

[0095] In summary, the shield cutter selection and tunneling parameter optimization method provided by the application can comprehensively consider the coupling relationship between the cutter structure parameters, geological conditions and tunneling parameters, establish a rock breaking numerical simulation model of the rock breaking and wear process of the cutter, quantitatively evaluate the rock breaking specific energy and wear specific energy under each parameter combination, and realize the collaborative optimization of cutter selection and construction parameter configuration through the construction of a comprehensive index. The method of the application can be integrated into a shield construction auxiliary decision system to provide optimization suggestions for cutter selection and construction parameter adjustment in different geological sections.

[0096] In one embodiment, as shown in Figure 4 Based on the above shield cutter selection and tunneling parameter optimization method, the application also correspondingly provides a shield cutter structure parameter and tunneling parameter optimization device, which comprises:

[0097] A data acquisition module 100 is configured to acquire stratum information of a target project, selectable types and / or value ranges of shield cutter structure parameters, and value ranges of tunneling parameters.

[0098] A construction module 200 is configured to construct a rock mass discrete element model based on the stratum information.

[0099] A numerical preset module 300 is configured to preset a plurality of combinations of shield cutter structure parameters and tunneling parameters within the selectable types and / or value ranges of the shield cutter structure parameters and the value ranges of the tunneling parameters.

[0100] The computing module 400 is configured to, for each combination, construct a corresponding cutter model, and obtain a rock breaking numerical simulation model based on the cutter model and the rock mass discrete element model, input the tunneling parameters in the current combination into the rock breaking numerical simulation model for simulation calculation, and obtain rock breaking specific energy and wear specific energy of the cutter;

[0101] The parameter determining module 500 is configured to determine final shield cutter structure parameters and tunneling parameters based on the rock breaking specific energy and the wear specific energy of all combinations.

[0102] In an embodiment, the device further comprises:

[0103] The coupling unit is configured to couple the cutter model and the rock mass discrete element model by using a preset coupling interface to obtain a rock breaking numerical simulation model, and the coupling interface is embedded with a wear algorithm.

[0104] In an embodiment, the device further comprises:

[0105] The data input unit is configured to input the tunneling parameters in the current combination into the rock mass discrete element model and the cutter model of the rock breaking numerical simulation model respectively, process the rock mass discrete element model to obtain a rock breaking volume, a cutter cutting combined force and a contact force, and process the cutter model to obtain a cutting track length, a cutter unit time contact point slip distance, and a contact grid area of the cutter and the rock mass.

[0106] The first computing unit is configured to calculate a cutter wear volume by using the embedded wear algorithm according to the contact force and the cutter unit time contact point slip distance.

[0107] The second computing unit is configured to obtain a rock breaking specific energy of the cutter based on the cutter cutting combined force, the cutting track length and the rock breaking volume.

[0108] The third computing unit is configured to obtain a wear specific energy of the cutter based on the cutter wear volume, the contact grid area and the rock breaking volume.

[0109] In an embodiment, the device further comprises:

[0110] The rock breaking specific energy calculation unit is configured to substitute the cutter cutting combined force, the cutting track length and the rock breaking volume into a preset rock breaking specific energy calculation formula to obtain the rock breaking specific energy of the cutter; wherein the rock breaking specific energy calculation formula is: , is the cutter cutting combined force, is the cutting track length, is the rock breaking volume.

[0111] In an embodiment, the device further comprises:

[0112] a cutter radial wear calculation unit configured to obtain a cutter radial wear based on the cutter wear volume and the contact grid area;

[0113] a wear specific energy calculation unit configured to obtain a wear specific energy of the cutter based on the cutter radial wear and the rock volume broken;

[0114] In an embodiment, the apparatus further comprises:

[0115] a normalization unit configured to normalize each of the rock broken specific energy and the wear specific energy to obtain a normalized rock broken specific energy and a normalized wear specific energy, respectively;

[0116] a comprehensive index calculation unit configured to substitute each of the normalized rock broken specific energy and the normalized wear specific energy into a preset comprehensive index calculation formula to obtain a corresponding comprehensive index;

[0117] a parameter determination unit configured to select a cutter structure parameter and a tunneling parameter corresponding to a smallest comprehensive index among all the comprehensive indexes as final cutter structure parameter and tunneling parameter.

[0118] Based on the above-mentioned embodiments, the application further provides a terminal, a structure diagram of which can be shown in Figure 5 The terminal comprises a processor, a memory, a network interface and a display screen connected through an apparatus bus. The processor of the terminal is configured to provide computing and control capabilities. The memory of the terminal comprises a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating device and a shield cutter selection and tunneling parameter optimization program. The internal memory provides an environment for the operation of the operating device and the shield cutter selection and tunneling parameter optimization program in the non-volatile storage medium. The network interface of the terminal is configured to communicate with external terminals through network connection. The shield cutter selection and tunneling parameter optimization program, when executed by the processor, implements the steps of any of the shield cutter selection and tunneling parameter optimization methods. The display screen of the terminal can be a liquid crystal display screen or an electronic ink display screen.

[0119] Those skilled in the art can understand that Figure 5 The structure diagram shown in the above-mentioned embodiments is only a schematic diagram of part of the structure related to the application scheme, and does not constitute a limitation on the terminal to which the application scheme is applied. Specifically, the terminal can comprise more or fewer components than those shown in the figure, or combine certain components, or have a different component arrangement.

[0120] In one embodiment, a terminal is provided, which comprises a memory, a processor, and a shield cutter selection and tunneling parameter optimization program stored in the memory and executable on the processor, which, when executed by the processor, implements the steps of any shield cutter selection and tunneling parameter optimization method provided by the embodiments.

[0121] The embodiments of the present application also provide a computer readable storage medium, which stores a shield cutter selection and tunneling parameter optimization program, which, when executed by a processor, implements the steps of any shield cutter selection and tunneling parameter optimization method provided by the embodiments.

[0122] It should be understood that the sequence of the steps in the above embodiments does not mean the order of execution, and the execution order of the processes should be determined according to their functions and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0123] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above functional units and modules is taken as an example, and in actual application, the above functions can be completed by different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiments can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit, and the integrated unit can be realized in the form of hardware or software. In addition, the specific names of each functional unit and module are only for easy distinction, and do not limit the protection scope of the present application. The specific working process of the units and modules in the device can be referred to the corresponding process in the foregoing method embodiments, which will not be described here.

[0124] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described or recorded in detail in a certain embodiment can be referred to the related description of other embodiments.

[0125] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in connection with the embodiments disclosed herein can be realized in electronic hardware or a combination of computer software and electronic hardware. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0126] In the embodiments provided by the present application, it should be understood that the disclosed apparatus / terminal device and method can be implemented in other manners. For example, the embodiments of the apparatus / terminal device described above are merely schematic; for example, the division of the modules or units is only a logical function division; there can be another division manner in actual implementation; for example, a plurality of units or components can be combined or integrated into another apparatus, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings between the units, or the coactions relationship between the units can be implemented by electrical method or mechanical method.

[0127] The above embodiments are merely used to describe the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that; the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalent; and these modifications or replacements do not deviate from the spirit and scope of the technical solutions of the corresponding embodiments, and should be included in the protection scope of the present application.

Claims

1. A method for selecting a type of a shield cutter and optimizing an excavation parameter, the method comprising: determining a type of a shield cutter based on a rock hardness of a tunnel to be excavated; and determining an excavation parameter based on the determined type of the shield cutter. The method comprises: obtaining stratum information of a target project, selectable types and / or value ranges of shield cutter structure parameters, and value ranges of tunneling parameters; constructing a rock mass discrete element model based on the stratum information; presetting a plurality of combinations of shield cutter structure parameters and tunneling parameters within the selectable types and / or value ranges of the shield cutter structure parameters and the value ranges of the tunneling parameters; for each combination, constructing a corresponding cutter model, and coupling the cutter model and the rock mass discrete element model by using a preset coupling interface to obtain a rock breaking numerical simulation model, wherein a wear algorithm has been embedded in the coupling interface, the tunneling parameters in the current combination are input into the rock breaking numerical simulation model for simulation calculation to obtain rock breaking specific energy and wear specific energy of the cutter; determining final shield cutter structure parameters and tunneling parameters based on the rock breaking specific energy and the wear specific energy of all combinations; inputting the tunneling parameters in the current combination into the rock breaking numerical simulation model for simulation calculation to obtain rock breaking specific energy and wear specific energy of the cutter, comprising: inputting the tunneling parameters in the current combination into the rock mass discrete element model and the cutter model of the rock breaking numerical simulation model respectively, obtaining rock mass broken volume, cutter cutting resultant force and contact force through the rock mass discrete element model, and obtaining cutting trajectory length, cutter unit time contact point slip distance, and cutter and rock mass contact grid area through the cutter model; calculating cutter wear volume according to the contact force and the cutter unit time contact point slip distance by using the embedded wear algorithm; substituting the cutter cutting resultant force, the cutting trajectory length and the rock mass broken volume into a preset rock breaking specific energy calculation formula to obtain the rock breaking specific energy of the cutter; The rock breaking specific energy calculation formula is: , is the combined force of cutting, is the cutting track length, is the rock breaking volume; obtaining cutter radial wear based on the cutter wear volume and the contact grid area; obtaining the wear specific energy of the cutter based on the cutter radial wear and the rock mass broken volume.

2. The method according to claim 1, characterized in that, determining final cutter structure parameters and tunneling parameters based on the rock breaking specific energy and the wear specific energy of all combinations, comprising: normalizing the rock breaking specific energy and the wear specific energy of each combination to obtain normalized rock breaking specific energy and normalized wear specific energy; substituting the normalized rock breaking specific energy and the normalized wear specific energy of each combination into a preset comprehensive index calculation formula to obtain a corresponding comprehensive index; selecting cutter structure parameters and tunneling parameters corresponding to the smallest comprehensive index among all the comprehensive indexes as the final cutter structure parameters and tunneling parameters.

3. The method according to claim 2, characterized in that, The calculation formula of the comprehensive index is: ; wherein, and is a preset weight coefficient, is a normalized rock breaking specific energy, is a normalized wear specific energy.

4. A device for optimizing the parameters of a tunneling shield and the parameters of a tunneling cutter, characterized in that, comprising: a data acquisition module for obtaining stratum information of a target project, selectable types and / or value ranges of shield cutter structure parameters, and value ranges of tunneling parameters; a construction module for constructing a rock mass discrete element model based on the stratum information; a numerical presetting module for presetting a plurality of combinations of shield cutter structure parameters and tunneling parameters within the selectable types and / or value ranges of the shield cutter structure parameters and the value ranges of the tunneling parameters; The computing module is configured to, for each combination, construct a corresponding cutter model, and couple the cutter model and the rock mass discrete element model by using a preset coupling interface to obtain a rock breaking numerical simulation model, wherein a wear algorithm has been embedded in the coupling interface; and input the tunneling parameters in the current combination into the rock breaking numerical simulation model for simulation calculation to obtain rock breaking specific energy and wear specific energy of the cutter. The simulation calculation of the rock breaking numerical simulation model by inputting the tunneling parameters in the current combination comprises: The simulation calculation of the rock breaking numerical simulation model by inputting the tunneling parameters in the current combination comprises: The simulation calculation of the rock breaking numerical simulation model by inputting the tunneling parameters in the current combination comprises: The simulation calculation of the rock breaking numerical simulation model by inputting the tunneling parameters in the current combination comprises: The rock breaking specific energy calculation formula is: , is the combined force of cutting, is the cutting track length, is the rock breaking volume; The simulation calculation of the rock breaking numerical simulation model by inputting the tunneling parameters in the current combination comprises: The parameter determination module is configured to determine the final shield cutter structure parameters and tunneling parameters based on the rock breaking specific energy and the wear specific energy of all combinations. The terminal comprises a memory, a processor, and a shield cutter selection and tunneling parameter optimization program stored on the memory and executable on the processor, and the shield cutter selection and tunneling parameter optimization program, when executed by the processor, implements the steps of the shield cutter selection and tunneling parameter optimization method according to any one of claims 1-3.

5. A terminal, characterized by comprising: The computer readable storage medium stores a shield cutter selection and tunneling parameter optimization program, and the shield cutter selection and tunneling parameter optimization program, when executed by the processor, implements the steps of the shield cutter selection and tunneling parameter optimization method according to any one of claims 1-3.

6. A computer-readable storage medium, characterized in that, ​

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