Ballast conveying method and system in tunneling process of shield tunneling machine, electronic equipment and storage medium

Abstract

The invention provides a ballast conveying method and system in the tunneling process of a shield tunneling machine, electronic equipment and a storage medium, and the method comprises the steps that physical property parameters in a pipeline are obtained, and the physical property parameters comprise water body parameters, particle parameters and inter-particle parameters; inputting the physical property parameters of the pipeline into a specified model, and drawing a specified ellipsoid based on a Fibonacci spiral method to generate an ellipsoid model; sampling three supporting points of the ellipsoid model to obtain coordinates of the three supporting points; calculating the coordinates of the three supporting points to obtain a stacking angle formed by the three supporting points; under the condition that a stacking angle formed by the three supporting points meets a specified constraint condition, a sliding critical starting flow velocity condition, a rolling critical starting flow velocity condition and a safe starting flow velocity condition are obtained according to the coordinates of the three supporting points; and according to the sliding critical starting flow velocity condition, the rolling critical starting flow velocity condition and the safe starting flow velocity condition, the flow velocity of the ballast conveyed by the pipeline is controlled.

Description

Technical Field

[0001] The present application relates to the technical field of pipeline slag transportation, and in particular to a slag transportation method, a slag transportation system, an electronic device and a storage medium during shield machine excavation. Background Art

[0002] The initiation of particles in flow fields has long been a research hotspot in the field of particle flow dynamics, attracting considerable attention in a variety of practical applications, including debris flows, rock movement in river channels, and pipeline transportation. This is not only due to its theoretical significance, enabling a deeper understanding of the motion and mechanical mechanisms of particles in flow fields, but also plays a key guiding role in practical engineering applications.

[0003] During tunnel excavation, as the diameter of the tunnel continues to increase, the amount of debris and rock produced by the cutting action of the tunnel boring machine cutterhead increases dramatically. In practical engineering, how to smoothly and efficiently discharge this huge amount of debris out of the tunnel becomes a key issue in ensuring tunnel excavation efficiency. Summary of the Invention

[0004] The present application provides a method, system, electronic device, and storage medium for conveying ballast during shield machine excavation to address the problems of related technologies. The technical solution is as follows: In a first aspect, an embodiment of the present application provides a method for conveying ballast during tunneling of a shield machine, comprising: Obtaining physical parameters in the pipeline, wherein the physical parameters include water parameters, particle parameters, and parameters between particles; Inputting the physical property parameters of the pipeline into a designated model, drawing a designated ellipsoid based on the Fibonacci spiral method, and generating an ellipsoid model; Sampling three support points of the ellipsoid model to obtain coordinates of the three support points; Calculating the coordinates of the three support points to obtain a stacking angle formed by the three support points; When the stacking angle formed by the three support points satisfies a specified constraint condition, a sliding critical starting flow rate condition, a rolling critical starting flow rate condition, and a safe starting flow rate condition are obtained according to the coordinates of the three support points; The flow rate of the ballast transported by the pipeline is controlled according to the sliding critical starting flow rate condition, the rolling critical starting flow rate condition and the safety starting flow rate condition.

[0005] In one embodiment, sampling three support points of the ellipsoid model to obtain sampling conditions in the coordinates of the three support points includes: The three support points are all in the lower half of the ellipsoid model, the projections of the three support points on the specified surface will not be on the same straight line, the origin of the elliptical model coordinate system is located in the triangle formed by the three support points, and the distance between any two support points is greater than the specified distance.

[0006] In one embodiment, when the stacking angle formed by the three support points satisfies a specified constraint condition, obtaining the sliding critical starting flow rate condition and the rolling critical starting flow rate condition based on the coordinates of the three support points includes: When the stacking angle formed by the three support points must be less than or equal to the repose angle, the sliding critical starting flow rate conditions and the rolling critical starting flow rate conditions are obtained based on the coordinates of the three support points. The repose angle is the maximum angle between the stable inclined plane formed when the particles are accumulated and the horizontal plane.

[0007] In one embodiment, the coordinates of the three support points are obtained in multiple groups, and obtaining the sliding critical starting flow rate condition, the rolling critical starting flow rate condition, and the safe starting flow rate condition according to the coordinates of the three support points includes: According to the coordinates of the three support points, a plurality of sets of sliding starting flow velocities and a plurality of sets of rolling starting flow velocities are obtained; Selecting a plurality of selected support points from the plurality of sliding start flow rates and the plurality of rolling start flow rates, wherein the speeds of the selected support points are all less than or equal to a specified flow rate, wherein the specified flow rate is a sliding critical start flow rate condition and a rolling critical start flow rate condition; The maximum value of the sliding starting flow rates or the rolling starting flow rates in the plurality of groups of support points is determined as a safe starting flow rate condition.

[0008] In a second aspect, an embodiment of the present application provides a ballast conveying system, comprising: An acquisition module is used to acquire physical parameters in the pipeline, wherein the physical parameters include water parameters, particle parameters, and parameters between particles; A generating module, configured to draw a designated ellipsoid based on the Fibonacci spiral method according to the physical property parameters of the pipeline input into a designated model, thereby generating an ellipsoid model; A first obtaining module is used to sample three support points of the ellipsoid model to obtain the coordinates of the three support points; A second obtaining module is used to calculate the coordinates of the three support points to obtain the stacking angle formed by the three support points; a third obtaining module, configured to obtain, based on the coordinates of the three support points, a sliding critical starting flow rate condition, a rolling critical starting flow rate condition, and a safe starting flow rate condition when the stacking angle formed by the three support points satisfies a specified constraint condition; The control module is used to control the flow rate of the ballast transported by the pipeline according to the sliding critical starting flow rate condition, the rolling critical starting flow rate condition and the safety starting flow rate condition.

[0009] In one embodiment, sampling three support points of the ellipsoid model to obtain sampling conditions in the coordinates of the three support points includes: The three support points are all in the lower half of the ellipsoid model, the projections of the three support points on the specified surface will not be on the same straight line, the origin of the elliptical model coordinate system is located in the triangle formed by the three support points, and the distance between any two support points is greater than the specified distance.

[0010] In one embodiment, when the stacking angle formed by the three support points satisfies a specified constraint condition, obtaining the sliding critical starting flow rate condition and the rolling critical starting flow rate condition based on the coordinates of the three support points includes: When the stacking angle formed by the three support points must be less than or equal to the repose angle, the sliding critical starting flow rate conditions and the rolling critical starting flow rate conditions are obtained based on the coordinates of the three support points. The repose angle is the maximum angle between the stable inclined plane formed when the particles are accumulated and the horizontal plane.

[0011] In one embodiment, the coordinates of the three support points are obtained in multiple groups, and obtaining the sliding critical starting flow rate condition, the rolling critical starting flow rate condition, and the safe starting flow rate condition according to the coordinates of the three support points includes: According to the coordinates of the three support points, a plurality of sets of sliding starting flow velocities and a plurality of sets of rolling starting flow velocities are obtained; Selecting a plurality of selected support points from the plurality of sliding start flow rates and the plurality of rolling start flow rates, wherein the speeds of the selected support points are all less than or equal to a specified flow rate, wherein the specified flow rate is a sliding critical start flow rate condition and a rolling critical start flow rate condition; The maximum value of the sliding starting flow rates or the rolling starting flow rates in the plurality of groups of support points is determined as a safe starting flow rate condition.

[0012] In a third aspect, an embodiment of the present application provides an electronic device comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor so as to enable the at least one processor to execute the above-mentioned method for conveying slag during the excavation process of the shield machine.

[0013] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores computer instructions. When the computer instructions are run on a computer, the method in any one of the above-mentioned embodiments is executed.

[0014] The advantages or beneficial effects of the above technical solution include at least: In this embodiment, the method for conveying slag during the excavation process of the shield machine includes: obtaining physical parameters in the pipeline, wherein the physical parameters include water parameters, particle parameters and parameters between particles; according to the physical parameters of the pipeline, the specified ellipsoid is drawn based on the Fibonacci spiral method to generate an ellipsoid model; three support points are sampled on the ellipsoid model to obtain the coordinates of the three support points; the coordinates of the three support points are calculated to obtain the stacking angle formed by the three support points; when the stacking angle formed by the three support points meets the specified constraint conditions, the sliding critical starting flow rate condition, the rolling critical starting flow rate condition and the safety starting flow rate condition are obtained according to the coordinates of the three support points; according to the sliding critical starting flow rate condition, the rolling critical starting flow rate condition and the safety starting flow rate condition, the flow rate of the slag conveyed by the pipeline is controlled. This effectively solves the problem of how to discharge these huge amounts of debris smoothly and efficiently out of the tunnel, and realizes the prediction of the critical starting flow rate of slag under different morphologies, different postures and different support point distributions, so that during tunnel excavation construction, as the tunnel excavation diameter continues to increase, the number of debris and rock blocks generated by the cutting action of the tunnel boring machine cutter head and tools increases sharply. By obtaining the sliding critical starting flow rate condition, the rolling critical starting flow rate condition and the safe starting flow rate condition, the flow rate of the slag transported in the pipeline is adjusted by controlling the slurry pump, which can effectively improve the excavation efficiency of the tunnel boring machine while ensuring construction safety, avoid the problem of excessive pressure in the slurry pump, and greatly reduce construction costs.

[0015] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present application will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0017] Figure 1 Schematic diagram of a method for conveying ballast during tunneling of a shield machine according to an embodiment of the present application; Figure 2 Schematic diagram of a three-dimensional ellipsoid posture description based on Euler angle transformation in a method for conveying ballast during tunneling of a shield machine according to an embodiment of the present application; Figure 3Schematic diagram of drag and lifting force caused by ellipsoidal particles flowing through a uniform flow field in a method for conveying ballast during shield machine excavation according to one embodiment of the present application; Figure 4 Schematic diagram of an ellipsoidal starting mode in a pipe water flow in a method for conveying ballast during tunneling of a shield machine according to an embodiment of the present application; Figure 5 Schematic diagram of the force support of top-layer particles in an ellipsoidal accumulation state in a method for conveying ballast during shield machine excavation according to one embodiment of the present application; Figure 6 Schematic diagram of the force sliding mode of top-layer particles in an ellipsoidal accumulation state in a method for conveying ballast during shield machine excavation according to one embodiment of the present application; Figure 7 Schematic diagram of a force rolling mode of top-layer particles in an ellipsoidal accumulation state in a method for conveying ballast during shield machine excavation according to an embodiment of the present application; Figure 8 This is a block diagram of an electronic device used to implement the method for conveying slag during the tunneling process of a shield machine according to an embodiment of the present application. DETAILED DESCRIPTION

[0018] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present application. Therefore, the drawings and description are to be regarded as illustrative in nature and not restrictive.

[0019] Figure 1 FIG. 1 is a flow chart showing a method for conveying ballast during shield machine excavation according to an embodiment of the present application. Figure 1-Figure 7 As shown, a method for conveying ballast during shield machine excavation may include: S110: Acquire physical parameters in the pipeline, wherein the physical parameters include water parameters, particle parameters, and parameters between particles; S120: inputting the physical property parameters of the pipeline into the designated model and drawing the designated ellipsoid based on the Fibonacci spiral method to generate an ellipsoid model; S130: Sampling three support points of the ellipsoid model to obtain coordinates of the three support points; S140: Calculating the coordinates of the three support points to obtain a stacking angle formed by the three support points; S150: When the stacking angle formed by the three support points satisfies a specified constraint condition, obtaining a sliding critical starting flow rate condition, a rolling critical starting flow rate condition, and a safe starting flow rate condition according to the coordinates of the three support points; S160: Controlling the flow rate of the ballast transported by the pipeline according to the sliding critical starting flow rate condition, the rolling critical starting flow rate condition, and the safety starting flow rate condition.

[0020] The ballast conveying method during shield machine excavation in this embodiment can be implemented by providing hardware support through a host device. The calculation and prediction process for the sliding critical starting flow rate condition, the rolling critical starting flow rate condition, and the safe starting flow rate condition can be directly calculated and implemented by the host device.

[0021] In this embodiment, the method for conveying slag during the excavation process of the shield machine includes: obtaining physical parameters in the pipeline, wherein the physical parameters include water parameters, particle parameters and parameters between particles; according to the physical parameters of the pipeline, the specified ellipsoid is drawn based on the Fibonacci spiral method to generate an ellipsoid model; three support points are sampled on the ellipsoid model to obtain the coordinates of the three support points; the coordinates of the three support points are calculated to obtain the stacking angle formed by the three support points; when the stacking angle formed by the three support points meets the specified constraint conditions, the sliding critical starting flow rate condition, the rolling critical starting flow rate condition and the safety starting flow rate condition are obtained according to the coordinates of the three support points; according to the sliding critical starting flow rate condition, the rolling critical starting flow rate condition and the safety starting flow rate condition, the flow rate of the slag conveyed by the pipeline is controlled. This effectively solves the problem of how to discharge these huge amounts of debris smoothly and efficiently out of the tunnel, and realizes the prediction of the critical starting flow rate of slag under different morphologies, different postures and different support point distributions, so that during tunnel excavation construction, as the tunnel excavation diameter continues to increase, the number of debris and rock blocks generated by the cutting action of the tunnel boring machine cutter head and tools increases sharply. By obtaining the sliding critical starting flow rate condition, the rolling critical starting flow rate condition and the safe starting flow rate condition, the flow rate of the slag transported in the pipeline is adjusted by controlling the slurry pump, which can effectively improve the excavation efficiency of the tunnel boring machine while ensuring construction safety, avoid the problem of excessive pressure in the slurry pump, and greatly reduce construction costs.

[0022] In step S110 , physical parameters in the pipeline are acquired, wherein the physical parameters include water parameters, particle parameters, and parameters between particles.

[0023] In this embodiment, the physical parameters in the pipeline include physical parameters such as particle size parameters (a, b, c), posture characteristic angle, inter-particle friction coefficient, particle density and water density, among which the water body parameters can be water density, etc., the particle parameters can be particle size parameters (a, b, c), posture characteristic angle and particle density, etc., and the parameters between particles can be inter-particle friction coefficient, etc.

[0024] In step S120 , the physical parameters of the pipeline are input into a designated model, and a designated ellipsoid is drawn based on the Fibonacci spiral method to generate an ellipsoid model.

[0025] In this embodiment, the particles can be ellipsoidal pebbles. A pebble force model is established in three-dimensional space, and a theoretical analysis of the flow phenomenon of stacked pebbles is performed. The ellipsoid model fully considers the arbitrary posture of the ellipsoid in three-dimensional space, analyzes the critical force characteristics under different starting conditions, and establishes a flow velocity formula. In this flow velocity formula, the flow velocity in the flow field within the pipeline is uniformly distributed in space, that is, the flow velocity is equal at all positions. This means that at any point in the flow field, the magnitude and direction of the flow velocity are the same. Moreover, the streamlines in the flow field will not be affected by obstacles (such as pebbles). This means that the streamlines will not bend or deform when encountering obstacles, and the fluid will continue to flow along the original path.

[0026] According to the definition of Euler angle, Figure 2 As shown, the global coordinate system XYZ is established with the direction of water flow in the pipe as the positive direction of the Y axis, and in the initial posture, the default ellipsoid major axis a coincides with the global coordinate system X axis, b coincides with the Y axis, and c coincides with the Z axis in the initial posture. The ellipsoid rotates along the Z axis in the global coordinate system. (Yaw angle, controls the direction of the ellipsoid's major axis a in the transverse plane, such as left / right), and then rotates along its own b-axis (Pitch angle, controls the tilt of the ellipsoid's minor axis c, such as tilting up or sinking down), and then rotates along its own c-axis (The roll angle controls the rotation state of the ellipsoid around its own short axis c, such as the twisting of particles around the streamline direction). The transformation of these four characteristic postures is used to describe the posture of the ellipsoid at any angle in the pipeline space.

[0027] Specifically, they can be: Global Coordinate System: X-axis: perpendicular to the pipeline axis (horizontal) Y-axis: along the direction of water flow in the pipe (longitudinal direction, positive direction is the direction of water flow) Z axis: vertically upward (normal) Ellipsoid local coordinate system: Initial pose: The ellipsoid semi-axes a, b, and c coincide with the global coordinate system X, Y, and Z axes respectively.

[0028] In the initial posture, the major axis a of the ellipsoid is horizontally extended, the central axis b is along the direction of water flow, and the minor axis c is vertically upward.

[0029] The standard three-dimensional ellipsoid equation in the spatial coordinate system is: Where a, b, and c are the lengths of the characteristic axes of the ellipsoid, respectively. It can be seen that the standard ellipsoid characteristic matrix equation with the ellipsoid characteristic axis a as the x-axis direction of the coordinate system is as follows: Then press the above navigation angle in the space - Pitch angle - Rotation angle The characteristic rotation matrices of the sequential rotations are: The feature matrix used to describe the ellipsoid space posture can be expressed as: The characteristic equation of the ellipsoid after arbitrary rotation of the standard ellipsoid is: Then the ellipsoid coordinate transformation in the global coordinate system before and after rotation (initial state - final state) is as follows: Then the ellipsoid equation at any position after the standard ellipsoid undergoes Euler rotation is: Where: is the element in row 1 and column 4, is the element in row 4 and column 1, both of which are 0; is the element in row 2 and column 4, is the element in row 4 and column 2, both of which are 0; is the element in row 3 and column 4, is the element in row 4 and column 3, both of which are 0; It is the element in the 4th row and 4th column, and its value is -1.

[0030] The above formula can describe an ellipsoid with any posture in three-dimensional space, and can also mathematically express the position of each point on the ellipsoid with any posture.

[0031] For the ellipsoid particle group under the overall static accumulation, the ellipsoid particle at the top satisfies the static force balance, and in the flow field, the microelement area of ​​the ellipsoid surface , the fluid force can be decomposed into pressure drag force Tangential friction drag The component of the combined force of the two along the direction of water flow is the drag force , the component perpendicular to the direction of water flow is the lifting force , that is, the static particles are mainly affected by the drag force exerted by the liquid , lifting force and the underwater gravity under the action of its own volume, such as Figure 3 As shown in the figure, the drag force and lifting force in the water flow are mainly related to the area of ​​the water flow and the particle. Pressure drag force Tangential friction drag , is the angle between the pressure drag force and the direction of water flow, where the resultant force in the direction of water flow acts as the drag force, and the resultant force in the vertical direction acts as the lifting force, so the drag force and lifting force It can be expressed as: Where, Tangential friction drag, is the normal pressure on the ellipsoid surface, is the angle between the normal pressure and the flow direction, The surface area of ​​the ellipsoid is and are the drag coefficient and lift coefficient, which are mostly obtained from indoor experiments. is the total area of ​​the ellipsoidal surface affected by the water flow (i.e. the projected area of ​​the water flow), and the range of the area is: In addition, the underwater gravity of the ellipsoid is expressed as the difference between its gravity and buoyancy: Where, is the solid phase density, is the equivalent diameter.

[0032] Using the parameters of the ellipsoid generated in the above embodiment, the Fibonacci spiral method was used to uniformly generate N points on the ellipsoid's surface. The Fibonacci spiral algorithm was then used to generate a uniformly distributed point set {(xi, yi, zi)} on the unit sphere (radius r = 1). The unit sphere points were then stretched to the target size along the ellipsoid's semi-axis to generate the ellipsoid's surface point set {(xi, yi, zi)}. The generated ellipsoid points were then rotated three-dimensionally according to the actual attitude parameters to simulate the spatial orientation of the particles in the pipeline, generating an ellipsoid model with the actual spatial attitude.

[0033] In step S130, three support points are sampled on the ellipsoid model to obtain the coordinates of the three support points.

[0034] In this embodiment, under the action of water flow in the pipeline, the static ellipsoid particle accumulation group begins to move along the flow direction of the pipeline. Since the lower ellipsoid particles are subjected to more complex forces than the top particles under the action of the inter-particle squeezing force, it is believed that the top particles start to move first than the bottom particles during the ellipsoid flow process. Under different conditions of water flow velocity and ellipsoid posture, such as Figure 4 As shown in the figure, the ellipsoid start modes in pipeline flow are mainly divided into three modes: rolling start, sliding start and jumping start. However, it is difficult for ballast in actual horizontal pipeline structure to jump start, and most of the jumping phenomena will occur after entering the transportation stage. Therefore, sliding start and rolling start modes are considered.

[0035] For the ballast particle group under overall static accumulation, the ballast particles at the top of the surface layer need to meet the static force balance. Considering that the top ballast particles must meet the requirements of at least three supporting bodies at the bottom, such as Figure 5 As shown, there are at least three support points P1, P2, and P3 at the bottom of the ellipsoid, and particles in the same posture can have multiple groups of support point combinations, which simplifies the starting problem of particles on the surface of the accumulated ballast into the starting problem of a single particle under different support point conditions.

[0036] To analyze the initiation of water flow in an ellipsoid model, the first step is to determine the ellipsoid's support points. For a statically stacked group of ballast particles, the topmost ballast particles must have at least three support points to maintain static force equilibrium. These support points form a theoretical sliding support surface, which is used to analyze the ellipsoid's sliding initiation conditions.

[0037] To analyze the initiation of water flow in an ellipsoid model, the first step is to determine the ellipsoid's support points. For a statically stacked group of ballast particles, the topmost ballast particles must have at least three support points to maintain static force equilibrium. These support points form a theoretical sliding support surface, which is used to analyze the ellipsoid's sliding initiation conditions.

[0038] According to the geometric shape and stacking of the ellipsoid, the three support points P1, P2, and P3 at the bottom of the ellipsoid are determined. The coordinates of these support points are , , .

[0039] These support points can be extracted from the bottom surface of the ellipsoid through geometric analysis or numerical simulation. When sampling, it is necessary to ensure that these points can reasonably support the ellipsoid and meet the static force equilibrium conditions.

[0040] For the sliding start of the ellipsoid in the water flow, the three supporting points satisfy the force balance of the top ellipsoid in the static state. , , Constitute the theoretical sliding support surface.

[0041] In step S140, the coordinates of the three support points are calculated to obtain a stacking angle formed by the three support points.

[0042] After determining the coordinates of the three support points, we need to calculate the stacking angle formed by these support points. The stacking angle is the angle between the support plane and the xoy plane of the global coordinate system and is used to analyze the sliding initiation conditions of the ellipsoid.

[0043] Calculate the support plane: Calculate the normal vector of the support plane based on the coordinates of the three support points. Assume that the coordinates of the three support points are , , , the normal vector can be calculated by the vector cross product : in, , .

[0044] Calculating the stacking angle: Normal vector to the supporting plane The angle with the z-axis is the stacking angle (That is, the angle formed by the support plane and the global coordinate system xoy plane is the support angle ). It can be calculated by the following formula: in, is the component of the normal vector n on the z-axis, is the modulus of the normal vector.

[0045] In step S150, when the stacking angle formed by the three support points satisfies the specified constraint conditions, the sliding critical starting flow rate condition, the rolling critical starting flow rate condition and the safe starting flow rate condition are obtained according to the coordinates of the three support points.

[0046] In this embodiment, the ellipsoid slides along the support plane, and the mechanical condition that the sum of the components of the ellipsoid's forces on the plane is greater than the friction between the ellipsoid particles is satisfied. The critical force condition for the ellipsoid to start sliding in the water flow is: Therefore, the water velocity condition that satisfies the ellipsoid sliding starting condition is: in, is the critical starting velocity, g is the acceleration of gravity; that is, at the water flow velocity When the above conditions are met, the particles in the pipe can slide.

[0047] For the rolling start of the ellipsoid in the water flow, in order to make the particles meet the rolling start in the water, it is defined that the ellipsoid moves around the three supporting points close to the water flow direction under the action of the water flow. , The midpoint is rolled. Different from the sliding start mode, in the rolling start mode, the critical torque balance of the ellipsoid rolling around the theoretical fulcrum must be satisfied. Defined as the rolling fulcrum, the force arm of gravity and lift is L L , the drag force arm is L D , we can get: in, is the drag force direction angle, which is expressed as: Therefore, the water velocity condition that satisfies the ellipsoid rolling starting condition is: That is to say, the water flow rate When the above conditions are met, the particles in the pipe can roll.

[0048] In addition, in order to ensure the stable transportation of pebbles in the pipeline, the safe starting flow rate is usually the larger value of the sliding critical starting flow rate condition and the rolling critical starting flow rate condition. : Through the above steps, the starting situation of the ellipsoid under the action of pipeline water flow can be comprehensively analyzed, and the sliding critical starting flow rate conditions, rolling critical starting flow rate conditions and safe starting flow rate conditions can be determined.

[0049] In step S160, the flow rate of the ballast transported by the pipeline is controlled according to the sliding critical starting flow rate condition, the rolling critical starting flow rate condition and the safety starting flow rate condition.

[0050] In this embodiment, the sliding critical starting flow rate condition, the rolling critical starting flow rate condition and the safe starting flow rate condition can be obtained through the above. The flow rate of the slurry pump is controlled by the sliding critical starting flow rate condition, the rolling critical starting flow rate condition and the safe starting flow rate condition, thereby effectively improving the excavation efficiency of the tunnel boring machine while ensuring construction safety, avoiding the problem of excessive pressure in the slurry pump, and greatly reducing construction costs.

[0051] In one embodiment, sampling three support points of the ellipsoid model to obtain sampling conditions in the coordinates of the three support points includes: The three support points are all in the lower half of the ellipsoid model, the projections of the three support points on the specified surface will not be on the same straight line, the origin of the elliptical model coordinate system is located in the triangle formed by the three support points, and the distance between any two support points is greater than the specified distance.

[0052] In this embodiment, the conditions for sampling three support points in the ellipsoid model include: Support point locations: The three support points are located in the lower half of the ellipsoid model to ensure that the ellipsoid can be stably placed on the bottom of the pipe when supported at these points.

[0053] Projections are not collinear: The projections of the three support points on the specified surface will not lie on the same straight line, preventing the ellipsoid from tilting or rolling and ensuring the stability of the support.

[0054] The origin is inside the triangle: The origin of the ellipse model coordinate system is located inside the triangle formed by the three support points, ensuring that the center of mass of the ellipsoid is above these support points for more stable support.

[0055] Distance between points: The distance between any two support points should be greater than the specified distance to avoid stress concentration or unrealistic contact points and maintain a reasonable distribution of support points.

[0056] Sampling process Define an ellipsoidal coordinate system: Establish a coordinate system where the center of the ellipsoid is at the origin (0,0,0) and the major and minor axes are aligned with the coordinate axes.

[0057] Determine bottom half: Determines the "bottom half" of the ellipsoid based on the orientation of the major axis. Assuming the major axis is vertical, the bottom half will be the part in the negative z-axis direction.

[0058] Select the first point: Randomly select a point in the lower half ,in .

[0059] Select second point: Select another point ,make sure: Its projection and Not collinear.

[0060] and The distance between them is greater than the minimum distance.

[0061] Select the third point: Select ,make sure: Its projection Not with and Collinear.

[0062] The origin (0,0) is located at , , inside the triangle formed.

[0063] and The distance between and The distance between them is greater than d min .

[0064] Check if the origin is inside the triangle: Use barycentric coordinates to check if the origin is inside the triangle. If the origin can be expressed as a weighted average of the triangle's vertices, and all weights are positive and sum to 1, then the origin is inside the triangle.

[0065] Distance check: Calculate the pairwise Euclidean distances and ensure they are all greater than d min .

[0066] Once all three points meet these conditions, the sampling process is considered successful. The coordinates of these points are used for further analysis, such as calculating the repose angle and starting flow rate.

[0067] The three support points that are successfully sampled meet all specified conditions, ensuring that they lie in the lower half of the ellipsoid, their projections are not collinear, the origin lies within the triangle they form, and the points are appropriately spaced.

[0068] In one embodiment, when the stacking angle formed by the three support points satisfies a specified constraint condition, obtaining the sliding critical starting flow rate condition and the rolling critical starting flow rate condition based on the coordinates of the three support points includes: When the stacking angle formed by the three support points must be less than or equal to the repose angle, the sliding critical starting flow rate conditions and the rolling critical starting flow rate conditions are obtained based on the coordinates of the three support points. The repose angle is the maximum angle between the stable inclined plane formed when the particles are accumulated and the horizontal plane.

[0069] In this embodiment, when the stacking angle formed by the three support points meets the specified constraint conditions, that is, the stacking angle is less than or equal to the repose angle, the sliding critical starting flow rate conditions and the rolling critical starting flow rate conditions can be calculated based on the coordinates of the three support points.

[0070] The angle of repose is the angle between the plane formed by the three support points and the horizontal plane. The angle of repose is the maximum angle between the stable slope formed by the particles when they are stacked and the horizontal plane. When the angle of repose is less than or equal to the angle of repose, the particles are stable and will not slide or roll.

[0071] In this embodiment, the specified constraint is that the stacking angle formed by the three support points is less than or equal to the angle of repose. In other words, only when the stacking angle is within this range will the particles be relatively stable yet easy to start. In this case, calculating the critical sliding and rolling starting flow rates based on the coordinates of the three support points is meaningful.

[0072] Sliding critical starting flow rate condition When the angle of repose is less than or equal to the angle of repose, the ellipsoidal particles may slide under the action of water flow. The critical starting velocity condition for sliding refers to the velocity condition when the ellipsoidal particles just begin to slide under the action of water flow. The specific calculation method is as follows: Mechanical conditions: The ellipsoidal particles are in a static state and the force balance must satisfy the requirement that the sum of the forces acting on the supporting plane is greater than the friction between the ellipsoidal particles. The specific conditions are: in, is the force exerted by the water flow on the ellipsoid, is the friction between ellipsoidal particles, and β is the stacking angle.

[0073] Flow rate conditions: According to the above mechanical conditions, the critical starting flow rate of sliding can be derived : When the angle of repose is less than or equal to the angle of repose, the forces acting on the particle can be determined based on the coordinates of the three support points. In this case, for the particle to initiate sliding, the component of the force exerted by the water flow on the support plane must overcome the friction between the particles. By analyzing the force balance on the particle, a formula for calculating the critical sliding initiation velocity can be derived. This formula typically involves information such as the physical parameters of the particle (such as particle density and friction coefficient), the physical parameters of the water flow (such as water density and viscosity), and the coordinates of the support points.

[0074] Rolling critical starting flow rate conditions When the angle of repose is less than or equal to the angle of repose, ellipsoidal particles may also roll under the action of water flow. The critical starting velocity condition for rolling refers to the velocity condition when the ellipsoidal particles just start to roll under the action of water flow. The specific calculation method is as follows: Mechanical conditions: When an ellipsoidal particle rolls around the midpoint of the three support points close to the direction of the water flow under the action of water flow, it must meet the critical rotational torque balance under the theoretical support point of the ellipsoidal rolling. The specific conditions are: in, is the rolling moment, is the force exerted by the water flow on the ellipsoid, is the moment arm of the drag force, It's gravity. is the moment arm of gravity.

[0075] Flow rate conditions: Based on the above mechanical conditions, the rolling critical starting flow rate can be derived : Similarly, if the angle of repose is less than or equal to the angle of repose, for particles to initiate rolling motion, the force exerted by the water flow on the particles must generate sufficient torque to cause the particles to rotate about a support point or line. By analyzing the moment balance of the particles, we can derive a formula for calculating the critical rolling velocity. This formula also incorporates relevant physical parameters of the particle and water flow, as well as the coordinates of the support point. Safe start flow rate In actual engineering, in order to ensure the stable transportation of pebbles in the pipeline, the larger value of the sliding critical starting flow rate and the rolling critical starting flow rate is usually taken as the safe starting flow rate. : Through the above steps, when the stacking angle is less than or equal to the repose angle, the sliding critical starting flow rate and the rolling critical starting flow rate can be calculated according to the coordinates of the three support points, thereby determining the safe starting flow rate and ensuring the stable transportation of pebbles in the pipeline.

[0076] In one embodiment, the coordinates of the three support points are obtained in multiple groups, and obtaining the sliding critical starting flow rate condition, the rolling critical starting flow rate condition, and the safe starting flow rate condition according to the coordinates of the three support points includes: According to the coordinates of the three support points, a plurality of sets of sliding starting flow velocities and a plurality of sets of rolling starting flow velocities are obtained; Selecting a plurality of selected support points from the plurality of sliding start flow rates and the plurality of rolling start flow rates, wherein the speeds of the selected support points are all less than or equal to a specified flow rate, wherein the specified flow rate is a sliding critical start flow rate condition and a rolling critical start flow rate condition; The maximum value of the sliding starting flow rates or the rolling starting flow rates in the plurality of groups of support points is determined as a safe starting flow rate condition.

[0077] In this embodiment, in one implementation, the coordinates of the three support points are obtained in multiple groups (e.g., 50 groups). The steps for obtaining the sliding critical starting flow rate condition, the rolling critical starting flow rate condition, and the safe starting flow rate condition based on the coordinates of the three support points are as follows: 1. Calculate multiple sets of sliding start flow rates and rolling start flow rates According to the coordinates of the 50 groups of three support points, the sliding starting flow rate and the rolling starting flow rate corresponding to each group of support points are calculated respectively, so as to obtain 50 groups of sliding starting flow rates and 50 groups of rolling starting flow rates.

[0078] 2. Select support points that meet the specified flow rate conditions A plurality of selected support points are selected from the 50 sets of sliding start flow rates and the 50 sets of rolling start flow rates, each of which has a speed less than or equal to a specified flow speed. The specified flow speed is a sliding critical start flow speed condition and a rolling critical start flow speed condition.

[0079] 3. Determine safe starting flow rate conditions The maximum value of the sliding starting flow rates or the rolling starting flow rates in the plurality of groups of support points is determined as a safe starting flow rate condition.

[0080] Specific steps Calculate the sliding start flow rate and the rolling start flow rate: for each set of three support point coordinates, calculate the sliding start flow rate and the rolling start flow rate corresponding to the set of support points according to the corresponding calculation formula or method.

[0081] Filter the support points that meet the conditions: Compare the calculated 50 groups of sliding start flow rates and 50 groups of rolling start flow rates with the specified sliding critical start flow rate conditions and rolling critical start flow rate conditions, and filter out the support point groups whose sliding start flow rates and rolling start flow rates are both less than or equal to the specified flow rates.

[0082] Determine the safe starting flow rate: among the multiple groups of support points screened, find the maximum value of the sliding starting flow rate or the rolling starting flow rate, and determine the maximum value as the safe starting flow rate condition.

[0083] Through the above steps, the conditions of multiple groups of support points can be comprehensively considered to determine the flow rate conditions that meet the safety starting requirements, providing a more reliable reference basis for actual engineering applications.

[0084] The sliding and rolling starting flow rates were calculated based on 50 groups of support point coordinates, and the groups that met the conditions were screened out, and the maximum value was taken as the safe starting flow rate condition.

[0085] In a second aspect, an embodiment of the present application provides a ballast conveying system, comprising: An acquisition module is used to acquire physical parameters in the pipeline, wherein the physical parameters include water parameters, particle parameters, and parameters between particles; A generating module, configured to draw a designated ellipsoid based on the Fibonacci spiral method according to the physical property parameters of the pipeline input into a designated model, thereby generating an ellipsoid model; A first obtaining module is used to sample three support points of the ellipsoid model to obtain the coordinates of the three support points; A second obtaining module is used to calculate the coordinates of the three support points to obtain the stacking angle formed by the three support points; a third obtaining module, configured to obtain, based on the coordinates of the three support points, a sliding critical starting flow rate condition, a rolling critical starting flow rate condition, and a safe starting flow rate condition when the stacking angle formed by the three support points satisfies a specified constraint condition; The control module is used to control the flow rate of the ballast transported by the pipeline according to the sliding critical starting flow rate condition, the rolling critical starting flow rate condition and the safety starting flow rate condition.

[0086] In this embodiment, in the stone slag conveying system, the physical parameters in the pipeline are obtained, and the physical parameters include water parameters, particle parameters and parameters between particles; the physical parameters of the pipeline are input into a specified model, and a specified ellipsoid is drawn based on the Fibonacci spiral method to generate an ellipsoid model; three support points of the ellipsoid model are sampled to obtain the coordinates of the three support points; the coordinates of the three support points are calculated to obtain the stacking angle formed by the three support points; when the stacking angle formed by the three support points meets the specified constraint conditions, the sliding critical starting flow rate condition, the rolling critical starting flow rate condition and the safety starting flow rate condition are obtained according to the coordinates of the three support points; according to the sliding critical starting flow rate condition, the rolling critical starting flow rate condition and the safety starting flow rate condition, the flow rate of the stone slag conveyed by the pipeline is controlled. This effectively solves the problem of how to discharge these huge amounts of debris smoothly and efficiently out of the tunnel, and realizes the prediction of the critical starting flow rate of slag under different morphologies, different postures and different support point distributions, so that during tunnel excavation construction, as the tunnel excavation diameter continues to increase, the number of debris and rock blocks generated by the cutting action of the tunnel boring machine cutter head tool increases sharply. By obtaining the sliding critical starting flow rate condition, the rolling critical starting flow rate condition and the safe starting flow rate condition, the flow rate of the slag transported in the pipeline is adjusted by controlling the slurry pump, which can effectively improve the excavation efficiency of the tunnel boring machine while ensuring construction safety, avoid the problem of excessive pressure in the slurry pump, and greatly reduce construction costs.

[0087] In one embodiment, sampling three support points of the ellipsoid model to obtain sampling conditions in the coordinates of the three support points includes: The three support points are all in the lower half of the ellipsoid model, the projections of the three support points on the specified surface will not be on the same straight line, the origin of the elliptical model coordinate system is located in the triangle formed by the three support points, and the distance between any two support points is greater than the specified distance.

[0088] In one embodiment, when the stacking angle formed by the three support points satisfies a specified constraint condition, obtaining the sliding critical starting flow rate condition and the rolling critical starting flow rate condition based on the coordinates of the three support points includes: When the stacking angle formed by the three support points is less than or equal to the repose angle, the sliding critical starting flow rate condition and the rolling critical starting flow rate condition are obtained based on the coordinates of the three support points. The repose angle is the maximum angle between the stable inclined plane formed when the particles are accumulated and the horizontal plane.

[0089] In one embodiment, the coordinates of the three support points are obtained in multiple groups, and obtaining the sliding critical starting flow rate condition, the rolling critical starting flow rate condition, and the safe starting flow rate condition according to the coordinates of the three support points includes: According to the coordinates of the three support points, a plurality of sets of sliding starting flow velocities and a plurality of sets of rolling starting flow velocities are obtained; Selecting a plurality of selected support points from the plurality of sliding start flow rates and the plurality of rolling start flow rates, wherein the speeds of the selected support points are all less than or equal to a specified flow rate, wherein the specified flow rate is a sliding critical start flow rate condition and a rolling critical start flow rate condition; The maximum value of the sliding starting flow rates or the rolling starting flow rates in the plurality of groups of support points is determined as a safe starting flow rate condition.

[0090] The functions of each module in each device in the embodiments of the present application can be found in the corresponding description in the above method and will not be repeated here.

[0091] Figure 8 FIG. 1 shows a structural block diagram of an electronic device according to an embodiment of the present application. Figure 8 As shown, the electronic device includes: a memory 410 and a processor 420, and the memory 410 stores instructions that can be executed on the processor 420. When the processor 420 executes the instructions, the method for conveying ballast during the tunneling process of the shield machine in the above-mentioned embodiment is implemented. The number of the memory 410 and the processor 420 can be one or more. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital assistants, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present application described and / or required herein.

[0092] The electronic device may also include a communication interface 430 for communicating with external devices and performing data exchange transmission. The various devices are connected to each other using different buses and can be installed on a common motherboard or in other ways as needed. The processor 420 can process instructions executed in the electronic device, including instructions stored in or on the memory to display graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In other embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple electronic devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 8 Only one thick line is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0093] Optionally, in a specific implementation, if the memory 410, the processor 420 and the communication interface 430 are integrated on a chip, the memory 410, the processor 420 and the communication interface 430 can communicate with each other through an internal interface.

[0094] It should be understood that the processor described above may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor. It is worth noting that the processor may be a processor that supports the Advanced RISC Machines (ARM) architecture.

[0095] An embodiment of the present application provides a computer-readable storage medium (such as the memory 410 described above), which stores computer instructions. When the program is executed by a processor, the method provided in the embodiment of the present application is implemented.

[0096] Optionally, the memory 410 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and applications required for at least one function; the data storage area may store data created based on the use of the electronic device, etc. In addition, the memory 410 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some embodiments, the memory 410 may optionally include a memory remotely located relative to the processor 420, and these remote memories may be connected to the electronic device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0097] In the description of this specification, the reference terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials, or characteristics described may be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification, as well as features of different embodiments or examples, unless they are mutually inconsistent.

[0098] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0099] Any process or method description in a flowchart or otherwise described herein can be understood to represent a module, segment, or portion of code comprising one or more (two or more) executable instructions for implementing the steps of a specific logical function or process. Furthermore, the scope of the preferred embodiments of the present application includes alternative implementations in which the functions may be performed in a different order than shown or discussed, including in a substantially simultaneous manner or in a reverse order depending on the functions involved.

[0100] The logic and / or steps represented in the flowchart or otherwise described herein may be considered, for example, as a sequenced list of executable instructions for implementing the logical functions, and may be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device).

[0101] It should be understood that various parts of the present application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. All or part of the steps of the above embodiment method can be completed by instructing the relevant hardware through a program, which can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0102] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing module, or each unit may exist physically separately, or two or more units may be integrated into a single module. The aforementioned integrated modules may be implemented in the form of hardware or in the form of software functional modules. If the aforementioned integrated modules are implemented in the form of software functional modules and sold or used as independent products, they may also be stored in a computer-readable storage medium. The storage medium may be a read-only memory, a magnetic disk, or an optical disk, etc.

[0103] The above are only specific embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of various modifications or substitutions within the technical scope disclosed in this application, and such modifications or substitutions should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A method for conveying ballast in a shield machine excavation process, characterized in that: include: Acquiring physical parameters in the pipeline, wherein the physical parameters include water parameters, particle parameters, and parameters between particles; Inputting the physical property parameters of the pipeline into the designated model, drawing the designated ellipsoid based on the Fibonacci spiral method, and generating an ellipsoid model; Sampling three support points of the ellipsoid model to obtain coordinates of the three support points; Calculating the coordinates of the three support points to obtain a stacking angle formed by the three support points; When the stacking angle formed by the three support points satisfies the specified constraint conditions, a sliding critical starting flow rate condition, a rolling critical starting flow rate condition and a safe starting flow rate condition are obtained according to the coordinates of the three support points; The flow rate of the ballast transported by the pipeline is controlled according to the sliding critical starting flow rate condition, the rolling critical starting flow rate condition and the safe starting flow rate condition.

2. The method according to claim 1, characterized in that The sampling conditions for sampling three support points of the ellipsoid model to obtain the coordinates of the three support points include: The three support points are all in the lower half of the ellipsoid model, the projections of the three support points on the specified surface will not be located on the same straight line, the origin of the elliptical model coordinate system is located in the triangle formed by the three support points, and the distance between any two support points is greater than the specified distance.

3. The method according to claim 1, characterized in that When the stacking angle formed by the three support points satisfies the specified constraint conditions, the sliding critical starting flow rate condition and the rolling critical starting flow rate condition are obtained according to the coordinates of the three support points, including: When the stacking angle formed by the three support points is less than or equal to the repose angle, the critical starting flow rate conditions for sliding and rolling are obtained based on the coordinates of the three support points. The repose angle is the maximum angle between the stable inclined plane formed when the particles are accumulated and the horizontal plane.

4. The method according to claim 1, characterized in that: The coordinates of the three support points are obtained in multiple groups. According to the coordinates of the three support points, the sliding critical starting flow rate condition, the rolling critical starting flow rate condition and the safe starting flow rate condition are obtained, including: According to the coordinates of the three support points, a plurality of sets of sliding start flow velocities and a plurality of sets of rolling start flow velocities are obtained; Selecting multiple groups of selected support points whose speeds are all less than or equal to a specified speed from among the multiple groups of sliding starting flow rates and the multiple groups of rolling starting flow rates, wherein the specified flow rate is a sliding critical starting flow rate condition and a rolling critical starting flow rate condition; The maximum value of the sliding starting flow rates or the rolling starting flow rates in the plurality of groups of supporting points is determined as the safe starting flow rate condition.

5. A ballast conveying system, characterized in that: include: An acquisition module, used to acquire physical property parameters in the pipeline, wherein the physical property parameters include water parameters, particle parameters and parameters between particles; A generating module, used for drawing a designated ellipsoid based on the Fibonacci spiral method according to the physical property parameters of the pipeline input into the designated model, so as to generate an ellipsoid model; The first obtaining module is used to sample three supporting points of the ellipsoid model to obtain the coordinates of the three supporting points; A second obtaining module is used to calculate the coordinates of the three supporting points to obtain the stacking angle formed by the three supporting points; A third obtaining module is used to obtain a sliding critical starting flow rate condition, a rolling critical starting flow rate condition and a safe starting flow rate condition according to the coordinates of the three supporting points when the stacking angle formed by the three supporting points satisfies the specified constraint condition; The control module is used to control the flow rate of the ballast transported by the pipeline according to the sliding critical starting flow rate condition, the rolling critical starting flow rate condition and the safety starting flow rate condition.

6. The ballast conveying system according to claim 5, characterized in that: The sampling conditions for sampling three support points of the ellipsoid model to obtain the coordinates of the three support points include: The three support points are all in the lower half of the ellipsoid model, the projections of the three support points on the specified surface will not be located on the same straight line, the origin of the elliptical model coordinate system is located in the triangle formed by the three support points, and the distance between any two support points is greater than the specified distance.

7. The ballast conveying system according to claim 5, characterized in that: When the stacking angle formed by the three support points satisfies the specified constraint conditions, the sliding critical starting flow rate condition and the rolling critical starting flow rate condition are obtained according to the coordinates of the three support points, including: When the stacking angle formed by the three support points must be less than or equal to the repose angle, the critical starting flow rate conditions for sliding and rolling are obtained based on the coordinates of the three support points. The repose angle is the maximum angle between the stable inclined plane formed when the particles are accumulated and the horizontal plane.

8. The ballast conveying system according to claim 5, characterized in that: The coordinates of the three support points are obtained in multiple groups. According to the coordinates of the three support points, the sliding critical starting flow rate condition, the rolling critical starting flow rate condition and the safe starting flow rate condition are obtained, including: According to the coordinates of the three support points, a plurality of sets of sliding start flow velocities and a plurality of sets of rolling start flow velocities are obtained; Selecting multiple groups of selected support points whose speeds are all less than or equal to a specified speed from among the multiple groups of sliding starting flow rates and the multiple groups of rolling starting flow rates, wherein the specified flow rate is a sliding critical starting flow rate condition and a rolling critical starting flow rate condition; The maximum value of the sliding starting flow rates or the rolling starting flow rates in the plurality of groups of supporting points is determined as the safe starting flow rate condition.

9. An electronic device, characterized in that: include: at least one processor; as well as a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method according to any one of claims 1 to 4.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and when the computer instructions are executed by a processor, the method according to any one of claims 1 to 4 is implemented.

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