Foundation pit stability discrimination method and system based on graph mutual driving mechanism and medium

Abstract

The present application relates to a kind of based on the stability discrimination method, system and medium of foundation pit of graph mutual driving mechanism, method includes: according to the suitable foundation pit support form of foundation pit design requirement, initialize various foundation pit design parameters, in parameter attribute value forward driving mode drawing foundation pit support structure sketch in CAD environment;According to the stability discrimination criterion of foundation pit, the actual working condition of project site is combined with manual tuning to design parameter, parameter adjustment result still uses with attribute driving graph mode immediate update support structure sketch, another can edit the graph element in support structure graph with graph driving attribute mode immediate feedback linkage update foundation pit support parameter;The stability of foundation pit support structure is calculated dynamically in real time throughout, when stability determination meets design requirement, with two three-dimensional interactive intuitive display foundation pit support design scheme, and output various design achievements.The present application can realize the graph attribute bidirectional mutual driving of foundation pit support design, it is convenient to quickly modify and perfect design scheme, improve foundation pit support design efficiency and quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of foundation pit stability discrimination, in particular to a foundation pit stability discrimination method and system based on a CAD-like environment and a graph-attribute mutual driving mechanism and a medium. BACKGROUND

[0002] With the rapid development of the construction industry in China, foundation pit engineering is gradually becoming large-scale and complex, which brings great difficulties to the calculation and discrimination of foundation pit stability. In order to express the foundation pit support design structure intuitively, commercial foundation pit design software generally needs to preinstall AutoCAD software, and then develop based on AutoCAD to realize the generation of foundation pit support structure graph based on one-way driving of design attributes. The software simulates the stress and deformation of the foundation pit support structure under different working conditions to carry out the stability calculation of the foundation pit. When the stability does not meet the requirements, the software can only update the foundation pit support structure graph by repeatedly modifying the design attribute data to adjust the support design scheme, and cannot update the foundation pit design attribute by editing the foundation pit support structure graph interactively, and then recalculate the stability of the foundation pit in real time. When the foundation pit support structure is complex, it is easy to extract incorrect attribute information and cause errors in the discrimination of foundation pit stability.

[0003] Chinese patent CN107315868A introduces a design method and system for the stability of foundation pit engineering based on Revit secondary development. The method builds a foundation pit model in Revit, automatically extracts effective information from the model to automatically calculate the stability of the foundation pit. Although it can quickly evaluate the stability by reading the model information, it still depends on the Revit working environment. Chinese patent CN117271591A introduces a method for realizing the bidirectional linkage between geological profile graph and survey data through a survey database. The method keeps the synchronization of survey attributes and profile graph through the database, and the rendering of the profile graph depends on the CAD environment and front-end graphic rendering analysis controls, which cannot automatically realize real-time graph-attribute mutual driving, affecting the efficiency and quality of survey results output. SUMMARY

[0004] The present application aims to provide a foundation pit stability discrimination method and system based on a CAD-like environment and a graph-attribute mutual driving mechanism, which can realize bidirectional mutual driving of foundation pit support design graph and attribute, facilitate quick modification and improvement of the design scheme, and improve the efficiency and quality of foundation pit support design.

[0005] To achieve the above-mentioned purpose, in a first aspect, the present application provides a foundation pit stability discrimination method based on a graph-attribute mutual driving mechanism, comprising the following specific steps:

[0006] S1: According to the design requirements of the foundation pit, determine the appropriate support form, initialize various foundation pit design parameters, and draw a foundation pit support structure sketch in a CAD-like environment in a parameter attribute value forward driving mode;

[0007] S2: According to the foundation pit stability criterion, the design parameters of the foundation pit are manually optimized in combination with the actual working conditions of the project site. The parameter adjustment results are updated in real time using the attribute-driven drawing method, and the design parameters are real-time checked by the built-in attribute checking mechanism;

[0008] S3: Through the built-in mathematical model of foundation pit stability calculation under different support forms, the design parameters of the foundation pit are automatically extracted from the foundation pit support structure sketch, and the stability of the foundation pit support structure corresponding to the sketch is real-time calculated;

[0009] S4: If the stability is qualified and the foundation pit design scheme is confirmed, go to the next step. If the stability is not qualified, the user can modify the graph elements in the support design sketch based on the CAD-like environment, realize the reverse attribute-driven drawing method to update the foundation pit support design parameters, and automatically real-time calculate the stability of the foundation pit, until the stability is qualified. The user can further optimize the foundation pit support design scheme based on the stability calculation results to achieve the purpose of cost saving;

[0010] S5: The foundation pit support design scheme is intuitively displayed in the CAD-like environment in a two-three-dimensional interactive manner, and various design results are output.

[0011] The CAD-like environment is a point, line, and surface graph element-based graphical drawing and editing human-computer interaction work environment. The environment is built-in with a graph attribute mutual driving mechanism including a unified mathematical model, data storage management, event-driven model, data synchronization update, and graphical drawing engine, to realize the consistency of graphs and attributes.

[0012] The unified data model refers to a general mathematical model for expressing foundation pit support elements in terms of graphs and attributes of point, line, and surface graph elements. The graph is a collection of various geometric elements contained in the graph element. The attribute includes geometric and non-geometric attributes of the graph element. The geometric attribute has coordinates, length, and direction. The non-geometric attribute has color, material, line type, layer, and design description.

[0013] The data storage management refers to storing the graphs and attributes in the unified data model in different tables of the spatial database, and associating the graphs and attributes with unique IDs to realize the binding and interaction of the graphs and attributes.

[0014] The event-driven model refers to event listening to all interactive operations of the user, and sending processing instructions to the data synchronization update and graphical drawing engine modules according to the event type and running logic.

[0015] The graph synchronization update refers to updating the unified mathematical model of the graph element in time when the graph or attribute data changes, and in the multi-user collaborative work scene, the graph synchronization update also establishes a data locking and version control mechanism, records the modification history of the data, and realizes data backtracking on demand;

[0016] The graph drawing engine refers to accurately drawing point, line, surface and other geometric information on the canvas according to the graph data in the unified data model, and outputting and displaying the graph element according to the specified drawing style.

[0017] The model of the foundation pit support stability calculation in the step S3 includes: slope excavation, soil nailing wall, cantilever / anchor / support, cement soil retaining wall and double-row pile support structure;

[0018] When the support form adopts slope excavation, the stability of the foundation pit is judged according to the following mathematical model; if the mathematical model is established, the stability of the slope excavation foundation pit model meets the design requirements, otherwise, the stability of the foundation pit model does not meet the design requirements;

[0019] ,

[0020] In the formula:

[0021] The foundation pit stability calculation coefficient; the safety level of the foundation pit support structure is one, two or three Should not be less than 1.30, 1.20 and 1.10 respectively;

[0022] , The cohesion (kPa) and internal friction angle (°) standard values of the bottom surface of the ith soil strip determined by the total stress method respectively;

[0023] The specific gravity (N / m 3 ) of the ith soil strip;

[0024] The height (m) of the ith soil strip;

[0025] The width (m) of the ith soil strip;

[0026] The additional load standard value (kPa) of the ith soil strip;

[0027] The angle (°) between the tangent line at the midpoint of the bottom of the ith soil strip and the horizontal line,Take the positive value when the negative value;

[0028] The total number of strips and the number of active side strips respectively;

[0029] When the support method adopts a cement-soil retaining wall support structure, the stability of the foundation pit is judged according to the following mathematical model. If the mathematical model is valid, the stability of the foundation pit model meets the design requirements; otherwise, the stability of the foundation pit model does not meet the design requirements.

[0030] ,

[0031] In the formula:

[0032] —The stability calculation coefficient for the foundation pit should not be less than 1.20;

[0033] —Self-weight of the vertical retaining wall outside the pit (kN / m);

[0034] —Self-weight of the concealed support (kN / m);

[0035] —Unit weight of the i-th soil layer (N / m³) 3 );

[0036] —Thickness (m) of the i-th soil layer;

[0037] —The passive earth pressure coefficient of the i-th soil layer;

[0038] —The active earth pressure coefficient of the i-th soil layer;

[0039] —The cohesion value (kPa) of the i-th soil layer;

[0040] C—Standard value of cohesion of the soil layer at the foundation of the wall (kPa);

[0041] —Width of wall base (m);

[0042] —Standard value of the internal friction angle of the soil layer at the base of the wall (°);

[0043] When the support method adopts a double-row pile support structure, the stability of the foundation pit is judged according to the following mathematical model. If the mathematical model is valid, the stability of the foundation pit model meets the design requirements; otherwise, the stability of the foundation pit model does not meet the design requirements.

[0044] ,

[0045] In the formula:

[0046] The safety level of the foundation pit support structure is Level I, Level II, or Level III. Should be respectively not less than 1.25, 1.20, 1.15;

[0047] The sum of the weight of double-row piles, pile top connecting beams and soil between piles (kN / m);

[0048] The standard value of cohesion of soil under the bottom surface of row piles (kPa);

[0049] The standard value of internal friction angle of soil under the bottom surface of row piles (°);

[0050] The center distance of double-row piles (m);

[0051] The diameter of front piles (m);

[0052] The diameter of rear piles (m);

[0053] The specific weight of the i-th layer of soil (N / m 3 );

[0054] The height of the i-th layer of soil (m);

[0055] The passive earth pressure coefficient of the i-th layer of soil;

[0056] The active earth pressure coefficient of the i-th layer of soil;

[0057] The standard value of cohesion of the i-th layer of soil (kPa);

[0058] In a second aspect, the present application provides a foundation pit stability discrimination system based on a graphic mutual driving mechanism, which is suitable for the above-mentioned method, and comprises a parameter management module, a graphic mutual driving CAD environment module, a two-dimensional and three-dimensional graphic display module, a stability discrimination module, an achievement output module and a statistical query module.

[0059] The parameter management module is used for dynamic storage, updating, checking and sharing of various parameters such as design parameters of foundation pit support forms, standard specification index parameters of foundation pits, support material specifications and types, and achievement output attributes;

[0060] The graphic mutual driving CAD environment module is used for bidirectional linkage updating of graphic and attribute information of foundation pit support elements in a CAD-like environment, so as to guarantee consistency of the graphic and attribute information;

[0061] The two-dimensional and three-dimensional graphic display module is used for stacking the two-dimensional foundation pit design drawing under the commercial electronic map scene of Baidu or the like, and realizing the linkage and interactive display of the two-dimensional and three-dimensional design drawings.

[0062] The stability discrimination module is used for dynamically calculating and discriminating the stability of the foundation pit based on the built-in stability discrimination mathematical model corresponding to various foundation pit support forms, and the actual foundation pit design parameters.

[0063] The achievement output module is used for outputting the drawings, calculation books and design manuals corresponding to the foundation pit design scheme under the condition of meeting the stability requirements of the foundation pit.

[0064] The statistical query module is used for querying the material category expense details and estimated workloads corresponding to the foundation pit design scheme.

[0065] In a third aspect, the present application provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program is executed by a processor to implement the steps of the foundation pit stability discrimination method based on the graphic attribute mutual driving mechanism.

[0066] The beneficial effects of the above embodiments are as follows:

[0067] 1) The CAD-like environment is independently developed, and the environment support of various CAD software is not needed, so that the dependence on commercial software is reduced, the drawing habit of the designer in drawing the foundation pit support structure drawing is retained, the learning cost and curve of the user in using the software are reduced, and the user experience is improved.

[0068] 2) The graphic attribute mutual driving mechanism is adopted to draw the foundation pit design drawing according to the foundation pit design parameters, to update the design parameters synchronously when the design drawing is edited, to dynamically check and real-time prompt the design parameters by embedding the foundation pit stability discrimination criterion, and to improve the convenience and practicability of the foundation pit support design.

[0069] 3) The mathematical model for evaluating the stability of the foundation pit is provided, the stability calculation of the foundation pit support structure is automatically completed in the adjustment process of the foundation pit support design scheme, the designer is assisted to optimize the design scheme, the calculation book and design drawing are finally generated, the complete design achievement is output, and the design work efficiency is significantly improved. DETAILED DESCRIPTION

[0070] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, and should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0071] Figure 1 A method flowchart provided by the embodiment of the present application is provided.

[0072] Figure 2 A logical diagram of the attribute mutual driving mechanism is provided to realize the embodiment of the present application.

[0073] Figure 3 A system block diagram provided by the embodiment of the present application is provided. DETAILED DESCRIPTION

[0074] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0075] It should be noted that the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can realize it. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection required by the present application.

[0076] Reference is made to Figure 1 , Figure 1 A flowchart of a foundation pit stability discrimination method based on a CAD-like environment attribute mutual driving mechanism designed by the present application is shown in Figure 1 The method provided by the embodiment specifically includes the following steps:

[0077] S1: determining a suitable support form according to the design requirements of the foundation pit, initializing various foundation pit design parameters, and drawing a foundation pit support structure diagram in a parameter attribute value forward driving mode in a CAD-like environment;

[0078] The present application supports the foundation pit support forms of slope excavation, soil nailing wall, cantilever / anchor / support, cement soil retaining wall and double-row pile support structure. The types and quantities of structure design parameters required by different support forms are different, and the support form needs to be determined according to the engineering site working condition, considering factors such as construction period and cost. After selecting a specific support form, the support structure is initialized according to the default design parameters, which is convenient for users to optimize the design scheme by adjusting the design parameters based on this.

[0079] S2: According to the foundation pit stability criterion, combined with the actual working conditions of the project site, the design parameters are manually optimized. The parameter adjustment results are still updated in real time using the attribute-driven diagram method to update the support structure diagram, and the built-in checking mechanism is used to check the design parameters in real time;

[0080] Since the foundation pit stability discrimination mathematical model limits the value range of parameters for various support forms, the rationality of the design parameters needs to be dynamically checked when the user adjusts the design parameters. When the parameter value exceeds the range required by the specification, the user should be reminded of the over-limit situation to facilitate timely correction.

[0081] S3: Calculate the stability of the support structure by establishing mathematical models for different support forms;

[0082] Under different support forms, the safety factor is taken as the index to establish mathematical models to calculate the safety index and determine whether the foundation pit stability meets the design requirements.

[0083] When the support form adopts slope excavation, the foundation pit stability is determined according to the following mathematical model. If the mathematical model is established, the stability of the slope excavation foundation pit model meets the design requirements, otherwise, the stability of the foundation pit model does not meet the design requirements.

[0084] ,

[0085] In the formula:

[0086] — Foundation pit stability calculation coefficient; the safety factor of the foundation pit support structure with safety levels of one, two, and three should not be less than 1.30, 1.20, and 1.10, respectively;

[0087] , — The standard values of cohesion (kPa) and internal friction angle (°) of the bottom surface of the ith soil strip determined by the total stress method, respectively;

[0088] — The specific weight (N / m 3 ) of the ith soil strip;

[0089] — The height (m) of the ith soil strip;

[0090] — The width (m) of the ith soil strip;

[0091] — The standard value of additional load (kPa) of the ith soil strip;

[0092] — The angle (°) between the tangent at the midpoint of the bottom of the ith soil strip and the horizontal line,​ When the value is negative, it is taken as positive.

[0093] —These represent the total number of stripes and the number of stripes on the active side, respectively.

[0094] When the support method adopts a cement-soil retaining wall support structure, the stability of the foundation pit is judged according to the following mathematical model. If the mathematical model is valid, the stability of the foundation pit model meets the design requirements; otherwise, the stability of the foundation pit model does not meet the design requirements.

[0095]

[0096] In the formula:

[0097] —The stability calculation coefficient for the foundation pit should not be less than 1.20;

[0098] —Self-weight of the vertical retaining wall outside the pit (kN / m);

[0099] —Self-weight of the concealed support (kN / m);

[0100] —Unit weight of the i-th soil layer (N / m³) 3 );

[0101] —Thickness (m) of the i-th soil layer;

[0102] —The passive earth pressure coefficient of the i-th soil layer;

[0103] —The active earth pressure coefficient of the i-th soil layer;

[0104] —The cohesion value (kPa) of the i-th soil layer;

[0105] C—Standard value of cohesion of the soil layer at the foundation of the wall (kPa);

[0106] —Width of wall base (m);

[0107] —Standard value of the internal friction angle of the soil layer at the wall base (°).

[0108] When the support structure is a double-row pile support structure, the stability of the foundation pit is judged according to the following mathematical model. If the mathematical model is valid, the stability of the foundation pit model meets the design requirements; otherwise, the stability of the foundation pit model does not meet the design requirements.

[0109]

[0110] In the formula:

[0111] ; the safety level of the foundation pit support structure is level one, level two, or level three Should be not less than 1.25, 1.20, 1.15 respectively;

[0112] The sum of the self-weight of the double-row piles, the pile top connecting beam and the soil between the piles (kN / m);

[0113] The standard value of the cohesion of the soil under the bottom surface of the row piles (kPa);

[0114] The standard value of the internal friction angle of the soil under the bottom surface of the row piles (°);

[0115] The center distance of the double-row piles (m);

[0116] The diameter of the front pile (m);

[0117] The diameter of the rear pile (m);

[0118] The specific weight of the i-th layer of soil (N / m 3 );

[0119] The height of the i-th layer of soil (m);

[0120] The passive earth pressure coefficient of the i-th layer of soil;

[0121] The active earth pressure coefficient of the i-th layer of soil;

[0122] The standard value of the cohesion of the i-th layer of soil (kPa).

[0123] S4: If the stability calculation is qualified, go to the next step. If the stability calculation is not qualified, modify the support design drawing in the CAD environment in a figure-driven manner to feed back the linkage update of the design attribute parameters, and automatically repeat the foundation pit stability calculation until the stability meets the design requirements;

[0124] When the foundation pit stability calculation does not meet the requirements, the design scheme can be adjusted and optimized by adjusting the design parameters, increasing the support form, replacing the support structure and the like. Common foundation pit design software is usually based on AutoCAD software for secondary development, and AutoCAD software needs to be pre-installed, which increases the use cost of the software. When the scheme is optimized, the values of the parameters are adjusted by manual input to update the support design drawing, and finally the foundation pit stability is calculated according to the manually input parameters. The present application provides a graphic attribute mutual driving mechanism in a CAD environment, which can directly edit and adjust the support design drawing without installing AutoCAD software, and the support attribute information is updated through the change of the graphic, and the support structure attribute parameters can be directly read from the modified graphic, and then the stability of the foundation pit support structure is calculated. The graphic attribute mutual driving mechanism ensures the consistency of the graphic attribute information, and improves the accuracy and reliability of the support structure calculation.

[0125] S5: feeding back the design result finally meeting the stability requirements to the client, and outputting by the client.

[0126] For the same engineering project, the present application can be used to quickly generate multiple design schemes meeting the foundation pit stability according to the site, construction period and cost, and can also be used to quickly optimize a design scheme, and finally the design scheme can be output as a calculation book, drawing and the like.

[0127] As shown in the graphic attribute mutual driving mechanism logic diagram in the Figure 2 The unified data model refers to a general mathematical model for expressing the foundation pit support elements by the graphics and attributes of point, line and surface graphics, the graphics are a collection of various geometric elements included in the graphics, the attributes include the geometric attributes and non-geometric attributes of the graphic elements, the geometric attributes include coordinates, length and direction, and the non-geometric attributes include color, material, line type, layer and design description;

[0128] The data storage management refers to storing the graphics and attributes in the unified data model in different tables of the spatial database, and associating the graphics and attributes by a unique ID to realize the binding and interaction of the graphics and attributes;

[0129] The event driven model refers to event listening to all interactive operations of the user, and sending processing instructions to the graphic attribute synchronous updating and graphic drawing engine module according to the event type and running logic;

[0130] The graphic attribute synchronous updating refers to updating the unified data model of the graphic element when the graphic or attribute data changes, and in the multi-user collaborative work scenario, the data locking and version control mechanism is established when the graphic attribute synchronous updating, the data modification history is recorded, and the data is backtracked as needed;

[0131] The graphics rendering engine refers to accurately rendering geometric information such as points, lines, and surfaces on a canvas according to graphics data in a unified data model, and outputting and displaying graphics elements according to a specified drawing style.

[0132] As shown in the figure, Figure 3 A foundation pit stability discrimination system based on a graphics attribute mutual driving mechanism includes a parameter management module, a graphics attribute mutual driving CAD module, a two-dimensional and three-dimensional graphics display module, a stability discrimination module, an achievement output module, and a statistical query module.

[0133] The parameter management module is configured to dynamically store, update, verify, and share various foundation pit support form design parameters, foundation pit standard specification index parameters, support material specification model parameters, and achievement output attributes.

[0134] The graphics attribute mutual driving CAD environment module is configured to realize bidirectional linkage update of graphics and attribute information of foundation pit support elements in a CAD-like environment, and guarantee consistency of the graphics and attribute information.

[0135] The two-dimensional and three-dimensional graphics display module is configured to stack a two-dimensional foundation pit design drawing to a commercial electronic map scene such as Baidu, and realize two-dimensional and three-dimensional design drawing linkage interactive display.

[0136] The stability discrimination module is configured to dynamically calculate and discriminate foundation pit stability based on built-in stability discrimination mathematical models corresponding to various foundation pit support forms.

[0137] The achievement output module is configured to output drawings, calculation books, and design manuals corresponding to a foundation pit design scheme under the condition that the foundation pit stability requirement is met.

[0138] The statistical query module is configured to query material category expense details and estimated workloads corresponding to the foundation pit design scheme.

[0139] The embodiments of the present application provide a computer readable storage medium, and the computer readable storage medium stores a computer program.

[0140] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can be in the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can be in the form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

[0141] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks in the flowcharts and / or combination thereof. Figure 1 one or more flowcharts and / or blocks in the flowcharts and / or combination thereof.

[0142] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks in the flowcharts and / or combination thereof. Figure 1 one or more flowcharts and / or blocks in the flowcharts and / or combination thereof.

[0143] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks in the flowcharts and / or combination thereof. Figure 1 one or more flowcharts and / or blocks in the flowcharts and / or combination thereof.

[0144] In one typical configuration, the computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0145] The memory can include non-persistent memory and / or volatile memory, such as a random access memory (RAM) including a cache area for the temporary storage of data. The memory can also include non-volatile memory, such as read only memory (ROM), electrically programmable read only memory (EPROM), or electrically erasable programmable read only memory (EEPROM), for the storage of software that is read during runtime. The memory is an example of computer readable media.

[0146] Computer-readable media includes permanent and non-permanent, movable and non-movable media that can implement information storage by any method or technology. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible by a computing device. According to the definition herein, computer-readable media does not include transitory media such as modulated data signals and carriers.

[0147] Those skilled in the art can have various modifications within the scope and spirit of the present application without departing from the scope and spirit of the present application, such as using features of one embodiment in another embodiment to obtain another embodiment. Any modification, equivalent replacement and improvement made within the technical concept of the present application should be within the scope of the present application.

Claims

1. A foundation pit stability discrimination method based on a graph attribute mutual driving mechanism, characterized in that, The method comprises the following specific steps: S1: determining a suitable supporting form according to the design requirements of the foundation pit, initializing various design parameters of the foundation pit, and drawing a foundation pit supporting structure sketch in a CAD-like environment in a parameter attribute value forward driving mode; S2: manually optimizing the design parameters of the foundation pit according to the stability discrimination criteria of the foundation pit and the actual working conditions of the project site, and updating the supporting structure sketch in real time by adjusting the parameters in the attribute driving mode, and checking the design parameters in real time by the built-in attribute checking mechanism; S3: automatically extracting various design parameters of the foundation pit from the foundation pit supporting structure sketch by using the built-in mathematical model for calculating the stability of the foundation pit under different supporting forms, and calculating the stability of the foundation pit supporting structure corresponding to the sketch in real time; S4: if the stability discrimination is qualified and the design scheme of the foundation pit is confirmed, the next step is performed, if the stability discrimination is not qualified, the user modifies the graphic elements in the supporting design sketch based on the CAD-like environment, realizes the feedback linkage updating of the design parameters of the foundation pit in the reverse graphic driving attribute mode, and automatically calculates the stability of the foundation pit in real time until the stability discrimination is qualified, and the user can further optimize the design scheme of the foundation pit based on the calculation results of the stability to save the cost; S5: intuitively displaying the design scheme of the foundation pit in the CAD-like environment in a two-dimensional and three-dimensional interactive mode, and outputting various design results of the foundation pit; The model for calculating the stability of the foundation pit in the step S3 comprises: slope excavation, soil nailing wall, cantilever / anchor / lateral support, cement soil retaining wall and double-row pile supporting structure; When the supporting form adopts the slope excavation, the stability of the foundation pit is discriminated according to the following mathematical model, if the mathematical model is established, the stability of the slope excavation foundation pit model meets the design requirements, otherwise, the stability of the foundation pit model does not meet the design requirements; ， In the formula: The foundation pit stability calculation coefficient; the foundation pit supporting structure safety level is one, two, three Should not be less than 1.30, 1.20 and 1.10 respectively; , — the standard values of the cohesion and internal friction angle of the i-th soil layer bottom surface determined by the total stress method, respectively; - the weight of the ith slice; height of the ith bar; —The width of the i-th soil strip; - the standard value of the additional load of the i-th section; the angle between the tangent at the midpoint of the ith strip and the horizontal line, the absolute value of the negative value; — respectively the total number of strips and the number of strips on the active side; When the supporting form adopts the cement soil retaining wall supporting structure, the stability of the foundation pit is discriminated according to the following mathematical model, if the mathematical model is established, the stability of the foundation pit model meets the design requirements, otherwise, the stability of the foundation pit model does not meet the design requirements; ， In the formula: - the calculation coefficient of the foundation pit stability; it should not be less than 1.20; — Pit vertical retaining wall self-weight; - dark support self-weight; - the specific weight of the i-th layer of soil; - thickness of the i-th layer of soil; - passive earth pressure coefficient of the i-th layer of soil; - the active earth pressure coefficient of the i-th layer of earth; - the cohesion index of the i-th layer of soil; C is the standard value of the cohesion of the wall base soil layer; — wall substrate width; - standard value of internal friction angle of wall base soil layer; When the supporting form adopts the double-row pile supporting structure, the stability of the foundation pit is discriminated according to the following mathematical model, if the mathematical model is established, the stability of the foundation pit model meets the design requirements, otherwise, the stability of the foundation pit model does not meet the design requirements; ， In the formula: The safety level of the foundation pit supporting structure is level one, level two or level three Should be not less than 1.25, 1.20, 1.15 respectively; - the sum of the weight of the double row piles, the pile top beam and the soil between the piles; - the standard value of the cohesion of the soil under the bottom surface of the row piles; - Standard value of the internal friction angle of the soil under the bottom surface of the row piles; - double-row pile center distance; — diameter of the pile; - diameter of the rear pile; - Height of the i-th layer of soil.

2. The method according to claim 1, wherein, The CAD-like environment is a graphic drawing and editing human-computer interaction environment based on point, line and surface graphic elements, which is built-in with a graphic attribute interactive mechanism including a unified data model, data storage management, event driven model, data synchronization update and graphic drawing engine, so as to realize the consistency of the graphics and attributes; The unified data model refers to a general mathematical model for expressing the foundation pit supporting elements by using the graphics and attributes of the point, line and surface graphic elements, the graphics are the collection of various geometric elements contained in the graphic elements, the attributes express the geometric attributes and non-geometric attributes of the graphic elements, the geometric attributes are coordinates, length and direction, and the non-geometric attributes are color, material, line type, layer and design description. The data storage management refers to storing the graphics and attributes in the unified data model in different tables of the spatial database respectively, and associating the graphics and attributes with unique IDs to realize the binding and interaction of the graphics and attributes; The event-driven model refers to event listening to all interactive operations of the user, and sending processing instructions to the graphic attribute synchronous updating and graphic rendering engine module according to the event type and running logic; The graphic attribute synchronous updating refers to updating the unified data model of the graph element in time when the graphic or attribute data changes, and in the multi-user collaborative work scenario, the data locking and version control mechanism is also established when the graphic attribute synchronous updating, the modification history of the data is recorded, and the data is backtracked on demand; The graphic rendering engine refers to accurately rendering the point, line and surface geometric information on the canvas according to the graphic data in the unified data model, and outputting and displaying according to the specified drawing style.

3. A system for determining the stability of a foundation pit based on a graph mutual driving mechanism, suitable for the method of claim 1 or 2, characterized in that, The parameter management module, the graphic attribute mutual driving CAD environment module, the two-dimensional and three-dimensional graphic display module, the stability discrimination module, the achievement output module and the statistical query module are included. The parameter management module is used for dynamic storage, updating, verification and sharing of design parameters of various foundation pit support forms, standard specification index parameters of foundation pits, support material specifications and model parameters, and achievement output attribute parameters; The graphic attribute mutual driving CAD environment module is used for realizing bidirectional linkage updating of graphic and attribute information of foundation pit support elements in the CAD environment, and guaranteeing the consistency of the graphic and attribute information; The two-dimensional and three-dimensional graphic display module is used for stacking the two-dimensional foundation pit design graph to the Baidu commercial electronic map scene by the user, and realizing the linkage interactive display of the two-dimensional and three-dimensional design graphs; The stability discrimination module is used for dynamically calculating and discriminating the stability of the foundation pit based on the built-in stability discrimination mathematical model corresponding to various foundation pit support forms; The achievement output module is used for realizing the drawings, calculation books and design manuals corresponding to the foundation pit design scheme under the condition of meeting the stability requirements of the foundation pit; The statistical query module is used for querying the material category expense details and estimated workload corresponding to the foundation pit design scheme.

4. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program is executed by the processor to realize all steps of the foundation pit stability discrimination method based on the graphic attribute mutual driving mechanism in claim 1 or 2.

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