Foundation pit stability judgment method and system based on graph mutual drive mechanism and medium

Abstract

The invention relates to a foundation pit stability judgment method and system based on a graph mutual driving mechanism and a medium. The method comprises the steps that an appropriate foundation pit supporting form is determined according to the design requirement of a foundation pit, various foundation pit design parameters are initialized, and a foundation pit supporting structure sketch is drawn in a parameter attribute value forward driving mode in a similar CAD environment; according to the foundation pit stability judgment criterion, the design parameters are manually adjusted and optimized in combination with the actual working condition of a project site, the supporting structure sketch is still updated in real time in the mode of the affiliation driving graph according to the parameter adjustment result, and in addition, foundation pit supporting parameters are updated in the mode of immediate feedback linkage in the mode of the affiliation driving graph in the editable supporting structure graph; the stability of the foundation pit supporting structure is dynamically checked in real time in the whole process, after it is judged that the stability meets design requirements, a foundation pit supporting design scheme is visually displayed in a two-dimensional and three-dimensional linkage type interaction mode, and various design results are output. According to the method, two-way mutual driving of drawings of foundation pit supporting design can be achieved, the design scheme can be conveniently and rapidly modified and perfected, and the foundation pit supporting design efficiency and quality are improved.

Description

Technical Field

[0001] The present invention relates to the field of foundation pit stability determination, and in particular to a foundation pit stability determination method, system and medium based on a drawing attribute mutual driving mechanism in a CAD-like environment. Background Art

[0002] With the rapid development of my country's construction industry, foundation pit projects are gradually becoming larger and more complex, which brings great difficulties to the calculation and judgment of foundation pit stability. In order to express the foundation pit support design structure vividly and intuitively, commercial foundation pit design software generally needs to be pre-installed with AutoCAD software, and then secondary development is carried out based on AutoCAD to generate foundation pit support structure diagrams based on design attributes in a one-way attribute-driven diagram. The software simulates the stress and deformation of the foundation pit support structure under different working conditions to carry out foundation pit stability calculations. When the stability does not meet the requirements, the software can only update the foundation pit support structure diagram by repeatedly modifying the design attribute data to adjust the support design scheme. It is impossible to reversely update the foundation pit design attributes by interactively editing the foundation pit support structure diagram, and then recalculate the stability of the foundation pit in real time. When the foundation pit support structure is more complex, it is easy to extract wrong attribute information, resulting in errors in the judgment of foundation pit stability.

[0003] Chinese patent CN107315868A introduces a design method and system for the stability of foundation pit engineering based on secondary development of Revit. This method constructs a foundation pit model in Revit and automatically calculates the stability of the foundation pit by automatically extracting effective information from the model. Although the stability assessment can be quickly performed by reading the model information, it still needs to rely on the Revit operating environment. Chinese patent CN117271591A introduces a method for realizing two-way linkage between geological profiles and survey data through a survey database. This method keeps the survey attributes and profiles synchronized through the database. The rendering of the profile depends on the CAD environment and the front-end graphics rendering and parsing controls, and cannot automatically achieve real-time image attribute mutual drive, which affects the efficiency and quality of the output of survey results. Summary of the invention

[0004] The purpose of the present invention is to provide a foundation pit stability judgment method, system and medium based on the mutual driving mechanism of drawing attributes in a CAD-like environment, which can realize the two-way mutual driving of drawing attributes of foundation pit support design, facilitate rapid modification and improvement of design schemes, and improve the efficiency and quality of foundation pit support design.

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

[0006] S1: Determine the appropriate support form according to the foundation pit design requirements, initialize various foundation pit design parameters, and draw the foundation pit support structure sketch in a CAD-like environment using the parameter attribute value forward drive method;

[0007] S2: Based on the foundation pit stability judgment criteria and combined with the actual working conditions of the project site, the foundation pit design parameters are manually optimized. The parameter adjustment results are still updated in real time in the attribute-driven drawing mode to update the support structure sketch, and the design parameters are checked in real time by the built-in attribute checking mechanism;

[0008] S3: By using the built-in mathematical model for calculating the stability of foundation pits under different support forms, various foundation pit design parameters are automatically extracted from the sketch of the foundation pit support structure, and the stability of the foundation pit support structure corresponding to the sketch is verified in real time;

[0009] S4: If the stability judgment is qualified and the foundation pit design scheme is confirmed, go to the next step. If the stability judgment is unqualified, the user can interactively modify the graphics in the support design sketch based on the CAD-like environment to realize the reverse feedback linkage update of the foundation pit support design parameters in the form of graphics-driven attributes, and automatically perform the foundation pit stability calculation in real time until the stability judgment is qualified. The user can further optimize the foundation pit support design scheme based on the stability calculation results to achieve the purpose of saving construction costs;

[0010] S5: In a CAD-like environment, the foundation pit support design scheme is intuitively displayed in a 2D and 3D interactive manner, and various design results are output.

[0011] The CAD-like environment is a human-computer interactive working environment for graphics drawing and editing based on point, line and surface primitive elements. The environment has a built-in graphic attribute mutual driving mechanism including a unified mathematical model, data storage management, an event-driven model, data synchronization update, and a graphics drawing engine to achieve consistency between graphics and attributes.

[0012] The unified data model refers to a general mathematical model that expresses foundation pit support elements with graphics and attributes of point, line, and surface primitives. The graphics are a collection of various geometric elements contained in the primitives. The attributes include 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.

[0013] 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 with a unique ID to achieve binding and interaction between the graphics and attributes;

[0014] The event-driven model refers to monitoring all user interaction operations and sending processing instructions to the data synchronization update and graphics rendering engine modules according to the event type and operation logic;

[0015] The synchronous updating of graphic attributes refers to timely updating of the unified mathematical model of graphic elements when the graphic or attribute data changes. In the scenario of multi-user collaborative work, a data locking and version control mechanism is also established during the synchronous updating of graphic attributes to record the modification history of data and realize data backtracking on demand.

[0016] The graphics rendering engine refers to accurately drawing geometric information such as points, lines, and surfaces on the canvas according to the graphics data in the unified data model, and outputting and displaying the graphics elements according to the specified drawing style.

[0017] The models for calculating the stability of foundation pit support in step S3 include: slope excavation, soil nail wall, cantilever / anchor pull / support type, 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] Where:

[0021] F s -Calculation coefficient of foundation pit stability; F of foundation pit support structure with safety level of one, two and three s They should not be less than 1.30, 1.20 and 1.10 respectively;

[0022] - are the standard values ​​of cohesion (kPa) and internal friction angle (°) of the bottom surface of the i-th soil strip determined by the total stress method;

[0023] r i -The density of the i-th soil strip (N / m 3 );

[0024] h i -The height of the i-th soil strip (m);

[0025] b i -Width of the i-th soil strip (m);

[0026] q i -Standard value of additional load for the i-th soil strip (kPa);

[0027] α i -The angle between the tangent line at the midpoint of the bottom of the i-th soil strip and the horizontal line (°), α i When it is negative, take the positive value;

[0028] n,n 1 - respectively the total number of stripes and the number of active side stripes;

[0029] When the support form adopts soil nail wall, the overall stability of the foundation pit is judged 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.

[0030]

[0031] Where:

[0032] F s -Calculation coefficient of foundation pit stability; F of foundation pit support structure with safety level of one, two and three s They should not be less than 1.30, 1.15 and 1.05 respectively;

[0033] - are the standard values ​​of cohesion (kPa) and internal friction angle (°) of the bottom surface of the i-th soil strip determined by the total stress method;

[0034] r i -The density of the i-th soil strip (N / m 3 );

[0035] h i -The height of the i-th soil strip (m);

[0036] b i -Width of the i-th soil strip (m);

[0037] q i -Standard value of additional load for the i-th soil strip (kPa);

[0038] α i -The angle between the tangent line at the midpoint of the bottom of the i-th soil strip or the intersection of the i-th soil nail and the sliding arc and the horizontal line (°);

[0039] θ k - Angle between the kth soil nail layer and the horizontal line (°);

[0040] a k -The inclination angle of the k-th soil nail layer (°)

[0041] N uk -Standard value of ultimate pull-out strength of soil nails in the kth layer (KN);

[0042] S xk - horizontal spacing of soil nails in the kth layer (m);

[0043] k-number of soil nail layers that the sliding arc passes through;

[0044] n,n 1 - respectively the total number of stripes and the number of active side stripes;

[0045] When the support form adopts cantilever / anchor pull / support type support structure, the overall stability of the foundation pit is judged 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.

[0046]

[0047] Where:

[0048] F s -Calculation coefficient of foundation pit stability; F of foundation pit support structure with safety level of one, two and three s They should not be less than 1.30, 1.15 and 1.05 respectively;

[0049] - are the standard values ​​of cohesion (N) and internal friction angle (°) determined by the total stress method at the bottom of the i-th soil strip;

[0050] r i -The density of the i-th soil strip (N / m 3 );

[0051] h i -The height of the i-th soil strip (m);

[0052] b i -Width of the i-th soil strip (m);

[0053] q i -Standard value of additional load for the i-th soil strip (kPa);

[0054] α i -The angle between the tangent line at the midpoint of the bottom of the i-th soil strip or the intersection of the i-th anchor rod and the sliding arc and the horizontal line (°);

[0055] θ k - Angle between the anchor of the kth layer and the horizontal line (°);

[0056] a k - inclination angle of the anchor bolt at the kth layer (°);

[0057] N uk - Ultimate tensile force of anchor bolts in the kth layer (KN);

[0058] S xk - horizontal spacing of anchors in the kth layer (m);

[0059] k-number of anchor layers that the sliding arc passes through;

[0060] n,n 1 - respectively the total number of stripes and the number of active side stripes;

[0061] When the support form adopts the 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 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.

[0062]

[0063] Where:

[0064] F s -Calculation coefficient of foundation pit stability; should not be less than 1.20;

[0065] G 1 - Deadweight of vertical retaining wall outside the pit (kN / m);

[0066] G 2 - Deadweight of concealed support (kN / m);

[0067] r i -The density of the i-th layer of soil (N / m 3 );

[0068] H i -Thickness of the i-th soil layer (m);

[0069] k pi - passive earth pressure coefficient of the i-th soil layer;

[0070] k ai - active earth pressure coefficient of the i-th soil layer;

[0071] C i - Cohesion value of the i-th soil layer (kPa);

[0072] C-standard value of cohesion of soil layer at the base of the wall (kPa);

[0073] B-Wall base width (m);

[0074] - Standard value of internal friction angle of soil layer at the wall base (°);

[0075] When the support form 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 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.

[0076]

[0077] Where:

[0078] F s -Calculation coefficient of foundation pit stability; F of foundation pit support structure with safety level of level 1, level 2 and level 3 sThey should be no less than 1.25, 1.20, and 1.15 respectively;

[0079] G-the sum of the self-weight of double-row piles, pile top connecting beams and soil between piles (kN / m);

[0080] C-standard value of cohesion of soil under the bottom of the pile row (kPa);

[0081] - Standard value of internal friction angle of soil under the bottom of pile row (°);

[0082] S y - Center distance between double rows of piles (m);

[0083] d 1 - Diameter of the front pile (m);

[0084] d 2 - diameter of the rear pile (m);

[0085] r i -The density of the i-th layer of soil (N / m 3 );

[0086] h i -Height of the i-th soil layer (m);

[0087] k pi - passive earth pressure coefficient of the i-th soil layer;

[0088] k ai - active earth pressure coefficient of the i-th soil layer;

[0089] C i - Standard value of soil cohesion of the i-th layer (kPa);

[0090] In a second aspect, the present invention provides a foundation pit stability determination system based on a graph-attribute mutual drive mechanism applicable to the above-mentioned method, comprising a parameter management module, a graph-attribute mutual drive CAD environment module, a two-dimensional and three-dimensional graphics display module, a stability determination module, a result output module and a statistical query module;

[0091] The parameter management module is used for dynamic storage, updating, verification and sharing of various foundation pit support form design parameters, foundation pit standard specification index parameters, support material specification model parameters, output attributes and other parameters;

[0092] The graph-attribute mutual-drive CAD environment module is used to realize the bidirectional linkage update of the graph and attribute information of the foundation pit support elements in the CAD environment, thereby ensuring the consistency of the graph and attribute information;

[0093] The two-dimensional and three-dimensional graphic display module allows users to overlay the two-dimensional foundation pit design drawing on a commercial electronic map scene such as Baidu, and realize the linkage and interactive display of the two-dimensional and three-dimensional design drawings;

[0094] The stability determination module is used to dynamically calculate and determine the stability of the foundation pit based on the built-in stability determination mathematical models corresponding to various foundation pit support forms and actual foundation pit design parameters;

[0095] The achievement output module is used to produce drawings, calculation books and design specifications corresponding to the foundation pit design scheme under the condition that the foundation pit stability requirements are met;

[0096] The statistical query module is used to query the material category cost details and estimated workload corresponding to the foundation pit design plan.

[0097] In a third aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the method for determining foundation pit stability based on the graph-attribute mutual driving mechanism as described above are implemented.

[0098] The beneficial effects of adopting the above embodiment are:

[0099] 1) The present invention independently develops a CAD-like environment, which does not require the environmental support of various CAD software, reduces the dependence on commercial software, and at the same time retains the drawing habits of designers in drawing foundation pit support structure diagrams, reduces the learning cost and curve of users using the software, and improves the user experience.

[0100] 2) The mutual driving mechanism of drawings is used to draw the foundation pit design drawing according to the foundation pit design parameters, and the design parameters are updated synchronously when editing the design drawing. The built-in foundation pit stability judgment criteria are used to dynamically check the design parameters and provide real-time prompts, thereby improving the convenience and practicality of foundation pit support design.

[0101] 3) Provide a mathematical model for foundation pit stability assessment of common foundation pit support methods. During the adjustment of the foundation pit support design scheme, the stability calculation of the foundation pit support structure is automatically completed to assist designers in optimizing the design scheme, and finally generate calculation books and design drawings, outputting complete design results, which significantly improves the design work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0102] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0103] Figure 1 A flow chart of the method provided in the embodiment of the present application;

[0104] Figure 2 To realize this application, the diagram belongs to the logic diagram of the mutual drive mechanism;

[0105] Figure 3 A system block diagram provided for an embodiment of the present application. DETAILED DESCRIPTION

[0106] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0107] It should be noted that the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0108] See also Figure 1 , Figure 1 A flow chart of a foundation pit stability determination method based on a graph-attribute mutual driving mechanism in a CAD-like environment designed by the present invention is shown in FIG. Figure 1 As shown, the method provided in this embodiment specifically includes the following steps:

[0109] S1: Determine the appropriate support form according to the foundation pit design requirements, initialize various foundation pit design parameters, and draw the foundation pit support structure diagram in a CAD-like environment using the parameter attribute value forward drive method;

[0110] The present invention supports foundation pit support forms such as slope excavation, soil nail wall, cantilever / anchor pull / support, cement soil retaining wall and double-row pile support structure. Different support forms require different types and quantities of structural design parameters. The support form needs to be determined based on the project site conditions, comprehensive consideration of construction period, cost and other factors. After selecting a specific support form, the support structure is initialized according to the default design parameters, so that users can optimize the design scheme by adjusting the design parameters based on this.

[0111] S2: According to the foundation pit stability judgment criteria, the design parameters are manually optimized in combination with the actual working conditions of the project site. The parameter adjustment results are still updated in real time by the attribute-driven diagram method, and the design parameters are checked in real time by the built-in verification mechanism;

[0112] Since the mathematical model for judging the stability of foundation pits restricts the range of values ​​of the parameters of various support forms, the rationality of the design parameters needs to be dynamically checked when the user adjusts the design parameters. When the parameter values ​​exceed the range required by the specification, the user should be promptly reminded of the over-limit situation to facilitate timely correction.

[0113] S3: Verify the stability of the support structure by establishing mathematical models under different support forms;

[0114] Under different support forms, the foundation pit stability calculation coefficient is used as a unified indicator, and mathematical models are established to calculate the safety index and determine whether the foundation pit stability meets the design requirements.

[0115] 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;

[0116]

[0117] Where:

[0118] F s -Calculation coefficient of foundation pit stability; F of foundation pit support structure with safety level of one, two and three s They should not be less than 1.30, 1.20 and 1.10 respectively;

[0119] - are the standard values ​​of cohesion (kPa) and internal friction angle (°) of the bottom surface of the i-th soil strip determined by the total stress method;

[0120] r i -The density of the i-th soil strip (N / m 3 );

[0121] h i -The height of the i-th soil strip (m);

[0122] b i -Width of the i-th soil strip (m);

[0123] q i -Standard value of additional load for the i-th soil strip (kPa);

[0124] α i -The angle between the tangent line at the midpoint of the bottom of the i-th soil strip and the horizontal line (°), α i When it is negative, take the positive value;

[0125] n,n 1 -The total number of stripes and the number of active-side stripes, respectively.

[0126] When the support form adopts soil nail wall, the overall stability of the foundation pit is judged 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.

[0127]

[0128] Where:

[0129] F s -Calculation coefficient of foundation pit stability; F of foundation pit support structure with safety level of one, two and three s They should not be less than 1.30, 1.15 and 1.05 respectively;

[0130] - are the standard values ​​of cohesion (kPa) and internal friction angle (°) of the bottom surface of the i-th soil strip determined by the total stress method;

[0131] r i -The density of the i-th soil strip (N / m 3 );

[0132] h i -The height of the i-th soil strip (m);

[0133] b i -Width of the i-th soil strip (m);

[0134] q i -Standard value of additional load for the i-th soil strip (kPa);

[0135] α i -The angle between the tangent line at the midpoint of the bottom of the i-th soil strip or the intersection of the i-th soil nail and the sliding arc and the horizontal line (°);

[0136] θ k - Angle between the kth soil nail layer and the horizontal line (°);

[0137] a k -The inclination angle of the k-th soil nail layer (°)

[0138] N uk -Standard value of ultimate pull-out strength of soil nails in the kth layer (KN);

[0139] S xk - horizontal spacing of soil nails in the kth layer (m);

[0140] k-number of soil nail layers that the sliding arc passes through;

[0141] n,n 1 -The total number of stripes and the number of active-side stripes, respectively.

[0142] When the support form adopts cantilever / anchor pull / support type support structure, the overall stability of the foundation pit is judged 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.

[0143]

[0144] Where:

[0145] F s -Calculation coefficient of foundation pit stability; F of foundation pit support structure with safety level of one, two and three s They should not be less than 1.30, 1.15 and 1.05 respectively;

[0146] - are the standard values ​​of cohesion (N) and internal friction angle (°) determined by the total stress method at the bottom of the i-th soil strip;

[0147] r i -The density of the i-th soil strip (N / m 3 );

[0148] h i -The height of the i-th soil strip (m);

[0149] b i -Width of the i-th soil strip (m);

[0150] q i -Standard value of additional load for the i-th soil strip (kPa);

[0151] α i -The angle between the tangent line at the midpoint of the bottom of the i-th soil strip or the intersection of the i-th anchor rod and the sliding arc and the horizontal line (°);

[0152] θ k - Angle between the anchor of the kth layer and the horizontal line (°);

[0153] a k - inclination angle of the anchor bolt at the kth layer (°);

[0154] N uk - Ultimate tensile force of anchor bolts in the kth layer (KN);

[0155] S xk - horizontal spacing of anchors in the kth layer (m);

[0156] k-number of anchor layers that the sliding arc passes through;

[0157] n,n 1 -The total number of stripes and the number of active-side stripes, respectively.

[0158] When the support form adopts the 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 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.

[0159]

[0160] Where:

[0161] F s -Calculation coefficient of foundation pit stability; should not be less than 1.20;

[0162] G 1 - Deadweight of vertical retaining wall outside the pit (kN / m);

[0163] G 2 - Deadweight of concealed support (kN / m);

[0164] r i -The density of the i-th layer of soil (N / m 3 );

[0165] H i -Thickness of the i-th soil layer (m);

[0166] k pi - passive earth pressure coefficient of the i-th soil layer;

[0167] k ai - active earth pressure coefficient of the i-th soil layer;

[0168] C i - Cohesion value of the i-th soil layer (kPa);

[0169] C-standard value of cohesion of soil layer at the base of the wall (kPa);

[0170] B-Wall base width (m);

[0171] -Standard value of internal friction angle of soil layer at the wall base (°).

[0172] When the support form 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 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.

[0173]

[0174] Where:

[0175] F s -Calculation coefficient of foundation pit stability; F of foundation pit support structure with safety level of level 1, level 2 and level 3 sThey should be no less than 1.25, 1.20, and 1.15 respectively;

[0176] G-the sum of the self-weight of double-row piles, pile top connecting beams and soil between piles (kN / m);

[0177] C-standard value of cohesion of soil under the bottom of the pile row (kPa);

[0178] - Standard value of internal friction angle of soil under the bottom of pile row (°);

[0179] S y - Center distance between double rows of piles (m);

[0180] d 1 - Diameter of the front pile (m);

[0181] d 2 - diameter of the rear pile (m);

[0182] r i -The density of the i-th layer of soil (N / m 3 );

[0183] h i -Height of the i-th soil layer (m);

[0184] k pi - passive earth pressure coefficient of the i-th soil layer;

[0185] k ai - active earth pressure coefficient of the i-th soil layer;

[0186] C i -Standard value of cohesion of the i-th layer of soil (kPa).

[0187] S4: If the stability calculation is qualified, go to the next step. If the stability calculation is unqualified, modify the support design drawing in a CAD-like environment to feedback and update the design attribute parameters, and automatically repeat the foundation pit stability calculation until the stability meets the design requirements;

[0188] When the calculation of foundation pit stability does not meet the requirements, the design scheme can be adjusted and optimized by adjusting design parameters, adding support forms, replacing support structures, etc. 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 cost of using the software. When optimizing the scheme, the support design drawing is updated by adjusting the parameter values ​​by manual input, and finally the foundation pit stability is still calculated based on the manually input parameters. The present invention provides a drawing attribute mutual drive mechanism in a CAD-like environment, which can directly edit and adjust the support design drawing without installing AutoCAD software, and link the update of support attribute information through changes in graphics, and can directly read the support structure attribute parameters from the modified graphics, and then carry out the verification of the stability of the foundation pit support structure. The drawing attribute mutual drive mechanism is used to ensure the consistency of the drawing attribute information and improve the accuracy and reliability of the support structure calculation.

[0189] S5: The design results that ultimately meet the stability requirements are fed back to the client and output by the client.

[0190] For the same engineering project, this patented method can be used to quickly generate multiple design schemes that meet the stability of the foundation pit based on the site, construction period, and cost conditions. It can also be used to quickly optimize a certain design scheme. The final design scheme can be output as calculation books, drawings, and other materials as required.

[0191] like Figure 2 The figure shown is a logic diagram of the mutual drive mechanism. The unified data model refers to a general mathematical model that expresses foundation pit support elements with graphics and attributes of point, line, and surface primitives. The graphics are a collection of various geometric elements contained in the primitives. The attributes include 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.

[0192] 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 with a unique ID to achieve binding and interaction between the graphics and attributes;

[0193] The event-driven model refers to monitoring all interactive operations of the user, and sending processing instructions to the graphic synchronization update and graphics drawing engine module according to the event type and operation logic;

[0194] The synchronous updating of graphic attributes refers to timely updating of the unified data model of graphic elements when the graphic or attribute data changes. In the scenario of multi-user collaborative work, a data locking and version control mechanism is also established during the synchronous updating of graphic attributes to record the modification history of data and realize data backtracking on demand;

[0195] The graphics rendering engine refers to accurately drawing geometric information such as points, lines, and surfaces on the canvas according to the graphics data in the unified data model, and outputting and displaying the graphics elements according to the specified drawing style.

[0196] like Figure 3 As shown, a foundation pit stability judgment system based on the graph-attribute mutual driving mechanism includes a parameter management module, a graph-attribute mutual driving CAD module, a two-dimensional and three-dimensional graphics display module, a stability judgment module, a result output module and a statistical query module;

[0197] The parameter management module is used for dynamic storage, updating, verification and sharing of various foundation pit support form design parameters, foundation pit standard specification index parameters, support material specification model parameters, output attributes and other parameters;

[0198] The graph-attribute mutual-drive CAD environment module is used to realize the bidirectional linkage update of the graph and attribute information of the foundation pit support elements in the CAD environment, thereby ensuring the consistency of the graph and attribute information;

[0199] The two-dimensional and three-dimensional graphic display module allows users to overlay the two-dimensional foundation pit design drawing on a commercial electronic map scene such as Baidu, and realize the linkage and interactive display of the two-dimensional and three-dimensional design drawings;

[0200] The stability determination module is used to dynamically calculate and determine the stability of the foundation pit based on the built-in stability determination mathematical models corresponding to various foundation pit support forms and actual foundation pit design parameters;

[0201] The achievement output module is used to produce drawings, calculation books and design specifications corresponding to the foundation pit design scheme under the condition that the foundation pit stability requirements are met;

[0202] The statistical query module is used to query the material category cost details and estimated workload corresponding to the foundation pit design plan.

[0203] An embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, all steps of the method for determining foundation pit stability based on the graph-attribute mutual driving mechanism as described above are implemented.

[0204] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0205] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0206] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0207] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0208] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0209] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0210] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. 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 technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0211] Those skilled in the art may implement the present invention in a variety of variations without departing from the scope and essence of the present invention, such as using a feature of one embodiment to obtain another embodiment. Any modification, equivalent substitution and improvement made within the technical concept of the present invention shall be within the scope of the present invention.

Claims

1. A method for judging the stability of foundation pit based on the graph mutual driving mechanism, characterized in that: The specific steps include: S1: Determine the appropriate support form according to the foundation pit design requirements, initialize various foundation pit design parameters, and draw the foundation pit support structure sketch in a CAD-like environment using the parameter attribute value forward drive method; S2: Based on the foundation pit stability judgment criteria and combined with the actual working conditions of the project site, the foundation pit design parameters are manually optimized. The parameter adjustment results are still updated in real time in the attribute-driven drawing mode to update the support structure sketch, and the design parameters are checked in real time by the built-in attribute checking mechanism; S3: By using the built-in mathematical model for calculating the stability of foundation pits under different support forms, various foundation pit design parameters are automatically extracted from the sketch of the foundation pit support structure, and the stability of the foundation pit support structure corresponding to the sketch is verified in real time; S4: If the stability judgment is qualified and the foundation pit design scheme is confirmed, go to the next step. If the stability judgment is unqualified, the user can interactively modify the graphics in the support design sketch based on the CAD-like environment to realize the reverse feedback linkage update of the foundation pit support design parameters in the form of graphics-driven attributes, and automatically perform the foundation pit stability calculation in real time until the stability judgment is qualified. The user can further optimize the foundation pit support design scheme based on the stability calculation results to achieve the purpose of saving construction costs; S5: In a CAD-like environment, the foundation pit support design scheme is intuitively displayed in a two-dimensional and three-dimensional interactive manner, and various foundation pit support design results are output.

2. According to claim 1, a method for determining foundation pit stability based on graph mutual driving mechanism is characterized in that: The CAD-like environment is a human-computer interactive environment for graphics drawing and editing based on point, line and surface primitive elements. The environment has a built-in graphic attribute mutual driving mechanism including a unified mathematical model, data storage management, an event-driven model, data synchronization update, and a graphics drawing engine to achieve consistency between graphics and attributes.

3. A method for determining foundation pit stability based on graph-attribute mutual driving mechanism according to claim 2, characterized in that: The unified data model refers to a general mathematical model that expresses foundation pit support elements with graphics and attributes of point, line, and surface primitives. The graphics are a collection of various geometric elements contained in the primitives. 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, and associating the graphics and attributes with a unique ID to achieve binding and interaction between the graphics and attributes; The event-driven model refers to monitoring all interactive operations of the user, and sending processing instructions to the graphic synchronization update and graphics drawing engine module according to the event type and operation logic; The synchronous updating of graphic attributes refers to timely updating of the unified data model of graphic elements when the graphic or attribute data changes. In the scenario of multi-user collaborative work, a data locking and version control mechanism is also established during the synchronous updating of graphic attributes to record the modification history of data and realize data backtracking on demand; The graphics drawing engine refers to accurately drawing geometric information such as points, lines, and surfaces on the canvas according to the graphics data in the unified data model, and outputting and displaying them in accordance with the specified drawing style.

4. The method for determining foundation pit stability based on the graph mutual driving mechanism according to claim 1 is characterized in that: The models for calculating the stability of foundation pit support in step S3 include: slope excavation, soil nail wall, cantilever / anchor pull / support type, cement soil retaining wall and double row pile support structure; 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; Where: F s —Calculation coefficient of foundation pit stability; F of foundation pit support structure with safety level of one, two and three s They should not be less than 1.30, 1.20 and 1.10 respectively; c i , — are the standard values ​​of cohesion and internal friction angle determined by the total stress method at the bottom of the i-th soil strip; r i —weight of the i-th soil strip; h i —the height of the ith soil strip; b i —the width of the i-th soil strip; q i —Standard value of additional load for the ith soil strip; α i —The angle between the tangent line at the midpoint of the bottom of the i-th soil strip and the horizontal line, α i When it is negative, take the positive value; n,n1—respectively the total number of stripes and the number of active-side stripes.

5. The method for determining foundation pit stability based on the graph-attribute mutual driving mechanism according to claim 4 is characterized in that: When the support form adopts soil nail wall, the overall stability of the foundation pit is judged 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. Where: F s —Calculation coefficient of foundation pit stability; F of foundation pit support structure with safety level of one, two and three s They should not be less than 1.30, 1.15 and 1.05 respectively; α i —The angle between the tangent line at the midpoint of the bottom of the i-th soil strip or the intersection of the i-th soil nail and the sliding arc and the horizontal line; θ k —The angle between the kth soil nail layer and the horizontal line; a k —The inclination angle of the kth soil nail layer; N uk —Standard value of ultimate pull-out strength of soil nails in the kth layer; S xk —Horizontal spacing of soil nails in the kth layer; k—Number of soil nail layers that the sliding arc passes through.

6. The method for determining foundation pit stability based on the graph mutual driving mechanism according to claim 4 is characterized in that: When the support form adopts cantilever / anchor pull / support type support structure, the overall stability of the foundation pit is judged 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.

7. The method for determining foundation pit stability based on the graph-attribute mutual driving mechanism according to claim 4 is characterized in that: When the support form adopts the 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 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. Where: F s —Calculation coefficient of foundation pit stability; should not be less than 1.20; G1—self-weight of vertical retaining wall outside the pit; G2—hidden support and deadweight; r i —the density of the i-th soil layer; H i —thickness of the i-th soil layer; k pi —Passive earth pressure coefficient of the i-th soil layer; k ai —active earth pressure coefficient of the i-th soil layer; C i —cohesion value of the i-th soil layer; C—standard value of cohesion of soil layer at the base of the wall; B—Wall base width; —Standard value of internal friction angle of soil layer at the wall base.

8. The method for determining foundation pit stability based on graph-attribute mutual driving mechanism according to claim 4 is characterized in that: When the support form 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 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. Where: F s —Calculation coefficient of foundation pit stability; F of foundation pit support structure with safety level of level 1, level 2 and level 3 s They should be no less than 1.25, 1.20, and 1.15 respectively; G—the sum of the deadweight of the double-row piles, the connecting beam on the top of the piles and the soil between the piles; C—standard value of cohesion of soil under the bottom of pile row; —Standard value of internal friction angle of soil under the bottom of pile row; S y — Center distance between double rows of piles; d1—diameter of the front pile; d2—diameter of the rear pile; h i —The height of the i-th soil layer.

9. A foundation pit stability determination system based on a graph-attribute mutual drive mechanism applicable to the method described in any one of claims 1 to 8, characterized in that: It includes parameter management module, graphic attribute mutual drive CAD environment module, 2D and 3D graphic display module, stability judgment module, result output module and statistical query module; The parameter management module is used for dynamic storage, updating, verification and sharing of various foundation pit support form design parameters, foundation pit standard specification index parameters, support material specification model parameters, output attributes and other parameters; The graph-attribute mutual-drive CAD environment module is used to realize the bidirectional linkage update of the graph and attribute information of the foundation pit support elements in the CAD environment, thereby ensuring the consistency of the graph and attribute information; The two-dimensional and three-dimensional graphic display module allows users to overlay the two-dimensional foundation pit design drawing on a commercial electronic map scene such as Baidu, and realize the linkage and interactive display of the two-dimensional and three-dimensional design drawings; The stability determination module is used to dynamically calculate and determine the stability of the foundation pit based on the built-in stability determination mathematical models corresponding to various foundation pit support forms and actual foundation pit design parameters; The achievement output module is used to produce drawings, calculation books and design specifications corresponding to the foundation pit design scheme under the condition that the foundation pit stability requirements are met; The statistical query module is used to query the material category cost details and estimated workload corresponding to the foundation pit design plan.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, which, when executed by a processor, implements all steps of the method for determining foundation pit stability based on the graph-attribute mutual driving mechanism as described in any one of claims 1 to 8.

Images