A pile length calculation method and system based on a geological longitudinal section BIM model

Abstract

This invention discloses a method and system for calculating pile length based on a geological longitudinal profile BIM model, belonging to the field of bridge design information technology. The method includes: acquiring a geological longitudinal profile CAD drawing; extracting line element parameters and geological data from the geological longitudinal profile CAD drawing; and constructing a geological longitudinal profile BIM model based on the geological longitudinal profile BIM model; generating a borehole columnar section BIM model at the mileage station based on the geological longitudinal profile BIM model; and determining the pile length of any target pile location in the borehole columnar section BIM model according to the pile length calculation tool and the expected safety factor. This invention automatically solves for the optimal pile length of the target pile location based on the geological longitudinal profile BIM model, greatly reducing the calculation workload of designers and avoiding human error during repeated pile length adjustments, trial calculations, and result processing.

Description

Technical Field

[0001] This invention relates to the field of information technology for bridge design, and in particular to a method and system for calculating pile length based on a geological longitudinal profile BIM model. Background Technology

[0002] In the process of highway engineering design and construction, bridge design and construction have always held an important position, and the workload of pile foundation design accounts for a very large proportion of the bridge design workload.

[0003] Currently, to improve the accuracy of pile length calculations, geological exploration and design units typically conduct manual measurements of the geological information at the pile locations after each scheme adjustment to obtain longitudinal geological information. This process is prone to human error. Furthermore, each scheme adjustment requires recalculation and adjustment of the pile foundation elevation, pile length, and pile spacing, resulting in a massive workload. Consequently, designers' labor is concentrated on repetitive and error-prone tasks such as repeated pile length adjustments, trial calculations, and result processing. Therefore, there is an urgent need to provide a pile length calculation method that reduces manual involvement in the pile foundation design process, avoids human-introduced errors, and improves bridge design efficiency and the quality of pile foundation construction drawings. Summary of the Invention

[0004] The purpose of this invention is to provide a highly automated and accurate pile length calculation method and system based on a geological longitudinal profile BIM model.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] A method for calculating pile length based on a geological longitudinal profile BIM model includes:

[0007] Step 1: Obtain the geological longitudinal section CAD drawing, which includes CAD line data and geological data;

[0008] Step 2: Extract line element parameters and geological data from the geological longitudinal profile CAD drawing, and construct a geological longitudinal profile BIM model based on the extracted line element parameters and geological data; the geological longitudinal profile BIM model includes line data, table data, and route association data;

[0009] Step 3: Based on the geological longitudinal section BIM model, generate a borehole columnar section BIM model at the specified mileage station.

[0010] Step 4: Based on the borehole columnar section BIM model, determine the pile length of any target pile location in the BIM model according to the pile length calculation tool and the expected value of the safety factor; the pile length calculation tool is used to calculate the pile length of the target pile location based on the geological data of the target pile location, the pile diameter of the pile foundation and the expected value of the safety factor.

[0011] Optionally, the CAD line data includes road design line elements, ground line elements, and geological longitudinal profile line elements.

[0012] Optionally, the geological data includes the permissible bearing capacity of the soil layer, the frictional resistance between the soil layer and the pile side, the distribution sequence of the soil layer, the soil cover height, the permissible bearing capacity of the rock layer, and the standard value of the compressive strength of the rock layer.

[0013] Optionally, step 3 specifically includes:

[0014] The generation methods for the borehole columnar section BIM model at the mileage marker include reading the geological longitudinal section map and entering the table.

[0015] The borehole columnar section BIM model includes mileage station data and stratigraphic distribution information table data.

[0016] Optionally, step 4 specifically includes:

[0017] Determine the estimated pile length of the target pile location; the estimated pile length is the distance from the bottom elevation of any soil layer at the target pile location to the ground line;

[0018] Based on the geological longitudinal section BIM model, the safety factor of the pile foundation at the target pile location is calculated according to the geological data of the target pile location and the estimated pile length.

[0019] When the safety factor of the target pile foundation is greater than the expected value of the safety factor, the estimated pile length is determined to be the target pile length;

[0020] The pile length at the target pile location is corrected using the pile length calculation tool to obtain the optimal pile length.

[0021] Optionally, the step of correcting the pile length at the target pile location using the pile length calculation tool specifically includes:

[0022] Based on the relationship between the pile foundation safety factor corresponding to the target pile length and the expected value of the safety factor, with the goal of the difference between the pile foundation safety factor corresponding to the target pile length and the expected value of the safety factor being within a set range, the pile length of the target pile position is iteratively calculated using the bisection method to obtain the optimal pile length.

[0023] Optionally, after step 3, the following steps are also included:

[0024] Input the optimal pile length, mileage station number, and pile diameter of the target pile location into the pile length calculation tool, and perform a safety factor verification on the optimal pile length of the target pile location.

[0025] This invention also provides a pile length calculation system based on a geological longitudinal profile BIM model, comprising:

[0026] The image acquisition module is used to acquire geological longitudinal profile CAD drawings, which include CAD line data and geological data.

[0027] The parameter extraction module is used to extract line element parameters and geological data from the geological longitudinal profile CAD map, and to construct a geological longitudinal profile BIM model based on the extracted line element parameters and geological data; the geological longitudinal profile BIM model includes line data, table data and route association data;

[0028] The model generation module is used to generate a borehole columnar section BIM model at the mileage station based on the geological longitudinal section BIM model and according to the mileage station.

[0029] The pile length calculation module is used to determine the pile length of any target pile location in the BIM model based on the borehole columnar BIM model, according to the pile length calculation tool and the expected value of the safety factor; the pile length calculation tool is used to calculate the pile length of the target pile location based on the geological data of the target pile location, the pile diameter of the pile foundation and the expected value of the safety factor.

[0030] Optionally, the pile length calculation module specifically includes:

[0031] The pile length estimation unit is used to determine the estimated pile length of the target pile location; the estimated pile length is the distance from the bottom elevation of any soil layer at the target pile location to the ground line.

[0032] The safety factor calculation unit is used to calculate the safety factor of the pile foundation at the target pile location based on the geological data of the target pile location and the estimated pile length.

[0033] The pile length determination unit is used to determine the estimated pile length as the target pile length when the safety factor of the target pile foundation is greater than the expected value of the safety factor;

[0034] The pile length correction unit is used to correct the pile length of the target pile position using the pile length calculation tool to obtain the optimal pile length.

[0035] Optionally, the system further includes:

[0036] The pile length verification module is used to input the optimal pile length, mileage station number, and pile diameter of the target pile location into the pile length calculation tool to verify the safety factor of the optimal pile length of the target pile location.

[0037] According to specific embodiments provided by the present invention, the following technical effects are disclosed: The present invention provides a method and system for calculating pile length based on a geological longitudinal profile BIM model. When calculating pile length, firstly, a geological longitudinal profile CAD drawing is obtained, which includes CAD line data and geological data; then, line element parameters and geological data are extracted from the geological longitudinal profile CAD drawing, and a geological longitudinal profile BIM model is constructed based on the extracted line element parameters and geological data; the geological longitudinal profile BIM model includes map data, table data, and route association data; and based on the geological longitudinal profile BIM model, a borehole columnar section BIM model is generated according to the mileage station; finally, based on the borehole columnar section BIM model, the pile length of any target pile location in the BIM model is determined according to the pile length calculation tool and the expected safety factor; the pile length calculation tool is used to calculate the pile length of the target pile location based on the geological data of the target pile location, the pile diameter of the pile, and the expected safety factor. This invention extracts parameters from the CAD drawing of the geological longitudinal section to form a BIM model of the geological longitudinal section. Based on the BIM model of the geological longitudinal section and the pile length calculation tool, the optimal pile length of the target pile position is automatically solved according to the pile position data of the target pile position. This greatly reduces the calculation workload of the designers and avoids the situation of human error being introduced during repeated pile length adjustments, trial calculations and result processing. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 A flowchart of a pile length calculation method based on a geological longitudinal section BIM model provided in an embodiment of the present invention;

[0040] Figure 2 This is a technical framework diagram of the pile length calculation system based on geological longitudinal profile in an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the geological longitudinal section in an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of the BIM model value assignment window for the geological longitudinal profile in an embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of the visualization window for assigning values ​​to the geological distribution information table in this embodiment of the invention;

[0044] Figure 6 This is a schematic representation of the borehole columnar section BIM model information in an embodiment of the present invention;

[0045] Figure 7 This is a flowchart illustrating the pile length calculation in an embodiment of the present invention;

[0046] Figure 8 This is a flowchart of the pile length verification process in an embodiment of the present invention. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] The purpose of this invention is to provide a highly automated and accurate pile length calculation method and system based on a geological longitudinal profile BIM model.

[0049] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] like Figure 1 As shown, this invention provides a method for calculating pile length based on a geological longitudinal profile BIM model, the method comprising:

[0051] Step 1: Obtain the geological longitudinal section CAD drawing, which includes CAD line data of the geological longitudinal section and geological data.

[0052] Step 2: Extract line element parameters and geological data from the geological longitudinal profile CAD drawing, and construct a geological longitudinal profile BIM model based on the extracted line element parameters and geological data; the geological longitudinal profile BIM model includes line data, table data, and route association data.

[0053] Step 3: Based on the geological longitudinal section BIM model, generate the borehole columnar section BIM model at the mileage station according to the mileage station.

[0054] Step 4: Based on the borehole columnar section BIM model, determine the pile length of any target pile location in the BIM model according to the pile length calculation tool and the expected value of the safety factor; the pile length calculation tool is used to calculate the pile length of the target pile location based on the geological data of the target pile location, the pile diameter of the pile foundation and the expected value of the safety factor.

[0055] Specifically, CAD line data includes road design line elements, ground line elements, and geological longitudinal profile line elements, and these line elements are placed on separate layers.

[0056] Specifically, the geological data includes textual elements describing the geological overview, which list all soil and rock strata information involved in the CAD drawing. The soil strata information includes the allowable bearing capacity of the soil layer, the skin friction between the soil layer and the pile, the distribution sequence of the soil layers, and the soil cover height. The rock strata information includes the allowable bearing capacity of the rock layer and the standard value of the rock layer's compressive strength.

[0057] In some embodiments, line element parameters and geological data are extracted from the geological longitudinal profile CAD drawing, and a geological longitudinal profile BIM model of the geological longitudinal profile CAD drawing is constructed based on the extracted line element parameters and geological data. Specifically, this can be done as follows:

[0058] The system acquires line element parameters and geological data, such as latitudinal PRJ data, and imports them into memory. In this embodiment, a BIM design software is embedded, supporting the import of multiple route data formats and providing a two-dimensional and three-dimensional visualization window to intuitively display the positional relationship between the geological longitudinal line and the entire road design line.

[0059] Obtain CAD drawings of the geological longitudinal profile from a geological exploration and design unit, or according to... Figure 3 Table 1 illustrates the processing of the geological longitudinal section CAD drawing, as shown below:

[0060] Table 1. Explanation of the mapping relationship between geological longitudinal section map content and BIM model.

[0061]

[0062]

[0063] The processed geological longitudinal section CAD drawing dwg file is read into the visualization window of this embodiment of the invention. The drawing information and its corresponding layer are associated in different categories. Clicking "Read" completes the process of assigning CAD line data and geological data to the geological longitudinal section BIM model memory object.

[0064] The specific internal operations of the program are as follows:

[0065] Step 1: Read the dwg file into the computer memory to obtain the memory object of the entire graph.

[0066] DWG file parsing software is used to parse line data from DWG files into memory, forming DWG file memory objects. The object format is determined by the DWG file format. This parsing method is a mature technology and will not be elaborated on here.

[0067] Step 2: Extract the data required for the geological longitudinal profile BIM model from the DWG line elements and text elements based on the layer and element mapping relationship.

[0068] Geological longitudinal profile BIM model is a memory object. Figure 4 One description, the basic data structure is Figure 4 The interface displays information, which internally corresponds to three parts: line data, table data, and route-related information. The line data includes road design lines, ground lines, geological lines, etc. The core technology for assigning values ​​from a DWG file to a BIM model is establishing a mapping relationship between layers and element attributes; therefore, users must... Figure 4 ② This section sets up layer associations; refer to Table 1 above for the mapping table. The most important information table in the BIM model is the geological overview information table (…). Figure 4 (Part ④) and stratigraphic distribution information table ( Figure 5 (Part ①) The geological overview information table is obtained directly from the text primitives in the DWG file, while the stratigraphic distribution information table is selected and assigned values ​​by the user through a drop-down menu provided by the interface. Figure 5 ①The drop-down options in the table are from Figure 4 The information was extracted from the "Soil / Rock Layer Name" column in section ④; in addition, to link it with the overall route BIM model, it also stores the starting station number and elevation value of the road design line, the route it is located on, and the aspect ratio of the graphic, etc. Figure 4 (Part ②) makes it easier to correctly calculate the true location of the map data when calling or displaying the geological longitudinal profile BIM model externally.

[0069] like Figure 5 As shown, the visualization tool is used to specify the names of the upper and lower (or inner and outer) strata of the geological longitudinal profile line, and to complete the process of converting the correlation information of line element parameters and geological data into the geological longitudinal profile BIM model.

[0070] In some embodiments, step 3 may specifically include:

[0071] Determine the estimated pile length of the target pile location; the estimated pile length is the distance from the bottom elevation of any soil layer at the target pile location to the ground line.

[0072] The safety factor of the pile foundation at the target pile location is calculated based on the geological data of the target pile location and the estimated pile length.

[0073] When the safety factor of the target pile foundation is greater than the expected value of the safety factor, the estimated pile length is determined to be the target pile length.

[0074] The pile length at the target pile location is corrected using the pile length calculation tool to obtain the optimal pile length.

[0075] Specifically, such as Figure 7 As shown, the mileage, pile diameter, pile top reaction force, and expected safety factor (expected safety factor value) of the pile location are input into the geological longitudinal profile BIM model. This triggers a calculation command. The pile length calculation tool first takes the distance from the bottom elevation of each soil layer to the bottom line as a set of trial pile lengths. Based on the total number of soil layers (m), m corresponding pile lengths are generated, and the safety factor is calculated for each pile length. When the safety factor of the estimated pile length (the safety factor of the target pile location's foundation) is greater than the expected safety factor threshold, the estimated pile length is determined as the pile length of the target pile location's foundation. Then, the pile length calculation tool is used to correct the pile length of the target pile location to obtain the optimal pile length.

[0076] Specifically, the bearing capacity of the pile length is calculated using Articles 6.3.3 and 6.3.7 of the "Code for Design of Highway Bridge and Culvert Foundations". Appropriate correction factors, bottom cleaning factors, depth correction factors for bearing capacity characteristic values, end resistance utilization factors, and side resistance utilization factors of the overburden soil are selected based on the configuration table in the "Code for Design of Highway Bridge and Culvert Foundations". The calculation formulas are as follows:

[0077]

[0078]

[0079]

[0080]

[0081] Wherein, equation (1-1) is the formula for calculating the bearing capacity of friction piles, equation (2-1) is the formula for calculating the bearing capacity of end-bearing piles, and the safety factor is calculated using equation (3-1), where:

[0082] —Characteristic value of axial compressive bearing capacity of a single pile (kN). The difference between the self-weight of the pile and the weight of the replacement soil (when the self-weight is included in buoyancy, the weight of the replacement soil is also included in buoyancy) is included in the effect.

[0083] —Pile circumference (m) of each soil layer or rock layer.

[0084] —Pile tip cross-sectional area (m²) 2 For expanded-base piles, the area of ​​the expanded-base cross section can be taken.

[0085] —The number of soil layers, and the strongly weathered and completely weathered rock layers are considered as soil layers.

[0086] —The thickness (m) of each soil layer below the bottom surface of the foundation or the local scour line, excluding the enlarged hole section and the 2d length above the variable cross section.

[0087] --and The standard value (kPa) of the skin friction between each soil layer and the pile side should be determined by a single pile skin friction test.

[0088] —The corrected characteristic value of the bearing capacity of the pile tip soil (kPa) should be adopted if the calculated value exceeds the following values ​​when the bearing layer is sand or gravelly soil: silt 1000kPa; fine sand 1150kPa; medium sand, coarse sand, and gravelly sand 1450kPa; gravelly soil 2750kPa.

[0089] —Characteristic value of bearing capacity of soil at pile tip (kPa).

[0090] —The embedment depth of the pile tip (m) is calculated from the local scour line for pile foundations subject to scour; for pile foundations without scour, the embedment depth is calculated from the natural ground line or the ground line after actual excavation. The calculated value should not exceed 40m. If it exceeds 40m, take 40m.

[0091] — Depth correction coefficient for bearing capacity characteristic value.

[0092] —Weighted average unit weight of soil layers above the pile tip (kN / m³) 3 If the bearing layer is below the water level and impermeable, the saturated unit weight should be used; if the bearing layer is permeable, the buoyant unit weight should be used for the submerged portion of the soil.

[0093] —Correction factor.

[0094] —Clearance coefficient.

[0095] —The end resistance utilization coefficient determined based on factors such as rock strength and rock fragmentation.

[0096] —Standard value of saturated uniaxial compressive strength of rock at pile tip (kPa); for clay rock, the standard value of uniaxial compressive strength at natural moisture content is used. When the pressure is less than 2 MPa, it is calculated as a pile supported in the soil layer.

[0097] ——No.i Layer value.

[0098] —The lateral resistance utilization coefficient of the i-th rock layer, determined by factors such as rock strength and rock fragmentation.

[0099] —Thickness (m) of the portion of the pile embedded in each rock layer, excluding the strongly weathered layer, the completely weathered layer, and the bedrock above the local scour line.

[0100] —The number of rock strata, excluding strongly weathered and completely weathered layers.

[0101] —The lateral resistance utilization factor of the overburden soil should be determined based on the pile tip. Sure.

[0102] —Thickness (m) of each soil layer below the bottom surface of the foundation or the local scour line.

[0103] —Pile side i The standard value of the lateral resistance (kPa) of the soil layer should be the value of the single pile skin friction test.

[0104] —The sum of the top reaction force of a single pile foundation (kN), the weight of the moving load above, the self-weight of the beam, the self-weight of the paving guardrail, the self-weight of the cap beam, and the self-weight of the pier.

[0105] —The safety factor for the axial compressive bearing capacity of a single pile is usually taken as 1.2.

[0106] Specifically, the pile length at the target pile location is corrected using a pile length calculation tool to obtain the optimal pile length, as follows:

[0107] Based on the relationship between the pile foundation safety factor corresponding to the target pile length and the expected value of the safety factor, with the goal of the difference between the pile foundation safety factor corresponding to the target pile length and the expected value of the safety factor being within a set range, the pile length of the target pile position is iteratively calculated using the bisection method to obtain the optimal pile length. For example, the set range of the difference between the pile foundation safety factor corresponding to the target pile length and the expected value of the safety factor is 1mm.

[0108] The bisection method iterative calculation process is as follows:

[0109] When the elevation of the i-th soil layer bottom is confirmed, the pile length L i The safety factor F obtained from the trial calculation i Greater than the expected safety factor F a At this point, the binary search iteration begins:

[0110] The first step is to use a temporary variable L. i+1 Record the current pile length L i L i Add half the height of the previous layer, i.e., L. i =L i-1 +(L i -L i-1 ) / 2.

[0111] The second step is to perform an iteration, modifying the L value corrected in the first step. i Substitute into the safety factor calculation formula to calculate F i .

[0112] Third step, compare with F in step two. i and F a The difference, if F i Falling on F a Within the ±e (control accuracy) range, the most suitable pile length L is considered to have been found. i Output; if F i It did not land on F a Within the ±e interval, there are two cases: falling above and falling below.

[0113] Fourth step, when F i >F a This indicates that the most suitable pile length is less than the current L. i , falling in L i-1 To L i Between these steps, return directly to the first step and proceed to the next iteration; if F i <F a This indicates that the optimal pile length is greater than the current L. i , falling in L i To L i+1 Between, at this point it is equivalent to L i and L i-1 All have been corrected (L) i-1 =L i L i =L i+1 ); then the corrected L i-1 and L i The first step of the feedback process leads to the next iteration. Among them, F... i =F a In this case, the iteration stops in the third step and is not involved in the fourth step.

[0114] In some embodiments, after step 3, the method further includes:

[0115] Input the optimal pile length, mileage station number, and pile diameter of the target pile location into the pile length calculation tool, and perform a safety factor verification on the optimal pile length of the target pile location.

[0116] like Figure 8 As shown, the target pile location's mileage, pile length, pile diameter, and pile top reaction force are input into the pile length calculation tool. The tool will retrieve the geological parameters at the pile location from the geological longitudinal profile BIM model. Based on the soil properties of the bearing layer, it will automatically determine whether the pile foundation at the target pile location is a friction pile or an end-bearing pile. It will then verify the bearing capacity of the pile length using Articles 6.3.3 and 6.3.7 of the "Code for Design of Highway Bridge and Culvert Foundations," and output the current pile length safety factor. The verification formula is as follows:

[0117]

[0118]

[0119]

[0120]

[0121] Among them, Equation (4-1) is the formula for calculating the bearing capacity of friction piles, Equation (5-1) is the formula for calculating the bearing capacity of end-bearing piles, and the safety factor is calculated using Equation (6-1).

[0122] —Characteristic value of axial compressive bearing capacity of a single pile (kN). The difference between the self-weight of the pile and the weight of the replacement soil (when the self-weight is included in buoyancy, the weight of the replacement soil is also included in buoyancy) is included in the effect.

[0123] —Pile circumference (m) of each soil layer or rock layer.

[0124] —Pile tip cross-sectional area (m²) 2 For expanded-base piles, the area of ​​the expanded-base cross section can be taken.

[0125] —The number of soil layers, and the strongly weathered and completely weathered rock layers are considered as soil layers.

[0126] —The thickness (m) of each soil layer below the bottom surface of the foundation or the local scour line, excluding the enlarged hole section and the 2d length above the variable cross section.

[0127] --and The standard value (kPa) of the skin friction between each soil layer and the pile side should be determined by a single pile skin friction test.

[0128] —The corrected characteristic value of the bearing capacity of the pile tip soil (kPa) should be adopted if the calculated value exceeds the following values ​​when the bearing layer is sand or gravelly soil: silt 1000kPa; fine sand 1150kPa; medium sand, coarse sand, and gravelly sand 1450kPa; gravelly soil 2750kPa.

[0129] —Characteristic value of bearing capacity of soil at pile tip (kPa).

[0130] —The embedment depth of the pile tip (m) is calculated from the local scour line for pile foundations subject to scour; for pile foundations without scour, the embedment depth is calculated from the natural ground line or the ground line after actual excavation. The calculated value should not exceed 40m. If it exceeds 40m, take 40m.

[0131] — Depth correction coefficient for bearing capacity characteristic value.

[0132] —Weighted average unit weight of soil layers above the pile tip (kN / m³) 3 If the bearing layer is below the water level and impermeable, the saturated unit weight should be used; if the bearing layer is permeable, the buoyant unit weight should be used for the submerged portion of the soil.

[0133] —Correction factor.

[0134] —Clearance coefficient.

[0135] —The end resistance utilization coefficient determined based on factors such as rock strength and rock fragmentation.

[0136] —Standard value of saturated uniaxial compressive strength of rock at pile tip (kPa); for clay rock, the standard value of uniaxial compressive strength at natural moisture content is used. When the pressure is less than 2 MPa, it is calculated as a pile supported in the soil layer.

[0137] —The i-th layer value.

[0138] —The lateral resistance utilization coefficient of the i-th rock layer, determined by factors such as rock strength and rock fragmentation.

[0139] —Thickness (m) of the portion of the pile embedded in each rock layer, excluding the strongly weathered layer, the completely weathered layer, and the bedrock above the local scour line.

[0140] —The number of rock strata, excluding strongly weathered and completely weathered layers.

[0141] —The lateral resistance utilization factor of the overburden soil should be determined based on the pile tip. Sure.

[0142] —Thickness (m) of each soil layer below the bottom surface of the foundation or the local scour line.

[0143] —The standard value (kPa) of the side resistance of the i-th layer of soil on the side of the pile should be the test value of the skin friction of a single pile.

[0144] —The sum of the top reaction force of a single pile foundation (kN), the weight of the moving load above, the self-weight of the beam, the self-weight of the paving guardrail, the self-weight of the cap beam, and the self-weight of the pier.

[0145] —The safety factor for the axial compressive bearing capacity of a single pile is usually taken as 1.2.

[0146] This invention also provides a pile length calculation system based on a geological longitudinal profile BIM model, comprising:

[0147] The image acquisition module is used to acquire geological longitudinal profile CAD drawings, which include CAD line data and geological data.

[0148] The parameter extraction module is used to extract line element parameters and geological data from the geological longitudinal profile CAD map, and to construct a geological longitudinal profile BIM model of the geological longitudinal profile CAD map based on the extracted line element parameters and geological data; the geological longitudinal profile BIM model includes map line data, table data and route association data.

[0149] The model generation module is used to generate a borehole columnar section BIM model at the mileage station based on the geological longitudinal section BIM model and according to the mileage station.

[0150] The pile length calculation module is used to determine the pile length of any target pile location in the BIM model based on the BIM model, according to the pile length calculation tool and the expected value of the safety factor; the pile length calculation tool is used to calculate the pile length of the target pile location based on the geological data of the target pile location, the pile diameter of the pile foundation and the expected value of the safety factor.

[0151] In some embodiments, the pile length calculation module may specifically include:

[0152] The pile length estimation unit is used to determine the estimated pile length of the target pile location; the estimated pile length is the distance from the bottom elevation of any soil layer at the target pile location to the ground line.

[0153] The safety factor calculation unit is used to calculate the safety factor of the pile foundation at the target pile location based on the geological data of the target pile location and the estimated pile length.

[0154] The pile length determination unit is used to determine the estimated pile length as the target pile length when the safety factor of the target pile foundation is greater than the expected threshold of the safety factor.

[0155] The pile length correction unit is used to correct the pile length of the target pile position using the pile length calculation tool to obtain the optimal pile length.

[0156] Specifically, the pile length correction unit may include:

[0157] The pile length correction subunit is used to iteratively calculate the pile length of the target pile position using a bisection method, based on the relationship between the pile foundation safety factor corresponding to the target pile length and the expected value of the safety factor, with the goal that the difference between the pile foundation safety factor corresponding to the target pile length and the expected value of the safety factor is within a set range, to obtain the optimal pile length.

[0158] In some embodiments, the pile length calculation system further includes:

[0159] The pile length verification module is used to input the optimal pile length, mileage station number, and pile diameter of the target pile location into the pile length calculation tool to verify the safety factor of the optimal pile length of the target pile location.

[0160] In summary, the present invention has the following advantages:

[0161] 1) Free designers from repetitive tasks.

[0162] This invention extracts parameters from the CAD drawing of the geological longitudinal section to form a BIM model of the geological longitudinal section, and adds a pile length calculation tool to the geological longitudinal section BIM model. Based on the pile foundation data of the target pile location, the optimal pile length of the target pile location is automatically solved, which greatly reduces the calculation workload of the designers.

[0163] 2) Improve the accuracy of pile length design.

[0164] This invention parameterizes geological longitudinal profile maps using computer technology, effectively shifting the reliance of the original technology on borehole columnar sections to reliance on geological longitudinal profile maps. This reduces the repetitiveness of data entry, improves the accuracy of input parameters, and thus enhances the accuracy of pile length calculations. Simultaneously, the method for generating the borehole columnar section BIM model is compatible with the original algorithm, retaining its simplicity and efficiency.

[0165] 3) Link up with a certain BIM design software to respond to automatic design and batch calculation commands.

[0166] This invention allows users to view the standardized pile length results and corresponding verification results for each station number through a dedicated viewing interface in BIM software. The BIM software can call the entire design function in a loop or in parallel, enabling batch calculations and effectively improving the automation level of pile length design.

[0167] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to the method section.

[0168] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for calculating pile length based on a geological longitudinal profile BIM model, characterized in that, include: Step 1: Obtain the geological longitudinal section CAD drawing, which includes CAD line data and geological data; Step 2: Extract line element parameters and geological data from the geological longitudinal profile CAD drawing, and construct a geological longitudinal profile BIM model based on the extracted line element parameters and geological data; the geological longitudinal profile BIM model includes line data, table data, and route association data; Step 3: Based on the geological longitudinal section BIM model, generate a borehole columnar section BIM model at the specified mileage station. Step 4: Based on the borehole columnar section BIM model, determine the pile length of any target pile location in the BIM model according to the pile length calculation tool and the expected value of the safety factor; the pile length calculation tool is used to calculate the pile length of the target pile location based on the geological data of the target pile location, the pile diameter of the pile foundation, and the expected value of the safety factor. Step 4 specifically includes: Determine the estimated pile length of the target pile location; the estimated pile length is the distance from the bottom elevation of any soil layer at the target pile location to the ground line; Based on the borehole columnar section BIM model, the safety factor of the pile foundation at the target pile location is calculated according to the geological data of the target pile location and the estimated pile length. When the safety factor of the target pile location is greater than the expected value of the safety factor, the estimated pile length is determined to be the target pile length. The pile length at the target pile location is corrected using the pile length calculation tool to obtain the optimal pile length.

2. The pile length calculation method according to claim 1, characterized in that, The CAD line data includes road design line elements, ground line elements, and geological longitudinal profile line elements.

3. The pile length calculation method according to claim 1, characterized in that, The geological data includes the permissible bearing capacity of the soil layer, the frictional resistance between the soil layer and the pile side, the distribution sequence of the soil layer, the soil cover height, the permissible bearing capacity of the rock layer, and the standard value of the compressive strength of the rock layer.

4. The pile length calculation method according to claim 1, characterized in that, Step 3 specifically includes: The generation methods for the borehole columnar section BIM model at the mileage marker include reading the geological longitudinal section map and entering the table. The borehole columnar section BIM model includes mileage station data and stratigraphic distribution information table data.

5. The pile length calculation method according to claim 1, characterized in that, The step of correcting the pile length at the target pile location using the pile length calculation tool specifically includes: Based on the relationship between the pile foundation safety factor corresponding to the target pile length and the expected value of the safety factor, with the goal of the difference between the pile foundation safety factor corresponding to the target pile length and the expected value of the safety factor being within a set range, the pile length of the target pile position is iteratively calculated using the bisection method to obtain the optimal pile length.

6. The pile length calculation method according to claim 1, characterized in that, Following step 3, the following is also included: Input the optimal pile length, mileage station number, and pile diameter of the target pile location into the pile length calculation tool, and perform a safety factor verification on the optimal pile length of the target pile location.

7. A pile length calculation system based on a geological longitudinal profile BIM model, characterized in that, include: The image acquisition module is used to acquire geological longitudinal profile CAD drawings, which include CAD line data and geological data. The parameter extraction module is used to extract line element parameters and geological data from the geological longitudinal profile CAD map, and to construct a geological longitudinal profile BIM model based on the extracted line element parameters and geological data; the geological longitudinal profile BIM model includes line data, table data and route association data; The model generation module is used to generate a borehole columnar section BIM model at the mileage station based on the geological longitudinal section BIM model and according to the mileage station. The pile length calculation module is used to determine the pile length of any target pile location in the BIM model based on the borehole columnar section BIM model, according to the pile length calculation tool and the expected value of the safety factor; the pile length calculation tool is used to calculate the pile length of the target pile location based on the geological data of the target pile location, the pile diameter of the pile foundation and the expected value of the safety factor. The pile length calculation module specifically includes: The pile length estimation unit is used to determine the estimated pile length of the target pile location; the estimated pile length is the distance from the bottom elevation of any soil layer at the target pile location to the ground line. The safety factor calculation unit is used to calculate the safety factor of the pile foundation at the target pile location based on the borehole columnar BIM model, the geological data of the target pile location, and the estimated pile length. The pile length determination unit is used to determine the estimated pile length as the target pile length when the safety factor of the target pile location is greater than the expected value of the safety factor. The pile length correction unit is used to correct the pile length of the target pile position using the pile length calculation tool to obtain the optimal pile length.

8. The pile length calculation system according to claim 7, characterized in that, The system also includes: The pile length verification module is used to input the optimal pile length, mileage station number, and pile diameter of the target pile location into the pile length calculation tool to verify the safety factor of the optimal pile length of the target pile location.

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