A method for arranging a heat absorbing tower pile foundation for a photo-thermal power station

Abstract

This invention relates to the field of pile foundation technology and provides a method for arranging pile foundations for solar thermal power plant absorber towers. The method includes: constructing pile foundation location parameters to characterize the pile foundation arrangement of the absorber tower; constructing a fitness function for pile foundation cost based on the functional relationship between pile foundation cost and pile foundation location parameters; and solving the fitness function using an intelligent optimization algorithm to obtain the pile foundation location parameters that minimize cost. This invention can meet the vertical force requirements of the absorber tower's superstructure and minimize project cost through reasonable pile placement, providing technical support for pile foundation design for absorber towers, a special structure in actual site conditions.

Description

Technical Field

[0001] This invention relates to the field of pile foundation technology, and more specifically, to a method for arranging pile foundations for solar thermal power plant heat absorption towers. Background Technology

[0002] Global warming is a huge challenge facing human development in the future. However, the excessive use of fossil fuels will lead to problems such as environmental pollution and the greenhouse effect. Exploring new energy sources to replace traditional fossil fuels has become a common goal in the field of energy development worldwide.

[0003] Solar energy is characterized by its cleanliness, lack of pollution, vast reserves, and high safety. The effective utilization of renewable energy sources, primarily solar energy, holds promise for mitigating global warming, solving energy problems, and ultimately achieving sustainable human development. Currently, the main methods of solar energy utilization include photovoltaic power generation, concentrated solar power (CSP), photoelectric induction, and photobiological conversion. CSP, also known as concentrated solar power (CSP), has become a major development trend in recent years, facilitating low-cost and large-scale utilization of solar energy. Among these, tower solar thermal power (SPT) boasts high energy conversion efficiency, strong heat storage capacity, and the potential to reduce heat storage and power generation costs, making it the most promising sector for development.

[0004] As a crucial structure in a solar thermal power plant, the heat-absorbing tower is towering, with large-load equipment housed at its top. This necessitates high requirements for foundation strength and deformation control. In adverse geological conditions, pile foundations are often arranged in a circular pattern emanating from the center of the foundation. Due to its height, the bending moment exerted on the foundation by the superstructure is substantial, and the eccentric vertical force plays a decisive role in calculating the pile length. Various pile foundation arrangements exist, resulting in significant differences in bearing capacity and pile length, directly impacting construction costs. Given the large load on the superstructure and the numerous piles, a rational pile foundation arrangement is paramount. However, in actual design, adjustments to the pile foundation scheme often rely on the designer's experience and relevant specifications, leading to slow design speeds and uncertainties in ensuring the rationality of the arrangement. If the pile spacing is too close or the pile length is too long, its placement on the large foundation area of ​​the heat-absorbing tower will significantly increase costs. Therefore, quickly and rationally arranging the pile foundation locations is an urgent need for designers. Summary of the Invention

[0005] The purpose of this invention is to provide a method for arranging the pile foundations of the heat-absorbing towers in solar thermal power plants, so as to improve the above-mentioned problems.

[0006] To achieve the above objectives, the present invention provides a method for arranging pile foundations for solar thermal power plant absorber towers, comprising:

[0007] Construct pile foundation location parameters and use these parameters to characterize the pile foundation layout of the heat absorption tower;

[0008] Based on the functional relationship between pile foundation cost and pile foundation location parameters, a fitness function for pile foundation cost is constructed.

[0009] An intelligent optimization algorithm is used to solve the fitness function to obtain the pile foundation location parameters with the minimum cost.

[0010] Furthermore, the pile foundation location parameters are constructed, including:

[0011] All pile foundations are arranged in a circular pattern from the center of the heat absorption tower foundation outwards, with the center of the heat absorption tower foundation as the origin of the coordinate system. The number of circumferences of all pile foundations is set to k. The pile foundations are evenly arranged on the same circumference. The starting position of each pile foundation on the circumference is located on the x-axis.

[0012] Let the radii of the circles containing all pile foundations from the inside out be respectively... , ... ... , If the value ranges from 1 to k, then in the kth... On a circle The calculation formula is:

[0013] (1)

[0014] Located on the j-th circle, the included angle between two adjacent pile foundations relative to the origin of the coordinate system is... ;

[0015] Pile foundation location parameters include , , ... .

[0016] Furthermore, based on the functional relationship between pile foundation cost and pile foundation location parameters, a fitness function for pile foundation cost is constructed, including:

[0017] Calculations of the vertical force borne by the pile foundation are constructed based on the pile foundation location parameters;

[0018] The pile length is constructed based on the calculated value of the vertical force borne by the pile foundation;

[0019] The cost of pile foundations is calculated based on the pile foundation length.

[0020] Furthermore, based on the pile foundation location parameters, the calculated values ​​of the vertical force borne by the pile foundation are constructed, including:

[0021] The eccentric vertical force borne by the pile foundation on the superstructure of the heat absorption tower plays a decisive role in the calculation of the pile foundation length. The calculated value of the vertical force borne by the pile foundation under the action of the eccentric vertical force is... Should meet , , S represents the standard value of the ultimate vertical bearing capacity of a single pile, and S represents the characteristic value of the vertical bearing capacity of the pile foundation.

[0022] The vertical force is at its maximum when the pile foundation is located on the outermost ring and subjected to eccentric vertical compressive force. The calculated value of the vertical force borne by the pile foundation is defined as follows. The calculation formula is:

[0023] (2)

[0024] In formula (2), F is the vertical force exerted by the superstructure of the heat-absorbing tower on the top of the heat-absorbing tower foundation under the standard combination of load effects; G is the standard value of the self-weight of the heat-absorbing tower foundation and the soil on the heat-absorbing tower foundation; n is the total number of piles. ; and Under the standard combination of load effects, the x and y principal axis moments of the upper structure of the heat absorption tower acting on the bottom surface of the heat absorption tower foundation around the centroid of the pile group; Let the sum of the squares of the distances from all pile foundations to the y-axis and x-axis be set to a radius of 1. Arranged on the circumference Root pile foundation, The calculation formula is:

[0025] (3)

[0026] (4)

[0027] The pile length is constructed based on the calculated vertical force borne by the pile foundation, including:

[0028] Assume all piles have the same length, and take N = 1.2S, where the length of a single pile is... The calculation formula is:

[0029] (5)

[0030] (6)

[0031] In formulas (5) and (6), This represents the standard value of the ultimate lateral resistance of the t-th soil layer along the pile. Let be the length of the pile foundation in the t-th soil layer; This is the standard value of the extreme end resistance; μ is the area of ​​the pile base; μ is the perimeter of the pile foundation.

[0032] The cost of constructing a pile foundation is calculated based on the pile length, including:

[0033] The formula for calculating the cost M of pile foundation is:

[0034] (7)

[0035] In formula (7), p is the comprehensive unit price of pile foundation per unit volume;

[0036] The calculated value of the vertical force borne by the pile foundation obtained from formula (2) is substituted into formulas (5) and (6) to obtain the length of a single pile foundation. Then, the length of a single pile foundation... Substituting into formula (7), we obtain the functional relationship between the pile foundation cost and the pile foundation location parameters; The range of values ​​for k is determined by design specifications and experience. Substitute the value of k into the range of values. ,get , will g( ) is considered as a fitness function.

[0037] Furthermore, before constructing the calculated value of the vertical force borne by the pile foundation based on the pile foundation location parameters, the calculation also includes using finite element analysis software to obtain the force exerted by the heat-absorbing tower on the heat-absorbing tower foundation. The force includes: the vertical force F exerted by the upper structure of the heat-absorbing tower on the top of the heat-absorbing tower foundation under the standard combination of load effects, and the principal axial moments in the x and y directions acting on the bottom surface of the heat-absorbing tower foundation around the centroid of the pile group. , .

[0038] Furthermore, the intelligent optimization algorithm is a particle swarm optimization algorithm, which uses the particle swarm algorithm to optimize the fitness function. Solve the problem to find the minimum value of M. The value.

[0039] The beneficial effects of this invention are as follows:

[0040] This invention provides a method for arranging pile foundations for solar thermal power plant absorber towers. It can design the pile foundation arrangement based on the forces exerted by the superstructure and site conditions. While satisfying the vertical forces exerted by the superstructure on the piles, it minimizes the cost of the pile foundation project and has a fast calculation speed. It solves the problem of pile foundation arrangement for solar thermal power plant absorber towers and provides theoretical basis and technical support for the pile foundation design of this special structure of absorber towers for actual sites. It has strong innovation and practical application value. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a flowchart illustrating the pile foundation layout method proposed in this invention.

[0043] Figure 2 This is a schematic diagram of the pile foundation layout proposed in this invention;

[0044] Figure 3 This is a schematic diagram of the pile foundation location parameters proposed in this invention;

[0045] Figure 4 This is a schematic diagram of the overall structure of the heat absorption tower proposed in this invention;

[0046] Figure 5 The flowchart of the particle swarm optimization algorithm proposed in this invention is shown below;

[0047] Figure 6 This invention presents an iterative process involving five circles.

[0048] Figure 7 This refers to the iterative process of six circles proposed in this invention;

[0049] Figure 8 This invention proposes an iterative process involving seven circles.

[0050] Figure 9 This is a plan view of the optimal layout scheme proposed in this invention. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0052] It should be noted that similar reference numerals or letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0053] Example 1

[0054] like Figure 1As shown in the figure, this embodiment provides a method for arranging pile foundations for solar thermal power plant absorber towers. The method includes:

[0055] S1. Construct pile foundation location parameters and use these parameters to characterize the pile foundation layout of the heat absorption tower;

[0056] S2. Based on the functional relationship between pile foundation cost and pile foundation location parameters, construct a fitness function for pile foundation cost;

[0057] S3. The fitness function is solved by using an intelligent optimization algorithm to obtain the pile foundation location parameters with the minimum cost.

[0058] like Figure 2 As shown, the heat absorption tower structure consists of a tower cylinder, a foundation, and pile foundations from top to bottom. The portion above the pile foundations is considered the superstructure. In S1, the pile foundation location parameters are constructed, including: Figure 3 As shown, all pile foundations are arranged in a circular pattern outward from the center of the heat absorption tower foundation, with the center of the heat absorption tower foundation as the origin of the coordinate system. The number of circumferences of all pile foundations is set to k. The pile foundations are evenly arranged on the same circumference. The starting position of each pile foundation on the circumference is located on the x-axis.

[0059] Let the radii of the circles containing the pile foundations from the inside out be respectively... , ... ... , If the value ranges from 1 to k, then in the kth... On a circle The calculation formula is:

[0060] (1)

[0061] like Figure 3 As shown, the angle formed by two adjacent pile foundations relative to the origin of the coordinate system is set on the j-th circumference. ;

[0062] Pile foundation location parameters include , , ... .

[0063] In S2, the functional relationship between pile foundation cost and pile foundation location parameters includes:

[0064] Calculations of the vertical force borne by the pile foundation are constructed based on the pile foundation location parameters;

[0065] The pile length is constructed based on the calculated value of the vertical force borne by the pile foundation;

[0066] The cost of pile foundations is calculated based on the pile foundation length.

[0067] Specifically, the calculated values ​​of the vertical forces borne by the pile foundation are constructed based on the pile foundation location parameters, including:

[0068] The eccentric vertical force borne by the pile foundation on the superstructure of the heat absorption tower plays a decisive role in the calculation of the pile foundation length. The calculated value of the vertical force borne by the pile foundation under the action of the eccentric vertical force is... Should meet , , S represents the standard value of the ultimate vertical bearing capacity of a single pile, and S represents the characteristic value of the vertical bearing capacity of the pile foundation.

[0069] The calculated value of the vertical force borne by the pile foundation is constructed based on the pile foundation location parameters, including: the calculation formula for the vertical force N borne by the pile foundation is:

[0070] (2)

[0071] In formula (2), F is the vertical force exerted by the upper structure of the heat-absorbing tower on the top of the heat-absorbing tower foundation under the standard combination of load effects; G is the standard value of the self-weight of the heat-absorbing tower foundation and the soil on the heat-absorbing tower foundation; since the number of piles on each circumference can be calculated based on the angle formed by the relative coordinate origins of two adjacent pile foundations on the j-th circumference, and n is the total number of pile foundations, therefore ; and Under the standard combination of load effects, the x and y principal axis moments of the upper structure of the heat absorption tower acting on the bottom surface of the heat absorption tower foundation around the centroid of the pile group are: the vertical force is the largest when the pile foundation is located in the outermost ring and is subjected to eccentric vertical pressure. In order to simplify the calculation and consider the most unfavorable situation, the vertical force N borne by the pile foundation is calculated using formula (2).

[0072] Let the sum of the squares of the distances from all pile foundations to the y-axis and x-axis be set to a radius of 1. Arranged on the circumference Root pile foundation, The calculation formula is:

[0073] (3)

[0074] (4)

[0075] The pile length is constructed based on the calculated vertical force borne by the pile foundation, including:

[0076] Assume all piles have the same length, and take N = 1.2S, where the length of a single pile is... The calculation formula is:

[0077] (5)

[0078] (6)

[0079] In formulas (5) and (6), This represents the standard value of the ultimate lateral resistance of the t-th soil layer along the pile. Let be the length of the pile foundation in the t-th soil layer; This is the standard value of the extreme end resistance; μ is the area of ​​the pile base; μ is the perimeter of the pile foundation.

[0080] The cost of constructing a pile foundation is calculated based on the pile length, including:

[0081] The formula for calculating the cost M of pile foundation is:

[0082] (7)

[0083] In formula (7), p is the comprehensive unit price of pile foundation per unit volume;

[0084] The calculated value of the vertical force borne by the pile foundation obtained from formula (2) is substituted into formulas (5) and (6) to obtain the length of a single pile foundation. Then, the length of a single pile foundation... Substituting into formula (7), we obtain the functional relationship between the pile foundation cost and the pile foundation location parameters; The range of values ​​for k is determined by design specifications and experience. Substitute the value of k into the range of values. ,get , will g( ) is considered as a fitness function.

[0085] Before constructing the calculated value of the vertical force borne by the pile foundation based on the pile foundation location parameters, S0 is also included: the force exerted by the heat absorption tower on the heat absorption tower foundation is calculated using finite element analysis software. The force includes: the vertical force F exerted by the upper structure of the heat absorption tower on the top of the heat absorption tower foundation under the standard combination of load effects, and the principal axial moments in the x and y directions acting on the bottom surface of the heat absorption tower foundation around the centroid of the pile group. , Optional, the finite element analysis software is Midas Gen.

[0086] In S3, the intelligent optimization algorithm is the particle swarm optimization algorithm, which uses the particle swarm optimization algorithm to optimize the fitness function. Solve the problem to find the minimum value of M. The value.

[0087] The following is the implementation process of applying the method of Example 1 to a wind power project:

[0088] 1. The force exerted by the heat absorption tower on the foundation was calculated using finite element analysis software.

[0089] The structure of the heat absorber tower of a solar thermal project was modeled using the finite element analysis software Midas Gen. Figure 4 As shown, the heat absorption tower is 189m high and 25m in diameter at its maximum. The proposed site has a seismic fortification intensity of 6 degrees (0.05g). The site category is Class III, the design seismic group is Group 1, the calculated wind pressure is 0.63kPa, and the standard value of the ultimate lateral resistance of the strata can be obtained from the geological survey report. (kPa), standard value of limit end resistance (kPa), the soil layers below the third layer in the lower part of the site have good geotechnical properties and are good bearing strata for pile ends, making them suitable for drilling and grouting piles. Considering the combined effects of equipment load, wind load, and earthquake, finite element analysis shows that the vertical force F acting on the top of the heat absorber tower foundation is 351095.13 kN, the standard value of the self-weight G of the heat absorber tower foundation and the soil on the foundation is 40405.34 kN, and the bending moment... It is 837670.59 kN·m, which is the x-axis torque of the upper structure of the heat absorption tower acting on the bottom surface of the pile group around the centroid of the pile group.

[0090] 2. The pile foundation location parameters are constructed using method S1, and these parameters are used to characterize the pile foundation arrangement of the heat absorption tower. Since the heat absorption tower is a tall, cylindrical structure, the live loads it experiences include equipment loads, seismic forces, and wind loads, with wind loads being the most significant. The forces in all directions are approximately the same; therefore, the pile foundations are arranged in a circular pattern from the center of the pile cap outwards. Figure 3 As shown.

[0091] In formula (1) The included angle between two adjacent piles is ,according to and The coordinates of the pile foundation can be calculated, in the first quadrant. The pile foundation is, for example Figure 3 The x-coordinate value is cos The vertical axis value is sin Determine the number of piles arranged in a circle. and position parameters This allows for the arrangement of pile foundations for any heat-absorbing tower. The pile foundations on each circumference are arranged counter-clockwise along the circumference, starting from the x-axis.

[0092] 3. Using the S2 method, a fitness function for pile foundation cost is constructed based on the functional relationship between pile foundation cost and pile foundation location parameters. This will not be elaborated further here. The difference lies in considering construction conditions and drilling rig type; the pile diameter is set to 0.8m, and μ = 2.512m. The standard value of the ultimate side resistance of the ground pile can be obtained from the geotechnical engineering investigation report. (kPa), standard value of limit end resistance (kPa), see Table 1.

[0093] Table 1 Soil characteristics of the proposed site

[0094]

[0095] In this embodiment, the comprehensive unit price for pile foundations per unit volume is 1900 yuan / m. 3 The calculation shows that the radius of the pile cap is 19m, calculated based on the upper structure of the heat absorption tower. According to the "Technical Code for Building Pile Foundations" (JGJ 94-2008), the distance from the center of the edge pile to the edge of the pile cap should not be less than the pile diameter, and the distance from the outer edge of the pile to the edge of the pile cap should not be less than 150mm. Considering the construction conditions and drilling rig model, the pile diameter is set at 0.8m. To fully utilize the bottom area of ​​the pile cap for pile placement, the distance from the center of the edge pile to the edge of the pile cap is considered based on a pile diameter of 0.8m. =18.2m, based on the pile spacing in the "Technical Code for Building Pile Foundations" and practical experience, k=5, 6, 7 are set, and the determined... , Substitution ,get ,Will It is solved as a fitness function.

[0096] 4. Using the S3 method, an intelligent optimization algorithm is employed to solve the fitness function, thereby obtaining the pile foundation location parameters that minimize the cost.

[0097] The relationship between pile foundation cost and pile foundation location parameters is complex, and there are many decision variables. Traditional mathematical methods require many constraints to be met and cannot provide accurate and fast solutions.

[0098] Particle swarm optimization (PSO) is an intelligent optimization algorithm that originates from the study of bird flock foraging behavior. It assumes an n-dimensional space with m particles, and defines the optimization variables... Defined as particles, each particle's position and velocity can be expressed as a vector. The velocity and position of each particle are adjusted using velocity and position update formulas until the optimal solution is found. See the algorithm flowchart below. Figure 5 .

[0099] The fitness function in this paper is multidimensional and complex, and is solved using a particle swarm optimization algorithm. The number of particles is set to 500, and the number of iterations is 20. This embodiment calculates the optimal pile foundation location when the number of circular circumferences is k=5, 6, and 7, respectively, thus obtaining the optimal location under the action of the superstructure on the vertical force of the piles. Figure 2 As shown, the cylinders and frustums on the pile foundation constitute the superstructure. When the pile foundation cost M reaches its minimum value, ~ The values ​​were used to complete the pile foundation layout. The calculation results are shown in Table 2, and the iterative convergence process is shown in [Table 2]. Figure 6-8 .

[0100] It can be seen that when the number of piles arranged in a circle is 7, the cost of the pile foundation is the lowest, at 4,544,705 yuan. The pile foundation location parameters for this scheme are: =90°, =60°, =18° =13.33°, =10.59°, =8.78°, see the floor plan. Figure 9 .

[0101] Table 2 Comparison of Layout Scheme Results

[0102]

[0103] To verify the feasibility of the pile foundation layout scheme, PKPM was used to model the pile foundation of the scheme. The characteristic values ​​of vertical compressive bearing capacity, vertical tensile bearing capacity, and horizontal bearing capacity were calculated and verified. All of them meet the requirements of the "Code for Design of Building Pile Foundations" (JGJ 94-2008) and can be applied to actual projects.

[0104] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.

[0105] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for arranging pile foundations for solar thermal power plant absorber towers, characterized in that, include: Construct pile foundation location parameters and use these parameters to characterize the pile foundation layout of the heat absorption tower; Based on the functional relationship between pile foundation cost and pile foundation location parameters, a fitness function for pile foundation cost is constructed. The fitness function is solved using an intelligent optimization algorithm to obtain the pile foundation location parameters with the minimum cost. Construct the pile foundation location parameters, including: All pile foundations are arranged in a circular pattern from the center of the heat absorption tower foundation outwards, with the center of the heat absorption tower foundation as the origin of the coordinate system. The number of circumferences of all pile foundations is set to k. The pile foundations are evenly arranged on the same circumference. The starting position of each pile foundation on the circumference is located on the x-axis. Let the radii of the circles containing all pile foundations from the inside out be respectively... , ... ... , If the value ranges from 1 to k, then in the kth... On a circle The calculation formula is: （1） Located on the j-th circle, the included angle between two adjacent pile foundations relative to the origin of the coordinate system is... ; Pile foundation location parameters include , , ... ; Based on the functional relationship between pile foundation cost and pile foundation location parameters, a fitness function for pile foundation cost is constructed, including: Calculations of the vertical force borne by the pile foundation are constructed based on the pile foundation location parameters; The pile length is constructed based on the calculated value of the vertical force borne by the pile foundation; Calculate the cost of pile foundations based on pile foundation length; The calculated values ​​of the vertical force borne by the pile foundation are constructed based on the pile foundation location parameters, including: The eccentric vertical force borne by the pile foundation on the superstructure of the heat absorption tower plays a decisive role in the calculation of the pile foundation length. The calculated value of the vertical force borne by the pile foundation under the action of the eccentric vertical force is... Should meet , , S represents the standard value of the ultimate vertical bearing capacity of a single pile, and S represents the characteristic value of the vertical bearing capacity of the pile foundation. The vertical force is at its maximum when the pile foundation is located on the outermost ring and subjected to eccentric vertical compressive force. The calculated value of the vertical force borne by the pile foundation is defined as follows. The calculation formula is: （2） In formula (2), F is the vertical force exerted by the superstructure of the heat-absorbing tower on the top of the heat-absorbing tower foundation under the standard combination of load effects; G is the standard value of the self-weight of the heat-absorbing tower foundation and the soil on the heat-absorbing tower foundation; n is the total number of piles. ; and Under the standard combination of load effects, the x and y principal axis moments of the upper structure of the heat absorption tower acting on the bottom surface of the heat absorption tower foundation around the centroid of the pile group; , Let the sum of the squares of the distances from all pile foundations to the y-axis and x-axis be set to a radius of 1. Arranged on the circumference Root pile foundation, , The calculation formula is: （3） （4） The pile length is constructed based on the calculated vertical force borne by the pile foundation, including: Assume all piles have the same length, and take N = 1.2S, where the length of a single pile is... The calculation formula is: （5） （6） In formulas (5) and (6), This represents the standard value of the ultimate lateral resistance of the t-th soil layer along the pile. Let be the length of the pile foundation in the t-th soil layer; This is the standard value of the extreme end resistance; μ is the area of ​​the pile base; μ is the perimeter of the pile foundation. The cost of constructing a pile foundation is calculated based on the pile length, including: The formula for calculating the cost M of pile foundation is: （7） In formula (7), p is the comprehensive unit price of pile foundation per unit volume; The calculated value of the vertical force borne by the pile foundation obtained from formula (2) is substituted into formulas (5) and (6) to obtain the length of a single pile foundation. Then, the length of a single pile foundation... Substituting into formula (7), we obtain the functional relationship between the pile foundation cost and the pile foundation location parameters; The range of values ​​for k is determined by design specifications and experience. Substitute the value of k into the range of values. ,get , will g( ) is considered as a fitness function.

2. The method for arranging pile foundations for solar thermal power plant absorber towers according to claim 1, characterized in that, Before constructing the calculated value of the vertical force borne by the pile foundation based on the pile foundation location parameters, the calculation of the force exerted by the heat absorption tower on the heat absorption tower foundation is also included using finite element analysis software. The force includes: the vertical force F exerted by the upper structure of the heat absorption tower on the top of the heat absorption tower foundation under the standard combination of load effects, and the principal axial moments in the x and y directions acting on the bottom surface of the heat absorption tower foundation around the centroid of the pile group. , .

3. The method for arranging pile foundations for solar thermal power plant absorber towers according to claim 1, characterized in that, The intelligent optimization algorithm is the particle swarm optimization algorithm, which uses the particle swarm algorithm to optimize the fitness function. Solve the problem to find the minimum value of M. The value.

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