Stability analysis method of dam simulation test platform under combined action of multiple loads

Abstract

The present application relates to a dam simulation test platform stability analysis method under the combined action of multiple loads, comprising: modeling the steel cable used for the test platform binding fixation, analyzing the stress-strain of the steel cable; obtaining the stability boundary conditions of the structural members of the dam simulation test platform through analysis; analyzing the stability of the structural members of the test platform under large temperature difference conditions; analyzing the stability of the dam simulation test platform under the action of wind load; analyzing the load of the dam simulation test platform under the impact of sediment flow; analyzing the stress-strain of the dam simulation test platform under the combined load, and judging the stability of the dam simulation test platform. The present application calculates the sediment flow impact, wind load and snow load of the dam simulation test platform, analyzes the stress field and strain distribution of the dam simulation test platform under the combined load, judges the stability of the dam simulation test platform, and ensures the structural safety and stability of the test platform under extreme weather conditions.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of water and electricity engineering monitoring, and particularly relates to a dam simulation test platform stability analysis method under combined action of multiple loads. BACKGROUND

[0002] With the vigorous development of dam construction of water conservancy and hydropower engineering in China, dam construction technology has become increasingly mature and perfect. Not only has it accumulated valuable experience for the construction of subsequent similar projects, but also has formed a batch of universal and applicable technology which can provide strong guidance for the construction of new projects. However, due to the vast territory of China, there are significant differences in dam type, climate, geology and dam materials in different regions. Changes in water conservancy and hydropower engineering construction conditions will also cause differences in engineering technical parameters and indexes. Therefore, it is necessary to carry out targeted test research before the project starts and during the construction process to explore suitable materials, equipment and technical solutions that meet the needs of the project in all aspects.

[0003] However, due to the limitations of indoor test in environmental simulation, instrument equipment and size, it is impossible to fully reproduce the complex and changeable climate conditions and working conditions of the engineering site. Therefore, it is necessary to transfer the test site to the engineering site in order to more accurately simulate and solve actual problems.

[0004] The environment of water conservancy engineering site is extremely complex, especially in the northwest region, the climate condition is severe, facing severe cold, great temperature difference, strong wind, rainstorm and blizzard, etc. At the same time, severe weather may also cause secondary disasters such as floods and mudslides. In order to carry out effective field test in such environment, it is necessary to first build a scientific research test platform with comprehensive functions which can carry multiple instrument equipment. This test platform not only needs to have strong scientific research experiment function, but also must have enough structural strength to resist the single or combined action of wind, snow, earthquake and other external loads.

[0005] Designing such a test platform is a very challenging task. The test platform needs enough space to accommodate various instrument equipment to realize multiple scientific research functions; at the same time, it must ensure the firmness and durability of the test platform to ensure the structural safety and stability of the test platform.

[0006] Therefore, it is necessary to carry out comprehensive load analysis at the initial stage of test platform design. Through the analysis results, necessary adjustment and optimization are carried out on its structure to ensure that the platform can not only bear its own weight, but also effectively resist the adverse effects of external combined load. SUMMARY

[0007] The purpose of the present application is to solve the above problems, provide a dam simulation test platform stability analysis method under the action of multiple load combinations, analyze the stability boundary conditions of the test platform skeleton structure, and further analyze the stability of the test platform skeleton structure under the condition of large temperature difference, respectively calculate the sand flow impact load, wind load and snow load of the dam simulation test platform, and analyze the stability of the dam simulation test platform under the action of combined load; considering the binding and fixing effect of the steel cable on the dam simulation test platform, modeling and analyzing the stress-strain of the dam simulation test platform under the action of combined load by using finite element analysis software, determining the anchoring point of the steel cable and the parameters and quantity of the steel cable, and enhancing the structural stability of the dam simulation test platform.

[0008] The technical scheme of the present application is a dam simulation test platform stability analysis method under the action of multiple load combinations, comprising the following steps:

[0009] S1, modeling the steel cable for binding and fixing of the dam simulation test platform, measuring and calculating the elastic modulus of the steel cable, and analyzing the stress-strain of the steel cable;

[0010] S2, decomposing the dam simulation test platform into structural members according to its skeleton structure, and analyzing the stability boundary conditions of the structural members of the dam simulation test platform;

[0011] S201, constructing the motion differential equation of the structural members of the dam simulation test platform under random load;

[0012] S202, determining the random stability boundary conditions of the structural members of the dam simulation test platform;

[0013] S3, analyzing the stability of the structural members of the dam simulation test platform under the condition of large temperature difference;

[0014] S4, analyzing the stability of the dam simulation test platform under the action of wind load;

[0015] S401, performing wind tunnel test on the dam simulation test platform using the equal ratio test model, and obtaining the wind load of the structural members at different positions of the dam simulation test platform;

[0016] S402, according to the stability boundary conditions of the structural members, analyzing and judging the stability of the structural members at different positions of the dam simulation test platform under the action of wind load;

[0017] S5, load analysis of the dam simulation test platform under the action of sand flow impact;

[0018] S501, calculating the sand flow liquid phase impact force of the dam simulation test platform;

[0019] S502, calculating the displacement of the dam simulation test platform under the action of sand flow;

[0020] S6, calculate the combined load of the sediment flow, wind load and snow load, analyze the stress-strain of the dam simulation test platform with the steel cable bound fixed under the combined load by using the finite element software, judge the stability of the dam simulation test platform; according to the stress field and strain distribution of the dam simulation test platform under the combined load, adjust the parameters and quantity of the steel cable and the anchoring point of the steel cable on the dam simulation test platform, and enhance the stability of the dam simulation test platform.

[0021] Preferably, in step S1, the elastic modulus of the steel cable is measured by an elastic modulus measurement experiment E ;

[0022] Further, the steel cable comprises a center cable and N outer spiral steel cables.

[0023] The axial force of the outer spiral steel cable in the tensile state is:

[0024]

[0025] In the formula represents the axial force component of the outer spiral steel cable, is the winding angle of the outer spiral steel cable after the tensile deformation of the steel cable, A is the cross-sectional area of the outer spiral steel cable, is the length of the outer spiral steel cable after stretching, is the original length of the outer spiral steel cable under the action of no force.

[0026] The axial force of the center cable in the tensile state is:

[0027]

[0028] In the formula represents the axial force of the center cable, , respectively represent the lengths of the center cable before and after stretching.

[0029] The axial force of the steel cable is :

[0030]

[0031] In the formula N is the number of outer spiral steel cables.

[0032] Further, in step S201, the structural members of the dam simulation test platform vibrate under any load, and the motion differential equation of the structural members under the load is:

[0033]

[0034] wherein, T denotes the time of the load action process, denotes the n sub-modal response function of the structural member; denotes the first and second derivatives of the is the mass of the structural member; c is the damping force generated by the external damping; is the n order vibration frequency of the structural member under the external average load; denotes the n excitation coefficient corresponding to the order mode;

[0035] Further, in step S202, the random stable boundary condition of the structural member is:

[0036]

[0037] wherein is the stable boundary function of the structural member of the dam simulation test platform; is the constant pi; is the external average load; is the n Euler buckling load of the structural member under the static uniform axial pressure; EI is the bending stiffness of the structural member; is the mass of the structural member; L is the length of the structural member; is the n order vibration frequency of the structural member under the external average load; is the cosine power spectral density function.

[0038] Further, in step S3, the calculation formula of the temperature load caused by large temperature difference is:

[0039] T l = CTE *Δ T * E (6)

[0040] wherein T l is the temperature load of the structural member of the dam simulation test platform, CTE is the linear expansion coefficient, Δ T is the temperature change amount, E is the elastic modulus of the structural member.

[0041] Further, in step S501, the calculation formula of the liquid phase impact force of the sediment flow is:

[0042]

[0043] wherein is the impact pressure of the sediment flow on the dam simulation test platform, is the bulk density of the sediment flow, is the flow velocity of the sediment flow, g is the acceleration of gravity, α is the angle between the impact direction of the sediment flow and the impact surface of the dam simulation test platform, λ is the shape coefficient of the dam simulation test platform.

[0044] Further, in step S502, the motion equation of the impact surface of the dam simulation test platform is:

[0045]

[0046] wherein is the displacement of the impact surface of the dam simulation test platform, t denotes time, x denotes the position of the impact surface of the dam simulation test platform in the lateral direction; is the density of the surface layer material of the dam simulation test platform; is the thickness of the surface layer of the dam simulation test platform; is the linear damping coefficient; denotes the bending stiffness, denotes the position x at which the impact load is received.

[0047] Preferably, in step S6, the calculation formula of the snow load is:

[0048]

[0049] wherein is the snow load value; is the snow distribution coefficient; denotes the snow pressure.

[0050] Preferably, when the sediment flow, the wind load and the snow load act together, the calculation and analysis are performed according to the following formula:

[0051]

[0052] wherein, F is the total force received by the force receiving surface of the dam simulation test platform; is the angle between the wind direction of the wind load and the force receiving surface of the dam simulation test platform; an angle between a force of the snow load and the dam simulation test platform; an angle between a direction of the mud flow impacting the dam simulation test platform and an impacted surface of the dam simulation test platform; a wind load value on a surface of the dam simulation test platform; a snow load value on the surface of the dam simulation test platform; an impact pressure of the mud flow on the dam simulation test platform.

[0053] Further, a calculation formula of the wind load is:

[0054]

[0055] wherein a wind load perpendicular to the surface of the dam simulation test platform, a wind vibration coefficient, z a height, a wind load shape coefficient, a basic wind pressure value, a wind pressure height variation coefficient.

[0056] Preferably, a calculation formula of the impact force of the moving large stone on the dam simulation test platform is:

[0057]

[0058] wherein an impact force of the moving large stone on the dam simulation test platform, an elastic modulus of the large stone, J a moment of inertia of the large stone, L a length of an impacted surface of the dam simulation test platform; V a moving speed of the large stone; W a weight of the stone; g a gravity acceleration; an angle between a moving direction of the stone and the impacted surface when the stone impacts the dam simulation test platform.

[0059] a maximum value of the moving speed of the large stone rolling on the dam slope is calculated according to a height of the dam slope, V a maximum value of the impact force of the moving large stone on the dam simulation test platform is further calculated, and a damage influence of the impact force on the impacted surface of the dam simulation test platform and a skeleton structure thereof is analyzed.

[0060] Compared with the prior art, the present application has the following beneficial effects:

[0061] 1) The present application calculates the sediment flow impact, wind load and snow load of the dam simulation test platform, and further analyzes the stress field and strain distribution of the dam simulation test platform under the combined load by using finite element software, judges the stability of the dam simulation test platform, ensures the structural safety and stability of the dam simulation test platform under extreme meteorological conditions, can adapt to the severe weather conditions of the hydropower engineering site in the west, and ensures the smooth development of scientific tests in the construction of hydropower engineering.

[0062] 2) The present application analyzes and calculates the temperature load caused by large temperature difference of hydropower engineering construction site, which is convenient for the case of large temperature difference between day and night and cold wave attack of hydropower engineering site in the west, enhances the structural strength design of the skeleton of the dam simulation test platform, and further ensures the safety and stability of the dam simulation test platform under extreme meteorological conditions.

[0063] 3) The present application analyzes and calculates the wind load under strong wind condition of hydropower engineering construction site and the influence of wind load on the skeleton of the dam simulation test platform, enhances the ability of the skeleton of the dam simulation test platform to withstand strong wind, so that the dam simulation test platform can adapt to the strong wind and sand environment of the hydropower engineering site in the west.

[0064] 4) The present application decomposes the skeleton of the dam simulation test platform into basic structural members, constructs the motion differential equation of the structural members under random load, determines the stable boundary condition of the structural members, and provides a scientific basis for analyzing and judging the structural safety and stability of the skeleton of the dam simulation test platform.

[0065] 5) The present application calculates the impact force of the stone rolling on the dam simulation test platform, analyzes the damage effect of the stone on the surface and skeleton structure of the dam simulation test platform, and further improves the structural reliability of the dam simulation test platform.

[0066] 6) The present application models the steel cable used for binding and fixing the dam simulation test platform, calculates the elastic modulus of the steel cable, analyzes the stress-strain of the steel cable, and determines the anchoring point of the steel cable and the parameters and quantity of the steel cable in combination with the stress field and strain distribution calculation results of the dam simulation test platform under combined load, which further enhances the structural stability of the dam simulation test platform. BRIEF DESCRIPTION OF DRAWINGS

[0067] The present application will be further described below in combination with the drawings and examples.

[0068] Figure 1 The present application is a schematic diagram of the dam simulation test platform stability analysis method of the embodiment.

[0069] Figure 2 The present application is a skeleton structure diagram of the dam simulation test platform of the embodiment.

[0070] Figure 3 This is a diagram showing the unit load distribution of the dam simulation test platform under a certain load combination, according to an embodiment of the present invention. Detailed Implementation

[0071] like Figure 1 As shown, the stability analysis method for a dam simulation test platform under multiple load combinations includes:

[0072] S1. Model the steel cable used for tying and fixing in the dam simulation test platform, measure and calculate the elastic modulus of the steel cable, and analyze the stress-strain of the steel cable.

[0073] The elastic modulus of the steel cable was measured using an elastic modulus measurement experiment. E .

[0074] In this embodiment, the steel cable comprises a central steel cable and N outer helical steel cables.

[0075] The axial force of the outer helical cable under tension is:

[0076] (1)

[0077] In the formula This represents the axial force component of the outer helical cable. This refers to the twist angle of the outer spiral steel cable after the steel cable has been stretched and deformed. A This represents the cross-sectional area of ​​the outer spiral steel cable. This refers to the length of the stretched outer spiral steel cable. This is the original length of the outer spiral steel cable when it is not subjected to any force.

[0078] The axial force of the central cable under tension is:

[0079] (2)

[0080] In the formula This indicates the axial force in the central steel cable. , These represent the lengths of the central steel cable before and after tensioning, respectively.

[0081] The axial force of the steel cable for:

[0082] (3)

[0083] In the formula N This refers to the number of outer spiral steel cables.

[0084] S2, the dam simulation test platform is decomposed into structural members according to its skeleton structure, and stable boundary conditions of the structural members of the dam simulation test platform are analyzed, wherein the skeleton structure of the dam simulation test platform is as shown in Figure 2

[0085] S201, a motion differential equation of the structural members of the dam simulation test platform under random load is constructed.

[0086] The structural members of the dam simulation test platform vibrate under any load, and the motion differential equation of the structural members under the load is:

[0087] (4)

[0088] In the formula, T represents the time of the load action process, represents the n second modal response function of the structural member; respectively represent the first and second derivatives of ; and is the mass of the structural member; c is the damping force generated by the external damping; is the n order vibration frequency of the structural member under the external average load; represents the excitation coefficient corresponding to the n order mode; is the difference function of the random load and the average load on the structural member.

[0089] S202, the random stable boundary condition of the structural members of the dam simulation test platform is determined.

[0090] The random stable boundary condition of the structural members is:

[0091] (5)

[0092] In the formula, is the stable boundary function of the structural members of the dam simulation test platform; is the circular constant; is the external average load; is the n order Euler buckling load of the structural member under the static uniform axial pressure; EI is the bending stiffness of the structural member; is the mass of the structural member; L is the length of the structural member; is the n order vibration frequency of the structural member under the external average load; is the cosine power spectral density function. ​

[0093] S3, analyze the stability of the structural members of the dam simulation test platform under large temperature difference conditions;

[0094] The calculation formula of the temperature load caused by large temperature difference is:

[0095] T l CTE ×Δ T × E (6)

[0096] wherein T l is the temperature load of the structural members of the dam simulation test platform, CTE is the linear expansion coefficient, Δ T is the temperature change, E is the elastic modulus of the structural members.

[0097] S4, analyze the stability of the dam simulation test platform under wind load;

[0098] S401, perform wind tunnel test on the dam simulation test platform using the equal ratio test model to obtain the wind load of the structural members at different positions of the dam simulation test platform;

[0099] S402, analyze and determine the stability of the structural members at different positions of the dam simulation test platform under wind load according to the stability boundary conditions of the structural members.

[0100] S5, perform load analysis on the dam simulation test platform under the impact of sediment flow;

[0101] S501, calculate the liquid phase impact force of the sediment flow on the dam simulation test platform;

[0102] The calculation formula of the liquid phase impact force of the sediment flow is:

[0103] (7)

[0104] wherein is the impact pressure of the sediment flow on the dam simulation test platform, is the bulk density of the sediment flow, is the flow velocity of the sediment flow, g is the acceleration of gravity, α is the angle between the impact direction of the sediment flow and the impacted surface of the dam simulation test platform, λ is the shape coefficient of the dam simulation test platform.

[0105] S502, calculate the displacement of the dam simulation test platform under the action of the sediment flow;

[0106] ​The motion equation of the impact surface of the dam simulation test platform is:

[0107] (8)

[0108] In the formula, is the displacement of the impact surface of the dam simulation test platform, t represents time, x represents the position of the impact surface of the dam simulation test platform in the transverse direction; is the density of the material; is the thickness of the surface of the dam simulation test platform; c d is a linear damping coefficient; is the bending stiffness, wherein is the elastic modulus, is the sectional moment of inertia, for a plate structure, is a value related to the thickness and width of the plate; represents the impact load received at the position x .

[0109] S6, the combined load of the sediment flow, wind load and snow load is calculated, the stress-strain of the dam simulation test platform with the steel cable bound fixed under the combined load is analyzed by using the finite element software, and the stability of the dam simulation test platform is judged; according to the stress field and strain distribution of the dam simulation test platform under the combined load, the parameters and quantity of the steel cable and the anchoring point of the steel cable on the dam simulation test platform are adjusted, and the stability of the dam simulation test platform is enhanced.

[0110] The calculation formula of the snow load is:

[0111] (9)

[0112] In the formula, is the snow load value; is the snow distribution coefficient; represents the snow pressure.

[0113] The calculation formula of the wind load is:

[0114] (10)

[0115] In the formula, represents the wind load perpendicular to the surface of the dam simulation test platform, is the wind vibration coefficient, z represents the height, is the wind load shape coefficient, is the basic wind pressure value, represents the wind pressure height variation coefficient.

[0116] The total force on the stress surface of the dam simulation test platform is calculated and analyzed according to the following formula when the sediment flow, wind load and snow load act together:

[0117] (11)

[0118] In the formula, F is the total force on the stress surface of the dam simulation test platform; is the angle between the wind direction of the wind load and the stress surface of the dam simulation test platform; represents the angle between the snow load force and the dam simulation test platform; represents the angle between the impact direction of the debris flow on the dam simulation test platform and the impact surface of the dam simulation test platform; represents the wind load value on the surface of the dam simulation test platform; represents the snow load value on the surface of the dam simulation test platform; represents the impact pressure of the debris flow on the dam simulation test platform.

[0119] In the embodiment, the Midas finite element software is used to establish the finite element model of the dam simulation test platform. The finite element model of the dam simulation test platform includes the surface layer of the dam simulation test platform and the structural members constituting the framework structure. The material selection and structural parameters of the surface layer of the dam simulation test platform and the framework structure are set in the finite element model. The elements and nodes of the finite element model of the dam simulation test platform are divided. The wind load, snow load and debris flow impact load are calculated according to different combinations for the top surface and the front, back, left and right four surfaces of the dam simulation test platform. Then the combined load is added to the corresponding elements and nodes of the finite element model, so as to obtain the stress field and strain distribution of the dam simulation test platform under the action of different combined loads.

[0120] The load value distribution of the dam simulation test platform under certain combination in the embodiment is shown in Figure 3 , wherein the load value of the red part is 10 kN / m 2 ; the load value of the orange part is 2 kN / m 2 ; the load value of the yellow part is 2.5 kN / m 2 ; the load value of the light green part is 0.5 kN / m 2 ; and the load value of the green part is 5 kN / m 2 .

[0121] The stress field and strain distribution of the dam simulation test platform under different combined loads were obtained using Midas finite element software. Based on the stress-strain analysis results of the dam simulation test platform under different combined loads, the structural parameters of the surface and frame of the dam simulation test platform were adjusted. The number of steel cables used for binding and fixing the dam simulation test platform and the anchoring points on the dam simulation test platform were determined so that the dam simulation test platform meets the design requirements for structural safety.

[0122] In another embodiment of the present invention, the impact of moving large boulders, such as large rocks rolling down a slope at a hydropower project site, on the dam simulation test platform is considered. The formula for calculating the impact force of the moving large boulders on the dam simulation test platform is:

[0123] (12)

[0124] In the formula This represents the impact force of the moving boulder on the dam simulation test platform. This represents the elastic modulus of a large rock. J The moment of inertia of the large stone is represented by its rotation. L The length of the impact surface of the dam simulation test platform; V The speed of the stone's movement; W The weight of the stone; g It is the acceleration due to gravity; The angle between the direction of motion of the rock and the force-bearing surface when the rock impacts the dam simulation test platform.

[0125] In the embodiment, in equation (11) Replace with The stress-strain of a dam simulation test platform under the combined action of large rock impact load, wind load, and snow load was analyzed to determine whether the dam simulation test platform meets the design requirements for safety and stability.

Claims

1. A method for stability analysis of a dam simulation test platform under combined action of multiple loads, characterized in that, The method comprises the following steps: S1, modeling the steel cable fixed on a dam simulation test platform, measuring and calculating the elastic modulus of the steel cable, and analyzing the stress-strain of the steel cable; S2, decomposing the dam simulation test platform into structural members according to its skeleton structure, and analyzing to obtain the stable boundary conditions of the structural members of the dam simulation test platform; S201, constructing the motion differential equation of the structural members of the dam simulation test platform under random load; S202, determining the random stable boundary conditions of the structural members of the dam simulation test platform; S3, analyzing the stability of the structural members of the dam simulation test platform under large temperature difference; S4, analyzing the stability of the dam simulation test platform under wind load; S401, performing wind tunnel test on the dam simulation test platform by using the equal ratio test model of the dam simulation test platform, and obtaining the wind load of the structural members at different positions of the dam simulation test platform; S402, according to the stable boundary conditions of the structural members, analyzing and judging the stability of the structural members at different positions of the dam simulation test platform under wind load; S5, load analysis of the dam simulation test platform under the impact of sediment flow; S501, calculating the impact force of the sediment flow liquid phase on the dam simulation test platform; S502, calculating the displacement of the dam simulation test platform under the action of sediment flow; S6, calculating the combined load of sediment flow, wind load and snow load, analyzing the stress-strain of the steel cable fixed dam simulation test platform under the combined load by using finite element software, and judging the stability of the dam simulation test platform.

2. The dam simulation test platform stability analysis method of claim 1, wherein, The step S6 further comprises: according to the stress field and strain distribution of the dam simulation test platform under the combined load, adjusting the parameters and quantity of the steel cable and the anchoring point of the steel cable on the dam simulation test platform, and enhancing the stability of the dam simulation test platform.

3. The dam simulation test platform stability analysis method of claim 1, wherein, In step S1, the elastic modulus of the steel cable is measured by an elastic modulus measurement experiment E ; The steel cable comprises a center cable and N outer spiral steel cables, The axial force of the outer spiral steel cable in the tensile state is: (1) wherein F represents the axial force component of the outer spiral steel cable, is the winding angle of the outer spiral steel cable after the tensile deformation of the steel cable, A is the cross-sectional area of the outer spiral steel cable, is the length of the outer spiral steel cable after the tensile deformation, is the original length of the outer spiral steel cable under no force action. The axial force of the center cable in the tensile state is: (2) In the formula denotes the axial force of the central cable, , respectively denote the length of the central cable before and after stretching. The axial force of the steel cable Is: (3) In the formula N is the number of outer spiral steel cords.

4. The dam simulation test platform stability analysis method of claim 1, wherein, In step S201, the structural members of the dam simulation test platform vibrate under any load, and the motion differential equation of the structural members under load is: （4） wherein, T denotes the time of the load action process, denotes the n sub-modal response function of the structural member; denote the first and second derivatives of the is the mass of the structural member; c is the damping force generated by the external damping; is the n natural vibration frequency of the structural member under the external average load; denotes the n excitation coefficient corresponding to the is the difference function of the random load and the average load on the structural member.

5. The dam simulation test platform stability analysis method of claim 4, wherein, In step S202, the random stable boundary conditions of the structural members are: （5） wherein is the stability boundary function of structural members of the dam simulation test platform; is the ratio of the circumference of a circle to its diameter; is the external average load; is the buckling load of the Euler column; n is the buckling load of the Euler column; EI is the bending stiffness of the structural member; is the mass of the structural member; L is the length of the structural member; is the mean load on the member; n is the natural frequency of vibration; is the cosine power spectral density function.

6. The dam simulation test platform stability analysis method of claim 5, wherein, In step S3, the calculation formula of the temperature load caused by large temperature difference is: T l = CTE x Δ T x E (6) wherein T l is the temperature load of the structural member of the dam simulation test platform, CTE is the linear expansion coefficient, and Δ T is the temperature change amount, E is the elastic modulus of the structural member.

7. The dam simulation test platform stability analysis method of claim 6, wherein, In step S501, the calculation formula of the impact force of the sediment flow liquid phase is: （7） In the formula is the impact pressure of the sediment flow to the dam simulation test platform, is the bulk density of the sediment flow, is the flow velocity of the sediment flow, g is the gravitational acceleration, α is the angle between the impact direction of the sediment flow and the impacted surface of the dam simulation test platform, λ is the shape coefficient of the dam simulation test platform.

8. The method according to claim 7, wherein, In step S502, the motion equation of the impact surface of the dam simulation test platform is: （8） In the formula is the displacement of the impact surface of the dam simulation test platform, t denotes time, x denotes the position of the impact surface of the dam simulation test platform in the transverse direction; is the density of the surface layer material of the dam simulation test platform; is the thickness of the surface layer of the dam simulation test platform; is the linear damping coefficient; denotes the bending stiffness, denotes the position x of the impact load.

9. The dam simulation test platform stability analysis method of claim 7, wherein, In step S6, the calculation formula of the snow load is: （9） wherein is the snow load value; is the snow distribution coefficient; denotes the snow pressure.

10. The dam simulation test platform stability analysis method of claim 9, wherein, When the sediment flow, wind load and snow load act together, the calculation and analysis are performed according to the following formula: （10） In the formula, F is the total force on the stress surface of the dam simulation test platform; is the angle between the wind direction of the wind load and the stress surface of the dam simulation test platform; represents the angle between the snow load force and the dam simulation test platform; represents the angle between the impact direction of the debris flow on the dam simulation test platform and the impact surface of the dam simulation test platform; represents the wind load value on the surface of the dam simulation test platform; represents the snow load value on the surface of the dam simulation test platform; represents the impact pressure of the debris flow on the dam simulation test platform.

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