Gate protection method with landslide surge weakening effect

Abstract

The invention discloses a gate protection method with a landslide surge weakening effect. The gate protection method comprises the steps that a protection device is fixed to the front portion of a gate panel through a connecting piece; the foamed aluminum filler is filled in the carbon fiber frame to form the protection device; the thickness determination mode of the protection device comprises the steps that a dam front water level change time history curve is obtained; static response of all components of the gate under the normal water storage level is calculated; calculating the dynamic response of each component of the gate under different protection thicknesses under the action of landslide surge when no protection device exists; according to the static response and the dynamic response of each component of the gate under different protection thicknesses under the action of landslide surge when no protection device exists, calculating the protection efficiency after the protection device with the corresponding thickness is additionally arranged; and determining the thickness of the protection device according to the protection efficiency. The method can weaken the impact of landslide surges on the gate, and is suitable for the safety protection design of the hydraulic steel gate with landslide in a reservoir area.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic steel gates, and in particular relates to a gate protection method capable of reducing the effect of landslide surge. Background Art

[0002] The flat steel gate is mainly composed of panels, vertical beams, main beams, side beams and other components. The panels bear the water pressure and other external loads, and transmit these forces to the gate's supporting structure through structural components such as main beams, vertical beams and side beams. Hydraulic steel gates are the throat of large-scale water conservancy and hydropower projects to regulate flow. Their safe and stable operation is directly related to the safety of life and property of the entire water conservancy hub and the people downstream.

[0003] Landslide surge is a natural geological disaster phenomenon. The dynamic water pressure of the surge generated by the landslide entering the water will have an adverse effect on the metal gate structure of the power station's water inlet. If the gate is unstable and damaged, not only will the safe and stable operation of the hydropower station be affected, but the lives and property of the people in the downstream area may also suffer huge losses.

[0004] In the prior art, researchers on landslide surge issues mostly focus on the process of landslide surge generation and propagation and the interaction between surge and dam, and often ignore the impact of landslide surge on hydraulic steel gates. At present, there is still a lack of corresponding standards in the field of hydraulic steel gate protection. The main approach is to set up wave-breaking rows and wave-breaking fences upstream of the gates and set up vents at the bottom of the breast wall to effectively reduce the impact of waves on the gates. In addition, technicians only use qualitative analysis instead of quantitative analysis to analyze the protection efficiency of such protection methods. Summary of the invention

[0005] Purpose: To solve the shortcomings of the prior art and address the problem that the dynamic water pressure of landslide surges has an adverse effect on gates, the present invention provides a gate protection method that can reduce the effect of landslide surges. In the event of a landslide surge, the impact of the landslide surge on the gate can be reduced to ensure the safety and stability of the gate.

[0006] Technical solution: To solve the above technical problems, the present invention provides a gate protection method capable of reducing the effect of landslide surge, and the technical solution adopted is:

[0007] The present invention provides a gate protection method capable of reducing the effect of landslide surge, comprising:

[0008] The protective device is fixed to the front of the gate panel through a connecting piece to reduce the landslide surge; wherein the protective device comprises a foam aluminum filler and a carbon fiber frame; the foam aluminum filler is filled in the carbon fiber frame to form the protective device, wherein the carbon fiber frame is a square hollow structure, and the width and height are determined according to the gate panel;

[0009] The method for determining the thickness of the protective device comprises:

[0010] Step S1, obtaining a time history curve of water level change in front of the dam;

[0011] Step S2, calculating the static response of each gate component under normal water level; the static response includes static displacement and static Mises stress; wherein the gate components include panels, main cross beam webs, vertical beam webs, side beam webs, and the gate as a whole;

[0012] Step S3, according to the time history curve of the water level change in front of the dam, the fluid-solid coupling method of the Navier-Stokes equation is used to calculate the dynamic response of each gate component under the action of the landslide surge when there is no protective device and at different protection thicknesses; wherein the dynamic response of each gate component when there is no protective device includes the unprotected displacement and the unprotected Mises stress, and the dynamic response of each gate component under different protection thicknesses includes the protected displacement and the protected Mises stress corresponding to the protection thickness;

[0013] Step S4, calculating the protection efficiency after installing the protection device of corresponding thickness according to the static response and the dynamic response of each gate component under the action of landslide surge with different protection thickness when there is no protection device; wherein the protection efficiency includes displacement protection efficiency and stress protection efficiency;

[0014] Step S5, determining the thickness of the protective device according to the protective efficiency.

[0015] In some embodiments, after step S5, the method further includes: determining the thickness of the foam aluminum filler according to the determined thickness of the protective device and the thickness of the carbon fiber frame.

[0016] In some embodiments, obtaining a time history curve of water level change in front of the dam includes:

[0017] The landslide surge in the reservoir area was simulated according to the numerical simulation method of computational fluid dynamics-discrete element method-immersed boundary method CFD-DEM-IBM, and the time history curve of water level change in front of the dam was obtained.

[0018] In some embodiments, in step S2, the hydrostatic pressure head of the gate at normal water level is 62 m.

[0019] In some embodiments, calculating the static response of each gate component under normal water level includes:

[0020] According to the deadweight of the gate and the hydrostatic pressure under normal water level, the static response of each gate component is calculated by finite element static analysis;

[0021] The static analysis equation of the gate structure is: ;

[0022] in, is the overall stiffness matrix in the global coordinate system; is the displacement array in the global coordinate system; is the load matrix in the global coordinate system;

[0023] The gate structure static analysis equation is used to solve the displacement component;

[0024] Substituting the displacement components into the plane stress and bending stress calculation equations, the static displacement and static Mises stress of each gate component in the corresponding local coordinate system are obtained.

[0025] In some embodiments, step S3 includes:

[0026] The initial water head is set in the water body in front of the gate. According to the time history curve of water level change in front of the dam, the interaction between fluid and solid in the reservoir water-protection-gate fluid-solid coupling model is considered, and the fluid-solid coupling method of the Navier-Stokes equation is used to calculate the dynamic response of each gate component under the action of landslide surge when there is no protection device and with different protection thicknesses.

[0027] The reservoir water-protection-gate fluid-solid coupling model includes the protection device being fixed to the front of the gate panel through a connecting piece to reduce the landslide surge of the reservoir water.

[0028] In some embodiments, in step S4, the protection efficiency after installing the protection device of corresponding thickness is calculated according to the static response and the dynamic response of each gate component under the action of landslide surge with different protection thicknesses when there is no protection device, including:

[0029] Displacement protection efficiency = (displacement without protection - displacement with protection) / static displacement × 100%;

[0030] Stress protection efficiency = (Mises stress without protection - Mises stress with protection) / static Mises stress × 100%.

[0031] In some embodiments, the thickness of the protective device needs to be calculated based on the calculation results to ensure the normal operation of the gate during the opening and closing process.

[0032] In some embodiments, the foam aluminum filler is made of foam aluminum, and the foam aluminum material density is 450 kg / m³, the elastic modulus is 0.27 GPa, and the Poisson's ratio is 0.32.

[0033] In some embodiments, the carbon fiber frame is made of carbon fiber, the carbon fiber material density is 1800 kg / m³, the elastic modulus is 12.9 GPa, and the Poisson's ratio is 0.3.

[0034] Furthermore, in some embodiments, the foam aluminum filler is used for buffering and energy absorption; the carbon fiber frame is used to reduce the deformation of the foam aluminum filler under hydrostatic pressure to ensure that the foam aluminum filler plays a role in buffering and energy absorption.

[0035] Beneficial effects: The present invention determines the thickness of the gate protection by obtaining the time-history curve of the water level change in front of the dam and the gate structure parameters, and then calculates the protection efficiency of the protection device. Compared with the prior art, the gate protection thickness and protection efficiency are calculated according to the fluid-solid coupling, which is convenient for engineering designers to determine the appropriate protection thickness and ensure the safe and stable operation of the gate. The present invention provides a gate protection method with the effect of reducing landslide surges, and a protection device with carbon fiber as a frame and foam aluminum as a filler is provided to reduce the impact of landslide surges on steel gates. The method is suitable for the safety protection design of hydraulic steel gates with landslides in reservoir areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of a rapid emergency gate and a gate protection method at a water inlet of a hydropower station according to an embodiment of the present invention;

[0037] Figure 2 Schematic diagram of the time course curve of the water level change in front of the dam in an embodiment of the present invention;

[0038] Figure 3 It is a schematic diagram of a reservoir water-protection-gate fluid-solid coupling model in an embodiment of the present invention;

[0039] Figure 4 Schematic diagram of the relationship between the protection thickness and protection efficiency of the gate protection device in an embodiment of the present invention.

[0040] In the figure: 1 protective device, 2 foam aluminum filler, 3 carbon fiber frame, 4 connecting piece, 5 rigid cover assumption, 6 non-slip solid wall, 7 fluid-solid coupling surface. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0043] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only used to explain the relative position relationship, movement, etc. between the components in a certain posture. If the specific posture changes, the directional indication will also change accordingly. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0044] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0045] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0046] Example 1: Figure 1 As shown, this embodiment provides a gate protection method capable of reducing the landslide surge effect, comprising:

[0047] The protective device 1 is fixed to the front of the gate panel through a connector 4 to reduce landslide surges; wherein the protective device 1 includes a foam aluminum filler 2 and a carbon fiber frame 3; the foam aluminum filler 2 is filled in the carbon fiber frame 3 to form the protective device 1, wherein the carbon fiber frame 3 is a square hollow structure, and the width and height are determined according to the gate panel; the thickness determination method of the protective device includes:

[0048] Step S1, obtaining a time history curve of water level change in front of the dam;

[0049] In some embodiments, step S1 may include: simulating landslide surges in the reservoir area according to a numerical simulation method of computational fluid dynamics-discrete element method-immersed boundary method CFD-DEM-IBM to obtain a time history curve of water level changes in front of the dam.

[0050] Step S2, calculating the static response of each gate component under normal water level; the static response includes static displacement and static Mises stress; wherein the gate components include panels, main cross beam webs, vertical beam webs, side beam webs, and the gate as a whole;

[0051] In some embodiments, in step S2, calculating the static response of each gate component under normal water level may include:

[0052] According to the deadweight of the gate and the hydrostatic pressure under normal water level, the static response of each gate component is calculated by finite element static analysis;

[0053] The static analysis equation of the gate structure is: ;

[0054] in, is the overall stiffness matrix in the global coordinate system; is the displacement array in the global coordinate system; is the load matrix in the global coordinate system;

[0055] The gate structure static analysis equation is used to solve the displacement component;

[0056] Substituting the displacement components into the plane stress and bending stress calculation equations, the static displacement and static Mises stress of each gate component in the corresponding local coordinate system are obtained.

[0057] Step S3, according to the time history curve of the water level change in front of the dam, the fluid-solid coupling method of the Navier-Stokes equation is used to calculate the dynamic response of each gate component under the action of the landslide surge when there is no protective device and at different protection thicknesses; wherein the dynamic response of each gate component when there is no protective device includes the unprotected displacement and the unprotected Mises stress, and the dynamic response of each gate component under different protection thicknesses includes the protected displacement and the protected Mises stress corresponding to the protection thickness;

[0058] In some embodiments, when calculating the dynamic response, an initial water head is set in the water body in front of the gate, and then the dynamic response of each gate component before and after the installation of the protective device is calculated based on the fluid-solid coupling method of the Navier-Stokes equation. Figure 3 As shown, the protective device is fixed to the front of the gate panel through a connector to reduce the impact of surge on the gate. The top boundary of the reservoir water is assumed to be a rigid cover 5, the front and rear boundaries and the bottom boundary adopt a non-slip solid wall 6, the lateral boundary adopts a sliding solid wall, and a fluid-solid coupling surface 7 is set between the reservoir water and the protective device.

[0059] Step S4, calculating the protection efficiency after installing the protection device of corresponding thickness according to the static response and the dynamic response of each gate component under the action of landslide surge with different protection thickness when there is no protection device; wherein the protection efficiency includes displacement protection efficiency and stress protection efficiency;

[0060] In some embodiments, step S4 may include:

[0061] Displacement protection efficiency = (displacement without protection - displacement with protection) / static displacement × 100%;

[0062] Stress protection efficiency = (Mises stress without protection - Mises stress with protection) / static Mises stress × 100%.

[0063] Step S5, determining the thickness of the protective device according to the protective efficiency.

[0064] It should be noted that the thickness of the protective device should not only meet the protection efficiency requirements, but also ensure the normal operation of the gate during the opening and closing process.

[0065] In some embodiments, after step S5, the method further includes: determining the thickness of the foam aluminum filler according to the determined thickness of the protective device and the thickness of the carbon fiber frame.

[0066] In some embodiments, the connecting member 4 is a bolt.

[0067] In this embodiment, the thickness of the carbon fiber frame is relatively fixed, and the thickness of the foam aluminum filler is equal to the thickness of the determined protective device minus the thickness of the carbon fiber frame on two surfaces.

[0068] In the present application, the foam aluminum material has the function of buffering and absorbing energy; the carbon fiber frame can reduce the deformation of the foam aluminum under hydrostatic pressure, ensuring that the foam aluminum filler plays the role of buffering and absorbing energy; the connecting piece is used to fix the protective device to the front of the gate panel.

[0069] The carbon fiber material used in this embodiment has a density of 1800 kg / m³, an elastic modulus of 12.9 GPa, and a Poisson's ratio of 0.3.

[0070] The density of the foamed aluminum material used in this embodiment is 450 kg / m³, the elastic modulus is 0.27 GPa, and the Poisson's ratio is 0.32.

[0071] In this embodiment, an analytical computational fluid dynamics-discrete element method-immersed boundary method (i.e., CFD-DEM-IBM method) is used to simulate the landslide surge in the reservoir area, and a time-history curve of the water level change in front of the dam is obtained. The dynamic water pressure obtained by the numerical simulation of the landslide surge is converted into a node load applied to the finite element model of the gate. The dynamic response of the flat gate under the action of the landslide surge is obtained by using the dynamic time-history method, so as to evaluate the safety of the gate and provide a scientific basis for the safe and stable operation of the hydropower station.

[0072] In some embodiments, the fluid-structure interaction method based on the Navier-Stokes equations includes:

[0073] (1) Finite element equations for incompressible viscous fluids

[0074] The continuity equation and Navier-Stokes equations for incompressible viscous fluids are:

[0075]

[0076]

[0077] Where: is the flow rate, t is the time, is the fluid density, p is the pressure, is the viscous stress tensor, is the fluid dynamic viscosity coefficient, is the physical force of the fluid, is the gradient symbol.

[0078] (2) Fluid-structure coupling strategy and solution

[0079] In the fluid-solid coupling system, the pressure of the fluid on the gate causes the gate to deform, and the gate in turn acts on the fluid, affecting the distribution of the flow field. The motion boundary conditions (displacement coordination) and dynamic boundary conditions (force balance) should be met on the fluid-solid coupling surface:

[0080]

[0081] In the formula, , are the stresses of fluid and solid structure respectively; , are the displacements of the fluid and solid structure respectively. n is the normal vector of the coupling surface.

[0082] The discrete coupled system equations can be expressed as:

[0083]

[0084]

[0085] In the formula, , , They represent velocity increment, pressure increment, and displacement increment respectively. and Represent the right-hand side of the fluid and solid control equations after discretization. , , The iterative calculation process is as follows:

[0086] (1) The motion and deformation of the solid at the k-1th iteration of the n+1th time step As the known condition of the kth iteration of the current n+1th time step, the coupling relationship between the fluid and the solid is released, and the velocity and pressure of the nth time step are , Solve for the velocity and pressure of the fluid at the kth iteration of the n+1th time step , ;

[0087] (2) Based on Obtain the free surface position and the physical property parameters of any point in the fluid domain;

[0088] (3) Based on , Solve the force of the fluid on the solid, and on this basis, the motion and deformation of the solid at the kth iteration of the n+1th time step can be calculated ;

[0089]

[0090]

[0091] (4) Based on Convergence judgment is performed, where Can be a variable , as well as , Corresponding to each variable If the convergence condition is met, the iteration is exited and the calculation of the next time step is performed. Otherwise, the above iterative process is repeated and the k+1th iteration of the n+1th time step is performed.

[0092] In the dynamic water flow field, the disturbed flow field for solving the fluid elastic body problem is not only related to the deformation of the elastic body, but also to the initial state. At this time, the disturbed water pressure not only produces additional mass, but also produces additional damping terms and additional stiffness terms.

[0093] Application example: The overall structure diagram of the gate structure and protective device is as follows Figure 1 As shown, a gate protection method for reducing landslide surge is provided in front of the gate panel. The protection device 1 is formed by foam aluminum filler 2 filled in a carbon fiber frame 3. The protection device 1 is fixed to the front of the gate panel through a connector 4 to reduce landslide surge.

[0094] In this embodiment, the gate structure parameters include: gate material and gate deadweight. In this embodiment, the gate structure is mainly made of Q355 steel. In the finite element calculation, the gate components are treated as linear elastic materials. The gravity acceleration is in the -z direction, and the magnitude is 9.81 m / s 2 The gate opening size (net width × net height) is 7 m × 11 m, with a water stop downstream. The water inlet sill elevation is 2205.00 m, and the platform elevation is 2287.00 m. When the gate is closed, the normal water level design head is 62 m, with a water stop downstream.

[0095] The time course curve of the water level change in front of the dam in this embodiment is as follows: Figure 2 As shown in the figure, the initial state of the reservoir water surface is set according to the law of wave elements.

[0096] Through finite element static calculation, the static response of each gate component under normal water level is obtained.

[0097] Reservoir water-protection-gate fluid-solid coupling model Figure 3 As shown in Figure 1, the protection efficiency of the protection device is calculated based on the fluid-solid coupling method based on the Navier-Stokes equation. Tables 1 and 2 show the maximum displacement of the main components of the gate under different protection thicknesses, the maximum Mises stress and the corresponding protection efficiency.

[0098] Table 1 Maximum displacement of main components of gate and displacement protection efficiency under different protection thicknesses

[0099]

[0100] Note: Displacement protection efficiency = (displacement without protection - displacement with protection) / static displacement × 100%;

[0101] Table 2 Maximum Mises stress and stress protection efficiency of gate main components under different protection thicknesses

[0102]

[0103] Note: Stress protection efficiency = (Mises stress without protection - Mises stress with protection) / static Mises stress × 100%.

[0104] like Figure 4 As shown in the figure, the gate protection thickness is positively correlated with the displacement and stress protection efficiency. Setting up protection devices can effectively reduce the impact of landslide surges on the gate.

[0105] In order to reduce the impact of landslide surges and reduce the impact of the protective device on the gate during normal opening and closing, a protective thickness of 10 cm is selected as the protection scheme of this embodiment in this application embodiment.

[0106] The technical means disclosed in the present application are not limited to the technical means disclosed in the above implementation mode, but also include technical solutions composed of any combination of the above technical features. The present application has been disclosed in the above preferred embodiments, but it is not used to limit the present application. Any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present application.

Claims

1. A gate protection method for reducing landslide surge, characterized in that: include: The protective device is fixed to the front of the gate panel through a connecting piece to reduce the landslide surge; wherein the protective device comprises a foam aluminum filler and a carbon fiber frame; the foam aluminum filler is filled in the carbon fiber frame to form the protective device, wherein the carbon fiber frame is a square hollow structure, and the width and height are determined according to the gate panel; The method for determining the thickness of the protective device comprises: Step S1, obtaining a time history curve of water level change in front of the dam; Step S2, calculating the static response of each gate component under normal water level; the static response includes static displacement and static Mises stress; wherein the gate components include panels, main cross beam webs, vertical beam webs, side beam webs, and the gate as a whole; Step S3, according to the time history curve of the water level change in front of the dam, the fluid-solid coupling method of the Navier-Stokes equation is used to calculate the dynamic response of each gate component under the action of the landslide surge when there is no protective device and at different protection thicknesses; wherein the dynamic response of each gate component when there is no protective device includes the unprotected displacement and the unprotected Mises stress, and the dynamic response of each gate component under different protection thicknesses includes the protected displacement and the protected Mises stress corresponding to the protection thickness; Step S4, calculating the protection efficiency after installing the protection device of corresponding thickness according to the static response and the dynamic response of each gate component under the action of landslide surge with different protection thickness when there is no protection device; wherein the protection efficiency includes displacement protection efficiency and stress protection efficiency; Step S5, determining the thickness of the protective device according to the protective efficiency.

2. The gate protection method according to claim 1, characterized in that: After step S5, the method further includes: determining the thickness of the foam aluminum filler according to the determined thickness of the protective device and the thickness of the carbon fiber frame.

3. The gate protection method according to claim 1, characterized in that: The step of obtaining the time history curve of the water level change in front of the dam includes: The landslide surge in the reservoir area was simulated according to the numerical simulation method of computational fluid dynamics-discrete element method-immersed boundary method CFD-DEM-IBM, and the time history curve of water level change in front of the dam was obtained.

4. The gate protection method according to claim 1, characterized in that: In step S2, the hydrostatic pressure head of the gate is 62 m at the normal water level.

5. The gate protection method according to claim 1, characterized in that: Calculate the static response of each gate component under normal water level, including: According to the deadweight of the gate and the hydrostatic pressure under normal water level, the static response of each gate component is calculated by finite element static analysis; The static analysis equation of the gate structure is: ; in, is the overall stiffness matrix in the global coordinate system; is the displacement array in the global coordinate system; is the load matrix in the global coordinate system; The gate structure static analysis equation is used to solve the displacement component; Substituting the displacement components into the plane stress and bending stress calculation equations, the static displacement and static Mises stress of each gate component in the corresponding local coordinate system are obtained.

6. The gate protection method according to claim 1, characterized in that: Step S3 includes: The initial water head is set in the water body in front of the gate. According to the time history curve of water level change in front of the dam, the interaction between fluid and solid in the reservoir water-protection-gate fluid-solid coupling model is considered, and the fluid-solid coupling method of the Navier-Stokes equation is used to calculate the dynamic response of each gate component under the action of landslide surge when there is no protection device and with different protection thicknesses. The reservoir water-protection-gate fluid-solid coupling model includes the protection device being fixed to the front of the gate panel through a connecting piece to reduce the landslide surge of the reservoir water.

7. The gate protection method according to claim 1, characterized in that: In step S4, the protection efficiency after installing the protection device of the corresponding thickness is calculated according to the static response and the dynamic response of each gate component under the action of landslide surge with different protection thicknesses when there is no protection device, including: Displacement protection efficiency = (displacement without protection - displacement with protection) / static displacement × 100%; Stress protection efficiency = (Mises stress without protection - Mises stress with protection) / static Mises stress × 100%.

8. The gate protection method according to claim 1, characterized in that: The foam aluminum filler is made of foam aluminum, and the density of the foam aluminum material is 450 kg / m³, the elastic modulus is 0.27 GPa, and the Poisson's ratio is 0.

32.

9. The gate protection method according to claim 1, characterized in that: The carbon fiber frame is made of carbon fiber, the carbon fiber material density is 1800 kg / m³, the elastic modulus is 12.9 GPa, and the Poisson's ratio is 0.

3.

10. The gate protection method according to any one of claims 1 to 9, characterized in that: The foam aluminum filler is used for buffering and absorbing energy; the carbon fiber frame is used for reducing the deformation of the foam aluminum filler under hydrostatic pressure, so as to ensure that the foam aluminum filler plays the role of buffering and absorbing energy.

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