Combined bank protection method and system for the middle reaches of the Yangtze River under multi-source hydraulic coupling

Abstract

This application provides a method and system for combined bank protection of the middle reaches of the Yangtze River under multi-source hydraulic coupling. The method includes: establishing a two-dimensional finite element model of the bank slope based on geological, hydrological, and design data of the slope location; obtaining measured rainfall and water level change data and applying them as boundary conditions to the bank protection structure of the two-dimensional finite element model of the slope, and calculating pore water pressure; calculating wave pressure on the slope; calculating the horizontal displacement and safety factor of the slope using different combined bank protection structures based on measured rainfall and water level change data, pore water pressure of the slope soil under rainfall-water level action, and wave pressure; and obtaining the bank protection method based on the clay layer thickness, horizontal displacement, and safety factor. This application considers the safety of the slope and bank protection under multi-source hydraulic coupling, and obtains accurate riverbank safety information through comparison, providing theoretical support for bank protection selection.

Description

Technical Field

[0001] This application relates to the field of bank protection engineering technology, specifically to a method and system for combined bank protection of the middle reaches of the Yangtze River under multi-source hydraulic coupling. Background Technology

[0002] my country has numerous river systems with winding channels. For example, the soil composition of the riverbanks in the middle reaches of the Yangtze River is mostly binary, consisting of an upper layer of cohesive soil and a lower layer of sandy soil. Generally, the cohesive soil cover is thicker, while the sandy soil cover is thinner, resulting in generally lower resistance to erosion. In recent years, the middle reaches of the Yangtze River have gradually developed complex hydrological conditions and the superimposed effect of periodic hydrological fluctuations, making the riverbank erosion and damage process more complex under the combined action of multiple hydraulic sources (such as rainfall-water level-wave force). Bank protection engineering is an effective measure to protect riverbanks from collapse. In the construction of bank protection projects in the middle reaches of the Yangtze River, common bank protection projects above the low water level include crushed stone revetments, dry-laid rubble masonry, mortar-grouted rubble masonry, bagged concrete, and precast concrete blocks; slope toe protection below the low water level typically uses riprap, bagged concrete, and permeable frames. However, these slope protection and toe protection projects are highly susceptible to damage under the combined action of multiple hydraulic sources, making it difficult to simultaneously achieve ecological and safety benefits. Therefore, the rational selection of combined revetments is crucial for protecting bank slope stability and ecology.

[0003] Current research on the selection of revetment for the middle reaches of the Yangtze River has shortcomings. These shortcomings primarily manifest in the fact that stability analyses of revetment in the middle reaches of the Yangtze mainly consider rainfall-water level-wave force factors, with very little consideration for the impact of slope soil composition on revetment stability. Furthermore, the selection of revetment in the middle reaches of the Yangtze often relies too heavily on the experience of engineers, which primarily serves the purposes of slope safety and economy, making it difficult to balance slope protection with ecological benefits. Existing research largely focuses on revetment structure and materials, lacking research on revetment selection methods. Summary of the Invention

[0004] This application provides a combined bank protection method for the middle reaches of the Yangtze River under multi-source hydraulic coupling, which can solve the technical problem in the prior art that does not take into account both the safety benefits and ecological benefits of bank protection.

[0005] Firstly, this application provides a method for combined bank protection of the middle reaches of the Yangtze River under multi-source hydraulic coupling, comprising the following steps:

[0006] A two-dimensional finite element model of the riverbank was established based on the geological, hydrological and design data of the location of the riverbank in the middle reaches of the Yangtze River.

[0007] Accurate rainfall data and water level change data are obtained and applied as boundary conditions to the revetment structure of the two-dimensional finite element model of the bank slope. The pore water pressure of the bank slope soil under the action of rainfall and water level fluctuation is calculated.

[0008] Calculate and obtain the wave pressure on the bank slope;

[0009] Based on measured rainfall data, measured water level change data, pore water pressure and wave pressure of the slope soil under the action of rainfall and water level fluctuations, the horizontal displacement and safety factor of the slope using different combined revetment structures are calculated.

[0010] Based on the clay layer thickness in the basic data of the bank slope and the calculated horizontal displacement and safety factor of the bank slope using different combined revetment structures, the bank slope protection method is obtained.

[0011] In conjunction with the first aspect, in one implementation method, the establishment of a two-dimensional finite element model of the riverbank based on geological data, hydrological data, and riverbank design data of the location of the riverbank in the middle reaches of the Yangtze River specifically includes the following steps:

[0012] Collect basic geological and hydrological data of the bank slope, select typical bank slope profiles, and obtain the soil composition distribution of the typical bank slope profiles. The typical bank slope profiles are the most representative profiles.

[0013] Based on the soil composition distribution of the selected typical bank slope profile, selectable combined bank protection structures are determined.

[0014] Based on the basic data and structural design data of the bank slope, obtain the soil parameters and revetment structural parameters of the bank slope.

[0015] Based on the selected typical bank slope profile, the available combined bank protection structures, and the parameters of the bank slope soil and bank protection structures, a two-dimensional finite element model of the bank slope is constructed.

[0016] In conjunction with the first aspect, in one embodiment, the method of determining selectable combined revetment structures based on the soil composition distribution of a selected typical bank slope profile includes rigid revetment structures and ecological revetment structures.

[0017] In conjunction with the first aspect, in one embodiment, the step of acquiring measured rainfall data and measured water level change data and applying them as boundary conditions to the revetment structure of a two-dimensional finite element model of the bank slope, and calculating the pore water pressure of the bank slope soil under the action of rainfall and water level fluctuations, specifically includes the following steps:

[0018] Obtain measured rainfall data and measured water level change data at the location of the riverbank slope;

[0019] The measured rainfall data and water level change data at the location of the bank slope are used as boundary conditions to apply to the bank slope two-dimensional finite element model with different bank protection structures, and the pore water pressure of the bank slope soil under the action of rainfall and water level fluctuation is calculated.

[0020] In conjunction with the first aspect, in one implementation, the calculation of wave pressure on the bank slope is as shown in the following formula:

[0021] P=K P K1K2K3γ w h s

[0022] In the formula, P is the wave pressure, K1 is the first coefficient, and K P K2 is the frequency conversion factor, K3 is the second factor, and K4 is the third factor. w h is the specific gravity of water. s The effective wave height.

[0023] In conjunction with the first aspect, in one implementation, the calculation of the horizontal displacement and safety factor of the bank slope using different combined revetment structures, based on measured rainfall data, measured water level change data, pore water pressure and wave pressure of the bank slope soil under the action of rainfall and water level fluctuations, specifically includes the following steps:

[0024] Input measured rainfall data, measured water level change data, pore water pressure and wave pressure of the bank slope under the action of rainfall and water level into the finite element software for calculation, and obtain the horizontal displacement and safety factor of the bank slope with different combination of revetment structures.

[0025] In conjunction with the first aspect, in one embodiment, the method for obtaining bank protection based on the clay layer thickness in the bank slope foundation data and the calculated horizontal displacement and safety factor of the bank slope using different combined bank protection structures specifically includes the following steps:

[0026] For the same clay layer thickness, the greater the horizontal displacement of the bank slope and the smaller the safety factor, the worse the bank protection effect is.

[0027] Secondly, this application provides a combined bank protection system for the middle reaches of the Yangtze River under multi-source hydraulic coupling, comprising:

[0028] The bank slope finite element model construction module is used to build a two-dimensional finite element model of the bank slope based on the geological data, hydrological data and bank slope design data of the location of the bank slope in the middle reaches of the Yangtze River.

[0029] The seepage law acquisition module is communicatively connected to the bank slope finite element model construction module. It is used to acquire measured rainfall data and measured water level change data and apply them as boundary conditions to the bank protection structure of the two-dimensional finite element model of the bank slope, and calculate the pore water pressure of the bank slope soil under the action of rainfall and water level fluctuation.

[0030] Wave pressure acquisition unit, used to calculate and acquire wave pressure on the bank slope;

[0031] The bank protection evaluation index acquisition unit is communicatively connected to the seepage law acquisition module and the wave pressure acquisition unit. It is used to calculate and obtain the horizontal displacement and safety factor of the bank slope using different combinations of bank protection structures based on the measured rainfall data, measured water level change data, pore water pressure of the bank slope soil under the action of rainfall and water level fluctuations, and wave pressure.

[0032] The bank protection method acquisition module is communicatively connected to the bank protection evaluation index acquisition unit. It is used to acquire bank protection methods based on the clay layer thickness in the bank slope basic data and the horizontal displacement and safety factor of the bank slope using different combination bank protection structures.

[0033] In conjunction with the second aspect, in one implementation, the bank slope finite element model construction module includes:

[0034] The bank slope structure information acquisition unit is used to collect basic geological and hydrological data of the bank slope, select typical bank slope profiles, and obtain the soil composition distribution of the typical bank slope profiles. The typical bank slope profiles are the most representative profiles.

[0035] A unit for determining the combination revetment structure is provided, which is communicatively connected to the slope structure information acquisition unit, and determines the available combination revetment structure based on the soil composition distribution of the selected typical slope profile.

[0036] The slope and revetment structure parameter acquisition unit is communicatively connected to the slope structure information acquisition unit and the revetment structure selection and combination determination unit, and is used to acquire slope soil parameters and revetment structure parameters based on slope foundation data and slope structure design data.

[0037] The bank slope model construction unit communicates with the bank slope structure information acquisition unit, the selectable combination revetment structure determination unit, and the bank slope and revetment structure parameter acquisition unit. It is used to construct a two-dimensional finite element model of the bank slope based on the selected typical bank slope profile, the selectable combination revetment structures, and the bank slope soil parameters and revetment structure parameters.

[0038] Thirdly, this application provides a computer-readable storage medium storing a program for combined bank protection of the middle reaches of the Yangtze River under multi-source hydraulic coupling, wherein when the program is executed by a processor, it implements the steps of the method for combined bank protection of the middle reaches of the Yangtze River under multi-source hydraulic coupling as described above.

[0039] The beneficial effects of the technical solutions provided in this application include at least the following:

[0040] Based on geological and hydrological data, this application establishes a two-dimensional finite element model to calculate the safety of riverbank slopes and revetments under the multi-source hydraulic coupling effects of rainfall, water level fluctuations, and wave impact. Through comparison, the accurate riverbank safety situation is obtained, which can take into account both the safety and ecological benefits of revetments, providing theoretical support for the selection of revetments and having certain guiding significance for the selection and safety management of revetments. Attached Figure Description

[0041] Figure 1 This is a schematic diagram illustrating the specific process of the combined bank protection method for the middle reaches of the Yangtze River under multi-source hydraulic coupling in the embodiments of this application.

[0042] Figure 2 This is a model diagram of the ecological brick revetment involved in the embodiments of this application;

[0043] Figure 3 This is a model diagram of the precast concrete block revetment involved in the embodiments of this application;

[0044] Figure 4 This is a cross-sectional view of the ecological brick revetment slope model involved in the embodiments of this application;

[0045] Figure 5 This is a cross-sectional view of the precast concrete block revetment slope model involved in the embodiments of this application;

[0046] Figure 6 This is a simplified model diagram of the steel sheet pile involved in the embodiments of this application;

[0047] Figure 7 This is a two-dimensional finite element diagram of the ecological brick-steel sheet pile combined revetment slope involved in the embodiments of this application;

[0048] Figure 8 This is a two-dimensional finite element diagram of the precast concrete block-steel sheet pile composite revetment slope involved in the embodiments of this application;

[0049] Figure 9 (a) shows the calculation results of the ecological brick-steel sheet pile combined revetment slope involved in the embodiment of this application - a schematic diagram of horizontal displacement; Figure 9 (b) is a schematic diagram of the calculation results and safety factor of the ecological brick-steel sheet pile combined revetment slope involved in the embodiment of this application;

[0050] Figure 10 (a) is a schematic diagram of the horizontal displacement of the precast concrete block-steel sheet pile combined revetment slope involved in the embodiment of this application; Figure 10 (b) is a schematic diagram of the safety factor of the precast concrete block-steel sheet pile combined revetment slope involved in the embodiment of this application. Detailed Implementation

[0051] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0052] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit the "first", "second" and "third" to different types.

[0053] In the description of the embodiments of this application, the words "exemplary," "for example," or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary," "for example," or "for example" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "for example," or "for example" is intended to present the relevant concepts in a concrete manner.

[0054] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0055] In some processes described in the embodiments of this application, multiple operations or steps are included in a specific order. However, it should be understood that these operations or steps may not be executed in the order they appear in the embodiments of this application, or they may be executed in parallel. The sequence number of the operation is only used to distinguish different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed sequentially or in parallel, and these operations or steps may be combined.

[0056] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0057] Firstly, please refer to Figure 1 This application provides a method for combined bank protection of the middle reaches of the Yangtze River under multi-source hydraulic coupling, including the following steps:

[0058] Step S1: Establish a two-dimensional finite element model of the riverbank based on the geological, hydrological, and design data of the riverbank in the middle reaches of the Yangtze River.

[0059] Step S2: Obtain measured rainfall data and measured water level change data and apply them as boundary conditions to the revetment structure of the two-dimensional finite element model of the bank slope. Calculate the pore water pressure of the bank slope soil under the action of rainfall and water level fluctuations. In this step, the boundary conditions are input quantities, that is, the actual rainfall and actual water level values ​​are used as input quantities for calculation in the two-dimensional finite element model of the bank slope to obtain the pore water pressure of the bank slope soil under the action of rainfall and water level fluctuations.

[0060] Step S3: Calculate and obtain the wave pressure on the bank slope;

[0061] Step S4: Based on measured rainfall data, measured water level change data, pore water pressure and wave pressure of the slope soil under the action of rainfall and water level fluctuations, calculate and obtain the horizontal displacement and safety factor of the slope using different combined revetment structures;

[0062] Step S5: Based on the clay layer thickness in the bank slope basic data and the calculated horizontal displacement and safety factor of the bank slope using different combined bank protection structures, obtain the bank slope protection method.

[0063] Based on geological and hydrological data, this application establishes a two-dimensional finite element model to calculate the safety of riverbank slopes and revetments under the multi-source hydraulic coupling effects of rainfall, water level fluctuations, and wave impact. Through comparison, the accurate riverbank safety situation is obtained, which can take into account both the safety and ecological benefits of revetments, providing theoretical support for the selection of revetments and having certain guiding significance for the selection and safety management of revetments.

[0064] In one embodiment, step S1, establishing a two-dimensional finite element model of the riverbank based on geological data, hydrological data, and riverbank design data of the location of the riverbank in the middle reaches of the Yangtze River, specifically includes the following steps:

[0065] Step S11: Collect basic geological and hydrological data of the riverbank, select typical riverbank profiles, and obtain the soil composition distribution of the typical riverbank profiles. The typical riverbank profiles are the profiles that best represent the soil composition distribution of the riverbanks in the middle reaches of the Yangtze River. Specifically, the soil composition distribution of the riverbanks in the middle reaches of the Yangtze River is basically a binary structure, that is, a two-layer soil structure, with the upper layer being cohesive soil and the lower layer being sandy soil.

[0066] Step S12: Based on the soil composition distribution of the selected typical bank slope profile, determine the available combination revetment structures.

[0067] Step S13: Based on the bank slope foundation data and bank slope structure design data, obtain the bank slope soil parameters and bank protection structure parameters;

[0068] Step S14: Based on the selected typical bank slope profile, the available combined bank protection structures, and the bank slope soil parameters and bank protection structure parameters, construct a two-dimensional finite element model of the bank slope.

[0069] Based on steps S11-S14, a two-dimensional finite element model of the bank slope is constructed to obtain the seepage law of the bank slope under the action of rainfall and water level. This model is used as one of the multi-source hydraulic coupling effects to analyze the bank slope protection effect of the combined bank protection structure.

[0070] In one embodiment, step S12 involves determining the selectable combined revetment structures based on the soil composition distribution of the selected typical bank slope profile. These selectable combined revetment structures include rigid revetment structures, ecological revetment structures, and combinations of both. Specifically, since the selected typical bank slope profile in the middle reaches of the Yangtze River has a binary structure of upper cohesive soil and lower sandy soil, the selectable combined revetment structures must primarily include ecological revetment structures and rigid revetment structures, both based on structural support. More specifically, the ecological revetment structure includes ecological bricks and sheet piles. Ecological bricks are generally suitable for gently sloping terrain, such as... Figure 2 As shown, sheet piles are costly and have some environmental impact during construction; rigid revetment structures are represented by precast concrete blocks. Precast concrete blocks can reduce river erosion of the riverbank and improve its stability, but they close off the riverbank and have no ecological benefits. A model diagram of a precast concrete block revetment is shown below. Figure 3 As shown, bank protection is generally carried out by combining ecological bank protection structures and rigid bank protection structures.

[0071] In one embodiment, step S13, obtaining the slope soil parameters and revetment structure parameters based on the slope foundation data and slope structure design data, specifically includes the following steps:

[0072] Step S131: Calculate the soil volumetric water content θ based on the Van Genuchten model, as shown in the following formula:

[0073]

[0074] In the formula, θ is the soil volumetric water content (cm³). 3 / cm 3 h is the pressure head (cm), θ r and θ s These represent the residual and saturated volumetric water content of the soil, respectively (cm). 3 / cm 3 ), where α and n are empirical fitting parameters that determine the saturated / unsaturated material model;

[0075] Step S132: Based on Mohr-Coulomb's theory, calculate and obtain the soil shear strength, as shown in the following formula:

[0076]

[0077] In the formula, τ is the soil shear strength, c is the soil cohesion, and σ is the soil normal stress. It is the internal friction angle of the soil;

[0078] Based on steps S131 and S132, the soil volumetric water content and soil shear strength of the bank slope are obtained. Then, based on the structural design data of the bank slope and the soil volumetric water content and soil shear strength of the bank slope, the structural design parameters and material strength and other property parameters of the selectable combined bank protection structure are calculated and obtained, thereby constructing the constitutive model of the combined bank protection structure.

[0079] In one embodiment, step S2: acquiring measured rainfall data and measured water level change data and applying them as boundary conditions to the revetment structure of the two-dimensional finite element model of the bank slope, and calculating the pore water pressure of the bank slope soil under the action of rainfall and water level fluctuations, specifically includes the following steps:

[0080] Step S21: Obtain measured rainfall data and measured water level change data at the location of the bank slope;

[0081] Step S22: Apply the measured rainfall data and water level change data at the location of the bank slope as boundary conditions to the bank slope two-dimensional finite element model using different bank protection structures. The cross-sectional view of the ecological brick bank slope model is shown below. Figure 4 The cross-sectional view of the precast concrete block revetment slope model is as follows: Figure 5 A simplified model diagram of a steel sheet pile is shown below. Figure 6The study calculates the pore water pressure of the slope soil under the influence of rainfall and water level fluctuations for different revetment structures. Specifically, based on saturated and unsaturated seepage theories, measured rainfall and water level change data at the location of the slope are applied to the revetment structure of the two-dimensional finite element model of the slope. The pore water pressure of the slope soil is obtained after applying the measured rainfall and water level change data as boundary conditions. In particular, the seepage law of the slope is calculated using finite element analysis software such as Geostudio to obtain the pore water pressure of the slope soil.

[0082] Among them, the revetment structure is a selectable combination revetment structure. For example, the selectable combination revetment structures are ecological brick-steel sheet pile combination revetment structure and concrete precast block-steel sheet pile combination revetment structure. Then, the measured rainfall data and measured water level change data at the location of the bank slope are used as boundary conditions and applied to the revetment structure of the two-dimensional finite element model of the bank slope of the two different combination revetment structures. The pore water pressure of the soil in the two-dimensional finite element model of the bank slope is obtained and used for subsequent calculation of the safety factor of the bank slope and the horizontal displacement of the two combination revetment structures.

[0083] Saturated seepage refers to soil pores being completely filled with water, such as water flowing through sediment at the bottom of a river. Unsaturated seepage refers to soil pores not being completely filled with water, such as during rain when the soil is not fully infiltrated; in this case, the water flow is unsaturated. In this application, saturated / unsaturated seepage needs to be considered before calculating the seepage law of the bank slope under the action of rainfall and water level, that is, the pore water pressure of the bank slope soil in the seepage field.

[0084] In one embodiment, step S3: Calculate and obtain the wave pressure on the bank slope, as shown in the following formula:

[0085] P=K P K1K2K3γ w h s

[0086] In the formula, P represents wave pressure, and K1 is the first coefficient. K P K1 is a frequency conversion factor, typically taken as 1.35; K2 is a coefficient, typically taken as 1.15; K3 is a coefficient, typically taken as 2.45; γ w The specific weight of water (kN / m³) 3 ),h s The effective wave height is L, the average wavelength (m) is m, and the slope ratio is m.

[0087] In one embodiment, step S4: based on measured rainfall data, measured water level change data, pore water pressure and wave pressure of the bank slope soil under the action of rainfall and water level fluctuations, calculates and obtains the horizontal displacement and safety factor of the bank slope using different combined revetment structures, specifically including the following steps:

[0088] Input measured rainfall data, measured water level change data, pore water pressure and wave pressure of the bank slope under the action of rainfall and water level into the finite element software for calculation to obtain the horizontal displacement and safety factor of the bank slope using different combination revetment structures; specifically, input measured rainfall data, measured water level change data, pore water pressure and wave pressure of the bank slope under the action of rainfall and water level into the Slope module in Geostudio for calculation to obtain the horizontal displacement and safety factor of the bank slope.

[0089] In one embodiment, step S5: Based on the clay layer thickness in the bank slope foundation data and the calculated horizontal displacement and safety factor of the bank slope using different combined revetment structures, a bank slope protection method is obtained, specifically including the following steps:

[0090] For the same clay layer thickness, the greater the horizontal displacement of the bank slope and the smaller the safety factor, the worse the bank protection effect is.

[0091] In one specific embodiment, the combined bank protection method for the middle reaches of the Yangtze River under multi-source hydraulic coupling provided in this application is used to study the selection of combined bank protection for a certain river channel in the middle and lower reaches of the Yangtze River. The soil composition of the bank slope of this river channel in the middle and lower reaches of the Yangtze River is mainly a binary structure, that is, the upper layer is cohesive soil and the lower layer is sandy soil. The main bank protection forms adopted are ecological brick-steel sheet pile combined bank protection and concrete precast block-steel sheet pile combined bank protection. Taking a clay layer thickness of 7m as an example, a two-dimensional finite element model of the bank slope is established, such as... Figure 7 , Figure 8 As shown. The model is 50m long, 34.5m high, and has a slope angle of 30°. The bank slope soil consists of clay and sand, with a clay thickness of 7m and a sand thickness of 27.5m. The bank slope protection structure is a combination of steel sheet piles and precast concrete blocks, and a combination of steel sheet piles and eco-bricks. The precast concrete blocks and eco-bricks cover the sloping bank slope. The steel sheet piles are 13.5m long in total, with a 7.5m section extending into the riverbed bottom, resulting in an insertion ratio of 0.8. Three anchor rods, each 6m long, are vertically inserted into the bank slope soil on the back of the steel sheet piles, spaced 1.5m apart.

[0092] The soil layers, precast concrete blocks, and eco-bricks were simulated using the Mohr-Coulomb model, while the sheet piles were simulated using beam elements, and the anchor bolts were simulated using bar elements. The beam element had an elastic modulus of 210 GPa and a cross-sectional area of ​​0.002 m². 2 Moment of inertia 0.005m 4 The stiffness of the rod element support is 50 MN / m.2 The model is pre-loaded with an axial force of 140 kN / m and a Young's modulus of 208 GPa. Displacement constraints are set on the left and right sides and bottom of the model. Rainfall boundary conditions are set on the top of the model and the sloping bank, with a rainfall intensity of 0.04 m / d, a rainfall duration of 5 days, a maximum water level of 31.5 m, and a wave force of 5.8 kPa.

[0093] The combined bank protection method for the middle reaches of the Yangtze River under multi-source hydraulic coupling provided in this application yields the following results: the horizontal displacement and safety factor of the bank slope are shown in Table 1.

[0094] Table 1. Safety factor and horizontal displacement of combined revetments with different slope compositions.

[0095]

[0096] The calculation results for the ecological brick-steel sheet pile combined revetment slope in the embodiment are shown in the figure. Figure 9 (a)- Figure 9 As shown in (b), the calculation results of the precast concrete block-steel sheet pile composite revetment slope in the embodiment are shown below. Figure 10 (a)- Figure 10 As shown in (b), when the clay layer of the bank slope is 1m, the safety factor of the precast concrete block bank slope is 0.54 greater than that of the ecological brick bank slope. As the thickness of the clay layer increases, the safety factors of the two types of bank slope gradually become close. It can be seen that when the clay layer thickness is less than 5m, the precast concrete block bank slope has a better effect on bank slope reinforcement. When the clay layer is greater than 5m, considering the ecological effect of the ecological brick bank slope, the ecological brick bank slope is better to be selected.

[0097] Therefore, when the thickness of the clay layer on the bank slope is less than the preset thickness, the ecological brick-steel sheet pile combined revetment structure provides better bank protection safety; when the thickness of the clay layer on the bank slope is not less than the preset thickness, the precast concrete block-steel plate combined revetment structure provides better bank protection. In the above embodiment, the preset thickness is 5m.

[0098] Secondly, this application provides a combined bank protection system for the middle reaches of the Yangtze River under multi-source hydraulic coupling, comprising:

[0099] The bank slope finite element model construction module is used to build a two-dimensional finite element model of the bank slope based on the geological data, hydrological data and bank slope design data of the location of the bank slope in the middle reaches of the Yangtze River.

[0100] The seepage law acquisition module is communicatively connected to the bank slope finite element model construction module. It is used to acquire measured rainfall data and measured water level change data and apply them as boundary conditions to the bank protection structure of the two-dimensional finite element model of the bank slope, and calculate the pore water pressure of the bank slope soil under the action of rainfall and water level fluctuation.

[0101] Wave pressure acquisition unit, used to calculate and acquire wave pressure on the bank slope;

[0102] The bank protection evaluation index acquisition unit is communicatively connected to the seepage law acquisition module and the wave pressure acquisition unit. It is used to calculate and obtain the horizontal displacement and safety factor of the bank slope using different combinations of bank protection structures based on the measured rainfall data, measured water level change data, pore water pressure of the bank slope soil under the action of rainfall and water level fluctuations, and wave pressure.

[0103] The bank protection method acquisition module is communicatively connected to the bank protection evaluation index acquisition unit. It is used to acquire bank protection methods based on the clay layer thickness in the bank slope basic data and the horizontal displacement and safety factor of the bank slope using different combination bank protection structures.

[0104] In one embodiment, the bank slope finite element model construction module includes:

[0105] The bank slope structure information acquisition unit is used to collect basic geological and hydrological data of the bank slope, select typical bank slope profiles, and obtain the soil composition distribution of the typical bank slope profiles. The typical bank slope profiles are the most representative profiles.

[0106] A unit for determining the combination revetment structure is provided, which is communicatively connected to the slope structure information acquisition unit, and determines the available combination revetment structure based on the soil composition distribution of the selected typical slope profile.

[0107] The slope and revetment structure parameter acquisition unit is communicatively connected to the slope structure information acquisition unit and the revetment structure selection and combination determination unit, and is used to acquire slope soil parameters and revetment structure parameters based on slope foundation data and slope structure design data.

[0108] The bank slope model construction unit communicates with the bank slope structure information acquisition unit, the selectable combination revetment structure determination unit, and the bank slope and revetment structure parameter acquisition unit. It is used to construct a two-dimensional finite element model of the bank slope based on the selected typical bank slope profile, the selectable combination revetment structures, and the bank slope soil parameters and revetment structure parameters.

[0109] Thirdly, this application provides a combined bank protection device for the middle reaches of the Yangtze River under multi-source hydraulic coupling. The combined bank protection device for the middle reaches of the Yangtze River under multi-source hydraulic coupling can be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0110] The communication interface includes input / output (I / O) interfaces, physical interfaces, and logical interfaces. These interfaces are used for interconnecting components within the combined bank protection equipment in the middle reaches of the Yangtze River under multi-source hydraulic coupling, and for interconnecting the combined bank protection equipment with other devices (such as other computing devices or user equipment). Physical interfaces can be Ethernet interfaces, fiber optic interfaces, ATM interfaces, etc.; user equipment can be displays, keyboards, etc.

[0111] Memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0112] The processor can be a general-purpose processor, which can call the bank protection program for combined bank protection under multi-source hydraulic coupling in the middle reaches of the Yangtze River stored in the memory, and execute the bank protection method for combined bank protection under multi-source hydraulic coupling in the middle reaches of the Yangtze River provided in the embodiments of this application. For example, the general-purpose processor can be a central processing unit (CPU). The method executed when the bank protection program for combined bank protection under multi-source hydraulic coupling in the middle reaches of the Yangtze River is called can refer to the various embodiments of the bank protection method for combined bank protection under multi-source hydraulic coupling in the middle reaches of the Yangtze River in this application, and will not be repeated here.

[0113] Fourthly, embodiments of this application also provide a readable storage medium.

[0114] This application stores a program for combined bank protection of the middle reaches of the Yangtze River under multi-source hydraulic coupling on a readable storage medium. When the program is executed by a processor, it implements the steps of the method for combined bank protection of the middle reaches of the Yangtze River under multi-source hydraulic coupling as described above.

[0115] The method implemented when the combined bank protection procedure of the middle reaches of the Yangtze River under multi-source hydraulic coupling is executed can be referred to in the various embodiments of the combined bank protection method of the middle reaches of the Yangtze River under multi-source hydraulic coupling in this application, and will not be repeated here.

[0116] It should be noted that the sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0117] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods described in the various embodiments of this application.

[0118] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method for combined bank protection of the middle reaches of the Yangtze River under multi-source hydraulic coupling, characterized in that, Includes the following steps: A two-dimensional finite element model of the riverbank was established based on geological, hydrological, and design data of the location of the riverbank in the middle reaches of the Yangtze River. The specific steps include: Collect basic geological and hydrological data of the bank slope, select typical bank slope profiles, and obtain the soil composition distribution of the typical bank slope profiles. The typical bank slope profiles are the most representative profiles. Based on the soil composition distribution of the selected typical bank slope profile, selectable combined bank protection structures are determined. Based on the basic data and structural design data of the bank slope, obtain the soil parameters and revetment structural parameters of the bank slope. Based on the selected typical bank slope profile, the available combined bank protection structures, and the parameters of the bank slope soil and bank protection structure, a two-dimensional finite element model of the bank slope is constructed. Based on the soil composition distribution of selected typical bank slope profiles, the available combined revetment structures include rigid revetment structures and ecological revetment structures. The ecological revetment structures include ecological bricks and sheet piles; the rigid revetment structures are represented by precast concrete blocks. Accurate rainfall data and water level change data are obtained and applied as boundary conditions to the revetment structure of the two-dimensional finite element model of the bank slope. The pore water pressure of the bank slope soil under the action of rainfall and water level fluctuation is calculated. Calculate and obtain the wave pressure on the bank slope; Based on measured rainfall data, measured water level change data, pore water pressure and wave pressure of the slope soil under the action of rainfall and water level fluctuations, the horizontal displacement and safety factor of the slope using different combined revetment structures are calculated. Based on the clay layer thickness in the basic data of the bank slope and the calculated horizontal displacement and safety factor of the bank slope using different combined revetment structures, the bank slope protection method is obtained.

2. The method for combined bank protection of the middle reaches of the Yangtze River under multi-source hydraulic coupling as described in claim 1, characterized in that, The process of acquiring measured rainfall data and measured water level change data and applying them as boundary conditions to the revetment structure of the two-dimensional finite element model of the bank slope, and calculating the pore water pressure of the bank slope soil under the action of rainfall and water level fluctuations, specifically includes the following steps: Obtain measured rainfall data and measured water level change data at the location of the riverbank slope; The measured rainfall data and water level change data at the location of the bank slope are used as boundary conditions to apply to the bank slope two-dimensional finite element model with different bank protection structures, and the pore water pressure of the bank slope soil under the action of rainfall and water level fluctuation is calculated.

3. The method for combined bank protection of the middle reaches of the Yangtze River under multi-source hydraulic coupling as described in claim 1, characterized in that, The wave pressure on the bank slope is calculated as follows: In the formula, For wave pressure, As the first coefficient, For frequency conversion factors, As the second coefficient, The third coefficient, For the specific weight of water, The effective wave height.

4. The method for combined bank protection of the middle reaches of the Yangtze River under multi-source hydraulic coupling as described in claim 1, characterized in that, Based on measured rainfall data, measured water level change data, pore water pressure and wave pressure of the bank slope soil under the influence of rainfall and water level fluctuations, the horizontal displacement and safety factor of bank slopes using different combined revetment structures are calculated. This process includes the following steps: Input measured rainfall data, measured water level change data, pore water pressure and wave pressure of the bank slope under the action of rainfall and water level into the finite element software for calculation, and obtain the horizontal displacement and safety factor of the bank slope with different combination of revetment structures.

5. The method for combined bank protection of the middle reaches of the Yangtze River under multi-source hydraulic coupling as described in claim 1, characterized in that, The method for obtaining bank protection based on the clay layer thickness in the bank slope basic data and the calculated horizontal displacement and safety factor of the bank slope using different combined protection structures includes the following steps: For the same clay layer thickness, the greater the horizontal displacement of the bank slope and the smaller the safety factor, the worse the bank protection effect is.

6. A combined bank protection system for the middle reaches of the Yangtze River under multi-source hydraulic coupling, characterized in that, include: The bank slope finite element model construction module is used to build a two-dimensional finite element model of the bank slope based on the geological, hydrological, and design data of the location of the bank slope in the middle reaches of the Yangtze River; it includes: The bank slope structure information acquisition unit is used to collect basic geological and hydrological data of the bank slope, select typical bank slope profiles, and obtain the soil composition distribution of the typical bank slope profiles. The typical bank slope profiles are the most representative profiles. A unit for selecting and determining combined revetment structures is communicatively connected to the slope structure information acquisition unit. Based on the soil composition distribution of a selected typical slope profile, it determines the available combined revetment structures. The available combined revetment structures include rigid revetment structures and ecological revetment structures. The ecological revetment structures include ecological bricks and sheet piles. The rigid revetment structures are represented by precast concrete blocks. The slope and revetment structure parameter acquisition unit is communicatively connected to the slope structure information acquisition unit and the revetment structure selection and combination determination unit, and is used to acquire slope soil parameters and revetment structure parameters based on slope foundation data and slope structure design data. The bank slope model construction unit communicates with the bank slope structure information acquisition unit, the selectable combination revetment structure determination unit, and the bank slope and revetment structure parameter acquisition unit. It is used to construct a two-dimensional finite element model of the bank slope based on the selected typical bank slope profile, the selectable combination revetment structures, and the bank slope soil parameters and revetment structure parameters. The seepage law acquisition module is communicatively connected to the bank slope finite element model construction module. It is used to acquire measured rainfall data and measured water level change data and apply them as boundary conditions to the bank protection structure of the two-dimensional finite element model of the bank slope, and calculate the pore water pressure of the bank slope soil under the action of rainfall and water level fluctuation. Wave pressure acquisition unit, used to calculate and acquire wave pressure on the bank slope; The bank protection evaluation index acquisition unit is communicatively connected to the seepage law acquisition module and the wave pressure acquisition unit. It is used to calculate and obtain the horizontal displacement and safety factor of the bank slope using different combinations of bank protection structures based on the measured rainfall data, measured water level change data, pore water pressure of the bank slope soil under the action of rainfall and water level fluctuations, and wave pressure. The bank protection method acquisition module is communicatively connected to the bank protection evaluation index acquisition unit. It is used to acquire bank protection methods based on the clay layer thickness in the bank slope basic data and the horizontal displacement and safety factor of the bank slope using different combination bank protection structures.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a program for combined bank protection of the middle reaches of the Yangtze River under multi-source hydraulic coupling, wherein when the program is executed by a processor, it implements the steps of the method for combined bank protection of the middle reaches of the Yangtze River under multi-source hydraulic coupling as described in any one of claims 1 to 5.

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