Yangtze river midstream bank slope combined bank protection method and system under multi-source hydraulic coupling effect

Abstract

The invention provides a Yangtze River midstream bank slope combined bank protection method and system under the multi-source hydraulic coupling effect. The method comprises the steps that a bank slope two-dimensional finite element model is established based on geological basic data, hydrological basic data and bank slope design data of the position where a bank slope is located; obtaining rainfall measured data and water level change measured data, applying the rainfall measured data and the water level change measured data to a bank protection structure of the bank slope two-dimensional finite element model as boundary conditions, and calculating to obtain pore water pressure; wave pressure of the bank slope is obtained through calculation; based on the rainfall measured data, the water level change measured data and the pore water pressure and the wave pressure of a bank slope soil body of the bank slope under the rainfall-water level effect, the horizontal displacement and the safety coefficient of the bank slope adopting different combined bank protection structures are calculated and obtained; and obtaining the bank slope bank protection method based on the clay layer thickness, the horizontal displacement and the safety coefficient. According to the method, the bank slope and bank protection safety conditions under the multi-source hydraulic coupling effect are considered, the accurate river bank safety condition is obtained through comparison and selection, and theoretical support is provided for bank protection selection.

Description

Technical Field

[0001] The present application relates to the technical field of bank protection engineering, and in particular to a combined bank protection method and system for the bank slopes in the middle reaches of the Yangtze River under the action of multi-source hydraulic coupling. Background Art

[0002] my country has many water systems and winding rivers. For example, the soil composition of the bank slopes in the middle reaches of the Yangtze River is mostly a binary structure, that is, the upper layer is clay and the lower layer is sand. Generally speaking, the clay cover layer is thicker and the sand cover layer is lower, and the river bank's anti-erosion ability is generally low. In recent years, the middle reaches of the Yangtze River have gradually formed a superposition effect of complex hydrological conditions and hydrological periodic fluctuations. Under the action of multi-source hydraulic coupling (such as rainfall-water level-wave force), the river bank erosion and destruction process is more complicated. For river bank collapse, bank protection projects are an effective measure to protect the bank slopes. In the construction of bank slope protection projects in the middle reaches of the Yangtze River, common bank protection projects above low water levels include gravel revetment, dry masonry stone, mortar masonry stone, bagged concrete, concrete precast blocks and other structural types; below low water levels, the slope foot protection usually adopts riprap, bagged concrete, four-sided permeable frame and other foot protection types. However, these slope protection projects and foot protection projects are very easy to be damaged under the action of multi-source hydraulic coupling, and it is difficult to take into account both ecological and safety benefits. Therefore, the rational selection of combined revetment is crucial to protecting the slope stability and ecology.

[0003] At present, there are still some deficiencies in the selection of bank slope protection in the middle reaches of the Yangtze River. The main manifestation is that the stability analysis of bank slope protection in the middle reaches of the Yangtze River mainly considers the factors of rainfall-water level-wave force, and rarely considers the influence of bank slope soil composition on bank slope stability; at the same time, the selection of bank slope protection in the middle reaches of the Yangtze River often relies too much on the relevant experience of engineers, and experience mainly serves the safety and economy of the bank slope, and it is difficult to take into account both bank slope protection and ecological benefits. Existing research focuses on bank protection structure, materials, etc., and lacks research on bank protection selection methods. Summary of the invention

[0004] The present application provides a combined bank protection method for the bank slope in the middle reaches of the Yangtze River under the action of multi-source hydraulic coupling, which can solve the technical problem existing in the prior art that both the safety benefit and the ecological benefit of the bank protection are not taken into account.

[0005] In a first aspect, the present application provides a method for combined bank protection of the bank slope in the middle reaches of the Yangtze River under the action of multi-source hydraulic coupling, comprising the following steps:

[0006] A two-dimensional finite element model of the bank slope is established based on the basic geological data, hydrological data and bank slope design data of the middle reaches of the Yangtze River.

[0007] Obtain the measured rainfall data and 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;

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

[0009] Based on the measured data of rainfall, measured data of water level change, pore water pressure of the slope soil under the action of rainfall and water level fluctuation, and wave pressure, the horizontal displacement and safety factor of the slope with different combined bank protection structures are calculated;

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

[0011] In combination with the first aspect, in one embodiment, the step of establishing a two-dimensional finite element model of the bank slope based on the basic geological data, basic hydrological data and bank slope design data of the bank slope 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 a typical bank slope section, and obtain the soil composition distribution of the typical bank slope section, wherein the typical bank slope section is the most representative section;

[0013] According to the soil composition distribution of the selected typical slope section, determine the optional combined bank protection structure;

[0014] Obtain the parameters of the bank slope soil mass and bank protection structure according to the basic data of the bank slope and the design data of the bank slope structure;

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

[0016] In combination with the first aspect, in one implementation, the optional combined bank protection structure is determined based on the soil composition distribution of the selected typical slope section, and the optional combined bank protection structure includes a rigid bank protection structure and an ecological bank protection structure.

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

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

[0019] The measured rainfall data and water level change data at the bank slope are applied as boundary conditions to the bank protection structure of the two-dimensional finite element model of the bank slope 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 combination with the first aspect, in one implementation, the wave pressure of the slope is obtained by calculation, as shown in the following formula:

[0021] P=K P K1K2K3γ w h s

[0022] Where P is the wave pressure, K1 is the first coefficient, K P is the frequency conversion coefficient, K2 is the second coefficient, K3 is the third coefficient, γ w is the bulk density of water, h s is the effective wave height.

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

[0024] The measured rainfall data, measured water level change data, pore water pressure of the slope under the action of rainfall and water level, and wave pressure are input into the finite element software for calculation to obtain the horizontal displacement and safety factor of the slope using different combined bank protection structures.

[0025] In combination with the first aspect, in one embodiment, the method for obtaining a bank slope protection method 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 specifically includes the following steps:

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

[0027] In the second aspect, the present application provides a combined bank protection system for the bank slope in the middle reaches of the Yangtze River under the action of multi-source hydraulic coupling, comprising:

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

[0029] A seepage law acquisition module is connected to the bank slope finite element model construction module for obtaining rainfall measured data and water level change measured data and applying them as boundary conditions to the bank protection structure of the two-dimensional finite element model of the bank slope, and calculating and obtaining the pore water pressure of the bank slope soil under the action of rainfall and water level fluctuation;

[0030] A wave pressure acquisition unit is used to calculate and obtain the wave pressure of the slope;

[0031] A bank protection evaluation index acquisition unit is connected to the seepage law acquisition module and the wave pressure acquisition unit for calculating and acquiring the horizontal displacement and safety factor of the bank slope using different combined bank protection structures based on the rainfall measured data, the water level change measured data, the pore water pressure of the bank slope soil under the action of rainfall and water level fluctuation, and the wave pressure;

[0032] The bank protection method acquisition module is connected to the bank protection evaluation index acquisition unit for obtaining a bank protection method 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.

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

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

[0035] A selectable combined bank protection structure determination unit is connected to the bank slope structure information acquisition unit for communication, and determines a selectable combined bank protection structure according to the soil composition distribution of the selected typical bank slope section;

[0036] A bank slope and bank protection structure parameter acquisition unit, which is in communication connection with the bank slope structure information acquisition unit and the optional combined bank protection structure determination unit, and is used to acquire bank slope soil parameters and bank protection structure parameters according to bank slope basic data and bank slope structure design data;

[0037] The bank slope model construction unit is connected to the bank slope structure information acquisition unit, the optional combined bank protection structure determination unit and the bank slope and bank protection structure parameter acquisition unit, and is used to construct a two-dimensional finite element model of the bank slope based on the selected typical profile of the bank slope, the optional combined bank protection structure, and the bank slope soil parameters and bank protection structure parameters.

[0038] In a third aspect, the present application provides a computer-readable storage medium, on which is stored a program for combined bank protection of the bank slopes in the middle reaches of the Yangtze River under the action of multi-source hydraulic coupling. When the program for combined bank protection of the bank slopes in the middle reaches of the Yangtze River under the action of multi-source hydraulic coupling is executed by a processor, the steps of the method for combined bank protection of the bank slopes in the middle reaches of the Yangtze River under the action of multi-source hydraulic coupling as described above are implemented.

[0039] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0040] This application establishes a two-dimensional finite element model based on geological and hydrological data to calculate the safety of bank slopes and revetments under the multi-source hydraulic coupling effects of rainfall, water level fluctuations and wave impacts. Through comparison, accurate riverbank safety conditions are obtained, which can take into account both the safety and ecological benefits of revetments, provide theoretical support for revetment selection, and have certain guiding significance for revetment selection and safety management. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of a specific process of the combined bank protection method for the middle reaches of the Yangtze River under the multi-source hydraulic coupling involved in the embodiment scheme of the present application;

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

[0043] Figure 3 This is a model diagram of the concrete prefabricated block revetment involved in the embodiment of the present application;

[0044] Figure 4 This is a cross-sectional view of the eco-brick bank slope model involved in the embodiment of the present application;

[0045] Figure 5 A cross-sectional view of a prefabricated concrete block bank slope model involved in the embodiment of the present application;

[0046] Figure 6 This is a schematic diagram of a steel sheet pile model involved in the embodiment of the present application;

[0047] Figure 7 A two-dimensional finite element diagram of the ecological brick-steel sheet pile combined bank slope involved in the embodiment of the present application;

[0048] Figure 8 A two-dimensional finite element diagram of a bank slope of a combination of precast concrete blocks and steel sheet piles involved in the embodiment of the present application;

[0049] Fig. 9 (a) is a schematic diagram of the calculation results of the ecological brick-steel sheet pile combined bank slope protection involved in the embodiment of the present application - horizontal displacement; Fig. 9 (b) is a schematic diagram of the calculation result and safety factor of the ecological brick-steel sheet pile combined bank slope involved in the embodiment of the present application;

[0050] Fig.10 (a) is a schematic diagram of the calculation results of the concrete prefabricated block-steel sheet pile combined revetment slope-horizontal displacement involved in the embodiment of the present application; Fig.10 (b) is a schematic diagram of the safety factor of the precast concrete block-steel sheet pile combined bank slope involved in the embodiment of the present application. DETAILED DESCRIPTION

[0051] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. 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.

[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 "first", "second" and "third" to different types.

[0053] In the description of the embodiments of the present application, "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 the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[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; the “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 the present application, multiple operations or steps that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the 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 in sequence or in parallel, and these operations or steps may be combined.

[0056] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

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

[0058] Step S1: establishing a two-dimensional finite element model of the bank slope based on the basic geological data, hydrological data and bank slope design data of the bank slope in the middle reaches of the Yangtze River;

[0059] Step S2: Obtain the measured rainfall data and the 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 and obtain the pore water pressure of the bank slope soil under the action of rainfall and water level fluctuation. In this step, the boundary conditions are input quantities, that is, the actual rainfall and the actual water level value are used as the input quantities for calculation, and are input into the two-dimensional finite element model of the bank slope for calculation, so as to obtain the pore water pressure of the bank slope soil under the action of rainfall and water level fluctuation.

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

[0061] Step S4: Based on the measured rainfall data, the measured water level change data, the pore water pressure of the slope soil under the action of rainfall and water level fluctuation, and the wave pressure, the horizontal displacement and safety factor of the slope using different combined bank protection structures are calculated;

[0062] Step S5: Obtain a bank protection method based on the thickness of the clay layer in the bank foundation data and the calculated horizontal displacement and safety factor of the bank using different combined bank protection structures.

[0063] This application establishes a two-dimensional finite element model based on geological and hydrological data to calculate the safety of bank slopes and revetments under the multi-source hydraulic coupling effects of rainfall, water level fluctuations and wave impacts. Through comparison, accurate riverbank safety conditions are obtained, which can take into account both the safety and ecological benefits of revetments, provide theoretical support for revetment selection, and have certain guiding significance for revetment selection and safety management.

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

[0065] Step S11: Collecting basic geological data and basic hydrological data of the bank slope, selecting a typical bank slope section, and obtaining the soil composition distribution of the typical bank slope section, wherein the typical bank slope section is the section that best represents the soil composition distribution of the bank slope in the middle reaches of the Yangtze River; specifically, the soil composition distribution of the bank slope in the middle reaches of the Yangtze River is basically a binary structure, that is, a two-layer soil structure, with an upper layer of clay and a lower layer of sand;

[0066] Step S12: determining the optional combined bank protection structure according to the soil composition distribution of the selected typical slope section;

[0067] Step S13: Obtaining bank slope soil parameters and bank protection structure parameters according to bank slope basic data and bank slope structure design data;

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

[0069] Based on steps S11 to 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-water level, which 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, the step S12: according to the soil composition distribution of the selected typical cross-section of the bank slope, determine the optional combined bank protection structure, the optional combined bank protection structure includes a rigid bank protection structure and an ecological bank protection structure and a combination of the rigid bank protection structure and the ecological bank protection structure; specifically, since the typical cross-section of the selected bank slope of the middle reaches of the Yangtze River is a binary structure of upper clay and lower sand, the optional combined bank protection structure needs to mainly include an ecological bank protection structure and a rigid bank protection structure, and both combined bank protection structures are based on structural support; more specifically, the ecological bank protection structure includes ecological bricks and steel sheet piles, and ecological bricks are generally suitable for terrains with gentle slopes, such as Figure 2 As shown in the figure, the cost of steel sheet piles is relatively high and will have a certain impact on the environment during construction. The representative of rigid bank protection structure is precast concrete blocks, which can reduce the erosion of the river on the bank slope and improve the stability of the bank slope, but will close the river bank and have no ecological effect. The model of precast concrete block bank protection is shown in the figure below. Figure 3 As shown, the revetment is generally carried out by combining ecological revetment structure and rigid revetment structure.

[0071] In one embodiment, the step S13: obtaining the bank slope soil parameters and the bank protection structure parameters according to the bank slope basic data and the bank slope structure design data, specifically includes the following steps:

[0072] Step S131: Calculate and obtain the soil volume moisture content θ based on the Van Genuchten model, as shown in the following formula:

[0073]

[0074] Where θ is the soil volume moisture content (cm 3 / cm 3 ), h is the pressure head (cm), θ r and θ s Represent the residual and saturated volumetric moisture contents of the soil (cm 3 / cm 3 ), α and n are empirical fitting parameters to determine the saturated / unsaturated material model;

[0075] Step S132: Based on the Mohr-Coulomb theory, the soil shear strength is calculated and obtained as shown in the following formula:

[0076]

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

[0078] Based on step S131 and step S132, the soil volume moisture content and soil shear strength of the bank slope soil are obtained, and then based on the structural design data of the bank slope and the soil volume moisture content and soil shear strength of the bank slope soil, the structural design parameters and attribute parameters such as material strength of the optional combined bank protection structure are calculated to obtain, thereby constructing a constitutive model of the combined bank protection structure.

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

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

[0081] Step S22: Apply the measured rainfall data and water level change data at the bank slope as boundary conditions to the bank slope two-dimensional finite element model with different bank protection structures. The cross-sectional view of the eco-brick bank slope model is shown in Figure 4 The cross-sectional diagram of the concrete precast block bank slope model is as follows: Figure 5 , the schematic diagram of the steel sheet pile model is as follows Figure 6, calculate and obtain the pore water pressure of the slope soil under the action of rainfall and water level fluctuation of different bank protection structures; specifically, based on the saturated seepage theory and the unsaturated seepage theory, the measured rainfall data and the measured water level change data at the location of the slope are applied to the bank protection structure of the two-dimensional finite element model of the slope, and the pore water pressure of the slope soil is obtained after the measured rainfall data and the measured water level change data are used as boundary condition data; specifically, the seepage law of the slope is calculated by finite element analysis software such as Geostudio to obtain the pore water pressure of the slope soil.

[0082] Among them, the bank protection structure is an optional combined bank protection structure. For example, the optional combined bank protection structure is an ecological brick-steel sheet pile combined bank protection structure and a concrete precast block-steel sheet pile combined bank protection structure. Then, the measured rainfall data and the measured water level change data at the location of the slope are used as boundary conditions and applied to the bank protection structures of the two-dimensional finite element models of the slopes of two different combined bank protection structures to obtain the pore water pressure of the soil of the two-dimensional finite element models of the slopes, which is used for the subsequent calculation of the bank protection safety factor and the horizontal displacement of the two combined bank protection structures.

[0083] Among them, saturated seepage means that the pores of the soil are filled with water, such as water flowing in the mud at the bottom of the river; unsaturated seepage means that the pores of the soil are not completely filled with water, such as when it rains, the soil is not completely infiltrated, and the water flow at this time is unsaturated seepage. In this application, it is necessary to consider saturated / unsaturated seepage, and then calculate the seepage law of the slope under the action of rainfall-water level, that is, the pore water pressure of the slope soil in the seepage field.

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

[0085] P=K P K1K2K3γ w h s

[0086] In the formula, P is the wave pressure, K1 is the first coefficient, K P is the frequency conversion coefficient, generally 1.35, K2 is the coefficient, generally 1.15, K3 is the coefficient, generally 2.45, γ w is the specific gravity of water (kN / m 3 ),h s is the effective wave height, L is the average wavelength (m), and m is the slope ratio.

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

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

[0089] In one embodiment, the step S5: based on the thickness of the clay layer in the basic data of the bank slope and the calculated horizontal displacement and safety factor of the bank slope using different combined bank protection structures, obtaining a bank slope protection method specifically includes the following steps:

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

[0091] In a specific embodiment, the combined bank protection method for the bank slope in the middle reaches of the Yangtze River under the action of multi-source hydraulic coupling provided in the present application is used to study the combined bank protection selection of a river channel in the middle and lower reaches of the Yangtze River. The bank slope soil composition of a river channel in the middle and lower reaches of the Yangtze River is mainly a binary structure, that is, the upper layer is clay and the lower layer is sand. Two types of bank protection are mainly used: ecological brick-steel sheet pile combined bank protection and concrete prefabricated block-steel sheet pile combined bank protection. Taking the 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 is composed of clay and sand, with a clay thickness of 7m and a sand thickness of 27.5m. The bank slope revetment structure is a combination of steel sheet pile-concrete prefabricated block revetment and steel sheet pile-ecological brick revetment. Concrete prefabricated blocks and ecological bricks are covered on the inclined bank slope; the steel sheet pile is 13.5m long, of which the part that penetrates into the bottom of the riverbed is 7.5m long, with an insertion ratio of 0.8. A total of three anchor rods are set on the back of the steel sheet pile, which are vertically inserted into the bank slope soil. Each anchor rod is 1.5m apart and 6m long.

[0092] The soil layer, concrete precast blocks and ecological bricks are simulated using the Mohr-Coulomb model, the steel sheet piles are simulated using beam units, and the anchor rods are simulated using rod units. The elastic modulus of the beam unit is 210 GPa, and the cross-sectional area is 0.002 m 2 , moment of inertia 0.005m 4 , rod unit support stiffness 50MN / m2 , pre-loaded axial force 140kN / m, Young's modulus 208Gpa. Displacement constraints are set on the left and right sides and bottom of the model, and rainfall boundary conditions are set on the top and inclined slope of the model, with rainfall intensity 0.04m / d, rainfall duration 5 days, maximum water level 31.5m, and wave force 5.8kPa.

[0093] Using the combined bank protection method for the middle reaches of the Yangtze River under the multi-source hydraulic coupling provided in this application, 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 bank protection under different slope compositions

[0095]

[0096] The calculation results of the ecological brick-steel sheet pile combined bank slope in the embodiment are shown in Fig. 9 (a)- Fig. 9 (b) shows the calculation results of the concrete prefabricated block-steel sheet pile combined bank slope in the embodiment. Fig.10 (a)- Fig.10 As shown in (b), when the clay layer of the slope is 1m, the safety factor of the concrete precast block revetment is 0.54 greater than that of the ecological brick revetment. As the thickness of the clay layer increases, the safety factors of the two revetment slopes gradually approach each other. It can be seen that when the thickness of the clay layer is less than 5m, the concrete precast block revetment has a better reinforcement effect on the slope. When the clay layer is greater than 5m, considering the ecological effect of the ecological brick revetment, it is better to use the ecological brick revetment.

[0097] It can be seen that when the thickness of the clay layer on the bank slope is lower than the preset thickness, the bank protection safety effect of the ecological brick-steel sheet pile combined bank protection structure is better; when the thickness of the clay layer on the bank slope is not lower than the preset thickness, the bank protection effect of the concrete prefabricated block-steel plate combined bank protection structure is better. In the above embodiment, the preset thickness is 5m.

[0098] In the second aspect, the present application provides a combined bank protection system for the bank slope in the middle reaches of the Yangtze River under the action of multi-source hydraulic coupling, comprising:

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

[0100] A seepage law acquisition module is connected to the bank slope finite element model construction module for obtaining rainfall measured data and water level change measured data and applying them as boundary conditions to the bank protection structure of the two-dimensional finite element model of the bank slope, and calculating and obtaining the pore water pressure of the bank slope soil under the action of rainfall and water level fluctuation;

[0101] A wave pressure acquisition unit is used to calculate and obtain the wave pressure of the slope;

[0102] A bank protection evaluation index acquisition unit is connected to the seepage law acquisition module and the wave pressure acquisition unit for calculating and acquiring the horizontal displacement and safety factor of the bank slope using different combined bank protection structures based on the rainfall measured data, the water level change measured data, the pore water pressure of the bank slope soil under the action of rainfall and water level fluctuation, and the wave pressure;

[0103] The bank protection method acquisition module is connected to the bank protection evaluation index acquisition unit for obtaining a bank protection method 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.

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

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

[0106] A selectable combined bank protection structure determination unit is connected to the bank slope structure information acquisition unit for communication, and determines a selectable combined bank protection structure according to the soil composition distribution of the selected typical bank slope section;

[0107] A bank slope and bank protection structure parameter acquisition unit, which is in communication connection with the bank slope structure information acquisition unit and the optional combined bank protection structure determination unit, and is used to acquire bank slope soil parameters and bank protection structure parameters according to bank slope basic data and bank slope structure design data;

[0108] The bank slope model construction unit is connected to the bank slope structure information acquisition unit, the optional combined bank protection structure determination unit and the bank slope and bank protection structure parameter acquisition unit, and is used to construct a two-dimensional finite element model of the bank slope based on the selected typical profile of the bank slope, the optional combined bank protection structure, and the bank slope soil parameters and bank protection structure parameters.

[0109] On the third aspect, an embodiment of the present application provides a combined bank protection device for the bank slopes in the middle reaches of the Yangtze River under the action of multi-source hydraulic coupling. The combined bank protection device for the bank slopes in the middle reaches of the Yangtze River under the action of 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 an input / output (I / O) interface, a physical interface, and a logical interface, etc., which are used to realize the interconnection of devices inside the combined bank protection equipment for the bank slope in the middle reaches of the Yangtze River under the action of multi-source hydraulic coupling, and an interface for realizing the interconnection of the combined bank protection equipment for the bank slope in the middle reaches of the Yangtze River under the action of multi-source hydraulic coupling with other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, an optical fiber interface, an ATM interface, etc.; the user device can be a display (Display), a keyboard (Keyboard), etc.

[0111] The 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 may be a general-purpose processor, which may call the combined bank protection program for the bank slope in the middle reaches of the Yangtze River under the action of multi-source hydraulic coupling stored in the memory, and execute the combined bank protection method for the bank slope in the middle reaches of the Yangtze River under the action of multi-source hydraulic coupling provided in the embodiment of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the combined bank protection program for the bank slope in the middle reaches of the Yangtze River under the action of multi-source hydraulic coupling is called may refer to the various embodiments of the combined bank protection method for the bank slope in the middle reaches of the Yangtze River under the action of multi-source hydraulic coupling of the present application, which will not be repeated here.

[0113] In a fourth aspect, an embodiment of the present application also provides a readable storage medium.

[0114] The readable storage medium of the present application stores a program for combined bank protection of the bank slopes in the middle reaches of the Yangtze River under the action of multi-source hydraulic coupling. When the program for combined bank protection of the bank slopes in the middle reaches of the Yangtze River under the action of multi-source hydraulic coupling is executed by a processor, the steps of the method for combined bank protection of the bank slopes in the middle reaches of the Yangtze River under the action of multi-source hydraulic coupling as described above are implemented.

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

[0116] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments.

[0117] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, disk, CD) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present application.

[0118] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A combined bank protection method for the middle reaches of the Yangtze River under the action of multi-source hydraulic coupling, characterized in that: The following steps are involved: A two-dimensional finite element model of the bank slope is established based on the basic geological data, hydrological data and bank slope design data of the middle reaches of the Yangtze River. Obtain the measured rainfall data and 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; Calculate and obtain the wave pressure on the slope; Based on the measured data of rainfall, measured data of water level change, pore water pressure of the slope soil under the action of rainfall and water level fluctuation, and wave pressure, the horizontal displacement and safety factor of the slope with different combined bank protection structures are calculated; Based on the thickness of the clay layer in the basic data of the slope and the calculated horizontal displacement and safety factor of the slope using different combined bank protection structures, the bank protection method is obtained.

2. The combined bank protection method for the middle reaches of the Yangtze River under the multi-source hydraulic coupling action as claimed in claim 1 is characterized in that: The method of establishing a two-dimensional finite element model of the bank slope based on the basic geological data, basic hydrological data and bank slope design data of the bank slope in the middle reaches of the Yangtze River specifically includes the following steps: Collect basic geological and hydrological data of the bank slope, select a typical bank slope section, and obtain the soil composition distribution of the typical bank slope section, wherein the typical bank slope section is the most representative section; According to the soil composition distribution of the selected typical slope section, determine the optional combined bank protection structure; Obtain the parameters of the bank slope soil mass and bank protection structure according to the basic data of the bank slope and the design data of the bank slope structure; Based on the selected typical profile of the bank slope, the optional combined bank protection structure, and the parameters of the bank slope soil and bank protection structure, a two-dimensional finite element model of the bank slope is constructed.

3. The combined bank protection method for the middle reaches of the Yangtze River under the multi-source hydraulic coupling action as claimed in claim 2 is characterized in that: The optional combined bank protection structure is determined based on the soil composition distribution of the selected typical bank slope section. The optional combined bank protection structure includes a rigid bank protection structure and an ecological bank protection structure.

4. The combined bank protection method for the middle reaches of the Yangtze River under the multi-source hydraulic coupling effect as claimed in claim 3 is characterized in that: The method of obtaining the measured rainfall data and the measured water level change data and applying them as boundary conditions to the bank protection structure of the two-dimensional finite element model of the bank slope, and calculating and obtaining the pore water pressure of the bank slope soil under the action of rainfall and water level fluctuation, specifically includes the following steps: Obtain the measured rainfall data and water level change data at the location of the slope; The measured rainfall data and water level change data at the bank slope are applied as boundary conditions to the bank protection structure of the two-dimensional finite element model of the bank slope 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.

5. The combined bank protection method for the middle reaches of the Yangtze River under the multi-source hydraulic coupling action as claimed in claim 3 is characterized in that: The wave pressure of the slope is obtained by the calculation, as shown in the following formula: P=K P K1K2K3γ w h s Where P is the wave pressure, K1 is the first coefficient, K P is the frequency conversion coefficient, K2 is the second coefficient, K3 is the third coefficient, γ w is the bulk density of water, h s is the effective wave height.

6. The combined bank protection method for the middle reaches of the Yangtze River under the multi-source hydraulic coupling action as claimed in claim 3 is characterized in that: The method of calculating and obtaining the horizontal displacement and safety factor of the bank slope using different combined bank protection structures based on the measured rainfall data, the measured water level change data, the pore water pressure of the bank slope soil under the action of rainfall and water level fluctuation, and the wave pressure specifically includes the following steps: The measured rainfall data, measured water level change data, pore water pressure of the slope under the action of rainfall and water level, and wave pressure are input into the finite element software for calculation to obtain the horizontal displacement and safety factor of the slope using different combined bank protection structures.

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

8. A combined bank protection system for the middle reaches of the Yangtze River under the action of multi-source hydraulic coupling, characterized in that: include: The bank slope finite element model building module is used to build a two-dimensional finite element model of the bank slope based on the basic geological data, hydrological data and bank slope design data of the middle reaches of the Yangtze River; A seepage law acquisition module is connected to the bank slope finite element model construction module for obtaining rainfall measured data and water level change measured data and applying them as boundary conditions to the bank protection structure of the two-dimensional finite element model of the bank slope, and calculating and obtaining the pore water pressure of the bank slope soil under the action of rainfall and water level fluctuation; A wave pressure acquisition unit is used to calculate and obtain the wave pressure of the slope; A bank protection evaluation index acquisition unit is connected to the seepage law acquisition module and the wave pressure acquisition unit for calculating and acquiring the horizontal displacement and safety factor of the bank slope using different combined bank protection structures based on the rainfall measured data, the water level change measured data, the pore water pressure of the bank slope soil under the action of rainfall and water level fluctuation, and the wave pressure; The bank protection method acquisition module is connected to the bank protection evaluation index acquisition unit for obtaining a bank protection method 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.

9. The combined bank protection system for the middle reaches of the Yangtze River under multi-source hydraulic coupling as claimed in claim 8, characterized in that: The bank slope finite element model building module includes: The bank slope structure information acquisition unit is used to collect the basic geological data and hydrological data of the bank slope, select the typical section of the bank slope, and obtain the soil composition distribution of the typical section of the bank slope, wherein the typical section of the bank slope is the most representative section; A selectable combined bank protection structure determination unit is connected to the bank slope structure information acquisition unit for communication, and determines a selectable combined bank protection structure according to the soil composition distribution of the selected typical bank slope section; A bank slope and bank protection structure parameter acquisition unit, which is in communication connection with the bank slope structure information acquisition unit and the optional combined bank protection structure determination unit, and is used to acquire bank slope soil parameters and bank protection structure parameters according to bank slope basic data and bank slope structure design data; The bank slope model construction unit is connected to the bank slope structure information acquisition unit, the optional combined bank protection structure determination unit and the bank slope and bank protection structure parameter acquisition unit, and is used to construct a two-dimensional finite element model of the bank slope based on the selected typical profile of the bank slope, the optional combined bank protection structure, and the bank slope soil parameters and bank protection structure parameters.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a program for combined bank protection of the bank slopes in the middle reaches of the Yangtze River under the action of multi-source hydraulic coupling. When the program for combined bank protection of the bank slopes in the middle reaches of the Yangtze River under the action of multi-source hydraulic coupling is executed by the processor, the steps of the method for combined bank protection of the bank slopes in the middle reaches of the Yangtze River under the action of multi-source hydraulic coupling as described in any one of claims 1 to 7 are implemented.

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