Culvert gate construction project earthwork filling quality evaluation method and evaluation system based on real-time monitoring

Abstract

The invention discloses a sluice construction project earthwork filling quality evaluation method and evaluation system based on real-time monitoring. The method comprises the following steps that soil pressure monitoring values and changes thereof in the earthwork filling process are monitored in real time through a soil pressure meter; selecting a box culvert section as a typical position, and establishing a three-dimensional finite element model of a filled soil body; calculating the three-dimensional finite element model of the filled soil body based on finite element analysis software, and inputting preset material parameters, boundary conditions and loads to obtain a soil pressure calculation value and changes thereof in the layer-by-layer filling process; performing comparative analysis on the soil pressure calculation value and the soil pressure monitoring value, and screening out reliable soil pressure monitoring values of different soil layers; according to the conversion relation between the compaction degree and the soil pressure, compaction degree monitoring values of different soil layers are obtained through calculation; the compaction degree monitoring value is compared with the designed compaction degree, and the earthwork filling quality is evaluated. The method can provide corresponding basis and reference for management and control of earthwork filling quality by managers.

Description

Technical Field

[0001] The present application relates to the quality control of earthwork filling in culvert and sluice reconstruction projects, and specifically to a method and system for evaluating the quality of earthwork filling in culvert and sluice construction projects based on real-time monitoring. Background Art

[0002] During the construction of culverts, the earth filling project is large in volume, the construction conditions are complex, and it is greatly affected by environmental factors, which is a key link restricting the quality of project construction.

[0003] Many scholars have conducted in-depth research on earth filling construction technology during the construction period of the project. Sun Yi started from the construction principles of earth filling in water conservancy projects and explored the specific construction points of earth filling. Li Yanping introduced the practice process of earth filling construction technology in detail and pointed out the implementation effect of earth filling construction technology. Li Wei analyzed the earth filling construction and its application technology in the construction of water conservancy projects, summarized the main factors affecting the effect of earth filling construction technology in water conservancy projects, discussed the application points and difficulties of earth filling construction technology in the whole construction process, and the effective strategies to optimize the effect of technology application. Yu Daofeng analyzed the technical principles and quality control requirements of earth filling construction, pointed out the precautions for earth filling in water conservancy projects, clarified the problems in construction technology, formulated corresponding solutions, carried out supervision and management throughout the process, and eliminated safety hazards. Cui Wenming analyzed the principles of earth filling construction technology application, and pointed out that appropriate earth filling methods and construction processes should be selected according to the soil conditions in different regions and the actual conditions of the project to improve the quality of the project. Luo Heng pointed out that water conservancy project construction is characterized by scale and complexity, and the overall quality of the project is easily affected by the interference of the on-site environment. Therefore, technical control must be strengthened. Based on a water conservancy project example, he focused on the construction process and technical measures, and elaborated on the specific work points during earth filling, which ultimately ensured the overall quality of the project. Liu Hongli combined the specific farmland water conservancy dam earth filling and rolling project examples to summarize the types of filling and rolling construction technologies and application points, including the filling of the downstream rockfill area, the filling of the cushion layer and transition layer materials, the construction of the squeezed side wall and the filling of the rockfill body, and discussed the quality control content and strategy methods of the dam filling and rolling construction from many aspects such as earth excavation, filling, rolling and climate monitoring. Taking the rockfill dam construction of Zhushou Reservoir in Huili, Sichuan as an example, Li introduced an intelligent rolling system to monitor the dam filling construction process and construction technology in real time. This intelligent rolling system integrates high-precision positioning, wireless communication, high-precision sensing, and big data analysis and processing technology to provide timely and accurate rolling information to all parties involved in the construction, and can achieve full-scale control of the entire rolling construction process. This set of intelligent rolling control technology can be used as a reference for similar projects.

[0004] In summary, researchers have achieved certain research results on the quality control of earthwork excavation and filling during the construction period, but there are still some shortcomings. First, the research content is mostly about the optimization of the pre-construction plan, and there is a lack of control over the quality of earthwork filling during the construction process. If the filling construction plan does not match, it is difficult to discover and deal with it in time during the construction process, and the subsequent treatment will cause high construction costs; secondly, the degree of intelligent control is insufficient, and the existing control methods are mostly optimizations of traditional models, which still have a certain gap with the current intelligent management. Summary of the invention

[0005] In view of the shortcomings of the existing technology, the purpose of this application is to provide a method and system for evaluating the earth filling quality of culvert construction projects based on real-time monitoring, which solves the problem of lack of intelligent control of earth filling quality in existing culvert construction projects.

[0006] In a first aspect, the present application provides a method for evaluating the quality of earthwork filling in a culvert construction project based on real-time monitoring, which is characterized by comprising the following steps:

[0007] (1) Bury earth pressure gauges to monitor the earth pressure value and its changes in real time during earth filling;

[0008] (2) Select the box culvert section as a typical location and establish a three-dimensional finite element model of the fill soil;

[0009] (3) Calculating the three-dimensional finite element model of the filling soil body based on finite element analysis software, inputting preset material parameters, boundary conditions and loads, and obtaining the calculated value of the soil pressure and its change during the layer-by-layer filling process;

[0010] (4) comparing and analyzing the calculated earth pressure value of step (3) with the earth pressure monitoring value of step (1), and selecting reliable earth pressure monitoring values ​​of different soil layers;

[0011] (5) Based on the reliable soil pressure monitoring values ​​screened in step (4), compaction monitoring values ​​of different soil layers are calculated according to the conversion relationship between compaction and soil pressure;

[0012] (6) Comparing the compaction monitoring value obtained in step (5) with the design compaction; if the compaction monitoring value is greater than the design compaction, it indicates that the earth filling quality meets the design requirements; otherwise, the earth filling quality does not meet the design requirements.

[0013] In a possible implementation of the first aspect, in step (1), the earth pressure gauges are buried at the upstream wing wall, the gate pier and the box culvert.

[0014] In a possible implementation of the first aspect, the three-dimensional finite element model of the fill soil in step (2) is discretized using a hexahedral grid, a layer height is set along the height direction of the model, the model is layered along the height direction, and each layer is divided into multiple units along the height direction.

[0015] In a possible implementation of the first aspect, the specific process of calculating the three-dimensional finite element model of the fill soil body based on the finite element analysis software in step (3) is as follows:

[0016] (3.1) Importing the three-dimensional finite element model of the fill soil mass established in step (2) into the finite element analysis software;

[0017] (3.2) Input the preset material parameters, boundary conditions and loads into the finite element analysis software;

[0018] (3.3) Based on the finite element analysis software, static calculation is performed on the three-dimensional finite element model of the fill soil. During the calculation process, the calculation is performed layer by layer from the bottom to the top in the height direction, and the grids that are not involved in the calculation are set as dead units.

[0019] In a possible implementation manner of the first aspect, the material parameters include fill density, deformation modulus, Poisson's ratio, cohesion, and internal friction angle of different regions.

[0020] In a possible implementation manner of the first aspect, the boundary condition is to impose three constraints on the bottom and normal constraints on all sides.

[0021] In a possible implementation manner of the first aspect, the load is a deadweight load.

[0022] In a possible implementation of the first aspect, the specific process of comparing and analyzing the calculated earth pressure value with the monitored earth pressure value in step (4) is as follows:

[0023] (4.1) Place the monitored earth pressure values ​​and calculated earth pressure values ​​in the same coordinate system, define the x-axis as the fill elevation and the y-axis as the lateral earth pressure;

[0024] (4.2) If the error between the monitored earth pressure value and the calculated earth pressure value at the same filling elevation is within a preset threshold, the monitored earth pressure value is considered to be true and reliable.

[0025] In a possible implementation of the first aspect, the conversion relationship between the compaction degree and soil pressure of different soil layers in step (5) is as follows:

[0026]

[0027] r i =ρ di (1+wi )g;

[0028]

[0029] In the formula, K i It represents the compaction degree of the i-th layer of fill soil of the embankment within the range of Z, in %; ρ di Indicates the dry density of the i-th layer of filling soil, in kg / m 3 ρ dmax It indicates the maximum dry density of the embankment filling soil within the range of Z, in kg / m 3 ;

[0030] n represents the number of dike filling layers within the range of Z; r i Indicates the weight of the i-th layer of filling soil, in kN / m 3 ;w i represents the moisture content of the i-th layer of filling soil of the embankment within the range of Z; H i represents the thickness of the i-th layer of filling soil of the embankment within the range of Z, in m; σ z represents the soil self-weight stress, in Pa; g represents the gravity acceleration, in m / s 2 ;

[0031] k i represents the earth pressure coefficient of the i-th layer of the embankment filling soil within the range of Z; σ xi represents the soil stress in the x-direction of the i-th layer, in Pa; σ zi It represents the soil stress in the z direction of the i-th layer, in Pa.

[0032] In a second aspect, the present application provides an evaluation system for executing the earthwork filling quality evaluation method for culvert construction engineering, comprising:

[0033] The earth pressure gauge is buried at the earth pressure monitoring point to monitor the earth pressure monitoring value and its changes in real time during the earth filling process;

[0034] The model building unit builds a three-dimensional finite element model of the filling soil by selecting typical locations;

[0035] The soil pressure calculation unit is electrically connected to the model building unit; the soil pressure calculation unit calculates the three-dimensional finite element model of the filling soil body based on the finite element analysis software, and calculates the soil pressure calculation value and its change in the layer-by-layer filling process through the preset material parameters, boundary conditions and loads;

[0036] The soil pressure comparison and analysis unit is electrically connected to the soil pressure gauge and the soil pressure calculation unit; it is used to compare and analyze the soil pressure calculation value with the soil pressure monitoring value, and screen out a reliable soil pressure monitoring value;

[0037] A compaction degree calculation unit is electrically connected to the soil pressure comparison and analysis unit, and based on the reliable soil pressure monitoring value and the conversion relationship between compaction degree and soil pressure, calculates and obtains the compaction degree monitoring values ​​of different soil layers;

[0038] The earth filling quality assessment unit is electrically connected to the compaction degree calculation unit, and compares the compaction degree monitoring value with the designed compaction degree to evaluate the earth filling quality.

[0039] Compared with the prior art, this application has the following beneficial effects:

[0040] This application uses an earth pressure gauge to monitor the changes in earth pressure values ​​during earth filling in real time. Based on finite element analysis software such as ADINA, the changes in earth pressure during layer-by-layer filling are simulated, and the calculation results are compared and analyzed with real-time monitoring data to verify the reliability of the monitoring data. Based on the earth pressure monitoring data after comparing the files, the conversion relationship between earth pressure and earth compaction density is derived, and the obtained compaction density is compared with the design requirements to evaluate the earth filling quality, solving the problem of lack of intelligent control of earth filling quality in existing culvert construction projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of force analysis of different soil layers provided by the implementation method of the present application;

[0042] Figure 2 It is a kind of lateral earth pressure monitoring data at the upstream wing wall provided by the implementation method of the present application;

[0043] Figure 3 It is a kind of lateral earth pressure monitoring data at the gate pier provided by the implementation method of the present application;

[0044] Figure 4 It is a kind of lateral earth pressure monitoring data at the second section of the box culvert provided by the implementation method of this application;

[0045] Figure 5 It is a filling soil model provided by the implementation mode of the present application;

[0046] Figure 6 is a vertical displacement numerical simulation calculation result provided by an embodiment of the present application;

[0047] Figure 7 It is a numerical simulation calculation result of earth pressure provided by the implementation method of the present application;

[0048] Figure 8 It is a comparison between T3-4 monitoring data and numerical simulation calculation results provided by the implementation mode of the present application;

[0049] Fig. 9 It is a comparison between T3-3 monitoring data and numerical simulation calculation results provided by the implementation mode of the present application;

[0050] Fig.10 It is a comparison between T3-2 monitoring data and numerical simulation calculation results provided by the implementation mode of the present application;

[0051] Fig.11 It is a comparison between T3-1 monitoring data and numerical simulation calculation results provided by the implementation mode of the present application;

[0052] Fig.12 This is a situation in which the compaction degree at the position of a T3-4 earth pressure gauge changes with the filling height provided in an implementation manner of the present application. DETAILED DESCRIPTION

[0053] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0054] It should be clear that 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 the present application.

[0055] In a first aspect, the present application provides a method for evaluating the quality of earthwork filling in a culvert construction project based on real-time monitoring, comprising the following steps:

[0056] (1) Based on the characteristics of the culvert construction project, an earth pressure gauge is buried to monitor the earth pressure monitoring value and its changes (i.e. monitoring data) in real time during the earth filling process.

[0057] Optionally, the earth pressure gauges are buried in the upstream wing wall, gate pier and box culvert, with no less than 4 earth pressure gauges buried in each location along the height direction.

[0058] (2) According to the characteristics of culvert construction projects, the box culvert section was selected as a typical location and a three-dimensional finite element model of the fill soil was established;

[0059] Optionally, the three-dimensional finite element model of the filled soil body is discretized using a hexahedral grid, a layer height is set along the height direction of the model, the model is layered along the height direction, and each layer is divided into a plurality of units along the height direction. For example, the model is divided into a layer every 30 cm along the height direction, and each layer is divided into 3 units along the height direction.

[0060] (3) Based on the finite element analysis software, the preset material parameters, boundary conditions and loads are input to calculate the model, and the calculated values ​​of earth pressure and its changes during the layer-by-layer filling process (i.e., numerical simulation calculation results) are obtained; the specific process is as follows:

[0061] (3.1) Importing the three-dimensional finite element model of the fill soil mass established in step (2) into the finite element analysis software;

[0062] (3.2) Input the preset material parameters, boundary conditions and loads in the finite element analysis software; the material parameters mainly include fill density, deformation modulus, Poisson's ratio, cohesion and internal friction angle in different regions, and the boundary conditions are three constraints at the bottom and normal constraints around. The load is mainly self-weight load;

[0063] (3.3) Based on the finite element analysis software, static calculation is performed on the three-dimensional finite element model of the fill soil. During the calculation process, the calculation is performed layer by layer from the bottom to the top in the height direction, and the grids that are not involved in the calculation are set as dead units.

[0064] (4) Compare and analyze the calculated earth pressure value of step (3) with the earth pressure monitoring value of step (1); usually, it can be determined whether the error between the two is less than a preset threshold or within a preset threshold range. If so, it indicates that the earth pressure monitoring value is reliable; if the error between the two is greater than the preset threshold or exceeds the preset threshold range, the surface earth pressure monitoring value is unreliable and should be eliminated, thereby screening out reliable earth pressure monitoring values ​​of different soil layers; in a preferred embodiment, the specific process of step (4) is as follows:

[0065] (4.1) Place the monitored earth pressure values ​​and calculated earth pressure values ​​in the same coordinate system, define the x-axis as the fill elevation and the y-axis as the lateral earth pressure;

[0066] (4.2) If the error between the earth pressure monitoring value and the earth pressure calculation value at the same filling elevation is within a preset threshold, the earth pressure monitoring value can be considered to be true and reliable. For example, the threshold can be set at about 20%.

[0067] (5) Based on the reliable soil pressure monitoring values ​​screened in step (4), compaction monitoring values ​​of different soil layers are calculated according to the conversion relationship between compaction and soil pressure;

[0068] Fill earthwork consists of soil layers and groundwater with different properties and densities, such as Figure 1 According to the analysis of the stress conditions of different soil layers, the relationship between the compaction degree of different soil layers and the soil pressure is determined as follows:

[0069]

[0070]

[0071] r i =ρ di (1+w i )g (3)

[0072]

[0073] Where: n—number of dike filling layers within the range of Z; σ z —Soil self-weight stress (Pa); r i —Heavyness of the i-th layer of filling soil (kN / m 3 );H i —The thickness of the i-th layer of filling soil of the embankment within the range of Z (m); K i —Compactness of the i-th layer of filling soil of the embankment within the range of Z (%); k i —Earth pressure coefficient of the i-th layer of embankment filling soil within the range of Z; σ xi represents the soil stress in the x direction of the i-th layer (Pa); σ zi —soil stress in the i-th layer in the z direction (Pa); ρ di —Dry density of the i-th layer of filling soil (kg / m 3 );ρ dmax —Maximum dry density of embankment filling soil within the range of Z (kg / m 3 ); g—gravitational acceleration (m / s 2 );w i —The moisture content of the i-th layer of embankment fill soil within the range of Z.

[0074] According to the above-mentioned conversion relationship between soil pressure and compaction degree, if the soil pressure during earth filling can be monitored, the compaction degree of the filling soil can be confirmed. In engineering, earth pressure is usually measured using an earth pressure gauge. When the soil stress in the measured structure changes, the earth pressure gauge sensing plate synchronously senses the stress change, and the sensing plate will deform. The deformation is transmitted to the vibrating wire and converted into a change in the stress of the vibrating wire, thereby changing the vibration frequency of the vibrating wire. The electromagnetic coil excites the vibrating wire and measures its vibration frequency. The frequency signal is transmitted to the reading device via a cable, and the compressive stress value of the measured structure can be measured. The temperature value of the buried point is measured synchronously. Therefore, by burying an earth pressure box in the concrete structure near the earthwork area to monitor the earth pressure in real time, and through the conversion relationship between earth pressure and compaction degree, the degree of earth compaction can be determined in real time during the construction process, thereby monitoring the earthwork compaction degree in real time.

[0075] (6) The compaction monitoring value obtained in step (5) is compared with the design compaction. If the compaction monitoring value is greater than the design compaction, it indicates that the earth filling quality meets the design requirements. Otherwise, the earth filling quality does not meet the design requirements, thereby completing the control and evaluation of the earth filling quality.

[0076] In a second aspect, the present application provides an evaluation system for executing the earthwork filling quality evaluation method for culvert construction engineering, comprising:

[0077] The earth pressure gauge is buried at the earth pressure monitoring point to monitor the earth pressure monitoring value and its changes in real time during the earth filling process;

[0078] The model building unit builds a three-dimensional finite element model of the filling soil by selecting typical locations;

[0079] The soil pressure calculation unit is electrically connected to the model building unit; the soil pressure calculation unit calculates the three-dimensional finite element model of the filling soil body based on the finite element analysis software, and calculates the soil pressure calculation value and its change in the layer-by-layer filling process through the preset material parameters, boundary conditions and loads;

[0080] The soil pressure comparison and analysis unit is electrically connected to the soil pressure gauge and the soil pressure calculation unit; it is used to compare and analyze the soil pressure calculation value with the soil pressure monitoring value, and screen out a reliable soil pressure monitoring value;

[0081] A compaction degree calculation unit is electrically connected to the soil pressure comparison and analysis unit, and based on the reliable soil pressure monitoring value and the conversion relationship between compaction degree and soil pressure, calculates and obtains the compaction degree monitoring values ​​of different soil layers;

[0082] The earth filling quality assessment unit is electrically connected to the compaction degree calculation unit, and compares the compaction degree monitoring value with the designed compaction degree to evaluate the earth filling quality.

[0083] It should be understood that the division of the processing units in the above system is only a division of logical functions, and in actual implementation, they can be fully or partially integrated into one physical entity, or they can be physically separated. In addition, the processing units in the system can be implemented in the form of a processor calling software; for example, the system includes a processor, the processor is connected to a memory, and instructions are stored in the memory. The processor calls the instructions stored in the memory to implement any of the above methods or implement the functions of the processing units of the system, wherein the processor is a general-purpose processor, such as a central processing unit or a microprocessor, and the memory is a memory within the system or a memory outside the system.

[0084] In order to verify the feasibility and effectiveness of the present application, the following example introduces the earthwork filling quality assessment process of a culvert.

[0085] The main body of a culvert consists of an upstream connection section, a lock chamber section, a culvert section, and a downstream connection section. The design flow is 60m3 / s, the increased flow is 85m3 / s, and the designed irrigation area is 1.1 million mu. The building level is level 1, the design flood control level is 22.64m, the verification flood control level is 23.64m, and the design water diversion level in front of the gate is 13.16m. The two-unit six-hole box-type C30 reinforced concrete structure is 92.16m long and divided into 9 sections. The first section of the first section is 12.0m long, and the remaining 8 sections are each 10m long. Each hole has a net width of 3.0m and a net height of 4.0m. The bottom slope of the culvert is 1 / 300, and the top elevation of the gate bottom plate is 10.90m. The side pier thickness of the gate head section is 1.0m, the middle pier thickness is 1.2m, the seam pier thickness is 0.9m, and the gate pier top elevation is 19.10m. The working gate is a submerged flat sliding steel gate with 6 holes in total and the opening size is 3.0×4.0m. Each working gate is operated by a fixed winch hoist with a hoisting capacity of 800kN.

[0086] Earth compaction is a key control parameter for earth filling quality. In order to reflect whether the compaction meets the requirements during earth filling, combined with the key parts of earth filling quality control, earth pressure gauges are arranged at the upstream wing wall, gate pier and box culvert of the culvert. The specific locations of the earth pressure gauges are shown in Table 1.

[0087] Table 1 Earth pressure gauge instrument layout location

[0088]

[0089] The soil pressure value changes during the earth filling process were monitored in real time by using soil pressure gauges. After eliminating abnormal fluctuation points, the soil pressure monitoring conditions at each measuring point were analyzed. The monitoring results of soil pressure gauges at different elevations at the upstream wing wall, gate pier and box culvert are as follows: Figures 2 to 4 As shown. It can be seen that the lateral earth pressure at different positions gradually increases with the increase of filling elevation, which is in line with the general law.

[0090] In order to verify the accuracy of the monitoring data, this embodiment is based on the ADINA finite element analysis software, taking the fill soil at the box culvert location as the research object (the model has a length of 10m in the direction of water flow, a length of 5m in the direction perpendicular to the water flow, and a height of 14.2m in the vertical direction), and a three-dimensional finite element model is established. The model is discretized using hexahedral grids, with 113600 units and 123123 nodes. Figure 5 As shown. According to the on-site filling records, this model is divided into 48 layers, the bottom elevation of the model is 10.0m, the top elevation is 24.2m, the thickness of each layer of the 47 layers from the bottom is 30cm, a total of 3 layers of grids, the thickness of the top 48th layer is 10cm, a total of 1 layer of grids. The soil density is 1.81g / cm3, and the MC failure criterion is adopted. During the calculation process, three-way constraints are applied to the bottom and normal constraints are applied on all sides.

[0091] The finite element numerical simulation results are as follows Figure 6 to Figure 7 As shown in the figure, during the layered compaction and filling process, the maximum vertical displacement of the filled earth occurs in the middle of the filling mass, the earth pressure value gradually decreases with the increase of elevation, and the earth pressure value at the bottom is the largest, which is in line with the general law of earth filling.

[0092] Figures 8 to 11 The comparison of the monitoring data and numerical simulation data at T3-4, T3-3, T3-2 and T3-1 is given respectively. As can be seen from the figure, the numerical simulation calculation results are basically consistent with the monitoring data, indicating that the density of the soil during the earth filling process can be obtained through real-time monitoring of the earth pressure during the earth filling process, and then the soil compaction can be monitored and controlled.

[0093] After numerical simulation verification, the monitoring data at T3-4 (the soil pressure gauge at the bottom of the second box culvert) is taken as an example to compare and analyze the changes in compaction degree at this point with the filling elevation. Fig.12 As shown in the figure, the compaction degree at this position meets the design requirements along with the filling elevation, that is, by burying the earth pressure gauge, the compaction degree in the earth filling process can be monitored in real time to achieve the expected control objectives.

[0094] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A method for evaluating the earthwork quality of culvert construction projects based on real-time monitoring, characterized in that: The following steps are involved: (1) Bury earth pressure gauges to monitor the earth pressure value and its changes in real time during earth filling; (2) Select the box culvert section as a typical location and establish a three-dimensional finite element model of the fill soil; (3) Calculating the three-dimensional finite element model of the filling soil body based on finite element analysis software, inputting preset material parameters, boundary conditions and loads, and obtaining the calculated value of the soil pressure and its change during the layer-by-layer filling process; (4) comparing and analyzing the calculated earth pressure value of step (3) with the earth pressure monitoring value of step (1), and selecting reliable earth pressure monitoring values ​​of different soil layers; (5) Based on the reliable soil pressure monitoring values ​​screened in step (4), compaction monitoring values ​​of different soil layers are calculated according to the conversion relationship between compaction and soil pressure; (6) Comparing the compaction monitoring value obtained in step (5) with the design compaction; if the compaction monitoring value is greater than the design compaction, it indicates that the earth filling quality meets the design requirements; On the contrary, the quality of earth filling does not meet the design requirements.

2. The method for evaluating earthwork quality of culvert and sluice construction projects based on real-time monitoring according to claim 1 is characterized in that: In the step (1), the buried locations of the earth pressure gauges are respectively the upstream wing wall, the gate pier and the box culvert.

3. The method for evaluating earthwork quality of culvert and sluice construction projects based on real-time monitoring according to claim 1 is characterized in that: In the step (2), the three-dimensional finite element model of the backfill soil is discretized using a hexahedral grid, and a layer height is set along the height direction of the model. The model is layered along the height direction, and each layer is divided into multiple units along the height direction.

4. The method for evaluating earthwork quality of culvert and sluice construction projects based on real-time monitoring according to claim 1 is characterized in that: The specific process of calculating the three-dimensional finite element model of the fill soil body based on the finite element analysis software in step (3) is as follows: (3.1) Importing the three-dimensional finite element model of the fill soil mass established in step (2) into the finite element analysis software; (3.2) Input the preset material parameters, boundary conditions and loads into the finite element analysis software; (3.3) Based on the finite element analysis software, static calculation is performed on the three-dimensional finite element model of the fill soil. During the calculation process, the calculation is performed layer by layer from the bottom to the top in the height direction, and the grids that are not involved in the calculation are set as dead units.

5. The method for evaluating earthwork quality of culvert and sluice construction projects based on real-time monitoring according to claim 4 is characterized in that: The material parameters include fill density, deformation modulus, Poisson's ratio, cohesion and internal friction angle in different regions.

6. The method for evaluating earthwork quality of culvert and sluice construction projects based on real-time monitoring according to claim 4 is characterized in that: The boundary conditions are to impose three constraints on the bottom and normal constraints on the surrounding areas.

7. The method for evaluating earthwork quality of culvert and sluice construction projects based on real-time monitoring according to claim 4 is characterized in that: The load is the deadweight load.

8. The method for evaluating earthwork quality of culvert and sluice construction projects based on real-time monitoring according to claim 1 is characterized in that: The specific process of comparing and analyzing the calculated earth pressure value with the monitored earth pressure value in step (4) is as follows: (4.1) Place the monitored earth pressure values ​​and calculated earth pressure values ​​in the same coordinate system, define the x-axis as the fill elevation and the y-axis as the lateral earth pressure; (4.2) If the error between the monitored earth pressure value and the calculated earth pressure value at the same filling elevation is within a preset threshold, the monitored earth pressure value is considered to be true and reliable.

9. The method for evaluating earthwork quality of culvert and sluice construction projects based on real-time monitoring according to claim 1 is characterized in that: The conversion relationship between the compaction degree and soil pressure of different soil layers in step (5) is as follows: r i =ρ di (1+w i )g; In the formula, K i It represents the compaction degree of the i-th layer of fill soil of the embankment within the range of Z, in %; ρ di Indicates the dry density of the i-th layer of filling soil, in kg / m 3 ; ρ dmax It indicates the maximum dry density of the embankment filling soil within the range of Z, in kg / m 3 ; n represents the number of dike filling layers within the range of Z; r i Indicates the weight of the i-th layer of filling soil, in kN / m 3 ; w i represents the moisture content of the i-th layer of filling soil of the embankment within the range of Z; H i represents the thickness of the i-th layer of filling soil of the embankment within the range of Z, in m; σ z represents the soil self-weight stress, in Pa; g represents the gravity acceleration, in m / s 2 ; k i represents the earth pressure coefficient of the i-th layer of the embankment filling soil within the range of Z; σ xi represents the soil stress in the x-direction of the i-th layer, in Pa; σ zi It represents the soil stress in the z direction of the i-th layer, in Pa.

10. An evaluation system for executing the earthwork filling quality evaluation method for culvert construction engineering as claimed in any one of claims 1 to 9, characterized in that: include: The earth pressure gauge is buried at the earth pressure monitoring point to monitor the earth pressure monitoring value and its changes in real time during the earth filling process; The model building unit builds a three-dimensional finite element model of the filling soil by selecting typical locations; The soil pressure calculation unit is electrically connected to the model building unit; the soil pressure calculation unit calculates the three-dimensional finite element model of the filling soil body based on the finite element analysis software, and calculates the soil pressure calculation value and its change in the filling process layer by layer through the preset material parameters, boundary conditions and loads; An earth pressure comparison and analysis unit is electrically connected to the earth pressure gauge and the earth pressure calculation unit; It is used to compare and analyze the calculated earth pressure value with the earth pressure monitoring value, and screen out the earth pressure monitoring value with reliability; A compaction degree calculation unit is electrically connected to the soil pressure comparison and analysis unit, and based on the reliable soil pressure monitoring value and the conversion relationship between compaction degree and soil pressure, calculates and obtains the compaction degree monitoring values ​​of different soil layers; The earth filling quality assessment unit is electrically connected to the compaction degree calculation unit, and compares the compaction degree monitoring value with the designed compaction degree to evaluate the earth filling quality.

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