Method for predicting water and soil loss of sudden change belt engineering wound surface

Abstract

The application provides a sudden change zone engineering wound surface water and soil loss amount prediction method, relates to the water and soil loss prediction technical field, and is characterized in that: the matrix cementation factor, the freeze-thaw factor and the edge angle factor are introduced, the guide formula is corrected in combination with the B-Spline function method, the sudden change zone engineering wound surface water and soil loss prediction model is obtained, the deficiency of the existing guide model in the application of the sudden change zone engineering wound surface is effectively made up, the water and soil loss prediction of the measured sudden change zone engineering wound surface is carried out through the sudden change zone engineering wound surface water and soil loss prediction model, the engineering wound surface water and soil loss amount is obtained, the problem that the existing sudden change zone engineering wound surface water and soil loss prediction result is inaccurate is solved, and the application is suitable for the sudden change zone engineering wound surface water and soil loss amount prediction.

Description

Technical Field

[0001] This invention relates to the field of soil and water loss prediction technology, and in particular to a method for predicting soil and water loss in engineering wounds in rapidly changing zones. Background Technology

[0002] Construction roads in the rapidly changing zone are characterized by long routes, large land areas, large excavation volumes, complex geological types, and diverse environmental factors. The construction of the project is accompanied by a large amount of access road excavation and filling. Under the multiple feedback coupling effects of various geological environmental factors in the rapidly changing zone, complex and variable erosion problems have emerged, resulting in great damage to the topography, soil structure and landscape ecology along the route, which poses a serious threat to the ecological, economic and social benefits of land resources.

[0003] Soil erosion prediction is a key and challenging aspect of soil and water conservation research. It is of great significance for guiding soil erosion prevention, monitoring, and ecological restoration in production and construction. Existing soil erosion data are usually predicted using guideline models. However, when using existing guideline models to predict soil erosion in rapidly changing engineering areas, the prediction results differ significantly from the actual soil erosion, and the prediction accuracy is not ideal. Summary of the Invention

[0004] The technical problem solved by this invention is to provide a method for predicting soil erosion in engineering wounds caused by rapid changes in terrain, thereby solving the problem of inaccurate prediction results of existing methods for predicting soil erosion in engineering wounds caused by rapid changes in terrain.

[0005] The technical solution adopted by this invention to solve the above-mentioned technical problems is a method for predicting soil erosion in engineering wounds caused by rapid changes in terrain, comprising the following steps:

[0006] S1. Obtain the measured soil and water loss, matrix cementation factor, freeze-thaw factor and angularity factor of different engineering wounds in the rapid change zone;

[0007] S2. Based on the B-Spline function method, the soil loss is fitted by multiplying the matrix cementation factor, freeze-thaw factor, angular angle factor and constant term on the guide formula to obtain a soil loss prediction model for the engineering wound surface of the rapid change zone.

[0008] S3. Using the soil and water loss prediction model of the engineering wound surface of the rapid change zone, the soil and water loss of the engineering wound surface under test is predicted, and the amount of soil and water loss of the engineering wound surface is obtained.

[0009] Furthermore, the matrix cementing factor was obtained from the cement dosage comparison calibration value in the rainfall experiment, and is a dimensionless constant; the freeze-thaw factor was obtained from the temperature field calculation results of the freeze-thaw test; and the angularity factor was calculated through volumetric morphology characteristics.

[0010] Furthermore, the guide formula is: ,in, This represents the amount of soil loss calculated using the guideline formula. This indicates the erosion factor of the runoff from the excavation face of the upstream waterworks. This indicates the soil composition of the excavation face of the water inlet project above. This indicates that there is a slope length factor for the excavation face of the water inlet project above. This indicates that there is a slope factor for the excavation surface of the water inlet project above. This represents the horizontal projected area of ​​the wound. This indicates the amount of soil loss due to rainfall erosion.

[0011] Furthermore, the prediction model for soil erosion in the abrupt change zone engineering wound is as follows: ,in, This represents the predicted amount of soil and water loss at the engineering site. This represents the amount of soil loss calculated using the guideline formula. This represents the matrix cementing factor. When the matrix cementing factor is between 0 and 0.01, When the matrix cementing factor is between 0.01 and 0.5, , This represents the matrix cementing factor. When the matrix cementing factor is between 0.5 and 0.99, ; This represents the freeze-thaw factor, which is between -1.13 and 0. When the freeze-thaw factor is between 0 and 1.13, , This indicates the freeze-thaw factor. When the freeze-thaw factor is between 1.13 and 2.26, ; This represents the edge angle factor term. When the edge angle factor is between 0 and 0.7, When the edge angle factor is between 0.7 and 1.5, , This represents the edge angle factor. When the edge angle factor is between 1.5 and 2.3, ; Represents a constant term. .

[0012] The beneficial effects of this invention are as follows: This invention provides a method for predicting soil erosion in engineering wounds in abruptly changing zones. By introducing matrix cementation factors, freeze-thaw factors, and angularity factors, and modifying the guideline formula using the B-Spline function method, a soil erosion prediction model for engineering wounds in abruptly changing zones is obtained. This effectively compensates for the shortcomings of existing guideline models in the application of engineering wounds in abruptly changing zones. The method predicts soil erosion in the tested abruptly changing zone engineering wounds using this model, obtaining the amount of soil erosion at the engineering wound site, thus solving the problem of inaccurate prediction results in existing methods. This method considers the impact of snowmelt and freeze-thaw processes on soil erosion and comprehensively incorporates key erosion influencing factors discovered in indoor experiments, significantly improving prediction accuracy. Compared with traditional guideline models, the prediction results of this invention are closer to the measured values, providing a more reliable scientific basis for the formulation of soil erosion prevention and control measures, dynamic monitoring, and optimization of ecological restoration schemes for engineering projects in abruptly changing zones. This helps reduce the damage to the topography, soil structure, and landscape ecology along the project route, ensuring the coordinated unity of ecological, economic, and social benefits of land resources. Attached Figure Description

[0013] Figure 1 This is a flowchart illustrating a method for predicting soil and water loss in engineering wounds caused by rapid changes in terrain, provided by the present invention. Detailed Implementation

[0014] Within a rapidly changing zone, a highway under construction spans multiple geological strata, with glacial deposits, debris flow deposits, and colluvial deposits distributed along the roadside. The complex rock types and the excavation of slopes during construction created numerous engineering wounds. Under the influence of gravity, freeze-thaw cycles, and hydraulic forces, these wounds triggered a series of erosion problems, including landslides and collapses, leading to soil erosion, exacerbating ecosystem degradation, affecting the safe operation of the highway, and hindering regional economic development. Freeze-thaw and rainfall experiments were conducted on these engineering wounds. Under freeze-thaw cycles, the mass loss and erosion / collapse caused by freeze-thaw erosion were approximately 1-1.5 times that under natural conditions. Rainfall experiments revealed that matrix cementation, angularity, stony content, and slope significantly impacted hydraulic erosion of the wounds. Particularly, matrix cementation (represented by glacial deposits) and angularity (represented by alluvial deposits) had a significant influence on erosion. Therefore, this invention prioritizes matrix cementation, angularity, and freeze-thaw cycles in predicting soil erosion at engineering wounds in rapidly changing zones.

[0015] This invention provides a method for predicting soil erosion in engineering wounds caused by rapid changes in soil conditions, such as... Figure 1 As shown, it includes the following steps:

[0016] S1. Obtain the measured soil erosion, matrix cementation factor, freeze-thaw factor, and angularity factor of different engineering wounds in the rapid change zone.

[0017] Specifically, the matrix cementing factor is taken from the cement dosage comparison calibration value in the rainfall experiment and is a dimensionless constant; the freeze-thaw factor is taken from the temperature field calculation results of the freeze-thaw test; and the angularity factor is calculated through volume morphology characteristics.

[0018] S2. Based on the B-Spline function method, the soil loss is fitted by multiplying the matrix cementation factor, freeze-thaw factor, angularity factor and constant term on the guide formula to obtain a soil loss prediction model for the engineering wound surface of the rapid change zone.

[0019] Specifically, the guideline formula is as follows: ,in, This represents the amount of soil loss calculated using the guideline formula. This indicates the erosion factor of the runoff from the excavation face of the upstream waterworks. This indicates the soil composition of the excavation face of the water inlet project above. This indicates that there is a slope length factor for the excavation face of the water inlet project above. This indicates that there is a slope factor for the excavation surface of the water inlet project above. This represents the horizontal projected area of ​​the wound. This indicates the amount of soil loss due to rainfall erosion. The total amount of water flowing per unit width above the excavation face required for calculating the runoff erosion force factor is obtained from on-site measured rainfall and runoff data. The density, silt, and clay content data required for calculating the soil quality factor are obtained from relevant tests such as particle size distribution. The slope length and slope gradient data required for calculating the slope length and slope gradient factors are obtained from on-site measurements. , This represents the total water inflow per unit width above. , Represents the natural constant. Indicates soil density. This indicates the content of powder particles (particle size 0.002–0.005 mm). This indicates the content of clay particles (particle size < 0.002 mm); , Indicates the slope length; , Indicates the slope.

[0020] To overcome the limitations of existing guideline models, this study utilizes field measurement data and extensive indoor experimental data to improve and reconstruct the current guideline model, constructing a soil erosion prediction model suitable for engineering wounds in the abrupt change zone of the study area. While maintaining a standardized calculation framework, the model's applicability and prediction accuracy are effectively improved by modifying key factors in the study area, providing crucial support for engineering construction and soil and water conservation. Specifically, using the B-Spline principle, the matrix cementation factor characteristic of the abrupt change zone (…) is modified based on the original guideline formula. ), freeze-thaw factor ( ) and edge angle factor ( This approach incorporates on-site measured values ​​as the target for approximate fitting, thereby improving the empirical formula of the guidelines. The B-Spline function is mainly implemented through Python code, using the Python Spline Transformer module and the GridSearchCV module. A grid search of 5-fold cross-validation method is used to select the optimal order and control points. After fitting based on on-site experimental data, it was found that linear fitting and two-order piecewise segmentation yielded the optimal fitting results. This resulted in a piecewise linear soil erosion prediction model based on the B-Spline function method, namely, a soil erosion prediction model for engineering wounds in rapidly changing zones, which is: , This represents the predicted amount of soil and water loss at the engineering site. This represents the amount of soil loss calculated using the guideline formula. This represents the matrix cementing factor. This represents the freeze-thaw factor. Represents the edge angle factor term. This represents a constant term.

[0021] For 37 engineering wounds in a specific abrupt change zone, 29 engineering wounds were used as sample data, and the remaining 8 engineering wounds were used as test data. The sample data were fitted, and the fitting results showed that when the matrix cementation factor was between 0 and 0.01, When the matrix cementing factor is between 0.01 and 0.5, , This represents the matrix cementing factor. When the matrix cementing factor is between 0.5 and 0.99, When the freeze-thaw factor is between -1.13 and 0, When the freeze-thaw factor is between 0 and 1.13, , This indicates the freeze-thaw factor. When the freeze-thaw factor is between 1.13 and 2.26, When the edge angle factor is between 0 and 0.7, When the edge angle factor is between 0.7 and 1.5, , This represents the edge angle factor. When the edge angle factor is between 1.5 and 2.3, ; Represents a constant term. .

[0022] For eight test data points, the above-fitted prediction model for soil erosion in abruptly changing engineering surface was used for prediction, along with existing guideline models. The prediction results and measured soil erosion amounts are shown in Table 1.

[0023] Table 1. Predicted Results and Measured Soil Erosion

[0024]

[0025] As shown in the table above, the prediction results of the soil and water loss prediction model for the engineering wound in the abrupt change zone have a very high degree of fit with the measured soil and water loss. Through Nash-Sutcliffe validity calculation, the NSE is 0.98, which is close to 1, indicating that the soil and water loss prediction model for the engineering wound in the abrupt change zone has high interpretability in the abrupt change zone area and has higher prediction accuracy than the traditional guideline model. Therefore, the above-mentioned soil and water loss prediction model for the engineering wound in the abrupt change zone can be used to predict the soil and water loss of the engineering wound in this abrupt change zone area.

[0026] S3. Using the soil and water loss prediction model of the engineering wound surface of the rapid change zone, the soil and water loss of the engineering wound surface under test is predicted, and the amount of soil and water loss of the engineering wound surface is obtained.

[0027] Specifically, by conducting freeze-thaw tests, rainfall tests, particle size analysis, and other related tests on the engineering wound surface of the rapid change zone, the parameters involved in the soil and water loss prediction model of the engineering wound surface of the rapid change zone are obtained, and the amount of soil and water loss is predicted using the soil and water loss prediction model of the engineering wound surface of the rapid change zone.

Claims

1. A method for predicting soil erosion at the wound surface of a rapidly changing engineering zone, characterized in that, Includes the following steps: S1. Obtain the measured soil and water loss, matrix cementation factor, freeze-thaw factor and angularity factor of different engineering wounds in the rapid change zone; S2. Based on the B-Spline function method, the soil loss is fitted by multiplying the matrix cementation factor, freeze-thaw factor, angular angle factor and constant term on the guide formula to obtain a soil loss prediction model for the engineering wound surface of the rapid change zone. S3. Using the soil and water loss prediction model of the engineering wound surface of the rapid change zone, the soil and water loss of the engineering wound surface under test is predicted, and the amount of soil and water loss of the engineering wound surface is obtained.

2. The method for predicting soil erosion in engineering wounds of abruptly changing zones according to claim 1, characterized in that, The matrix cementing factor was obtained from the cement dosage comparison calibration value in the rainfall experiment and is a dimensionless constant; the freeze-thaw factor was obtained from the temperature field calculation results of the freeze-thaw test; the angularity factor was calculated through volume morphology characteristics.

3. The method for predicting soil erosion in engineering wounds of abruptly changing zones according to claim 1, characterized in that, The guide formula is: ,in, This represents the amount of soil loss calculated using the guideline formula. This indicates the erosion factor of the runoff from the excavation face of the upstream waterworks. This indicates the soil composition of the excavation face of the water inlet project above. This indicates that there is a slope length factor for the excavation face of the water inlet project above. This indicates that there is a slope factor for the excavation surface of the water inlet project above. This represents the horizontal projected area of ​​the wound. This indicates the amount of soil loss due to rainfall erosion.

4. The method for predicting soil erosion in engineering wounds of abruptly changing zones according to claim 3, characterized in that, The prediction model for soil and water loss at the wound surface of the rapid change zone is as follows: ,in, This represents the predicted amount of soil and water loss at the engineering site. This represents the amount of soil loss calculated using the guideline formula. This represents the matrix cementing factor. When the matrix cementing factor is between 0 and 0.01, When the matrix cementing factor is between 0.01 and 0.5, , This represents the matrix cementing factor. When the matrix cementing factor is between 0.5 and 0.99, ; This represents the freeze-thaw factor, which is between -1.13 and 0. When the freeze-thaw factor is between 0 and 1.13, , This indicates the freeze-thaw factor. When the freeze-thaw factor is between 1.13 and 2.26, ; This represents the edge angle factor term. When the edge angle factor is between 0 and 0.7, When the edge angle factor is between 0.7 and 1.5, , This represents the edge angle factor. When the edge angle factor is between 1.5 and 2.3, ; Represents a constant term. .

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