Slope protection plant selection method and system based on rainfall infiltration simulation analysis

Abstract

The invention belongs to the technical field of loess humidification deformation measurement, and provides a slope protection plant selection method and system based on rainfall infiltration simulation analysis, a rainfall capacity and infiltration depth relational expression is obtained through a simulation test, and a structure correction coefficient is introduced into the relational expression; the structure correction coefficient is a ratio of the infiltration depth determined by considering the void ratio of the soil body to the infiltration depth determined by not considering the void ratio of the soil body under the same infiltration depth; when the slope protection plants are selected, the infiltration depth, the infiltration lower interface and the like can be directly and quickly determined according to the rainfall and the relational expression of the rainfall and the infiltration depth, and powerful reference is provided for selection of the protection plants; the introduction of the structure correction coefficient realizes the consideration of the water absorption of soil particles through a simple calculation method, improves the accuracy of the relationship between the rainfall and the infiltration depth, and is beneficial to the accurate determination of the type of the protection plant.

Description

Technical Field

[0001] The present invention belongs to the technical field of loess wetting deformation measurement, and particularly relates to a method and system for selecting slope protection plants based on rainfall infiltration simulation analysis. Background Art

[0002] The main inducement of shallow landslides is that rainfall infiltration into the soil reduces the shear strength of the soil. At the same time, the surface plant roots cannot play a good anchoring role.

[0003] The research methods of rainfall infiltration mainly include numerical simulation and model tests. The current model tests mainly focus on the migration process of water in the soil, but the change of soil moisture content during the infiltration process has not been well monitored, and the lower interface of rainfall infiltration cannot be well determined, which cannot provide a strong reference for the selection of protection plants; when determining the moisture content at different depths, the absorption of water by soil particles is not considered, and there is a large error in determining the relationship between rainfall and infiltration depth, which is not conducive to the determination of protection plant types. Summary of the Invention

[0004] In order to solve the above problems, the present invention proposes a method and system for selecting slope protection plants based on rainfall infiltration simulation analysis. When selecting slope protection plants, the present invention can directly and quickly determine the infiltration depth and the lower interface of infiltration, etc. according to the rainfall and the relationship formula between rainfall and infiltration depth, providing a strong reference for the selection of protection plants; the introduction of the structure correction coefficient takes into account the absorption of water by soil particles through a simple calculation method, improving the accuracy of the relationship between rainfall and infiltration depth, and being conducive to the accurate determination of protection plant types.

[0005] In order to achieve the above object, the present invention is realized by the following technical solutions:

[0006] In the first aspect, the present invention provides a method for selecting slope protection plants based on rainfall infiltration simulation analysis, including:

[0007] Obtain the rainfall;

[0008] According to the rainfall and a preset infiltration depth solution model, obtain the infiltration depth of rainwater in the soil; wherein, the infiltration depth solution model is a relationship formula between rainfall and infiltration depth obtained through simulation tests; a structure correction coefficient is introduced on one side of the relationship formula, and the structure correction coefficient is the ratio of the infiltration depth determined considering the soil porosity and crystal water to the infiltration depth determined without considering the soil porosity and crystal water at the same infiltration depth;

[0009] Select slope protection plants according to the infiltration depth and the state of plant roots.

[0010] Further, the infiltration depth solution model:

[0011]

[0012] Among them, K is the structural correction coefficient; ρ d is the dry density; h is the depth of saturated moisture content; h i is the depth of the i-th isohyet; x is the integration object; ω sat is the saturated moisture content; ω i (h) is the moisture content of the i-th isohyet; l is the width of the model box; m is the number of isohyets.

[0013] Furthermore, the structural correction coefficient K at each depth is:

[0014]

[0015] Among them, W_jie is the crystal water; n is the void ratio of the soil; n i is the void ratio of the soil at the corresponding moisture content.

[0016] Furthermore, the crystal water is:

[0017]

[0018] Among them, m 1 and V are the mass and volume of the eroded soil respectively; m 2 is the weighing of the dried eroded soil.

[0019] Furthermore, if the maximum infiltration depth is greater than the preset depth, then taproot plants are selected; otherwise, fibrous root plants are selected.

[0020] Furthermore, during the simulation test, rainfall simulation is carried out, and the total rainfall amount is recorded and the runoff rainfall amount is measured; the mass and volume of the eroded soil are weighed, and the mass of the dried eroded soil is weighed; during the rainfall process, the moisture content at different positions of the soil is recorded in real time, and the change diagram of the moisture content at each position with time is drawn; after the rainfall ends, the final moisture content of each monitoring point is determined, the saturated moisture content depth line is obtained, and the change diagram of the moisture content with depth at the saturated moisture content depth is drawn.

[0021] In a second aspect, the present invention also provides a slope protection plant selection system based on rainfall infiltration simulation analysis, including:

[0022] A data acquisition module, configured to: obtain the rainfall amount;

[0023] The infiltration depth determination module is configured to: obtain the infiltration depth of rainwater in the soil body according to the rainfall amount and a preset infiltration depth solution model; wherein, the infiltration depth solution model is a relationship between rainfall amount and infiltration depth obtained through simulation tests; a structure correction coefficient is introduced on one side of the relationship, and the structure correction coefficient is the ratio of the infiltration depth determined considering the soil porosity ratio and crystal water to the same infiltration depth determined without considering the soil porosity ratio and crystal water.

[0024] The selection module is configured to: select slope protection plants according to the infiltration depth and the state of plant roots.

[0025] In a third aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the steps of the slope protection plant selection method based on rainfall infiltration simulation analysis described in the first aspect are implemented.

[0026] In a fourth aspect, the present invention further provides an electronic device, including a memory, a processor, and a computer program stored on the memory and capable of running on the processor. When the processor executes the program, the steps of the slope protection plant selection method based on rainfall infiltration simulation analysis described in the first aspect are implemented.

[0027] In a fifth aspect, the present invention further provides a computer program product, the computer program product includes a computer program, and when the computer program is executed by a processor, the steps of the slope protection plant selection method based on rainfall infiltration simulation analysis described in the first aspect are implemented.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] 1. In the present invention, a relationship between rainfall amount and infiltration depth is obtained through simulation tests, and a structure correction coefficient is introduced into the relationship; the structure correction coefficient is the ratio of the infiltration depth determined considering the soil porosity ratio and crystal water to the same infiltration depth determined without considering the soil porosity ratio and crystal water; when selecting slope protection plants, the infiltration depth and the lower interface of infiltration can be directly and quickly determined according to the rainfall amount and the relationship between rainfall amount and infiltration depth, providing a strong reference for the selection of protection plants; the introduction of the structure correction coefficient realizes the consideration of water absorption by soil particles through a simple calculation method, improves the accuracy of the relationship between rainfall amount and infiltration depth, and is beneficial to the accurate determination of the type of protection plants.

[0030] 2. In the present invention, a relationship curve between the amount of rainwater infiltrated into the soil body and the depth of different water contents is established, realizing the monitoring of the soil water content, providing a basis for the change of the water content of the surface landslide under rainfall conditions, and facilitating the selection of plants for preventing landslides. Description of the Drawings

[0031] The accompanying drawings forming a part of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments and descriptions thereof of this embodiment are used to explain this embodiment and do not constitute an improper limitation to this embodiment.

[0032] Figure 1 Schematic diagram of the model test device for Embodiment 1 of the present invention;

[0033] Figure 2 Schematic diagram of the water content distribution of the soil sample for Embodiment 1 of the present invention;

[0034] Figure 3 Schematic diagram of the plant root types for Embodiment 1 of the present invention. Detailed implementation manners

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0036] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further explanations for this application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0037] Embodiment 1:

[0038] This embodiment provides a method for selecting slope protection plants based on rainfall infiltration simulation analysis, and a portable loess humidification deformation measuring device for realizing simulation tests and slope protection plant selection methods.

[0039] As Figure 1 shown, the measuring device includes a model box. Optionally, the model box is an open cube made of transparent acrylic plates. One side of the model box is semi-open and extends outwards to form a runoff channel. A filter screen is provided at the end of the runoff channel to filter sand and gravel in the runoff; a collector is provided below the filter screen to collect the runoff rainfall; when loading the soil body in the model box, moisture content monitors are buried in layers, such as soil moisture measuring instruments, to monitor the moisture content at different infiltration depths; according to the actual working conditions, it is selected whether to set a slope at the top of the soil body; the top of the model box is a rainfall simulation sprinkler, and the sprinkler distribution scheme should be selected according to the rainfall type. The rainfall simulation sprinkler can be realized by a conventional sprinkler head, and the sprinkler head is connected to a water supply device through a pipeline, which will not be elaborated here.

[0040] Specifically, first, according to the actual working conditions or research requirements, the rainfall intensity and the slope of the soil body are given, and the graded slopes can be carried out, such as 30° - 60°; then, the soil body is added and the moisture content monitors are buried in layers, and the distance between the moisture content monitors in each layer should not be greater than 5 cm; after the soil slope is formed, according to the rainfall intensity, the rainfall sprinkler distribution scheme is set, and the rainfall device can use an artificial rainfall simulator, and the spraying device can control the size and intensity of the rain droplets.

[0041] After the measurement device is assembled, rainfall simulation is carried out within a certain period of time, and the total amount of water W used for rainfall is recorded. 1 The runoff rainfall enters the collector through the runoff channel. After the rainfall ends and there is no more runoff, the runoff rainfall W in the collector is measured. 2 The mass m of the filtered soil (i.e., the eroded soil mass) is weighed. 1 And its volume V, then this part of the soil mass is dried and weighed as m. 2 During the rainfall process, the data of the moisture content monitor is recorded in real time, and the change graph of the moisture content ω-t of each monitor with time is drawn; after the rainfall ends and the infiltration is stable (the readings of each moisture content monitor are stable), the final moisture content of each monitoring point is determined, the saturation moisture content depth line is drawn, and according to the principle of the triangular network method, the change graph of the moisture content ω-h with depth under the saturation moisture content depth is drawn.

[0042] Based on the above experiments, the total amount of water W used for rainfall is obtained. 1 The runoff rainfall W 2 and the ω-h graph, then the amount of water infiltrating into the soil mass during rainfall has the following formula:

[0043]

[0044] where ρ d is the dry density, which refers to the mass of solid particles per unit volume of the soil mass in the dry state; h is the saturation moisture content depth; h i is the depth of the i-th equal moisture content line; x is the integration object; ω sat is the saturation moisture content; ω i (h) is the moisture content of the i-th equal moisture content line; l is the width of the model box, and m is the number of equal moisture content lines. By using the model box to conduct experiments with different rainfall amounts and different slopes, the relationship between the rainfall amount and the infiltration depth can be constructed from a macroscopic perspective.

[0045] Water in the soil mass mainly exists in the forms of crystal water and free water. Free water mainly exists in the pores of the soil mass, and crystal water is the water absorbed by soil particles. Without considering water loss, the amount of water infiltrating into the soil mass during rainfall has the following formula:

[0046]

[0047] where W 结 is the crystal water; n is the porosity ratio of the soil mass; n i is the porosity ratio of the soil mass at the corresponding moisture content. W 结 can be obtained through the eroded soil mass:

[0048]

[0049] The model box is used for tests with different rainfall amounts and slopes. According to Formula 2, the relationship among rainfall amount, soil pores, and infiltration depth can be constructed from a microscopic perspective.

[0050] From a microscopic perspective, the relationship among rainfall amount, soil pores, and infiltration depth can be constructed through Formula 2, which is more comprehensive and accurate than Formula 1. However, it introduces the void ratio under different water contents, resulting in a complex calculation process and an increase in the amount of tests. Therefore, Formula 1 is modified to obtain the infiltration depth solution model:

[0051]

[0052] Among them, K is the structure correction coefficient. First, the relationship between rainfall amount and infiltration depth is determined using Formula 1, and the relationship among rainfall amount, soil pores, and infiltration depth is determined using Formula 2. Then, at the same infiltration depth, let:

[0053] The relationship between rainfall amount, soil pores, and infiltration depth is determined using Formula 2. Then, at the same infiltration depth, let:

[0054]

[0055] In this way, the structure correction coefficient K at each depth can be obtained:

[0056]

[0057] The same effect as Formula 2 can be obtained through Formula 1. Based on this, when the soil properties are certain, the water infiltration depth under different rainfall conditions can be predicted.

[0058] As Figure 3 shown, the root systems of plants can be divided into taproot systems (such as dandelions, etc.) and fibrous root systems (such as foxtail grass, hyacinths, etc.). Generally, the taproot system has a longer main root, underdeveloped lateral roots, and a longer root system; the fibrous root system plants have an underdeveloped main root, mainly adventitious roots, and a shorter root system.

[0059] For the root system of plants to be able to play an anchoring role in landslides, as Figure 2 shown, the root system of plants needs to penetrate a certain distance beyond the maximum infiltration depth line. If the maximum infiltration depth line is deeper, such as greater than the preset depth, it is advisable to select plants with taproot systems to anchor the soil; if it is shallower, such as not greater than the preset depth, it is advisable to select plants with fibrous root systems to absorb water while anchoring the soil.

[0060] Taproots have a relatively long main root, underdeveloped lateral roots, and a relatively long root system; fibrous root system plants have an underdeveloped main root, mainly adventitious roots, and a relatively short root system. For the plant root system to be able to anchor a landslide, the plant roots need to penetrate a certain distance through the maximum infiltration depth line. Here, it is advisable to choose taproot plants with relatively developed main roots. For slope protection, plants with good water absorption should also be planted. At this time, fibrous root system plants have well-developed adventitious roots and good water absorption effects. The fibrous root system plants can play a better role only when their roots are longer than the saturation moisture content line; if there are no fibrous root system plants with long roots, a mixed method of "planting fibrous root system plants on the surface + plants with medium-length roots" can be adopted. The lateral roots of plants with medium-length roots are mainly distributed at a certain depth moisture content line (between the natural moisture content and the saturation moisture content).

[0061] When treating landslides, according to the specification requirements, rainfall data for a certain number of years in the local area are retrieved, and different rainfall amount model tests are carried out. According to the relationship between rainfall amount and infiltration depth, the maximum infiltration depth is selected, and appropriate plants can be selected based on the maximum infiltration depth.

[0062] Through this embodiment, a relationship curve between (W 1 -W 2 ) and different moisture content depths h i can be established, providing a basis for the change of surface landslide moisture content under rainfall conditions, and facilitating the selection of plants for preventing and controlling landslides (plant roots > moisture content lower interface).

[0063] Embodiment 2:

[0064] This embodiment provides a slope protection plant selection system based on rainfall infiltration simulation analysis, including:

[0065] A data acquisition module, configured to: obtain the rainfall amount;

[0066] An infiltration depth determination module, configured to: obtain the infiltration depth of rainwater in the soil mass according to the rainfall amount and a preset infiltration depth solution model; wherein, the infiltration depth solution model is a relationship formula between rainfall amount and infiltration depth obtained through simulation tests; a structural correction coefficient is introduced on one side of the relationship formula, and the structural correction coefficient is the ratio of the infiltration depth determined considering the soil porosity and crystal water to the infiltration depth determined without considering the soil porosity and crystal water at the same infiltration depth;

[0067] A selection module, configured to: select slope protection plants according to the infiltration depth and the state of plant roots.

[0068] The working method of the system is the same as that of the slope protection plant selection method based on rainfall infiltration simulation analysis in Embodiment 1, and will not be elaborated here.

[0069] Embodiment 3:

[0070] This embodiment provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the steps of the method for selecting slope protection plants based on rainfall infiltration simulation analysis described in Embodiment 1 are implemented.

[0071] Embodiment 4:

[0072] This embodiment provides an electronic device, including a memory, a processor, and a computer program stored on the memory and capable of running on the processor. When the processor executes the program, the steps of the method for selecting slope protection plants based on rainfall infiltration simulation analysis described in Embodiment 1 are implemented.

[0073] Embodiment 5:

[0074] This embodiment provides a computer program product. The computer program product includes a computer program. When the computer program is executed by a processor, the steps of the method for selecting slope protection plants based on rainfall infiltration simulation analysis described in Embodiment 1 are implemented.

[0075] The above are only the preferred embodiments of this embodiment and are not used to limit this embodiment. For those skilled in the art, various changes and modifications can be made to this embodiment. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this embodiment shall be included within the protection scope of this embodiment.

Claims

1. A slope protection plant selection method based on rainfall infiltration simulation analysis, characterized in that: include: Get rainfall amount; According to the rainfall and the preset infiltration depth solution model, the infiltration depth of rainwater in the soil is obtained; wherein the infiltration depth solution model is a relationship between rainfall and infiltration depth obtained through simulation test; a structural correction coefficient is introduced on one side of the relationship, and the structural correction coefficient is the ratio of the infiltration depth determined by considering the porosity ratio and crystal water of the soil to the same infiltration depth determined without considering the porosity ratio and crystal water of the soil; Select slope protection plants based on the infiltration depth and the condition of the plant roots.

2. The method for selecting slope protection plants based on rainfall infiltration simulation analysis according to claim 1, characterized in that: Infiltration depth solution model: Where K is the structural correction coefficient; ρ d is the dry density; h is the saturated moisture content depth; h i is the depth of the ith line of equal water content; x is the integral object; ω sat is the saturated moisture content; ω i (h) is the moisture content of the i-th line of equal moisture content; l is the width of the model box; m is the number of lines of equal moisture content; W1 is the total rainfall; W2 is the runoff rainfall.

3. The method for selecting slope protection plants based on rainfall infiltration simulation analysis according to claim 2, characterized in that: The structural correction coefficient K at each depth is: Where W is the crystal water; n is the porosity of the soil; n i is the porosity ratio of soil at the corresponding water content.

4. The method for selecting slope protection plants based on rainfall infiltration simulation analysis according to claim 3 is characterized in that: The crystal water is: Among them, m1 and V are the mass and volume of the eroded soil, respectively; m2 is the weight of the dried eroded soil.

5. The method for selecting slope protection plants based on rainfall infiltration simulation analysis according to claim 1, characterized in that: If the maximum infiltration depth is greater than the preset depth, taproot plants are selected; otherwise, fibrous root plants are selected.

6. The method for selecting slope protection plants based on rainfall infiltration simulation analysis according to claim 1, characterized in that: During the simulation test, rainfall simulation was carried out, and the total rainfall water volume and runoff rainfall were recorded; the mass and volume of the eroded soil were weighed, and the mass of the dried eroded soil was weighed; during the rainfall process, the moisture content at different positions of the soil was recorded in real time, and a graph showing the change of moisture content at each position over time was drawn; after the rainfall ended, the final moisture content of each monitoring point was determined, the saturated moisture content depth line was obtained, and a graph showing the change of moisture content with depth at the saturated moisture content depth was drawn.

7. The slope protection plant selection system based on rainfall infiltration simulation analysis is characterized by: include: The data acquisition module is configured to: obtain rainfall; The infiltration depth determination module is configured to: obtain the infiltration depth of rainwater in the soil according to the rainfall and a preset infiltration depth solution model; wherein the infiltration depth solution model is a relationship between rainfall and infiltration depth obtained through simulation tests; a structural correction coefficient is introduced into one side of the relationship, and the structural correction coefficient is a ratio of the infiltration depth determined by considering the porosity ratio and crystal water of the soil to the same infiltration depth determined without considering the porosity ratio and crystal water of the soil; The selection module is configured to select slope protection plants according to the infiltration depth and the state of the plant roots.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the slope protection plant selection method based on rainfall infiltration simulation analysis as described in any one of claims 1 to 6 are implemented.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, characterized in that: When the processor executes the program, the steps of the slope protection plant selection method based on rainfall infiltration simulation analysis as described in any one of claims 1 to 6 are implemented.

10. A computer program product, characterized in that The computer program product includes a computer program, and when the computer program is executed by a processor, the steps of the slope protection plant selection method based on rainfall infiltration simulation analysis as described in any one of claims 1 to 6 are implemented.

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