Slope reinforcement method based on artificial guiding of root distribution

Abstract

This application provides a slope reinforcement method based on artificially guided root distribution, belonging to the technical field of slope protection. The method includes: investigating the target slope to determine the dominant load type; determining a first root distribution ratio suitable for the target slope based on the dominant load type and predetermined root distribution ratios that are optimal for both static and dynamic soil-fixing strength; and implementing slope reinforcement work according to the first root distribution ratio. This technical solution, by determining the root distribution ratio of slope vegetation based on load type for reinforcement work, is a targeted slope reinforcement method that facilitates better slope reinforcement results.

Description

Technical Field

[0001] This application relates to the field of slope protection, specifically to a slope reinforcement method based on artificially guided root distribution. Background Technology

[0002] Slope protection refers to the reinforcement and protection of naturally or artificially formed slopes to prevent instability, landslides, collapses, and other disasters. In practical applications, ecological protection is an important slope protection method. It utilizes the reinforcing and anchoring effects of plant roots to enhance slope stability and improve the ecological environment. This method combines relevant technologies from geotechnical engineering and ecological engineering, falling within the technical scope of forestry research. Specifically, slope stability is closely related to soil strength, and plant roots significantly enhance soil strength through the reinforcing effect of shallow, fine roots and the anchoring effect of coarse, deep roots. The anchoring effect of deep roots is particularly important in debris slopes.

[0003] Currently, there are already practical applications of technologies for artificially guiding root growth (e.g., the guide tube device and its construction method mentioned in the previous patent application CN108811874A). However, during the development of this invention, the inventors discovered that plant root structures are complex and their growth directions are irregular, and their distribution characteristics can affect the shear strength of the soil in which the roots are located. With the acceleration of urbanization and the development of infrastructure construction, engineering environments face more and more dynamic load problems (such as earthquakes, traffic vibrations, and mechanical vibrations). These loads not only threaten the stability of the soil but may also affect root growth and its reinforcement effect. In existing technologies, the implementation of root guidance only roughly ensures that the roots are located below the slope or potential landslide body, without fully considering the quantitative allocation and optimization of the guidance direction, which is not conducive to achieving the best reinforcement effect. Summary of the Invention

[0004] To overcome at least some of the problems existing in related technologies, this application provides a slope reinforcement method based on artificially guided root distribution. In actual engineering implementation, the applicability under dynamic load conditions and the quantitative analysis of root distribution characteristics are considered to achieve better slope reinforcement effect.

[0005] Some embodiments of this application provide a slope reinforcement method based on artificially guided root distribution, the method comprising:

[0006] Investigate the target slope to determine the dominant load type of the slope;

[0007] Based on the dominant load type, and according to the predetermined root arrangement ratios for the optimal static strength and dynamic strength of root soil consolidation, respectively, a first root arrangement ratio applicable to the target slope is determined.

[0008] The slope reinforcement project will be implemented according to the first root system distribution ratio.

[0009] In one possible implementation, the dominant load type includes static load type and dynamic load type;

[0010] When the target slope is a static load type, the root arrangement ratio that is optimal for the static strength of root system soil stabilization will be determined as the first root arrangement ratio.

[0011] When the target slope is subject to dynamic load, the root arrangement ratio that is optimal for the dynamic strength of root system soil stabilization is determined as the first root arrangement ratio.

[0012] In one possible implementation, the dominant load type further includes a composite load type; when the target slope belongs to the composite load type, the first root system distribution ratio is calculated and determined based on the following expression:

[0013]

[0014] in, This indicates the proportion of the first root system. This represents the optimal root arrangement ratio for achieving the static strength of soil stabilization through root system reinforcement. This represents the optimal root arrangement ratio for improving the dynamic strength of root system soil fixation. This indicates the proportion of static load acting on the target slope determined by the survey.

[0015] In one possible implementation, the optimal root arrangement ratios for both static and dynamic soil-stabilizing strength are predetermined based on root-stabilizing tests; the predetermined process includes:

[0016] Determine the range of root orientation values ​​for the target plant;

[0017] Based on the range of root orientation values, typical values ​​of root distribution are determined, and root-soil composite samples of corresponding types are prepared according to each typical value.

[0018] Based on the root-soil composite sample, a triaxial compression test was conducted to determine the shear strength of the sample, and a dynamic triaxial test was conducted to determine the dynamic stress amplitude corresponding to the liquefaction state of the sample.

[0019] Using statistical methods, the optimal root arrangement ratio for static soil stabilization was determined based on the experimental data from triaxial compression tests, and the optimal root arrangement ratio for dynamic soil stabilization was determined based on the experimental data from dynamic triaxial tests.

[0020] In one possible implementation, the process of determining the range of root orientation values ​​for the target plant includes:

[0021] Root samples from multiple undisturbed plants were obtained in the study area using an excavation method.

[0022] The root system samples are scanned using a root scanner. The root aspect ratio of each sample is calculated based on the scan data. The minimum and maximum root aspect ratios are then linearly expanded to determine the range of root orientation values.

[0023] One possible implementation involves linear range expansion based on the following expression:

[0024]

[0025]

[0026] in, This indicates the lower limit of the range of root orientation values. This represents the upper limit of the range of root orientation values. This represents the minimum root system aspect ratio. This represents the maximum root system aspect ratio. This represents the coefficient of dispersion.

[0027] In one possible implementation, the typical value of the root distribution is determined using the logarithmic space equidistant method based on the range of root orientation values.

[0028] In one possible implementation, the use of statistical methods specifically includes:

[0029] Based on the experimental data, the mapping relationship between root distribution ratio and shear strength, and the mapping relationship between root distribution ratio and dynamic stress amplitude were fitted. The extreme points of the curves corresponding to the fitted mapping relationships were determined. The root distribution ratio values ​​corresponding to the extreme points were determined as the optimal root distribution ratio for static soil stabilization and the optimal root distribution ratio for dynamic soil stabilization.

[0030] One possible implementation method is to carry out slope reinforcement projects by setting up root guide tubes.

[0031] In one possible implementation, the root guide tube includes straight guide tubes and diversion guide tubes, and the growth of lateral roots is guided by placing a substrate containing growth hormone into the diversion guide tube at the end.

[0032] The slope reinforcement method based on artificially guided root distribution provided in this application includes: investigating the target slope and determining the dominant load type of the slope; based on the dominant load type, determining a first root distribution ratio suitable for the target slope according to pre-determined root distribution ratios that are optimal for both static and dynamic soil-fixing strength; and implementing the slope reinforcement project according to the first root distribution ratio. In this application's technical solution, by determining the dominant load type of the target slope and then determining the root distribution ratio of the slope greening plants based on the load type for reinforcement project implementation, this targeted slope reinforcement method is beneficial for achieving better slope reinforcement results.

[0033] Other advantages, objectives, and features of this application will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from an examination of the following, or may be learned from the practice of the invention. Attached Figure Description

[0034] The accompanying drawings are used to provide a further understanding of the technical solutions of this application or the prior art, and constitute a part of the specification. The drawings illustrating embodiments of this application, together with the embodiments of this application, are used to explain the technical solutions of this application, but do not constitute a limitation on the technical solutions of this application.

[0035] Figure 1 This is a schematic flowchart illustrating a slope reinforcement method based on artificially guided root distribution in one embodiment of this application.

[0036] Figure 2 This is a schematic diagram illustrating the root soil stabilization test in one embodiment of this application;

[0037] Figure 3 This is a schematic diagram illustrating the structure of the root guide tube in one embodiment of this application.

[0038] In the figure, 31-straight guide tube; 31a-crack strip; 32-diversion guide tube; 32a-hormone sustained-release chamber; 33-exchange hole. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be described in detail below. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] As described in the background section, there are already practical applications of technologies for artificially guiding root growth (e.g., the guide tube device and its construction method mentioned in the previous patent application CN108811874A). However, during the development of this invention, the inventors discovered that plant root structures are complex and their growth directions are irregular, and their distribution characteristics can affect the shear strength of the soil in which the roots are located. With the acceleration of urbanization and the development of infrastructure construction, engineering environments face more and more dynamic load problems (such as earthquakes, traffic vibrations, and mechanical vibrations). These loads not only threaten the stability of the soil but may also affect root growth and its reinforcement effect. In the prior art, the implementation of root guidance only roughly ensures that the roots are located below the slope or potential landslide body, without fully considering the quantitative allocation and optimization of the guidance direction, which is not conducive to achieving the best reinforcement effect.

[0041] Based on this, this application proposes a slope reinforcement method based on artificially guided root distribution. In actual engineering implementation, the applicability under dynamic load conditions and the quantitative analysis of root distribution characteristics are considered to achieve better slope reinforcement effect.

[0042] In one embodiment, such as Figure 1 As shown, the slope reinforcement method based on artificially guided root distribution proposed in this application includes:

[0043] Step S110 involves investigating the target slope to determine its dominant load type. This step, as is easily understood, requires a comprehensive and detailed investigation of the target slope to accurately identify and determine its dominant load type, providing the necessary basis for subsequent engineering design. In practice, this investigation can be conducted by combining data collection with on-site surveys. Special attention should be paid to whether there are any human activities (such as building construction or road construction) or potential power sources (such as traffic vibration or mechanical vibration) in the surrounding environment of the slope.

[0044] Based on the survey information, the dominant load type is then determined. In this technical solution, considering the actual engineering conditions, the dominant load types include static load types, dynamic load types, and combined load types. These are briefly described below:

[0045] Static load type refers to slope scenarios dominated by static loads. These scenarios are characterized by long-term stability control, such as situations involving rainfall infiltration and natural slope slippage. The engineering requirements are to improve shear strength and prevent slow shear failure.

[0046] Dynamic load type, namely slope scenario dominated by dynamic load. The characteristic of this scenario is that it is frequently affected by dynamic loads such as trains, high-speed rail, and automobiles. The engineering requirements are to improve the dynamic modulus, resistance to dynamic strain, and prevent fatigue damage and instantaneous slippage.

[0047] Composite load type refers to a composite slope scenario where static and dynamic loads act together. Typical scenarios include high-speed railway slopes and slopes with combined effects such as highways and rainfall. The engineering requirements are to comprehensively consider strength and vibration resistance.

[0048] After step S110 is completed, step S120 can be performed. Based on the dominant load type, according to the pre-determined root arrangement ratios that are optimal for both static and dynamic soil stabilization, the first root arrangement ratio applicable to the target slope is determined. The core of this step is to select the most suitable root arrangement ratio for the identified dominant load type in order to achieve the best soil stabilization effect.

[0049] It is readily understood by those skilled in the art that the root system arrangement ratio here refers to the ratio of horizontal to vertical roots in the plant root system. For different slope protection plants, the soil-fixing performance of different plants with the same root system arrangement ratio is generally different. Therefore, the root system arrangement ratios mentioned above for the optimal static and dynamic soil-fixing strength of the root system are all for the plant species to be implemented in the project. Given the limited number of common ecological slope protection plant species, the root system arrangement ratio data corresponding to these plant species for the optimal static and dynamic soil-fixing strength of the root system can be predetermined (as determined in this application based on specific geotechnical tests). Then, in the implementation of the project, based on the determined dominant load type, the first root system arrangement ratio is determined according to the root system arrangement ratio data corresponding to the slope protection plant to be used.

[0050] Specifically, in this application, when the target slope is subject to static load, the root arrangement ratio that is optimal for the static strength of root system soil stabilization is determined as the first root arrangement ratio; that is, if the preliminary investigation and analysis confirm that the main threat to the target slope comes from static load, then those root arrangement ratios that can maximize the soil's shear resistance should be selected. Such root arrangement structures usually have a deeper rooting depth and a wider lateral extension, which helps to enhance the overall stability and bearing capacity of the soil.

[0051] When the target slope is subject to dynamic load, the root arrangement ratio that is optimal for the dynamic strength of the root system to stabilize the soil will be determined as the first root arrangement ratio. In other words, if the investigation and analysis show that dynamic load (such as traffic vibration) is the main factor affecting slope stability, a root arrangement scheme that can effectively absorb and disperse vibration energy is needed to improve the soil's ability to resist periodic stress.

[0052] When the dominant load type of the target slope is a composite load type, it means that the target slope is not only affected by static load, but also by dynamic load. In this case, it is not enough to consider the influence of a single type of load. It is necessary to comprehensively evaluate and deal with the combined effect of the two types of loads to ensure that the selected root system distribution ratio can provide the best soil stabilization effect. In actual engineering practice, the first root system distribution ratio can be determined by weighted allocation according to the actual load ratio. Specifically, for example, the first root system distribution ratio can be calculated and determined based on the following expression (1):

[0053] (1)

[0054] In expression (1), This indicates the proportion of the first root system. This represents the optimal root arrangement ratio for achieving the static strength of soil stabilization through root system reinforcement. This represents the optimal root arrangement ratio for improving the dynamic strength of root system soil fixation. This indicates the proportion of static load acting on the target slope determined by the investigation. For example, by collecting data and conducting on-site investigations on the target slope (before reinforcement), the total force of its static and dynamic loads can be estimated, and the proportion can be confirmed based on the ratio between the two.

[0055] After determining the first root system layout ratio in step S120, step S130 can be performed to implement the slope reinforcement project according to the first root system layout ratio. In this step, the slope reinforcement project is implemented by setting up root system guide tubes. For example, root system guide tubes and related reinforcement construction methods in the prior art can be used (such as the related implementation methods involved in the prior patent CN108811874A), which will not be described in detail here.

[0056] In the technical solution of this application, the root system arrangement ratio of the slope greening plants is determined based on the load type to implement the reinforcement project. This targeted slope reinforcement method is conducive to achieving the best slope reinforcement effect.

[0057] To facilitate understanding of the technical solution of this application, the following will introduce and explain the process of pre-determining the root arrangement ratio for the optimal root system static strength and the optimal root system dynamic strength for soil consolidation in the technical solution of this application.

[0058] In one embodiment, the root arrangement ratios that yield the optimal static and dynamic soil-stabilizing strengths in this application are predetermined based on root-stabilizing tests, such as... Figure 2 As shown, the pre-determining process includes:

[0059] Step S210 involves determining the root orientation range of the target plant. It's easy to understand that, as mentioned earlier, the types of common slope protection plants are limited. In practice, the slope protection plants used are usually small trees and shrubs, such as *Amorpha fruticosa*, *Lespedeza bicolor*, *Hippophae rhamnoides*, *Pyracantha fortuneana*, *Magnolia multiflora*, *Pistacia chinensis*, and *Prunus armeniaca*. The target plant here refers to a specific type of slope protection plant, such as *Hippophae rhamnoides*. Specifically, this determination process includes:

[0060] In the study area, root samples of multiple undisturbed plants were obtained by excavation. To ensure that the samples accurately reflect the actual situation, the number of samples must meet certain requirements to effectively support the accuracy and reliability of subsequent analysis. For example, the minimum number of samples should be 10 plants. In practice, the roots of the plants can be dug vertically at a depth of 0.5 to 2.5 m in the soil, collected, and properly placed in plastic bags. The root biomass RB of a single plant within the excavation area in the actual soil can be calculated using the following expression (2).

[0061] (2)

[0062] In expression (2), This indicates the total mass of the excavated root system. This indicates the volume of soil (excavated area).

[0063] Subsequently, a root scanner was used to scan each root sample. Based on the scan data, the root aspect ratio of each sample was calculated. That is, after obtaining the original root biomass, the root scanner was used to scan the roots. Based on the root morphology and structure analysis system, the characteristics of the plant roots were measured and the root parameters such as total root mass (RM), total root length (RL), and total root volume (RV) were obtained. Based on these, the root parameters such as mass density RMD=RM / V, root length density RLD=RL / V, and root volume density RVD=RV / V were calculated. V represents the soil volume containing the roots in each layer.

[0064] The process involves measuring the angles of plant roots and classifying them based on the angles between the roots and the vertical direction. Roots with angles between 0° and 15° are classified as longitudinal roots, those between 75° and 90° as transverse roots, and those between 15° and 75° are further subdivided and assigned to both vertical and horizontal directions. The total number of transverse and longitudinal roots after subdivision is then calculated, and the transverse to longitudinal root ratio is determined for each sample. For each sample, this process can be based on the following expression:

[0065] (3)

[0066] (4)

[0067] (5)

[0068] (6)

[0069] (7)

[0070] In the above expressions (3) to (6), This indicates the number of lateral root systems reduced. This indicates the number of longitudinal roots lost. The angle between the root system and the vertical direction is represented by , and n represents the root coefficient in the sample where the angle is between 15° and 75°. This indicates the total number of lateral roots. This represents the total number of longitudinal roots. Indicates the horizontal root coefficient. denoted by , where P represents the longitudinal root coefficient and P represents the root system's longitudinal-to-transverse ratio.

[0071] In this way, the aspect ratio of each root system sample can be determined, and the minimum and maximum values ​​can be identified. Considering the randomness of sample selection, in order to make the range of root orientation values ​​more accurately reflect objective reality, this application also extends the minimum and maximum root aspect ratio values ​​linearly, and determines the range of root orientation values ​​based on the extended results.

[0072] Specifically, as a particular implementation method, based on the log-normal distribution assumption, this application uses the following expression for linear range extension:

[0073] (8)

[0074] (9)

[0075] In expressions (8) and (9), This indicates the lower limit of the range of root orientation values. This indicates the upper limit of the range of root orientation values. This represents the minimum root system aspect ratio. This represents the maximum root system aspect ratio. This represents the dispersion coefficient, which is generally taken as 0.2 to 0.3.

[0076] Thus, based on the upper and lower limits obtained after the expansion, the range of root orientation values ​​required for subsequent experimental analysis is determined.

[0077] Continue back Figure 2After step S210, continue with step S220, determine the typical value of root distribution based on the root orientation value range, and prepare root-soil composite samples of the corresponding type based on each typical value.

[0078] Specifically, in this step, the typical values ​​of root distribution are determined using the logarithmic space equidistant method based on the range of root orientation values. For example, five typical values ​​are selected, and firstly in [ , Divide the space into five logarithmic values ​​evenly, and then restore it to a linear space. The process can be shown in the following expression:

[0079] (10)

[0080] In expression (10), This represents the i-th typical value.

[0081] After confirming the typical values, root-soil composite specimens of the corresponding type can be prepared based on each typical value. Specifically, this means preparing root-soil composite specimens with root distribution ratios of each typical value that correspond to the experimental requirements.

[0082] For example, the root-soil composite sample is a cylinder with a diameter of 5 cm and a height of 10 cm. Roots of appropriate length and mass are selected as the test sample roots according to the plant root parameters. For example, the root biomass RB in the test sample volume is determined based on the actual root sample, and the root mass to be added to each sample is calculated. For example, based on the selected 5 Pi values ​​(typical values) and the range of variation in the length of the horizontal and vertical roots, a certain length is selected as the test root length. The length of the horizontal and vertical roots to be added to the sample is determined, and the plant roots are artificially arranged horizontally and vertically so that the ratio of the horizontal and vertical root lengths is the corresponding Pi value, so as to obtain the corresponding type of standard sample.

[0083] Next, in step S230, based on the root-soil composite sample prepared in the previous step, a triaxial compression test is performed to determine the shear strength of the sample, and a dynamic triaxial test is performed to determine the dynamic stress amplitude corresponding to the liquefaction state of the sample. The triaxial compression test and the dynamic triaxial test are experimental methods known in the technical field; this application will only briefly describe the experimental process below.

[0084] A. Regarding the triaxial compression experiment

[0085] The experimental setup employed a triaxial compression apparatus to test root-soil composite samples with different root distribution ratios (Pi). The shear rate was 0.5 mm / min. Before loading, the soil samples were vacuum-saturated for 48 hours, and then consolidated for 24 hours. Shear strength was determined under confining pressures of 100 kPa, 200 kPa, and 300 kPa to compare failure modes. The shear strength parameters of the root-soil composite were calculated using Mohr-Coulomb theory. The specific steps were as follows: Mohr circles were drawn, representing the stress state at failure for each confining pressure and maximum normal stress. An envelope was fitted, with all Mohr circles circumscribed by a straight line, which is the shear strength envelope with a slope of tanφ (φ being the internal friction angle) and a ordinate of cohesion c. In Mohr-Coulomb theory, the internal friction angle and cohesion jointly determine the shear strength τ of the soil, expressed by the following formula: φ.

[0086] B. Regarding the dynamic triaxial experiment

[0087] The experimental setup employed the GDS GYNTTTS dynamic triaxial testing system. Slope soil may be subjected to various forms of dynamic loads under natural and human influences, significantly impacting slope stability. In engineering simulations and dynamic response analyses, simplified waveforms are typically used to represent these complex dynamic inputs. For load types such as automobiles, trains, and high-speed rail, simplified waveforms are generally selected based on existing measured data. For example, the dynamic load commonly experienced by slope soil is simplified to a sine wave, and a single-stage cyclic loading method is used for simulation. The purpose of this experiment was to investigate the influence of root distribution on the soil's deformation resistance under long-term loading conditions.

[0088] In actual testing, as mentioned earlier, the standard specimen is a cylinder 10cm high and 5cm in diameter. After the standard-sized specimens are prepared, they are saturated. Here, the vacuum saturation method is used according to the geotechnical testing procedures, and each specimen is saturated in the saturation chamber for 48 hours. During the test, a back pressure saturation program needs to be set on the instrument. When the saturation degree B > 0.95, it is considered fully saturated soil. After saturation, the specimen needs to be consolidated. The main purpose is to ensure that the soil sample reaches a stable state of pore water pressure dissipation after the confining pressure is applied, thereby simulating the stress history or drainage conditions of the soil in actual engineering, ensuring that the reference conditions for subsequent dynamic load application are controllable and repeatable. The external load required for consolidation is determined by the initial stress state and can be controlled by applying different consolidation ratios and degrees of consolidation to the specimens. The degree of consolidation is controlled by the ratio of the compression amount to the final compression amount, or the average degree of consolidation is calculated by the dissipation of excess pore pressure.

[0089] In this experiment, to evaluate the influence of dynamic stress amplitude on the liquefaction characteristics of root-soil composites, dynamic shear strain or dynamic stress amplitude was used as the control index to obtain the dynamic strength of different root-soil composite samples. Dynamic strength is generally defined as the dynamic stress required to reach a specified failure strain or a certain failure criterion under a certain number of cyclic loading cycles N. Different failure criteria are related to soil type. When the soil type is easily liquefied, such as sand, when the pore water pressure rises to the effective confining pressure, i.e., the pore pressure ratio is 1, the soil completely loses its strength and reaches a liquefaction state, which is considered failure. When the soil type is not easily liquefied, such as silt or clay, the dynamic stress corresponding to 5% axial strain is usually used as the dynamic strength criterion. In this application, experiments were conducted based on the above experimental conditions and requirements to obtain the dynamic strength corresponding to different root arrangements.

[0090] After step S230, step S240 is performed. Using statistical methods, the optimal root arrangement ratio for static soil-fixing strength is determined based on the test data of the triaxial compression test in step S230, and the optimal root arrangement ratio for dynamic soil-fixing strength is determined based on the test data of the dynamic triaxial test in step S230.

[0091] Specifically, in this application, the mapping relationship between root distribution ratio and shear strength, and between root distribution ratio and dynamic stress amplitude, are fitted based on experimental data. The extreme points of the curves corresponding to the fitted mapping relationships are then determined, and the root distribution ratio values ​​corresponding to these extreme points are identified as the optimal root distribution ratio for achieving the static strength of soil consolidation. And the optimal root arrangement ratio for root system soil stabilization dynamic strength. .

[0092] This approach, by fitting existing experimental data, can effectively reveal the relationship between root distribution ratio and shear strength and dynamic stress amplitude, even with a limited sample size. This method reduces the need for large amounts of experimental data while ensuring the reliability and accuracy of the results.

[0093] The determination process described in steps S210 to S240 above is for a certain type of slope protection plant. By repeating a similar process for commonly used ecological slope protection plants in practice, the characteristics of the root system of the corresponding ecological slope protection plants can be determined, so as to provide a theoretical basis for root-guided implementation in engineering applications.

[0094] Based on the above embodiments, in some embodiments, the technical solution of this application adopts the method of setting root guide tubes to carry out slope reinforcement engineering.

[0095] like Figure 3As shown, the root guide tubes used are divided into straight guide tubes 31 for guiding the growth of the taproot and diversion guide tubes 32 for guiding the growth of lateral roots. These guide tubes are all made of biodegradable plastic, and multiple (material) exchange holes 33 are evenly distributed on the tube wall. Preferably, the distribution of the exchange holes has a certain density gradient, resulting in a higher density of exchange holes at the end of the assembled tube, meaning there are more exchange holes further away from the top of the tube, thus encouraging the roots to grow towards areas with more water and nutrients.

[0096] Similar to existing technologies, the straight guide tube has different lengths to accommodate different depths of the landslide body. The straight guide tube is filled with a layer of natural soil. Multiple crackable strips 31a are evenly distributed along the circumference of the lower part of the straight guide tube 31, and protruding threaded holes (not shown in the figure) are distributed along the circumference of the upper part for connecting to the diversion guide tube 32. The diversion guide tube 32 is shorter and has threaded structures (not shown in the figure) at both ends to facilitate connection with the straight guide tube or interconnection between the diversion guide tubes. The diversion guide tubes can be interconnected to increase their length, controlling the length and angle of lateral root growth. In practical implementation, as a preferred method, lateral root growth can also be guided by placing a substrate containing growth hormone into the end diversion guide tube. For example, a hormone slow-release chamber 32a can be set in the very end diversion guide tube, filled with a substrate containing growth hormone to induce root growth.

[0097] In this embodiment, the specific steps in the engineering implementation process are as follows:

[0098] Step 1: Evaluate the depth of the landslide body using slope calculation software (such as Geo-Studio, Plaxis), and design a straight guide tube of appropriate length; select an appropriate number of diversion guide tubes for assembly based on the determined first root system layout ratio applicable to the target slope.

[0099] Step 2: The bottom of the straight guide tube is sheared to form multiple slits that are evenly opened along the circumference;

[0100] Step 3: Fill the inside of the straight guide tube with soil, water-retaining agent and slow-release fertilizer to form a natural soil layer;

[0101] Step 4: Add a matrix containing growth hormone to the hormone sustained-release chamber of the end diversion guide tube;

[0102] Step 5: Connect the straight guide cylinder and the diversion guide cylinder using the threaded protrusion on the upper part of the straight guide cylinder, so that the straight guide cylinder and the diversion guide cylinder form a whole;

[0103] Step 6: Plant ecological slope protection plants that are easy to grow in the protected area inside the straight guide tube;

[0104] Step 7: On the surrounding rock below the sliding surface of the landslide body, the integral guide tube is first excavated and then buried. After the tube is buried, backfilling is carried out to complete the slope protection construction.

[0105] The shortcomings of the above solutions are the result of the inventor's practical experience and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this application below should be considered as the inventor's contributions to this application.

[0106] This application provides a slope reinforcement method based on artificially guided root distribution, the main technical effects of which are reflected in the following aspects:

[0107] By accurately analyzing and determining the dominant load types (including static loads, dynamic loads, and combined loads) of the target slope, and selecting or calculating the optimal root system layout ratio based on these load types, the stability and disaster resistance of the slope under different working conditions can be significantly improved. Specific root system soil stabilization tests are used to calculate the optimal root system layout ratio, including triaxial compression tests and dynamic triaxial tests, to determine the shear strength and dynamic stress amplitude of each type of specimen, ensuring the reliability and effectiveness of the root system layout scheme and improving the success rate of project implementation. Multiple different dominant load types are considered, and specific root system layout strategies are provided for each type. Whether facing static loads, dynamic loads, or even combined loads under complex conditions, the most suitable solution can be found. The implementation of slope reinforcement projects using root guide tubes, with a substrate containing growth hormones placed inside the guide tubes to guide the growth of lateral roots, helps to more effectively control the growth direction of the roots, promotes healthy root development, and thus significantly improves the slope reinforcement effect.

[0108] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A slope reinforcement method based on artificially guided root distribution, characterized in that, include: Investigate the target slope to determine the dominant load type of the slope; Based on the dominant load type, and according to the predetermined root arrangement ratios for the optimal static strength and dynamic strength of root soil consolidation, respectively, a first root arrangement ratio applicable to the target slope is determined. The slope reinforcement project will be implemented according to the first root system distribution ratio; The root distribution ratio refers to the ratio of horizontal roots to vertical roots in a plant root system. The optimal root arrangement ratios for both static and dynamic soil-stabilizing strength are determined in advance based on root-stabilizing tests; the process of this determination includes: Determine the range of root orientation distribution values ​​for the target plant; determine typical values ​​of root distribution based on the range of root orientation distribution values; and prepare root-soil composite samples of corresponding types based on each typical value. Based on the root-soil composite sample, a triaxial compression test was conducted to determine the shear strength of the sample, and a dynamic triaxial test was conducted to determine the dynamic stress amplitude corresponding to the liquefaction state of the sample. Using statistical methods, the optimal root arrangement ratio for static soil stabilization was determined based on the experimental data from triaxial compression tests, and the optimal root arrangement ratio for dynamic soil stabilization was determined based on the experimental data from dynamic triaxial tests.

2. The slope reinforcement method based on artificially guided root distribution according to claim 1, wherein, The dominant load types include static load types and dynamic load types; When the target slope is a static load type, the root arrangement ratio that is optimal for the static strength of root system soil stabilization will be determined as the first root arrangement ratio. When the target slope is subject to dynamic load, the root arrangement ratio that is optimal for the dynamic strength of root system soil stabilization is determined as the first root arrangement ratio.

3. The slope reinforcement method based on artificially guided root distribution according to claim 2, wherein, The dominant load type also includes composite load type; when the target slope belongs to composite load type, the first root system distribution ratio is calculated and determined based on the following expression: in, This indicates the proportion of the first root system. This represents the optimal root arrangement ratio for achieving the static strength of soil stabilization through root system reinforcement. This represents the optimal root arrangement ratio for improving the dynamic strength of root system soil fixation. This indicates the proportion of static load acting on the target slope determined by the survey.

4. The slope reinforcement method based on artificially guided root distribution according to claim 1, wherein, The process of determining the range of root orientation values ​​for the target plant includes: Root samples from multiple undisturbed plants were obtained in the study area using an excavation method. The root system samples are scanned using a root scanner. The root aspect ratio of each sample is calculated based on the scan data. The minimum and maximum root aspect ratios are then linearly expanded to determine the range of root orientation values.

5. The slope reinforcement method based on artificially guided root distribution according to claim 4, wherein, Linear range extension is performed based on the following expression: in, This indicates the lower limit of the range of root orientation values. This indicates the upper limit of the range of root orientation values. This represents the minimum root system aspect ratio. This represents the maximum root system aspect ratio. This represents the coefficient of dispersion.

6. The slope reinforcement method based on artificially guided root distribution according to claim 5, wherein, Based on the range of root orientation values, the typical values ​​of root distribution are determined using the logarithmic spatial equal interval method.

7. The slope reinforcement method based on artificially guided root distribution according to claim 1, wherein, The statistical method employed is as follows: Based on the experimental data, the mapping relationship between root distribution ratio and shear strength, and the mapping relationship between root distribution ratio and dynamic stress amplitude were fitted. The extreme points of the curves corresponding to the fitted mapping relationships were determined. The root distribution ratio values ​​corresponding to the extreme points were determined as the optimal root distribution ratio for static soil stabilization and the optimal root distribution ratio for dynamic soil stabilization.

8. The slope reinforcement method based on artificially guided root distribution according to any one of claims 1 to 7, wherein, The slope reinforcement project was carried out by installing root guide tubes.

9. The slope reinforcement method based on artificially guided root distribution according to claim 8, wherein, The types of root guide tubes include straight guide tubes and diversion guide tubes, which guide the growth of lateral roots by placing a substrate containing growth hormone into the diversion guide tube at the end.

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