Expansion engineering characteristic testing system and method of expansive soil, electronic equipment and medium

Abstract

The invention provides an expansion engineering characteristic testing system and method of expansive soil, electronic equipment and a medium. The system comprises a sleeve device, a datum point device and a water injection device, installing a sleeve device with a size corresponding to the type of the expansive soil at each basic test point on the slope surface of the side slope where the expansive soil is located; a datum point device is vertically installed at the datum point; the expansion engineering characteristic difference value between the adjacent basic test points is smaller than or equal to a preset expansion engineering characteristic difference value threshold value; when the basic test point is tested, the water injection device is connected with the installed sleeve device so as to inject water into the expansive soil; and determining the expansion engineering characteristics according to the height difference before water injection and the height difference after water injection between the top center of the basic test point and the top center of the corresponding reference point. The expansion engineering characteristic test can be carried out in situ on the expansive soil, the original structure and the real stress state of the soil body are kept, the test result is accurate and reliable, and the spatial variability of the soil body is reflected.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering investigation technology, and more specifically, to a testing system, method, electronic device, and medium for testing the expansion engineering characteristics of expansive soil. Background Technology

[0002] Expansive soil (rock) is a cohesive soil or soft rock rich in hydrophilic minerals such as montmorillonite and illite. It has the characteristic of swelling when exposed to water and shrinking and cracking when dehydrated, and is a major cause of engineering problems such as slope instability, roadbed deformation, and building cracking. Current engineering identification mainly relies on indoor free expansion rate tests, which measure the volume expansion rate and classify the expansion level after sampling, drying, crushing, and sieving.

[0003] However, this method has obvious drawbacks: first, it destroys the original structure and cementation state of the soil; second, it cannot restore the in-situ stress and constraint conditions, resulting in distorted results; third, the sampling is not representative enough and it is difficult to reflect the spatial variability of the soil; and fourth, the design is too conservative or the judgment is inaccurate, affecting the safety and economy of the project. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a testing system, method, electronic equipment and medium for the expansive engineering properties of expansive soil, which can perform expansive engineering property testing in situ on expansive soil, maintain the original structure and true stress state of the soil, and provide accurate and reliable test results that can reflect the spatial variability of the soil, provide precise parameters for engineering design, and improve safety and economy.

[0005] In a first aspect, embodiments of this application provide a testing system for the expansive engineering characteristics of expansive soil, the system comprising: a casing device, a reference point device, a water injection device, and a testing module; At each basic test point on the slope surface where the expansive soil is located, a sleeve device of a size corresponding to the type of expansive soil is installed; at each reference point corresponding to each basic test point, a reference point device is vertically installed; the expansive engineering characteristics between adjacent basic test points... The performance difference is less than or equal to the preset expansion engineering performance difference threshold; all reference points corresponding to each basic test point are centered on the corresponding basic test point; When testing the expansion engineering characteristics of any basic test point, the water injection device is connected to the sleeve device installed at the basic test point to inject water into the expansive soil at the basic test point. The test module is used to determine the vertical expansion deformation of the basic test point based on the height difference before and after water injection between the top center of the expansive soil at the basic test point and the top center of the expansive soil at the corresponding benchmark points. The testing module is also used to determine the vertical expansion deformation of all basic test points as the expansion engineering characteristics of the expansive soil.

[0006] In this embodiment of the application, the system further includes: a heating rod; Before testing the expansion engineering characteristics of the basic test point, multiple heating rods are inserted into the expansion soil at the basic test point to heat the expansion soil and reduce its moisture content to the shrinkage limit moisture content. The shrinkage limit moisture content refers to the boundary moisture content at which the volume of the expansion soil no longer shrinks when the moisture content continues to decrease after further heating.

[0007] In this embodiment of the application, the reference point device is composed of multiple stainless steel pipe sections joined together; each stainless steel pipe section has fine thread at both ends, and the fine thread of adjacent stainless steel pipe sections is joined together by screwing.

[0008] In this embodiment of the application, the system further includes a guide sleeve and a hammer; At the reference point, the reference point device is vertically driven into the target soil layer at the reference point using the guide sleeve and the hammer; the target soil layer refers to the soil layer whose deformation degree is less than a preset deformation degree threshold during the expansion engineering characteristic test.

[0009] In this embodiment of the application, the water injection device includes a water supply device and a porous water injection needle tube; the water supply device is connected to the porous water injection needle tube; the porous water injection needle tube is inserted into the water injection port on the sleeve device installed at the basic test point. Water supply equipment for injecting water into the porous water injection needle tube; The porous injection needle is used to inject water into the expansive soil at the basic test point through the sleeve device.

[0010] In this embodiment of the application, the system further includes an electronic level. The electronic level is used to measure the height difference between the top center of the expansive soil at the basic test point and the top center of the expansive soil at the corresponding benchmark points before water injection, before heating the expansive soil. The electronic level is also used to measure the height difference between the top center of the expansive soil at the basic test point and the top center of the expansive soil at the corresponding benchmark points after water injection.

[0011] In this embodiment of the application, the testing module is specifically used for: For each benchmark point, calculate the difference between the height difference before water injection and the height difference after water injection between the top center of the expansive soil at the basic test point and the top center of the expansive soil at the corresponding benchmark point, and obtain the vertical expansion deformation of the basic test point under the benchmark point. The vertical expansion deformation of the basic test points is determined based on the vertical expansion deformation of all basic test points under all reference points.

[0012] Secondly, embodiments of this application also provide a method for testing the expansive engineering characteristics of expansive soil, wherein the method is applied to the test module of the expansive engineering characteristics testing system for expansive soil as described in the first aspect; Obtain the height difference before and after water injection between the top center of the expansive soil at the basic test point and the top center of the expansive soil at each corresponding benchmark point. The vertical expansion deformation of the basic test point is determined based on the height difference before and after water injection between the top center of the expansive soil at the basic test point and the top center of the expansive soil at the corresponding benchmark points. The vertical expansion deformation at all basic test points is determined as the expansion engineering characteristic of the expansive soil.

[0013] Thirdly, embodiments of this application also provide an electronic device, including: a processor, a storage medium, and a bus, wherein the storage medium stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor communicates with the storage medium via the bus, and the processor executes the machine-readable instructions to perform the steps of the method for testing the expansive engineering characteristics of expansive soil as described in the second aspect.

[0014] Fourthly, embodiments of this application also provide a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the steps of the method for testing the expansive engineering properties of expansive soil as described in the second aspect.

[0015] This application provides a system, method, electronic device, and medium for testing the expansion engineering properties of expansive soil. The system includes: a casing device, a reference point device, a water injection device, and a testing module. At each basic test point on the slope surface where the expansive soil is located, a casing device of a size corresponding to the type of expansive soil is installed. At each reference point corresponding to each basic test point, a reference point device is vertically installed. The difference in expansion engineering properties between adjacent basic test points is less than or equal to a preset threshold value. When testing the expansion engineering properties of any basic test point, the water injection device is connected to the casing device installed at the basic test point to inject water into the expansive soil at the basic test point. The testing module is used to determine the expansion engineering properties of the expansive soil based on the height difference before and after water injection between the top center of the expansive soil at the basic test point and the top center of the expansive soil at the corresponding reference points. This application enables in-situ testing of the expansion engineering properties of expansive soil, maintaining the original soil structure and true stress state. The test results are accurate and reliable, reflecting the spatial variability of the soil, providing precise parameters for engineering design, and improving safety and economy. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This invention provides a schematic diagram of the structure of a testing system for the expansion engineering properties of expansive soil according to an embodiment of this application. Figure 2 A schematic diagram of the reference point device provided in an embodiment of this application is shown; Figure 3 A schematic diagram of the sleeve device provided in an embodiment of this application is shown; Figure 4 A schematic diagram of the water injection device provided in an embodiment of this application is shown; Figure 5 This paper shows a schematic diagram of the structure of the moisture content testing module provided in an embodiment of this application; Figure 6 A flowchart illustrating the method for testing the expansion engineering properties of expansive soil according to an embodiment of this application is shown. Figure 7 A schematic diagram of the structure of an electronic device provided in an embodiment of this application is shown. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the accompanying drawings in this application are for illustrative and descriptive purposes only and are not intended to limit the scope of protection of this application. Furthermore, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of this application. It should be understood that the operations in the flowcharts may not be implemented in sequence, and steps without logical contextual relationships may be reversed or implemented simultaneously. In addition, those skilled in the art, guided by the content of this application, may add one or more other operations to the flowcharts, or remove one or more operations from the flowcharts.

[0019] Furthermore, the described embodiments are merely some, not all, of the embodiments of this application. The components of the embodiments of this application described and illustrated herein can typically be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0020] To enable those skilled in the art to utilize the content of this application, and in conjunction with the specific application scenario of "geotechnical engineering investigation technology," the following embodiments are provided. For those skilled in the art, the general principles defined herein can be applied to other embodiments and application scenarios without departing from the spirit and scope of this application. Although this application primarily describes the field of "geotechnical engineering investigation technology," it should be understood that this is merely an exemplary embodiment.

[0021] It should be noted that the term "comprising" will be used in the embodiments of this application to indicate the presence of the features declared thereafter, but does not exclude the addition of other features.

[0022] Expansive soil (rock) is a type of cohesive soil or soft rock rich in hydrophilic minerals (such as montmorillonite and illite). It expands in volume when its water content increases and shrinks and cracks when it loses water. This expansion and contraction characteristic is the main cause of engineering problems such as slope instability, roadbed deformation, and building cracking in its region.

[0023] Currently, in engineering practice, the determination of the expansibility of expansive soil (rock) mainly relies on the indoor free expansion rate test. The standardized procedure of this method is as follows: after obtaining the undisturbed soil sample from the site, it is dried, crushed, and sieved. A certain amount of loose soil powder is put into a graduated cylinder, and its volume expansion rate in the free accumulation state in water is measured, and the expansion grade is classified accordingly.

[0024] However, this method has a fundamental flaw: (1) Structural damage: The drying and crushing process completely destroys the original structure, cementation and natural fissures of the soil, while the structure of the in-situ soil has a significant restrictive or enhancing effect on its expansion potential and expansion pressure.

[0025] (2) Distortion of stress state: The indoor test cannot simulate the overburden pressure and lateral constraints on the in-situ soil, resulting in the test results (free expansion rate) being much greater than the expansion amount that the soil can exhibit under the constraint state in actual engineering.

[0026] (3) Insufficient representativeness: Expansive soil (rock) in slopes is often distributed heterogeneously (e.g., uniformly distributed, scattered, strip-shaped), and the small number of point samples in the laboratory test are difficult to reflect its spatial variability.

[0027] (4) Limited guidance significance: Designs based on free expansion rate are often too conservative, resulting in high engineering costs or engineering accidents due to inaccurate judgment.

[0028] In view of this, this application provides a testing system for the expansion engineering properties of expansive soil. The system includes: a casing device, a reference point device, a water injection device, and a testing module. At each basic test point on the slope surface where the expansive soil is located, a casing device of a size corresponding to the type of expansive soil is installed. At each reference point corresponding to each basic test point, a reference point device is vertically installed. The difference in expansion engineering properties between adjacent basic test points is less than or equal to a preset threshold value. When testing the expansion engineering properties of any basic test point, the water injection device is connected to the casing device installed at the basic test point to inject water into the expansive soil at the basic test point. The testing module is used to determine the expansion engineering properties of the expansive soil based on the height difference before and after water injection between the top center of the expansive soil at the basic test point and the top center of the expansive soil at the corresponding reference points. This application enables in-situ testing of the expansion engineering properties of expansive soil, maintaining the original soil structure and true stress state. The test results are accurate and reliable, reflecting the spatial variability of the soil, providing precise parameters for engineering design, and improving safety and economy.

[0029] Reference Figure 1 The diagram shown is a structural schematic of a testing system for the expansion engineering properties of expansive soil provided in an embodiment of this application; refer to... Figure 2 The diagram shown is a structural schematic of the reference point device provided in an embodiment of this application; refer to Figure 3 The diagram shown is a structural schematic of the sleeve device provided in an embodiment of this application; refer to... Figure 4 The diagram shown is a structural schematic of the water injection device provided in an embodiment of this application; refer to... Figure 5 The diagram shown is a structural schematic of the limiting moisture content testing module provided in an embodiment of this application. The system includes: a casing device 1, a reference point device 2, a water injection device, and a testing module.

[0030] Before testing, a preliminary regional survey is required: geological exploration of the engineering area, collection of undisturbed soil samples for indoor free expansion rate tests, and preliminary determination of the distribution and grade of expansive soil (rock) to locate the slopes corresponding to each expansion grade. Then, on the slopes corresponding to each expansion grade within the engineering area, expansion engineering characteristic tests are conducted on the expansive soil corresponding to each expansion grade. The expansion grade is a strength level classified according to the expansion and contraction deformation indicators of expansive soil (such as free expansion rate, expansion rate, expansion force, etc.), used to evaluate its potential hazard to the engineering structure.

[0031] At each basic test point on the slope surface where the expansive soil is located (as shown in test point A, test point B, and test point C in the figure), install a sleeve device of the corresponding size to the type of expansive soil.

[0032] In this embodiment of the application, in order to prevent expansive soil from being squeezed and expanded outwards when it comes into contact with water, thereby affecting the accuracy of the expansive engineering characteristic test, a sleeve device is installed to constrain the in-situ soil sample of the expansive soil at the basic test point (i.e., to enclose and fix the in-situ soil and keep the original structure intact); moreover, the sleeve is equivalent to a rigid cylinder, which binds the soil in the horizontal direction and only allows the soil to expand or be stressed vertically, so as to provide lateral confinement for the expansive soil at the basic test point.

[0033] Specifically, different sizes of casing devices are used for different types of expansive soil. The expansive soil type is determined by the geological structure of the slope and the distribution characteristics of the expansive soil (rock), or by the degree of fissures in the expansive soil after water exposure. This can include homogeneous expansive soil / rock types and fissured / fragmented expansive soil / rock types. After excavating to the expansive soil (rock) distribution layer at the test point, the casing is vertically pressed into the soil to ensure in-situ constraint of the soil sample.

[0034] Among them, the casing device 1 is a rectangular tube with a square cross-section, available in two sizes: 15cm and 20cm, and both are 50cm long. For homogeneous expansive soil / rock types (i.e., with obvious fissures), the 15cm size is selected; for fissured / fractured expansive soil / rock types (with multiple sets of joints), the 20cm size is selected.

[0035] Among them, homogeneous expansive soil / rock is a type of expansive soil or soft rock with uniform composition, intact structure, and no obvious cracks. It expands uniformly as a whole when exposed to water, rather than expanding in a localized, fragmented, or cracked manner. Fissured / fragmented expansive soil / rock: This type of expansive soil / rock is highly fragmented due to multi-directional cracks, resulting in an incomplete and fragmented structure. Water can easily seep in quickly along the cracks, leading to uneven expansion, strong abrupt changes, and a tendency to disintegrate and collapse.

[0036] In addition, the difference in expansion engineering properties between adjacent basic test points selected on the slope surface where the expansive soil is located must be less than or equal to a preset threshold for the difference in expansion engineering properties. The testing module can select basic test points through the following process: First, select at least three basic test points at the upper, middle, and lower parts of the slope surface (i.e., at least one basic test point needs to be selected at each part); then, test the expansion engineering properties of the expansive soil at each basic test point; if the difference in expansion engineering properties between adjacent basic test points is greater than the preset threshold for the difference in expansion engineering properties (e.g., the difference in vertical expansion deformation exceeds 20%), then insert at least one new basic test point between adjacent basic test points that are greater than the preset threshold for the difference in expansion engineering properties, until the difference in expansion engineering properties between all adjacent basic test points is less than or equal to the preset threshold for the difference in expansion engineering properties, thus completing the selection of basic test points.

[0037] Here, the basic test point selection method provided in this application embodiment is similar to "grid search" until the distribution characteristics of the expansion properties of the entire slope are understood. This method ensures that the test results can reflect the whole while capturing local anomalies, achieving a balance between "economy" and "completeness" and ensuring the capture of spatial variability.

[0038] At each reference point corresponding to each basic test point, a reference point device is installed vertically; all reference points corresponding to each basic test point are centered on the corresponding basic test point.

[0039] In the embodiments of this application, for each basic test point, at least two reference points are arranged symmetrically or in a triangle with the sleeve device 1 installed at the basic test point as the center, and the spacing is generally 1-2 meters.

[0040] Each reference point device 2 has a tube body section 10 composed of multiple overlapping stainless steel tube sections, each 30cm long. The tube body is laser-etched with graduations accurate to 1mm. Each stainless steel tube section has fine threads at both ends, which are matched to each other. Adjacent stainless steel tube sections are screwed together to achieve a quick and stable connection. The bottom section 9 of the reference point device is machined into a tapered shape to facilitate driving in. The top of the reference point tube can be fitted with a protective cap 11 with a level bubble to assist in vertical adjustment during installation.

[0041] In addition, the system also includes a guide sleeve and a hammer; at the benchmark point, the benchmark point device 2 is driven vertically into the target soil layer at the benchmark point through the guide sleeve and the hammer. When driving the pile, check whether the air bubble is centered to ensure that the pipe is driven vertically without being crooked or tilted; the target soil layer refers to the soil layer whose deformation degree is less than the preset deformation degree threshold during the expansion engineering characteristic test.

[0042] Furthermore, the system also includes an electronic level 12; the electronic level 12 is used to measure the height difference between the top center of the expansive soil at each basic test point and the top center of the expansive soil at the corresponding reference point before water injection, before heating the expansive soil.

[0043] Furthermore, the system also includes: heating rods 7; before testing the expansion engineering characteristics of the basic test points, multiple heating rods are inserted into the expansive soil at the basic test points to heat the expansive soil and reduce its moisture content to the shrinkage limit moisture content; the shrinkage limit moisture content refers to the boundary moisture content at which the volume no longer shrinks when the expansive soil continues to be heated and the moisture content continues to decrease.

[0044] In this embodiment of the application, low-power heating rods (power controlled at 100-200W) are evenly inserted into the expansive soil at each basic test point to heat the expansive soil at a low temperature (40-60°C) so that the moisture content of the expansive soil decreases to the shrinkage limit moisture content (simulating a dry state).

[0045] The shrinkage limit moisture content is pre-determined, and the specific determination process is as follows: The system also includes a small microwave oven 6; using the small microwave oven 6, based on the principle of gravimetric analysis, the soil sample is placed in the sample box 15, and then the optimal heating power (e.g., 500-800W) and duration (e.g., 10-20 minutes) for the expansive soil being tested are determined through preliminary indoor tests and standard oven calibration. Then, the shrinkage limit moisture content is quickly and accurately quantified on-site using the shrinkage dish method or the combined liquid and plastic limit determination method.

[0046] The microwave oven can be powered by a built-in battery or an external power bank, making it suitable for outdoor environments. During testing, a small soil sample (approximately 50g) is placed on the microwave oven heating plate, dried, and then the shrinkage limit moisture content is calculated.

[0047] When testing the expansion engineering characteristics of any basic test point, the water injection device is connected to the casing device installed at the basic test point to inject water into the expansive soil at the basic test point.

[0048] In this embodiment, the water injection device includes a water supply device and a porous water injection needle 4; the water supply device is connected to the porous water injection needle 4; the porous water injection needle is inserted into the water injection port on the sleeve device installed at the basic test point; the water supply device is used to inject water into the porous water injection needle 4; the porous water injection needle 4 is used to inject water into the expansive soil at the basic test point through the sleeve device 1 until the difference between the vertical expansion deformation of the expansive soil observed twice consecutively within a preset time period is less than a preset deformation threshold.

[0049] For example, in the initial stage of immersion, the soil expands and deforms rapidly, and the observation interval should be 10-30 minutes. After the expansion and deformation slows down, observations should be made every hour until the expansion and deformation stabilize. The stabilization standard for expansion and deformation is: the difference in vertical expansion and deformation between two consecutive observation periods should not exceed ±0.5 mm.

[0050] The water supply equipment includes a water tank 3, a water pump 5, and a multi-port connector 13; the water pump 5 is connected to the water tank 3, and the water tank 3 is connected to the multi-port connector 13 through a water supply hose 14; the multi-port connector 13 is connected to a multi-hole water injection needle tube 4.

[0051] Here, the casing device 1 is integrally cast from aluminum alloy. Multiple rows of water injection holes (approximately 2-3 mm in diameter, spaced 5-10 cm apart) are evenly distributed on the sidewall of the casing device 1. A multi-hole water injection needle 4 is inserted into the water injection port on the casing device installed at the basic test point. The multi-hole water injection needle 4 is inserted into the expansive soil through the water injection holes on the sidewall of the casing device 1, enabling simultaneous lateral and internal water injection into the expansive soil to simulate extreme rainfall or seepage conditions.

[0052] The water injection rate should be controlled evenly to avoid eroding the soil sample until the soil sample is saturated (this can be controlled by observing surface seepage or by time).

[0053] After water is injected into the expansive soil at the basic test point, the electronic level is also used to measure the height difference between the top center of the expansive soil at the basic test point and the top center of the expansive soil at the corresponding benchmark points after water injection.

[0054] The testing module is used to determine the vertical expansion deformation of the basic test point based on the height difference before and after water injection between the top center of the expansive soil at the basic test point and the top center of the expansive soil at the corresponding benchmark points. The testing module is also used to determine the vertical expansion deformation of all basic test points as the expansive engineering characteristics of the expansive soil.

[0055] In this embodiment of the application, for each reference point, the difference between the height difference before water injection and the height difference after water injection between the top center of the expansive soil at the basic test point and the top center of the expansive soil at the corresponding reference point is calculated to obtain the vertical expansion deformation of the basic test point under the reference point; based on the vertical expansion deformation of all basic test points under all reference points, the vertical expansion deformation of the basic test point is determined.

[0056] Here, the average or weighted sum of the vertical expansion deformation of all basic test points under all reference points can be determined as the vertical expansion deformation of the basic test points.

[0057] Optionally, the testing module is further configured to, for each basic test point, obtain the first elevation difference between corresponding benchmark points before testing the basic test point; obtain the second elevation difference between corresponding benchmark points after testing the basic test point; calculate the absolute value of the difference between the first elevation difference and the second elevation difference for every two benchmark points; calculate the average value of the absolute values ​​of all differences for each benchmark point; if the average value is less than a preset elevation difference threshold (e.g., 1 mm), then the benchmark point is determined as a target benchmark point; determine the vertical expansion deformation of the basic test point based on the elevation difference before and after water injection between the top center of the expansive soil at the basic test point and the top center of the expansive soil at each corresponding target benchmark point; the testing module is further configured to determine the vertical expansion deformation of all target basic test points as the expansive engineering characteristics of the expansive soil.

[0058] Here, the process of verifying the benchmark point provided in the embodiments of this application can ensure the accuracy of system testing.

[0059] Based on the same inventive concept, this application also provides a method for testing the expansion engineering characteristics of expansive soil corresponding to the expansive engineering characteristics testing system for expansive soil. Since the principle of the device in this application is similar to that of the expansive engineering characteristics testing system for expansive soil described above in this application, the implementation of the method can refer to the implementation of the system, and the repeated parts will not be described again.

[0060] Reference Figure 6 The diagram shown is a flowchart illustrating the method for testing the expansion engineering properties of expansive soil according to an embodiment of this application; the method is applied to the testing module in the above-mentioned expansive soil expansion engineering property testing system. S601. Obtain the height difference before and after water injection between the top center of the expansive soil at the basic test point and the top center of the expansive soil at each corresponding benchmark point. S602. Determine the vertical expansion deformation of the basic test point based on the height difference before and after water injection between the top center of the expansive soil at the basic test point and the top center of the expansive soil at the corresponding benchmark points. S603. Determine the vertical expansion deformation of all basic test points as the expansion engineering characteristics of the expansive soil.

[0061] like Figure 7 As shown in the embodiment of this application, an electronic device 700 includes a processor 701, a memory 702, and a bus. The memory 702 stores machine-readable instructions that can be executed by the processor 701. When the electronic device is running, the processor 701 communicates with the memory 702 via the bus. The processor 701 executes the machine-readable instructions to perform the steps of the above-described method for testing the expansion engineering characteristics of expansive soil.

[0062] Specifically, the memory 702 and processor 701 mentioned above can be general-purpose memory and processor, without any specific limitations. When the processor 701 runs the computer program stored in the memory 702, it can execute the above-mentioned method for testing the expansion engineering characteristics of expansive soil.

[0063] Corresponding to the above-mentioned method for testing the expansive engineering characteristics of expansive soil, this application embodiment also provides a computer-readable storage medium, on which a computer program is stored, and the computer program is executed by a processor to perform the steps of the above-mentioned method for testing the expansive engineering characteristics of expansive soil.

[0064] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems and devices described above can be referred to the corresponding processes in the method embodiments, and will not be repeated here. In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection can be through some communication interfaces; the indirect coupling or communication connection of devices or modules can be electrical, mechanical, or other forms.

[0065] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0066] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0067] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0068] The above are merely specific embodiments 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 testing system for the expansion engineering properties of expansive soil, characterized in that, The system includes: a casing device, a reference point device, a water injection device, and a testing module; At each basic test point on the slope surface where the expansive soil is located, a sleeve device of the corresponding size to the type of expansive soil is installed; at each benchmark point corresponding to each basic test point, a benchmark device is installed vertically; the difference in expansive engineering characteristics between adjacent basic test points is less than or equal to a preset threshold for the difference in expansive engineering characteristics; all benchmark points corresponding to each basic test point are centered on the corresponding basic test point. When testing the expansion engineering characteristics of any basic test point, the water injection device is connected to the sleeve device installed at the basic test point to inject water into the expansive soil at the basic test point. The test module is used to determine the vertical expansion deformation of the basic test point based on the height difference before and after water injection between the top center of the expansive soil at the basic test point and the top center of the expansive soil at the corresponding benchmark points. The testing module is also used to determine the vertical expansion deformation of all basic test points as the expansion engineering characteristics of the expansive soil.

2. The testing system for the expansion engineering characteristics of expansive soil according to claim 1, characterized in that, The system also includes: a heating rod; Before testing the expansion engineering characteristics of the basic test point, multiple heating rods are inserted into the expansion soil at the basic test point to heat the expansion soil and reduce its moisture content to the shrinkage limit moisture content. The shrinkage limit moisture content refers to the boundary moisture content at which the volume of the expansion soil no longer shrinks when the moisture content continues to decrease after further heating.

3. The testing system for the expansion engineering characteristics of expansive soil according to claim 1, characterized in that, The reference point device is composed of multiple stainless steel pipe sections joined together; each stainless steel pipe section has fine threads at both ends, and the fine threads of adjacent stainless steel pipe sections are joined together by screwing.

4. The testing system for the expansion engineering characteristics of expansive soil according to claim 3, characterized in that, The system also includes a guide sleeve and a hammer; At the reference point, the reference point device is driven vertically into the target soil layer at the reference point using the guide sleeve and the hammer. The target soil layer refers to the soil layer whose deformation degree is less than the preset deformation degree threshold during the expansion engineering characteristic test.

5. The testing system for the expansion engineering characteristics of expansive soil according to claim 1, characterized in that, The water injection device includes a water supply device and a multi-hole water injection needle tube; the water supply device is connected to the multi-hole water injection needle tube; the multi-hole water injection needle tube is inserted into the water injection port on the sleeve device installed at the basic test point. Water supply equipment for injecting water into the porous water injection needle tube; The porous injection needle is used to inject water into the expansive soil at the basic test point through the sleeve device.

6. The testing system for the expansion engineering characteristics of expansive soil according to claim 2, characterized in that, The system also includes an electronic level. The electronic level is used to measure the height difference between the top center of the expansive soil at the basic test point and the top center of the expansive soil at the corresponding benchmark points before water injection, before heating the expansive soil. The electronic level is also used to measure the height difference between the top center of the expansive soil at the basic test point and the top center of the expansive soil at the corresponding benchmark points after water injection.

7. The testing system for the expansion engineering characteristics of expansive soil according to claim 6, characterized in that, The test module is specifically used for: For each benchmark point, calculate the difference between the height difference before water injection and the height difference after water injection between the top center of the expansive soil at the basic test point and the top center of the expansive soil at the corresponding benchmark point, and obtain the vertical expansion deformation of the basic test point under the benchmark point. The vertical expansion deformation of the basic test points is determined based on the vertical expansion deformation of all basic test points under all reference points.

8. A method for testing the expansion engineering properties of expansive soil, characterized in that, The method is applied to the test module of the expansive engineering characteristics test system for expansive soil as described in claim 1; Obtain the height difference before and after water injection between the top center of the expansive soil at the basic test point and the top center of the expansive soil at each corresponding benchmark point. The vertical expansion deformation of the basic test point is determined based on the height difference before and after water injection between the top center of the expansive soil at the basic test point and the top center of the expansive soil at the corresponding benchmark points. The vertical expansion deformation at all basic test points is determined as the expansion engineering characteristic of the expansive soil.

9. An electronic device, characterized in that, include: The device includes a processor, a storage medium, and a bus. The storage medium stores machine-readable instructions executable by the processor. When the electronic device is running, the processor communicates with the storage medium via the bus, and the processor executes the machine-readable instructions to perform the steps of the method for testing the expansive engineering properties of expansive soil as described in claim 8.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, which, when executed by a processor, performs the steps of the method for testing the expansive engineering characteristics of expansive soil as described in claim 8.

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