A test method for distinguishing deep-sea soil conditions

Abstract

The present application relates to the technical field of marine soil test, in particular to a test method for distinguishing deep-sea soil state, which comprises the following steps: remodeling deep-sea soil, uniformly mixing equal amount of remodeled soil with water of different mass to obtain different initial high water content soil samples, obtaining the turbidity volume of the remodeled soil in the different initial high water content soil samples at each time during free settlement and after settlement stabilization, determining the water content of the turbidity, and determining the water content for distinguishing soil state based on the change relation of the water content of the turbidity; performing shear rate strength test on the different initial high water content soil samples to obtain the change relation of soil yield stress with water content; comparing and verifying the water content for distinguishing soil state with the change relation of soil yield stress with water content to determine the final water content for distinguishing soil state. The present application can effectively improve the measurement accuracy of the water content for distinguishing soil state of deep-sea soil.

Description

Technical Field

[0001] This invention relates to the field of marine soil testing technology, and specifically to a test method for distinguishing the state of deep-sea soil. Background Technology

[0002] In deep-sea oil and gas extraction, pipelines used to transport oil and gas are typically laid on the seabed. These pipelines interact with deep-sea soft soil, and the mechanical properties of this soft soil play a crucial role in the safety and stability of the pipelines. Due to its unique sedimentary environment, deep-sea soft soil exhibits significantly different physical and mechanical properties compared to terrestrial and shallow-sea soils.

[0003] In the deep sea surface, soil is typically in an extremely weak and unconsolidated state, exhibiting a fluid-like, sparse texture. Soil particles are mostly suspended in pore water, resulting in a loose structure and very low strength. As depth increases, the overlying pressure gradually increases, and under continuous consolidation, the soil's water content decreases, the void ratio decreases, and the soil particles gradually transition from a "suspended state" to a "contact state," forming a stable skeletal structure. This transformation from "suspended" to "contact" is not only a fundamental change in structural behavior but also leads to a significant increase in soil strength and a qualitative leap in its mechanical behavior.

[0004] However, although the state transitions of soil particles have a decisive influence on the mechanical properties of deep-sea soils, the academic community has yet to establish a unified and clear method for distinguishing these states and a standard for defining them. This theoretical gap severely restricts the accurate description of the mechanical behavior of deep-sea soils and the establishment of constitutive models, and also hinders the further development of deep-sea engineering design and construction technologies. Therefore, in order to promote the development of deep-sea soil mechanics and support the secure development of deep-sea energy, it is urgent to construct an experimental method to distinguish the dispersed states of deep-sea soils. Summary of the Invention

[0005] To address the aforementioned technical problems, the present invention aims to provide a test method for distinguishing the state of deep-sea soil, and the specific technical solution adopted is as follows:

[0006] In a first aspect, the present invention provides a test method for distinguishing the state of deep-sea soil, comprising the following steps:

[0007] Deep-sea soil was remodeled, and equal amounts of remodeled soil were uniformly mixed with different masses of water to obtain soil samples with different initial high water content. The volume of turbid liquid in the remodeled soil of the different initial high water content soil samples was obtained at various times during the free settling process and after the settling stabilized.

[0008] Based on the volume of the turbid liquid, the water content of the turbid liquid is determined, and based on the change relationship of the water content of the turbid liquid, the initial water content for distinguishing soil states is determined.

[0009] Shear rate strength tests were performed on soil samples with different initial high water content to obtain the relationship between soil yield stress and water content.

[0010] The initial moisture content of the soil in the different soil states is compared and verified with the relationship between the soil yield stress and moisture content to determine the final moisture content of the soil in the different soil states.

[0011] In conjunction with the first aspect mentioned above, some possible implementation methods for reshaping deep-sea soil include:

[0012] Salt washing treatment of deep-sea soil;

[0013] The wet soil after salt washing is dried at a set drying temperature.

[0014] After the dried soil is crushed and sieved, the undersized dry soil is collected to obtain reconstituted soil from the deep sea.

[0015] In conjunction with the first aspect above, among some possible implementation methods, determining the initial moisture content that distinguishes soil states includes:

[0016] For soil samples with different initial high water content, determine the initial water content and final water content of the turbid liquid in the soil samples with different initial high water content;

[0017] Based on the initial moisture content and the final moisture content, determine the final moisture content data points corresponding to soil samples with different initial high moisture content;

[0018] A straight line is fitted to the last moisture content data points to obtain the fitted straight line;

[0019] The intersection point of the fitted straight line and the set curve is determined, and based on the initial moisture content and the final moisture content corresponding to the intersection point, the initial moisture content for distinguishing soil states is determined.

[0020] In conjunction with the first aspect above, in some possible implementations, based on the initial moisture content and the final moisture content, the final moisture content data points corresponding to soil samples with different initial high moisture contents are determined, including:

[0021] Construct a two-dimensional coordinate system, with the final moisture content as the vertical coordinate and the logarithm of the initial moisture content as the horizontal coordinate.

[0022] Based on the initial water content and final water content of the turbid liquid from the initial high water content soil sample, data points are determined in the two-dimensional coordinate system, thereby obtaining the final water content data points corresponding to different initial high water content soil samples.

[0023] In conjunction with the first aspect mentioned above, in some possible implementations, the set curve is the curve in the two-dimensional coordinate system corresponding to the final moisture content being equal to the initial moisture content.

[0024] In conjunction with the first aspect above, in some possible implementations, shear rate strength tests are performed on soil samples with different initial high water content to obtain the relationship between soil yield stress and water content, including:

[0025] For soil samples with different initial high water content, constant shear rate or variable shear rate strength tests were conducted to obtain the yield stress of soil samples with different initial high water content.

[0026] Based on the initial water content and yield stress of soil samples with different initial high water content, the yield stress and water content data points corresponding to soil samples with different initial high water content are determined.

[0027] Curve fitting is performed on the yield stress and water content data points to obtain the relationship between soil yield stress and water content.

[0028] In conjunction with the first aspect above, in some possible implementations, the moisture content of the soil in the differentiated soil state is compared and verified with the relationship between the soil yield stress and moisture content to determine the final moisture content of the final differentiated soil state, including:

[0029] Based on the relationship between soil yield stress and water content, the water content range corresponding to the segment where the yield stress decreases significantly is determined.

[0030] The initial moisture content of the soil in the distinguishing soil state is determined to be within the moisture content range corresponding to the section where the yield stress decreases significantly. If it is within the moisture content range corresponding to the section where the yield stress decreases significantly, then the initial moisture content of the soil in the distinguishing soil state is taken as the final moisture content of the soil in the distinguishing soil state.

[0031] In conjunction with the first aspect mentioned above, in some possible implementations, equal amounts of remolded soil are uniformly mixed with at least four portions of water of different masses to obtain soil samples with different initial high water content.

[0032] Secondly, the present invention also provides an experimental system for distinguishing deep-sea soil conditions, including a memory and a processor. The memory is used to store executable computer program code, and the processor is used to call and run the executable computer program code from the memory, causing the system to perform the methods in the first aspect or any possible implementation thereof.

[0033] Thirdly, the present invention also provides a computer program product comprising: computer program code, which, when run on a computer, causes the computer to perform the method described in the first aspect or any possible implementation thereof.

[0034] Fourthly, the present invention also provides a computer-readable storage medium storing computer program code that, when executed on a computer, causes the computer to perform the method described in the first aspect or any possible implementation thereof.

[0035] This invention offers the following advantages: By reshaping deep-sea soil, equal volumes of reshaped soil are uniformly mixed with varying masses of water to obtain soil samples with different initial high water content. The volume of turbid liquid in these samples is then measured at various points during free settling and after settling stabilization. Based on the volume of the turbid liquid, its water content is determined, and the initial water content for different soil states is determined based on the variation of the turbid liquid's water content. Shear rate strength tests are then performed on soil samples with different initial high water content to obtain the relationship between soil yield stress and water content. The initial water content for different soil states is compared with the relationship between soil yield stress and water content to determine the final water content for each soil state. This invention, by comparing the relationship between soil yield stress and water content with the water content obtained from free settling tests, effectively improves the accuracy of water content testing for deep-sea soil in different soil states. It also possesses high operability and repeatability, facilitating industry-wide standardization. Attached Figure Description

[0036] To more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a flowchart illustrating a test method for distinguishing the state of deep-sea soil according to an embodiment of the present invention;

[0038] Figure 2 This is an example diagram of the graduated cylinder structure used in an embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of the constant temperature and humidity chamber structure according to an embodiment of the present invention;

[0040] Figure 4This is a schematic diagram of the rheometer structure according to an embodiment of the present invention;

[0041] Figure 5 This is a schematic diagram of the free settling test results according to an embodiment of the present invention;

[0042] Figure 6 A schematic diagram of the rheological test results of an embodiment of the present invention:

[0043] In the diagram: 1-Insulation layer, 2-Air supply and return vents, 3-Sealed door, 4-Heating and cooling system, 5-Liftable measuring head, 6-Test fixture, 7-Cross plate, 8-Temperature control system, 9-Main frame, 10-Cold bath, 11-Air compressor, 12-Data acquisition system. Detailed Implementation

[0044] To clearly illustrate the technical features of this solution, the invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0045] Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While some embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the invention. It should be understood that the accompanying drawings and embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the invention.

[0046] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0047] The term "comprising" and its variations as used herein are open-ended inclusions, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Definitions of other terms will be given in the description below.

[0048] It should be noted that the concepts of "first" and "second" mentioned in this invention are only used to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0049] Although operations or steps are described in a specific order in the accompanying drawings in the embodiments of the present invention, this should not be construed as requiring these operations or steps to be performed in the specific order or serial order shown, or requiring all of the shown operations or steps to be performed to obtain the desired result. In the embodiments of the present invention, these operations or steps may be performed serially; they may be performed in parallel; or a portion of these operations or steps may be performed.

[0050] The following will describe in detail, with reference to the accompanying drawings, a test method for distinguishing the state of deep-sea soil provided by an embodiment of the present invention.

[0051] Figure 1 This diagram illustrates the basic flow of a test method for distinguishing deep-sea soil conditions according to an embodiment of the present invention. Figure 1 As shown, the method specifically includes the following steps:

[0052] Step S100: Reshape the deep-sea soil by uniformly mixing equal amounts of reshaped soil with different masses of water to obtain soil samples with different initial high water content, and obtain the volume of the reshaped soil in the different initial high water content soil samples at various times during free settling and the volume of the turbid liquid after settling stabilization.

[0053] Reconstituted soil is obtained by reshaping deep-sea soil. During the reshaping process, care should be taken to avoid damaging the soil particle composition and biomass structure. A certain amount of reconstituted soil is uniformly mixed with different masses of water, and the reconstituted soil is allowed to settle freely. The volume of turbid liquid at various points during the free settling process and after settling stabilization are recorded.

[0054] Deep-sea water is a mixture of various soluble salts, primarily sodium chloride. The chemical composition and content of the pore solution in marine soil are basically the same as those in seawater, with sodium chloride being the main component. Since the concentration of the salt solution has a significant impact on the free settling of soil, and the salt solution concentration changes when soil with the same salt content is mixed with different masses of water, it is necessary to remove the soluble salts from the soil before reshaping deep-sea soil.

[0055] In a specific example, such as Figure 1 As shown, the reshaping process of deep-sea soil includes the following steps: First, the deep-sea soil undergoes salt washing treatment, which involves repeatedly washing the soil with distilled water to remove soluble salts. Second, the salt-washed wet soil is dried at a set drying temperature, which should be controlled below 60℃ to prevent damage to the organic matter. Finally, the dried soil is crushed and sieved, and the undersized dry soil powder is collected to obtain the reshaped deep-sea soil. This is achieved by carefully crushing the dried soil with a hammer or millstone, then passing it through a 2mm sieve, and collecting the undersized dry soil.

[0056] In a specific example, after reshaping deep-sea soil, since temperature has a significant impact on the free settlement of the soil, it is necessary to first... Figure 3 The constant temperature and humidity chamber is set to a constant temperature T. For example... Figure 3 As shown, the constant temperature and humidity chamber consists of an insulation layer 1, air supply and return vents 2, a sealed door 3, and a heating and cooling system 4. The insulation layer 1 is used to prevent excessive heat exchange between the constant temperature and humidity chamber and the outside environment, and the heating and cooling system 4 is used to raise and lower the temperature to the specified temperature.

[0057] Next, pour the same amount of remolded soil into each container. Figure 2 The graduated cylinder shown is used to uniformly mix different masses of water to prepare soil samples with different initial high water content. This involves uniformly mixing equal amounts of remolded soil with at least four portions of water of different masses to obtain soil samples with different initial high water content; at least four soil samples are required. The graduated cylinder is placed... Figure 3 In a constant temperature and humidity chamber, once the soil temperature in the graduated cylinder matches and remains constant with the chamber's preset temperature T, it is stirred again until homogeneous. The remolded soil is then allowed to settle freely, and the volume of the turbid liquid at various points during the free settling process and after settling is stable is recorded. Because the initial settling speed is rapid and highly variable, high-frequency recording is required to capture these changes; in the later, slower settling phase, as the soil enters consolidation, changes are smaller, and low-frequency recording suffices. Settling stability is defined as almost no change in the volume of the turbid liquid; for example, a change of less than 1 mm on the graduated cylinder scale over 24 hours is considered a stable settling condition.

[0058] Step S200: Based on the volume of the turbid liquid, determine the water content of the turbid liquid, and based on the change in the water content of the turbid liquid, determine the initial water content to distinguish the soil state.

[0059] Based on the volumes of turbid liquid at various time points during the free settling process of remolded soil samples with different initial high moisture content, and after settling stabilization, the water content of the turbid liquid at each time point and after settling stabilization is determined. The formula for calculating the water content w from the turbid liquid volume V is as follows:

[0060]

[0061] in, For the quality of dry soil, The specific gravity of soil. Let V be the density of water, and V be the volume of the turbid liquid.

[0062] Furthermore, based on the changes in the water content of the turbid liquid from soil samples with different initial high water content, the initial water content for distinguishing soil states was determined.

[0063] In a specific example, firstly, for soil samples with different initial high water content, the initial water content of the turbid liquid from those soil samples is determined. and final moisture content Secondly, based on the initial and final moisture contents, the moisture content data points corresponding to soil samples with different initial high moisture contents are determined, i.e., a two-dimensional coordinate system is constructed, with the final moisture content as the reference point. The vertical coordinate is in a two-dimensional coordinate system, and the initial moisture content is used as the reference value. logarithm The x-axis represents the abscissa in a two-dimensional coordinate system. The initial and final water content of the turbid liquid from the initial high-water-content soil sample are used to determine data points in the two-dimensional coordinate system. This allows us to obtain water content data points corresponding to soil samples with different initial high water content. Next, a straight line is fitted to all moisture content data points to obtain a fitted straight line. Finally, the intersection point of this fitted straight line and the set curve is determined. This set curve is the curve in a two-dimensional coordinate system corresponding to the final moisture content equaling the initial moisture content; that is, the curve... The intersection point This means that when the initial moisture content of the soil is greater than the moisture content at this point, soil particles will settle and the volume of the turbid liquid will decrease; when the initial moisture content of the soil equals the final moisture content, it means that soil particles hardly settle, and the soil reaches a contact state. Therefore, this intersection point... This is the dividing point between the "suspended state" and the "contact state" of the soil. Based on the initial and final moisture contents corresponding to this intersection point, the initial moisture content that distinguishes the soil states is determined, as shown below. Figure 5 As shown, the intersection point The corresponding x-axis or y-axis is used as the water content to distinguish the soil state. .

[0064] Step S300: Perform constant shear rate or variable shear rate strength tests on soil samples with different initial high water content to obtain the relationship between soil yield stress and water content.

[0065] For soil samples with the same initial high water content as those in step S100, constant shear rate or variable shear rate strength tests are performed to obtain the yield stress of soil samples with different initial high water content. Then, combined with the water content (initial water content) of soil samples with different initial high water content, the relationship between soil yield stress and water content can be obtained.

[0066] In a specific example, the same amount of remolded soil as in step S100 is poured into a measuring cylinder and mixed evenly with water to prepare another set of soil samples with different initial high water content. At least four soil samples are prepared. The soil samples with different initial high water content from this set are then poured into a container as shown in the figure. Figure 4 In the soil sample cup of the rheometer shown, the temperature was simultaneously adjusted... Figure 4The cold bath 10 and the temperature control system 8 in the rheometer adjust the temperature inside the soil sample cup to a constant temperature T. In the structure of the rheometer as shown in Figure 4 , the liftable measuring head 5 can freely control the vane 7 to move out of the soil sample cup. The test fixture 6 can ensure that the vane 7 moves with the liftable measuring head 5. The vane 7 shears the soil mass in the soil sample cup. The temperature control system 8 can precisely control the temperature inside the soil sample cup. The main frame 9 is used to support the liftable measuring head 5. The cold bath 10 is used to roughly control the temperature inside the soil sample cup. The air compressor 11 provides the shear force required for the test. The data acquisition system 12 is used to collect shear data. Place the soil sample cup into this rheometer. In order to make the soil sample uniform, for soil samples with different initial high moisture contents, pre-shear at a certain rate for 5 minutes, and then conduct constant shear rate or variable shear rate strength tests. The soil yield stress of soil samples with different initial high moisture contents is obtained through the tests . Obtain the initial moisture content of soil samples with different initial high moisture contents . Furthermore, based on the initial moisture content and the yield stress of soil samples with different initial high moisture contents, determine the yield stress and moisture content data points corresponding to soil samples with different initial high moisture contents, that is, use the initial moisture content as the abscissa, and use the soil yield stress as the ordinate to determine the yield stress and moisture content data points corresponding to soil samples with different initial high moisture contents . Perform curve fitting on all data points corresponding to soil samples with different initial high moisture contents , such as connecting all adjacent data points with straight line segments, so as to obtain the relationship between the soil yield stress and the moisture content change, as shown in Figure 6 .

[0067] Step S400: Compare and verify the initial moisture content for distinguishing soil states with the relationship between the soil yield stress and the moisture content change, and determine the final moisture content for distinguishing soil states.

[0068] According to the relationship between the soil yield stress and the moisture content change, the soil yield stress decreases as the moisture content of the soil increases. When the yield stress increases significantly, it indicates that the state of the soil changes from the "contact state" to the "suspension state". Therefore, according to the relationship between the soil yield stress and the moisture content change, compare and verify it with the moisture content range obtained from the free settlement test, and finally determine the moisture content for distinguishing soil states.

[0069] In a specific example, first, based on the relationship between the soil yield stress and the moisture content change, determine the moisture content range corresponding to the section where the yield stress decreases significantly , that is: determine the section with a sudden and sharp decrease (the straight line segment corresponding to the sharp change in slope) in the relationship between the soil yield stress and the moisture content change. This section corresponds to the minimum moisture content (initial moisture content) and the maximum moisture content (initial moisture content) Thus, the moisture content range corresponding to the section where the yield stress decreases significantly is obtained. Secondly, determine whether the initial moisture content for differentiating soil states falls within the moisture content range corresponding to the significant decrease in yield stress, i.e., the above-mentioned method based on the intersection point... The determined soil moisture content for different soil conditions The moisture content range corresponding to this significant decrease in yield stress Perform a comparison. For example... Figure 6 As shown, moisture content It should be located in the moisture content range Inside, and based on the above intersection point The determined soil moisture content for different soil conditions Moisture content is the final criterion for determining soil condition. If Not located If the problem persists, repeat the experiment and analyze the cause.

[0070] Based on the same inventive concept, embodiments of the present invention also provide a test system for distinguishing deep-sea soil conditions. The system includes: a memory, a processor, and computer program code stored in the memory and running on the processor. When the processor executes the computer program code, the system can perform any of the aforementioned test methods for distinguishing deep-sea soil conditions.

[0071] In this embodiment of the invention, the system can be divided into functional modules according to the above method example. For example, each module can correspond to a separate functional module, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware. It should be noted that the module division in this embodiment is illustrative and only represents one logical functional division. In actual implementation, there may be other division methods.

[0072] Based on the same inventive concept, embodiments of the present invention also provide a computer program product, which includes: computer program code, which, when run on a computer, causes the computer to execute any of the aforementioned test methods for distinguishing the state of deep-sea soil.

[0073] Based on the same inventive concept, embodiments of the present invention also provide a computer-readable storage medium storing computer program code, which, when executed on a computer, causes the computer to perform any of the aforementioned test methods for distinguishing the state of deep-sea soil.

[0074] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A test method for distinguishing the state of deep-sea soil, characterized in that, Includes the following steps: Deep-sea soil was remodeled, and equal amounts of remodeled soil were uniformly mixed with different masses of water to obtain soil samples with different initial high water content. The volume of turbid liquid in the remodeled soil of the different initial high water content soil samples was obtained at various times during the free settling process and after the settling stabilized. Based on the volume of the turbid liquid, the water content of the turbid liquid is determined, and based on the change relationship of the water content of the turbid liquid, the initial water content for distinguishing soil states is determined. Shear rate strength tests were performed on soil samples with different initial high water content to obtain the relationship between soil yield stress and water content. The initial moisture content of the soil in the different soil states is compared and verified with the relationship between the yield stress of the soil and the moisture content to determine the final moisture content of the soil in the different soil states. Determine the initial moisture content to differentiate soil states, including: For soil samples with different initial high water content, determine the initial water content and final water content of the turbid liquid in the soil samples with different initial high water content; Based on the initial moisture content and the final moisture content, determine the final moisture content data points corresponding to soil samples with different initial high moisture content; A straight line is fitted to the last moisture content data points to obtain the fitted straight line; Determine the intersection point of the fitted straight line and the set curve, and based on the initial moisture content and the final moisture content corresponding to the intersection point, determine the initial moisture content that distinguishes the soil state; The initial moisture content of the differentiated soil states is compared and verified with the relationship between the soil yield stress and moisture content to determine the final moisture content of the differentiated soil states, including: Based on the relationship between soil yield stress and water content, the water content range corresponding to the segment where the yield stress decreases significantly is determined. Determine whether the initial moisture content of the soil in the differentiated state is within the moisture content range corresponding to the section where the yield stress decreases significantly. If it is within the moisture content range corresponding to the section where the yield stress decreases significantly, then the initial moisture content of the soil in the differentiated state is taken as the final moisture content of the soil in the differentiated state. Based on the initial moisture content and the final moisture content, determine the final moisture content data points corresponding to soil samples with different initial high moisture content, including: Construct a two-dimensional coordinate system, with the final moisture content as the vertical coordinate and the logarithm of the initial moisture content as the horizontal coordinate. Based on the initial water content and final water content of the turbid liquid from the initial high water content soil sample, data points are determined in the two-dimensional coordinate system to obtain the final water content data points corresponding to different initial high water content soil samples. The set curve is the curve in the two-dimensional coordinate system corresponding to the final moisture content being equal to the initial moisture content.

2. The test method for distinguishing deep-sea soil conditions according to claim 1, characterized in that, Reshaping deep-sea soil includes: Salt washing treatment of deep-sea soil; The wet soil after salt washing is dried at a set drying temperature. After the dried soil is crushed and sieved, the undersized dry soil is collected to obtain reconstituted soil from the deep sea.

3. The test method for distinguishing deep-sea soil conditions according to claim 1, characterized in that, Shear rate strength tests were conducted on soil samples with different initial high water content to obtain the relationship between soil yield stress and water content, including: For soil samples with different initial high water content, constant shear rate or variable shear rate strength tests were conducted to obtain the yield stress of soil samples with different initial high water content. Based on the initial water content and yield stress of soil samples with different initial high water content, the yield stress and water content data points corresponding to soil samples with different initial high water content are determined. Curve fitting is performed on the yield stress and water content data points to obtain the relationship between soil yield stress and water content.

4. The test method for distinguishing deep-sea soil conditions according to claim 1, characterized in that, Equal amounts of remolded soil were uniformly mixed with at least four portions of water of different masses to obtain soil samples with different initial high water content.

Images