A temperature-controlled triaxial loading device for curing soil samples in a multi-ion marine environment and a method of using the same

Abstract

This invention discloses a triaxial loading device and its method for using a solidified soil sample in a temperature-controlled multi-ion marine environment. The device includes a pressure chamber, a loading mechanism, a storage tank, and a heating rod. The pressure chamber contains a sample placement space for mounting solidified soil samples. The loading mechanism includes a loading rod positioned on the solidified soil sample to apply a load. The storage tank contains a multi-ion solution composed of chloride, sulfate, and magnesium ions, connected to the sample placement space within the pressure chamber via an ion solution tube, providing a multi-ion marine environment for the solidified soil sample within the space. The heating rod is positioned on the inner wall of the sample placement space within the pressure chamber to heat the solidified soil sample. This device enables triaxial loading tests on solidified soil samples in a temperature-controlled multi-ion marine environment.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering testing technology, specifically to a triaxial loading device for solidified soil samples in a temperature-controlled multi-ion marine environment and its usage method. Background Technology

[0002] In geotechnical testing, triaxial apparatuses can be used to conduct triaxial compression tests, including consolidated drained tests and consolidated undrained tests, and are commonly used to measure the shear properties of soil. The pressure chamber is one of the core components of a triaxial apparatus, and its main function is to create a stable and controllable consolidation environment for the soil sample, thereby simulating the three-dimensional constrained stress state that the soil experiences in actual engineering applications.

[0003] In coastal engineering construction, marine resource development, and coastal protection, the study of the mechanical properties of solidified soil is crucial. Due to the complex multi-ion system present in the marine environment, such as chloride, sulfate, and magnesium ions, these ions can react physicochemically with solidified soil, significantly affecting its strength, deformation characteristics, and durability. This can easily lead to deterioration in the strength, permeability, and compressibility of the solidified soil, ultimately causing structural instability and failure. However, conventional triaxial loading devices are mainly used to simulate the mechanical properties of soil in terrestrial environments and have not simulated the complex mechanical effects of multi-ion marine erosion environments on soil, especially solidified soil based on solid waste. The evolution of the shear mechanical properties of solidified soil based on solid waste under multi-ion marine erosion environments remains unclear. Therefore, simulating the mechanical response of solidified soil in multi-ion marine environments is of great significance for ensuring the safety and stability of marine engineering structures.

[0004] Currently, traditional triaxial apparatuses used to simulate the mechanical response of solidified soil in multi-ion marine environments have limitations in terms of test condition settings. They can typically only be used for testing at room temperature, failing to simulate the temperature variations in actual engineering environments. However, in real-world engineering scenarios, the temperature environment of solidified soil is complex and variable, rarely maintaining a constant room temperature, which can alter the properties of the solidified soil. For example, in road engineering, the solidified soil base layer beneath the pavement experiences significant temperature fluctuations due to solar radiation, seasonal changes, and diurnal temperature variations. In building foundation engineering, solidified soil at different depths underground is also subject to specific temperature environments due to geothermal gradients and the influence of surrounding heat sources (such as heating pipelines). Relying solely on triaxial apparatuses operating at room temperature to conduct shear characteristic tests on solidified soil cannot comprehensively and accurately reflect the true shear performance of solidified soil under complex actual temperature environments, resulting in inaccurate test results.

[0005] Furthermore, traditional triaxial apparatuses require repeated disassembly and reassembly of the pressure chamber during experiments, a cumbersome process involving components such as sealing devices, pressure transmission lines, pressure sensors, and the chamber shell. Moreover, the placement of the pressure chamber can be affected by minor vibrations or collisions, causing soil sample displacement. Since the accuracy of soil sample positioning directly impacts the accuracy of stress-strain measurements and the reliability of test results, any deviation necessitates disassembling the pressure chamber and readjusting and calibrating the soil sample, significantly impacting experimental efficiency. Meanwhile, compared to undisturbed soil, solidified soil is more stable and rigid, requiring no auxiliary devices to place stably on the pedestal and is less prone to collapse or tipping. Therefore, modifying the pressure chamber to a hinged design facilitates the filling and testing of solidified soil, significantly improving experimental efficiency.

[0006] The existing invention patent with application number 201710445970.6, entitled "Temperature-Controlled Triaxial Loading Device for Unsaturated Soil under Dry-Wet Cycles," only simulates ordinary environments under temperature changes, failing to simulate multi-ion marine erosion environments at different temperatures. Given this, to simulate actual multi-ion environments in the ocean and real-world engineering temperatures, improve experimental efficiency and accuracy, and provide reliable experimental data support for materials research and engineering design in the field of marine engineering, the development of a temperature-controlled triaxial loading device and pressure chamber for solidified soil samples in a multi-ion marine environment is particularly important.

[0007] In summary, there is currently a lack of equipment for triaxial loading of solidified soil samples in a temperature-controlled, multi-ion marine environment. Summary of the Invention

[0008] To address the aforementioned problems, the purpose of this invention is to provide a triaxial loading device and its usage method for solidified soil samples in a temperature-controlled, multi-ion marine environment, thereby solving the current lack of a device for triaxial loading of solidified soil samples in a temperature-controlled, multi-ion marine environment.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] In a first aspect, the present invention discloses a triaxial loading device for solidified soil samples in a temperature-controlled multi-ion marine environment, comprising: The pressure chamber has a built-in sample setting space for installing solidified soil samples. A loading mechanism includes a loading rod disposed on a solidified soil sample for applying a load to the solidified soil sample; The storage tank contains a multi-ion solution composed of chloride ions, sulfate ions, and magnesium ions. It is connected to the sample setting space of the pressure chamber through an ion solution tube, providing a multi-ion marine environment for the solidified soil sample in the sample setting space. A heating rod is installed on the inner wall of the sample setting space in the pressure chamber to heat the solidified soil sample in the sample setting space, thereby regulating the temperature of the environment around the solidified soil sample.

[0011] Furthermore, the loading mechanism also includes a base, a support frame, and a linear motor. The support frame includes a crossbeam and two support rods. The two support rods are mounted on the base, and the two ends of the crossbeam are mounted on the two support rods. The housing of the linear motor is fixedly connected to the middle of the crossbeam via a connecting rod; The output shaft of the linear motor is fixedly connected to the loading rod; The solidified soil sample is sandwiched between the bottom end of the loading rod and the bottom of the pressure chamber.

[0012] Furthermore, the pressure chamber includes a base, four side plates and a top plate. The four side plates are connected end to end to form a circumferential side with a rectangular cross-section. The base and the top plate are respectively located at the bottom and top of the circumferential side to form a sealed pressure chamber. A test pedestal is provided on the base, and the loading rod passes through the top plate with the bottom end of the loading rod opposite to the test pedestal. A space is reserved between the bottom end of the loading rod and the test pedestal to form the sample setting space, which is used to set solidified soil samples.

[0013] Furthermore, a pad is sandwiched between the bottom end of the loading rod and the top end of the solidified soil sample.

[0014] Furthermore, a sealing limiting plate is provided on the outer wall of the top plate.

[0015] Furthermore, one of the four side plates of the pressure chamber is configured as a pressure chamber door; the pressure chamber door is equipped with an observation window.

[0016] Furthermore, the heating rod is equipped with a temperature controller; the pressure chamber is equipped with a temperature detector, which is located on the top plate of the pressure chamber and is connected to the interior of the pressure chamber.

[0017] Furthermore, a pressure pump is installed on the ion solution tube; a valve is also installed on the ion solution tube; and a conductivity meter is installed on the storage tank.

[0018] Furthermore, a vent pipe is provided on the top plate of the pressure chamber, and an exhaust valve is configured on the vent pipe.

[0019] Secondly, the present invention also discloses a method for using the above-mentioned triaxial loading device for solidified soil samples in a temperature-controlled multi-ion marine environment, including: Step 1: Install the solidified soil sample in the sample setting space of the pressure chamber; Step 2: Start the pressurization pump to inject the multi-ion solution composed of chloride ions, sulfate ions, and magnesium ions stored in the storage tank into the pressure chamber to apply confining pressure until the confining pressure stabilizes, then close the valve. Step 3: Turn on the temperature controller and heat the pressure chamber through the heating rod. Monitor the temperature inside the pressure chamber in real time until the required test temperature is reached. Adjust the temperature in time through the temperature controller. After the temperature detector value is constant, wait 0.5 to 1 hour to ensure that the temperature inside the pressure chamber is uniform and stable. Step 4: Start the linear motor and apply a vertical load to the solidified soil sample through the loading mechanism to conduct a triaxial loading test on the solidified soil sample in a temperature-controlled multi-ion marine environment.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: (I) This invention discloses a triaxial loading device for solidified soil samples in a temperature-controlled multi-ion marine environment, comprising a pressure chamber, a loading mechanism, a storage tank, and a heating rod. The pressure chamber contains a sample setting space for mounting solidified soil samples. The loading mechanism includes a loading rod positioned on the solidified soil sample to apply a load. The storage tank contains a multi-ion solution composed of chloride, sulfate, and magnesium ions, connected to the sample setting space within the pressure chamber via an ion solution tube, providing a multi-ion marine environment for the solidified soil sample within the sample setting space. The heating rod is positioned on the inner wall of the sample setting space within the pressure chamber to heat the solidified soil sample, thereby regulating the temperature of the surrounding environment. The device disclosed in this invention enables triaxial loading tests on solidified soil samples in a temperature-controlled multi-ion marine environment.

[0021] (II) This invention discloses a method for using a triaxial loading device for solidified soil samples in a temperature-controlled multi-ion marine environment, comprising: Step 1: Installing the solidified soil sample in the sample setting space of the pressure chamber; Step 2: Starting the pressurization pump to inject the multi-ion solution composed of chloride ions, sulfate ions, and magnesium ions stored in the storage tank into the pressure chamber for confining pressure loading until the confining pressure stabilizes and then closing the valve; Step 3: Turning on the temperature controller to heat the pressure chamber through the heating rod, monitoring the temperature inside the pressure chamber in real time until the required test temperature is reached, and adjusting the temperature in a timely manner through the temperature controller. After the temperature detector value becomes constant, wait 0.5-1 hour to ensure that the temperature inside the pressure chamber is uniform and stable; Step 4: Starting the linear motor to apply a vertical load to the solidified soil sample through the loading mechanism to realize the triaxial loading test of the solidified soil sample in a temperature-controlled multi-ion marine environment.

[0022] Furthermore, the present invention also has the following advantages: 1. This invention addresses the limitations of existing triaxial apparatuses, which suffer from significant data fluctuations in soil shear properties and can only perform ambient temperature testing. It provides a temperature-controlled triaxial loading device and pressure chamber for solidified soil samples in a multi-ion marine environment. This device enables temperature control and mechanical loading under complex multi-ion marine conditions, simulating the stress state of solidified soil in real-world environments and testing its shear properties. Developing a temperature-controlled triaxial loading device and pressure chamber for solidified soil samples in a multi-ion marine environment is crucial for simulating real-world multi-ion environments and actual engineering temperature conditions, improving experimental efficiency and accuracy, and providing reliable experimental data support for materials research and engineering design in the marine engineering field.

[0023] 2. The present invention adds a temperature-changing device, which changes the temperature of the internal environment of the pressure chamber through a heating rod, and can monitor and adjust the temperature in real time during the test, so as to more realistically simulate the actual environment of the solidified soil.

[0024] 3. The present invention uses an insulating clamp to fix the heating rod, ensuring that the heating rod will not be displaced due to factors such as pressure changes inside the pressure chamber or vibration caused by sample deformation, and will always be maintained in the optimal heating position, thereby achieving efficient and uniform heating of the internal environment of the pressure chamber.

[0025] 4. The liquid storage tank of the present invention can realistically reproduce the multi-ion marine environment, so that the soil and the ion solution can be in full and stable contact, and the process and mechanism of the effect of ions on the strength and stability of solidified soil in complex marine environment can be studied.

[0026] 5. This invention uses a pneumatic confining pressure saturation system, which effectively eliminates the influence of water on the solidified soil during the test, accelerates the application rate of confining pressure, speeds up the test process, and improves test efficiency.

[0027] 6. Compared to traditional methods, the swing-out pressure chamber door provides ample operating space for operators, making the filling and placement process more convenient and efficient. It also avoids the problem of solidified soil displacement caused by repeated disassembly and reassembly of the pressure chamber, ensuring the initial position accuracy of the sample and guaranteeing the accuracy of the test data. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the triaxial loading device for solidified soil samples in a temperature-controlled multi-ion marine environment provided in Embodiment 1 of the present invention; Figure 2 This is a structural schematic diagram of the pressure chamber provided in Embodiment 1 of the present invention.

[0029] Figure labeling: 100 - Solidified soil sample; 1-Pressure chamber; 10-Base; 11-Top plate; 12-Test bench; 13-Padded block; 14-Temperature detector; 15-Ventilation pipe; 16-Exhaust valve; 17-Pressure chamber door; 170-Observation window; 18-Lock; 2-Loading mechanism, 20-Base, 21-Support frame, 221-Crossbeam, 222-Support rod; 22-Loading rod, 23-Linear motor; 3-Storage tank, 30-Ion solution tube, 31-Pressure pump, 32-Valve, 33-Conductivity meter; 4-Heating rod. Detailed Implementation

[0030] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary 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 limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0031] To address the current lack of a device for triaxial loading of solidified soil samples in a temperature-controlled, multi-ion marine environment, this invention discloses a triaxial loading device for solidified soil samples in a temperature-controlled, multi-ion marine environment. The device includes a pressure chamber, a loading mechanism, a storage tank, and a heating rod. The pressure chamber contains a sample placement space for mounting solidified soil samples. The loading mechanism includes a loading rod positioned on the solidified soil sample to apply a load. The storage tank contains a multi-ion solution composed of chloride, sulfate, and magnesium ions, connected to the sample placement space within the pressure chamber via an ion solution tube, providing a multi-ion marine environment for the solidified soil sample within the space. The heating rod is positioned on the inner wall of the sample placement space within the pressure chamber to heat the solidified soil sample, thereby regulating the temperature of the surrounding environment. This invention enables triaxial loading tests on solidified soil samples in a temperature-controlled, multi-ion marine environment.

[0032] Example 1: A triaxial loading device for solidified soil samples in a temperature-controlled multi-ion marine environment Embodiment 1 of the present invention provides a triaxial loading device for solidified soil samples in a temperature-controlled multi-ion marine environment. Its structure will be described in detail below with reference to the accompanying drawings.

[0033] refer to Figure 1 and Figure 2 The triaxial loading device for solidified soil samples in a temperature-controlled multi-ion marine environment includes a pressure chamber 1, a loading mechanism 2, a liquid storage tank 3, and a heating rod 4.

[0034] Pressure chamber 1 has a built-in sample setting space for installing solidified soil sample 100. The loading mechanism 2 includes a loading rod 20, which is disposed on the solidified soil sample 100 and is used to apply a load to the solidified soil sample 100. The storage tank 3 contains a multi-ion solution composed of chloride ions, sulfate ions, and magnesium ions. It is connected to the sample setting space of the pressure chamber 1 through the ion solution tube 30, providing a multi-ion marine environment for the solidified soil sample 100 in the sample setting space. Heating rod 4 is installed on the inner wall of the sample setting space of the pressure chamber 1 to heat the solidified soil sample 100 in the sample setting space, thereby regulating the temperature of the environment around the solidified soil sample 100.

[0035] Specifically, the loading mechanism 2 also includes a base 21, a support frame 22, and a linear motor 23. The support frame 22 includes a crossbeam 221 and two support rods 222. The two support rods 222 are mounted on the base 21, and the two ends of the crossbeam 221 are mounted on the two support rods 222. More specifically, the crossbeam 221 and the support rods 222 are fixedly connected by bolts.

[0036] The housing of the linear motor 23 is fixedly connected to the middle part of the crossbeam 221 via a connecting rod 230; The output shaft of the linear motor 23 is fixedly connected to the loading rod 20; The solidified soil sample 100 is sandwiched between the bottom end of the loading rod 20 and the bottom of the pressure chamber 1.

[0037] Specifically, the pressure chamber 1 includes a base 10, four side plates and a top plate 11. The four side plates are connected end to end to form a circumferential side with a rectangular cross-section. The base 10 and the top plate 11 are respectively located at the bottom and top of the circumferential side to form a sealed pressure chamber 1. A test bench 12 is provided on the base 10, and the loading rod 20 passes through the top plate 11, with the bottom end of the loading rod 20 facing the test bench 12. A space is reserved between the bottom end of the loading rod 20 and the test bench 12 to form the sample setting space, which is used to set the solidified soil sample 100.

[0038] Preferably, a pad 13 is sandwiched between the bottom end of the loading rod 20 and the top end of the solidified soil sample 100.

[0039] In order to fix the loading rod 20, a sealing limiting plate 110 is provided on the outer wall of the top plate 11. Specifically, the sealing limiting plate 110 has a loading rod hole for the loading rod 20 to pass through.

[0040] More specifically, the sealing limit plate 110 is equipped with a nut and a rubber ring. As is common knowledge, the pressure chamber 23 can be sealed by adjusting the nut and fixing the rubber ring.

[0041] To facilitate the filling of solidified soil and other operations, save operation time, and improve test efficiency, one of the four side plates of the pressure chamber 1 is set as a pressure chamber door 17. Specifically, the left end of the pressure chamber door 17 is hinged to its adjacent left side plate by a pair of hinges 18, and the right end is connected to its adjacent right side plate by a pair of latches 19.

[0042] Specifically, the pressure chamber door 17 is a left-side swing-opening type, with a latch on the right side and a hinge on the left side connecting it to the side plate. A groove around the door is fitted with a sealing ring to ensure the chamber is airtight. The pressure chamber door 17 can achieve a tight seal, ensuring no gas leakage. A groove is formed on the inner wall of the pressure chamber door 17 to accommodate the sealing ring, effectively preventing gas leakage from the pressure chamber and maintaining stable pressure inside.

[0043] To facilitate observation of the solidified soil sample 100, the pressure chamber door 17 is equipped with an observation window 170. The observation window 170 is a transparent plate, allowing for continuous observation of the sample within the pressure chamber during the experiment. For example, high-strength acrylic sheets or tempered glass can be used. The pressure chamber door and the outer wall of the pressure chamber are made of the same stainless steel material.

[0044] To prevent the plate from cracking and leaking due to excessive pressure in the pressure chamber 1, which would affect the test results, the transparent plate of the observation window 170 is made of high-strength material.

[0045] Preferably, the heating rod 4 is equipped with a temperature controller; Furthermore, the pressure chamber 1 is equipped with a temperature detector 14, which is located on the top plate 11 of the pressure chamber 1 and is connected to the interior of the pressure chamber 1.

[0046] In order to continuously input the solution in the storage tank 3 into the pressure chamber 1, a pressure pump 31 is provided on the ion solution tube 30.

[0047] To prevent the solution in pressure chamber 1 from flowing back into storage tank 3, a valve 32 is also provided on the ion solution tube 30.

[0048] In order to monitor the type and concentration of ionic solutions, the storage tank 3 is equipped with a conductivity meter 33.

[0049] The conductivity meter 33 can set the amount of different ions to be added according to the concentration ratio of ions in the actual marine environment, and monitor the change of solution concentration in real time during the test. It can maintain the concentration stability by replenishing the corresponding ion solution to ensure the consistency of test conditions.

[0050] In order to expel the exhaust gas in the pressure chamber 1 in a timely manner, a vent pipe 15 is provided on the top plate 11 of the pressure chamber 1, and an exhaust valve 16 is configured on the vent pipe 15.

[0051] Specifically, the base 21, the base 10 of the pressure chamber 1, and the four side plates are all made of stainless steel. The crossbeam 221 and the support rod 3 are also made of stainless steel.

[0052] Example 2: Method of using a triaxial loading device for solidified soil samples in a temperature-controlled multi-ion marine environment Embodiment 2 of the present invention provides a method for using a triaxial loading device for solidified soil samples in a temperature-controlled multi-ion marine environment. The method employs the triaxial loading device for solidified soil samples in a temperature-controlled multi-ion marine environment as described in Embodiment 1. A multi-ion solution composed of chloride ions, sulfate ions, and magnesium ions is prepared in advance according to the actual ion concentration and ratio in the marine environment, and this multi-ion solution is stored in a storage tank 3. The method of use includes the following steps: Step 1: Install the solidified soil sample 100 in the sample setting space of the pressure chamber; Step 2: Start the pressurization pump 31 to inject the multi-ion solution composed of chloride ions, sulfate ions and magnesium ions stored in the storage tank 3 into the pressure chamber 1 to load the confining pressure until the confining pressure stabilizes, then close the valve 32. Step 3: Turn on the temperature controller and heat the pressure chamber 1 through the heating rod 4. Monitor the temperature inside the pressure chamber 1 in real time until the required test temperature is reached, and adjust the temperature in time through the temperature controller. After the value of the temperature detector 14 is constant, wait for 0.5 to 1 hour to ensure that the temperature inside the pressure chamber 1 is uniform and stable. Step 4: Start the linear motor 23 and apply a vertical load to the solidified soil sample 100 through the loading mechanism 2 to achieve a triaxial loading test on the solidified soil sample 100 in a temperature-controlled multi-ion marine environment.

[0053] Finally, 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; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A triaxial loading device for solidified soil samples in a temperature-controlled multi-ion marine environment, characterized in that, include Pressure chamber (1) has a built-in sample setting space for installing solidified soil samples (100). The loading mechanism (2) includes a loading rod (20) which is disposed on the solidified soil sample (100) for applying a load to the solidified soil sample (100); The storage tank (3) contains a multi-ion solution composed of chloride ions, sulfate ions and magnesium ions. It is connected to the sample setting space of the pressure chamber (1) through the ion solution tube (30) to provide a multi-ion marine environment for the solidified soil sample (100) in the sample setting space. A heating rod (4) is installed on the inner wall of the sample setting space of the pressure chamber (1) to heat the solidified soil sample (100) in the sample setting space, so as to regulate the temperature of the environment around the solidified soil sample (100).

2. The triaxial loading device for solidified soil samples in a temperature-controlled multi-ion marine environment according to claim 1, characterized in that, The loading mechanism (2) also includes a base (21), a support frame (22), and a linear motor (23). The support frame (22) includes a crossbeam (221) and two support rods (222). The two support rods (222) are mounted on the base (21), and the two ends of the crossbeam (221) are mounted on the two support rods (222). The housing of the linear motor (23) is fixedly connected to the middle part of the crossbeam (221) via a connecting rod (230); The output shaft of the linear motor (23) is fixedly connected to the loading rod (20); The solidified soil sample (100) is sandwiched between the bottom end of the loading rod (20) and the bottom of the pressure chamber (1).

3. The triaxial loading device for solidified soil samples in a temperature-controlled multi-ion marine environment according to claim 2, characterized in that, The pressure chamber (1) includes a base (10), four side plates and a top plate (11). The four side plates are connected end to end to form a rectangular circumferential side. The base (10) and the top plate (11) are respectively located at the bottom and top of the circumferential side to form a sealed pressure chamber (1). A test bench (12) is provided on the base (10), and the loading rod (20) passes through the top plate (11), with the bottom end of the loading rod (20) facing the test bench (12). A space is reserved between the bottom end of the loading rod (20) and the test bench (12) to form the sample setting space, which is used to set solidified soil samples (100).

4. The triaxial loading device for solidified soil samples in a temperature-controlled multi-ion marine environment according to claim 3, characterized in that, A pad (13) is sandwiched between the bottom end of the loading rod (20) and the top end of the solidified soil sample (100).

5. The triaxial loading device for solidified soil samples in a temperature-controlled multi-ion marine environment according to claim 3, characterized in that, A sealing limiting plate (110) is provided on the outer wall of the top plate (11).

6. The triaxial loading device for solidified soil samples in a temperature-controlled multi-ion marine environment according to claim 3, characterized in that, One of the four side plates of the pressure chamber (1) is configured as the pressure chamber door (17). The pressure chamber door (17) is equipped with an observation window (170).

7. The triaxial loading device for solidified soil samples in a temperature-controlled multi-ion marine environment according to claim 3, characterized in that, The heating rod (4) is equipped with a temperature controller; The pressure chamber (1) is equipped with a temperature detector (14), which is located on the top plate (11) of the pressure chamber (1) and is connected to the interior of the pressure chamber (1).

8. The triaxial loading device for solidified soil samples in a temperature-controlled multi-ion marine environment according to claim 5, characterized in that, A pressure pump (31) is provided on the ion solution tube (30); A valve (32) is also provided on the ion solution tube (30); The storage tank (3) is equipped with a conductivity meter (33).

9. The triaxial loading device for solidified soil samples in a temperature-controlled multi-ion marine environment according to claim 5, characterized in that, A vent pipe (15) is provided on the top plate (11) of the pressure chamber (1), and an exhaust valve (16) is provided on the vent pipe (15).

10. The method of using the triaxial loading device for solidified soil samples in a temperature-controlled multi-ion marine environment according to any one of claims 1-9, characterized in that, include: The solidified soil sample (100) is installed in the sample setting space of the pressure chamber; Start the pressurization pump (31) to inject the multi-ion solution composed of chloride ions, sulfate ions and magnesium ions stored in the storage tank (3) into the pressure chamber (1) to load the confining pressure until the confining pressure stabilizes and then close the valve (32). Turn on the temperature controller and heat the pressure chamber (1) through the heating rod (4). Monitor the temperature inside the pressure chamber (1) in real time until the required temperature for the test is reached. Adjust the temperature in time through the temperature controller. After the value of the temperature detector (14) is constant, wait for 0.5 to 1 hour to ensure that the temperature inside the pressure chamber (1) is uniform and stable. Start the linear motor (23) and apply a vertical load to the solidified soil sample (100) through the loading mechanism (2) to realize the triaxial loading test of the solidified soil sample (100) in a temperature-controlled multi-ion marine environment.

Images