Soil triaxial nuclear magnetic combined measurement device

Abstract

The utility model relates to the technical field of unsaturated soil strength and deformation characteristic testing, and discloses a soil triaxial nuclear magnetic combined testing device which comprises a base frame, a pressure chamber structure, a pressurizing structure and a nuclear magnetic tester, the pressure chamber structure is installed on the base frame, and a pressure chamber used for containing a soil sample to be detected is formed in the pressure chamber structure; the pressurizing structure is mounted on the base frame, and the output end of the pressurizing structure is inserted into the pressure chamber to apply axial pressure to the to-be-detected soil sample; the pressure chamber structure is sleeved with the nuclear magnetic tester, and the detection end of the nuclear magnetic tester right faces the pressure chamber. According to the structure, the nuclear magnetic tester, the pressure chamber structure, the pressurization structure and the nuclear magnetic tester are integrated, the sealing performance is better, real-time online detection is facilitated, and the influence of the pressurization structure on nuclear magnetic detection is reduced. And the diameter of the pressure chamber structure is reduced, so that the pressure chamber structure can be placed in a nuclear magnetism tester, and both nuclear magnetism test and triaxial experiment are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of unsaturated soil strength and deformation characteristic test, concretely relates to soil triaxial nuclear magnetic joint measuring device. BACKGROUND

[0002] Soil mechanics is a basic discipline of civil engineering and geology, which studies the mechanical properties and engineering characteristics of soil. The research and application of soil mechanics are of great significance for ensuring engineering safety and reducing engineering cost. Soil has the characteristics of discontinuity, heterogeneity, anisotropy and nonlinearity, which makes the behavior of soil under different stress conditions very complex.

[0003] In order to better understand and predict the behavior of soil, soil test such as unsaturated soil triaxial test is used, in which the pore structure characteristics, internal water distribution state and mechanical properties of soil sample will change when it is subjected to axial stress and surrounding pressure, but the traditional soil triaxial test at present cannot realize online monitoring of internal changes and pore changes of soil. UTILITY MODEL CONTENT

[0004] Therefore, the utility model provides a soil triaxial nuclear magnetic joint measuring device to solve the problem that the traditional soil triaxial test at present cannot realize online monitoring of internal changes and pore changes of soil.

[0005] In the first aspect, the utility model provides a soil triaxial nuclear magnetic joint measuring device, which comprises:

[0006] A base frame;

[0007] A pressure chamber structure is installed on the base frame, and a pressure chamber for accommodating the soil sample to be detected is formed in the pressure chamber structure;

[0008] A pressure structure is installed on the base frame, and the output end of the pressure structure is inserted into the pressure chamber to apply axial pressure to the soil sample to be detected;

[0009] A nuclear magnetic tester is sleeved outside the pressure chamber structure, and the detection end of the nuclear magnetic tester is opposite to the pressure chamber.

[0010] Beneficial effects: the nuclear magnetic tester, the pressure chamber structure, the pressure structure and the nuclear magnetic tester are integrated, the sealing property is better, real-time online detection is facilitated, the influence of the pressure structure on nuclear magnetic detection is reduced. And the diameter of the pressure chamber structure is reduced, so that it can be placed inside the nuclear magnetic tester, which meets the test of nuclear magnetic and the experiment of triaxial.

[0011] In an optional embodiment, the pressure chamber structure comprises a sample cylinder, a first base and a second base; the sample cylinder is provided with a cavity along the axial direction;

[0012] The first base and the second base are symmetrically arranged at two ends of the sample cylinder, and the first base, the second base and the sample cylinder enclose the cavity into a pressure chamber.

[0013] In an alternative embodiment, the pressure chamber structure further comprises a skeleton, which is in the shape of a cylinder, and is sleeved on the sample cylinder, and the two ends of the skeleton abut against the first base and the second base, respectively.

[0014] The inner diameter of the skeleton is greater than the outer diameter of the sample cylinder, so that an annular gap is formed between the skeleton and the sample cylinder; and the nuclear magnetic testing instrument is clamped with the skeleton.

[0015] Beneficial effects: The two ends of the skeleton abut against the first base and the second base, respectively, and the inner diameter of the skeleton is greater than the outer diameter of the sample cylinder, so that an annular gap is formed between the skeleton and the sample cylinder, which guarantees to reduce the influence of external temperature on the pressure chamber, insulates the sample temperature, and improves the data stability. According to the needs, the annular gap can be filled with thermal insulation materials. The testing end of the nuclear magnetic testing instrument is opposite to the pressure chamber, so as to obtain the best test results.

[0016] In an alternative embodiment, the pressurizing structure comprises:

[0017] A pressurizing piece is fixed on the base frame at the bottom end of the pressure chamber structure, and the pressurizing end of the pressurizing piece is adapted to face the pressure chamber.

[0018] A pressure sensor is fixed on the base frame at the top end of the pressure chamber structure.

[0019] A first piston top rod is installed at one end of the pressurizing end of the pressurizing piece, and the other end of the first piston top rod penetrates through the first base and extends into the pressure chamber, and the end of the first piston top rod away from the pressurizing piece is installed with a first sample plug.

[0020] A second piston top rod is connected at one end to the pressure sensor, and the other end of the second piston top rod penetrates through the second base and extends into the pressure chamber, and the end of the first piston top rod away from the pressure sensor is installed with a second sample plug.

[0021] The soil sample to be detected is adapted to be placed between the first sample plug and the second sample plug.

[0022] Beneficial effects: The pressurizing part is a hydraulic pump, which is fixed on the upper surface of the lower pressing plate close to the pressure chamber structure. The pressurizing end of the pressurizing part faces the pressure chamber, and the pressure sensor is fixed on the lower surface of the upper pressing plate close to the pressure chamber structure. The pressurizing part can withstand a pressure of 5 MPa, which improves the suitability of nuclear magnetic resonance. The pressure sensor is not directly connected to the pressure part and is arranged at the end of the pressurizing structure, which improves the stability and accuracy of the test.

[0023] In an alternative embodiment, the pressurizing structure further comprises a displacement sensor mounted on the first piston top rod.

[0024] Beneficial effects: The axial stress is measured by the pressure sensor, and the axial strain is measured by the displacement sensor. The measured values are used as feedback to control the system through a closed-loop control system to achieve full-automatic servo control and realize stress path or strain path control experiments.

[0025] In an alternative embodiment, a confining liquid inlet is formed in the first base, and a confining liquid outlet is formed in the second base. The confining liquid inlet and the confining liquid outlet are in communication with the pressure chamber.

[0026] In an alternative embodiment, a first counter-pressure channel is formed through the first piston top rod and the first sample plug;

[0027] A second counter-pressure channel is formed through the second sample plug, and the outlet of the second counter-pressure channel is arranged relative to the soil sample to be tested. The inlet of the second counter-pressure channel is formed in the side of the second sample plug.

[0028] A third counter-pressure channel is formed in the first base, and the outlet of the third counter-pressure channel is connected to the inlet of the second counter-pressure channel through a conveying pipe.

[0029] Beneficial effects: While performing axial pressing, the external confining liquid input device is started to inject confining liquid. The confining liquid enters the pressure chamber through the confining liquid inlet and fills the pressure chamber, thereby exerting extrusion force on the surrounding of the soil sample to be tested, simulating the extrusion effect of the surrounding soil body on the test soil body. Subsequently, the confining liquid is discharged from the upper confining liquid outlet to realize confining liquid circulation and ensure the stability of the pressure exerted on the soil sample to be tested. Moreover, confining liquid at a suitable temperature can be introduced to ensure the temperature stability of the soil sample to be tested.

[0030] In an alternative embodiment, the soil triaxial nuclear magnetic resonance combined measurement device further comprises a support rod, which penetrates the nuclear magnetic resonance tester and is fixed at both ends of the support rod on the first base and the second base.

[0031] Beneficial effects: The support rod is used to stabilize the nuclear magnetic resonance tester, the first base, the second base, and the pressure chamber during testing, thereby improving the overall structural stability of the gripper and avoiding pressure errors.

[0032] In an alternative embodiment, the pressure chamber, the first sample plug and the second sample plug are made of ceramic;

[0033] The support rod is made of titanium alloy.

[0034] Beneficial effects: the first sample plug and the second sample plug are made of ceramic, and are made of non-metallic materials without hydrogen atoms, so that the first sample plug and the second sample plug have no nuclear magnetic substrate signals, so as to avoid interfering with the nuclear magnetic resonance test results of the unsaturated soil sample, the ceramic has a temperature resistance of -40℃ to 100℃ and a pressure resistance of 5MPa, so that the test performance is improved and the data error is reduced. The sample cylinder is made of ceramic, so that the test performance is improved and the data error is reduced.

[0035] In an alternative embodiment, the base frame comprises:

[0036] A moving unit;

[0037] A lower pressing plate, the lower pressing plate is installed on the moving unit, and the pressing member is installed on the lower pressing plate;

[0038] A counterforce frame pull rod, the counterforce frame pull rod is vertically fixed on the lower pressing plate, and an outer surface of the nuclear magnetic test instrument is adapted to be fixed on the counterforce frame pull rod;

[0039] An upper pressing plate, the upper pressing plate is fixed at a top end of the counterforce frame pull rod, and the pressure sensor is adapted to be installed on the upper pressing plate.

[0040] Beneficial effects: by setting the counterforce frame pull rod, the lower pressing plate and the upper pressing plate, a support platform is provided for the soil triaxial nuclear magnetic combined measurement device, and the entire soil triaxial nuclear magnetic combined measurement device is changed into a movable equipment, so that the test area is changed conveniently. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0042] Figure 1 It is a whole structure schematic view of a soil triaxial nuclear magnetic combined measurement device of the embodiment of the present application;

[0043] Figure 2 It is a structure schematic view of a base frame of the embodiment of the present application;

[0044] Figure 3The utility model discloses an assembly schematic view of pressure chamber structure, pressurizing structure and nuclear magnetic testing instrument of the utility model embodiment.

[0045] Figure 4 The utility model discloses a sectional view schematic view of pressure chamber structure, pressurizing structure and nuclear magnetic testing instrument of the utility model embodiment.

[0046] Mark explanation:

[0047] 1, base frame, 11, mobile unit, 12, lower pressing plate, 13, counterforce frame pull rod, 14, upper pressing plate,

[0048] 2, pressure chamber structure, 21, sample cylinder, 22, first base, 221, confining pressure liquid inlet, 222, third counter pressure channel, 23, second base, 231, confining pressure liquid outlet, 24, framework, 25, pressure chamber,

[0049] 3, pressurizing structure, 31, pressurizing piece, 32, pressure sensor, 33, displacement sensor, 34, first piston top rod, 35, first sample plug, 36, second piston top rod, 37, second sample plug, 38, first counter pressure channel, 39, second counter pressure channel,

[0050] 4, nuclear magnetic testing instrument,

[0051] 5, support rod. DETAILED DESCRIPTION

[0052] In order to make the utility model embodiment's purpose, technical scheme and advantage more clear, below will combine the drawing in the utility model embodiment, to the technical scheme in the utility model embodiment clear, complete is described, obviously, the described embodiment is the part embodiment of the utility model, rather than all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor are within the scope of the utility model protection.

[0053] Soil mechanics is the basic discipline of civil engineering and geology, and studies the mechanical properties and engineering characteristics of soil. The research and application of soil mechanics are of great significance for ensuring engineering safety and reducing engineering cost. Soil has the characteristics of discontinuity, heterogeneity, anisotropy and nonlinearity, which makes the behavior of soil under different stress conditions very complex. In order to better understand and predict the behavior of soil, soil test such as unsaturated soil triaxial test is used, in which the pore structure characteristics, internal water distribution state and mechanical properties of the soil sample change when it is subjected to axial stress and surrounding pressure, but the traditional soil triaxial test cannot realize online monitoring of the internal changes and pore changes of soil at present.

[0054] In order to solve the above technical problems, the utility model discloses a soil triaxial nuclear magnetic combined measuring device.

[0055] The embodiments of the present application are described below in conjunction with Figures 1 to 4 The embodiments of the present application are described below in conjunction with

[0056] According to the embodiments of the present application, on the one hand, a soil triaxial nuclear magnetic joint measuring device is provided, which specifically comprises: a base frame 1, a pressure chamber structure 2, a pressurizing structure 3, and a nuclear magnetic tester 4.

[0057] As shown in Figure 1 and Figure 2 , the base frame 1 comprises: a moving unit 11, a lower pressing plate 12, a counterforce frame pull rod 13, and an upper pressing plate 14. The moving unit 11 is a moving trolley, and the moving unit 11 is horizontally fixed with a lower pressing plate 12. The lower pressing plate 12 is fixed on the side surface of the moving unit 11, and the lower pressing plate 12 is at a certain distance from the bottom surface of the moving unit 11 to facilitate the installation of the counterforce frame pull rod 13. The end of the lower pressing plate 12 away from the side surface of the moving unit 11 is fixed to the bottom surface of the moving unit 11 through two supports. The counterforce frame pull rod 13 is provided with four, and the lower ends of the four counterforce frame pull rods 13 are fixed on the lower pressing plate 12. The four counterforce frame pull rods 13 are vertically placed, and from the perspective of the top view, the four counterforce frame pull rods 13 are placed in a rectangular shape. The four counterforce frame pull rods 13 are of the same length, so that the top ends of the four counterforce frame pull rods 13 are on the same horizontal plane after installation. The upper pressing plate 14 is fixed to the upper ends of the four counterforce frame pull rods 13, and the four counterforce frame pull rods 13 are respectively fixed at the four corners of the upper pressing plate 14. The upper pressing plate 14 is horizontally installed. The counterforce frame pull rod 13 is made of titanium alloy material, which improves the axial pressure stability provided by the pressurizing structure 3 and avoids pressure errors. Four mounting supports are fixed on the counterforce frame pull rod 13, two mounting supports are arranged on each side, and the four horizontal sides of the nuclear magnetic tester 4 are respectively fixed.

[0058] The nuclear magnetic tester 4 is in the shape of a cuboid, and the four sides are respectively fixed on the four counterforce frame pull rods 13. The nuclear magnetic tester 4 is installed in the installation space formed between the four counterforce frame pull rods 13. The nuclear magnetic tester 4 is sleeved outside the pressure chamber structure 2.

[0059] As shown in Figure 4As shown, the pressure chamber structure 2 comprises a sample cylinder 21, a first base 22, a second base 23 and a skeleton 24; the skeleton 24 is in a cylinder type, the outer surface of the skeleton 24 is provided with a protrusion along the radial direction, and the inner wall of the nuclear magnetic tester 4 is provided with a clamping structure matched with the protrusion, and the nuclear magnetic tester 4 and the skeleton 24 are clamped with each other. The sample cylinder 21 is installed in the skeleton 24. The sample cylinder 21 is provided with a cavity along the axial direction, the first base 22 is installed at the bottom end of the sample cylinder 21, the second base 23 is installed at the top end of the sample cylinder 21, and the central axis of the first base 22, the central axis of the second base 23 and the central axis of the sample cylinder 21 coincide, so that the first base 22, the second base 23 and the sample cylinder 21 enclose a pressure chamber 25. In this embodiment, the two ends of the skeleton 24 abut against the first base 22 and the second base 23 respectively, and the inner diameter of the skeleton 24 is greater than the outer diameter of the sample cylinder 21, so that an annular gap is formed between the skeleton 24 and the sample cylinder 21, which can reduce the influence of external temperature on the pressure chamber 25, isolate the sample temperature and improve the data stability. According to the need, the annular gap can be filled with thermal insulation material. The test end of the nuclear magnetic tester 4 is opposite to the pressure chamber 25 to obtain the best test result. The sample cylinder 21 is made of ceramic material, which can improve the test performance and reduce the data error.

[0060] As Figure 1 , Figure 3 and Figure 4As shown, the pressurizing structure 3 includes: a pressurizing component 31, a pressure sensor 32, a first piston rod 34, a first sample plug 35, a second piston rod 36, a second sample plug 37, and a displacement sensor 33. The pressurizing component 31 is a hydraulic pump, fixed to the upper surface of the lower pressure plate 12 near the pressure chamber structure 2. The pressurizing end of the pressurizing component 31 faces the pressure chamber 25. The pressure sensor 32 is fixed to the lower surface of the upper pressure plate 14 near the pressure chamber structure 2. The pressurizing component 31 withstands a pressure of 5 MPa, improving its applicability to NMR. One end of the first piston rod 34 is fixed to the pressurizing end of the pressurizing component 31, and the other end extends through the first base 22 into the pressure chamber 25. The first sample plug 35 is installed at the end of the first piston rod 34 away from the pressurizing component 31. One end of the second piston rod 36 abuts against the pressure sensor 32, and the other end of the second piston rod 36 passes through the second base 23 and extends into the pressure chamber 25. A second sample plug 37 is installed at the end of the first piston rod 34 furthest from the pressure sensor 32. A displacement sensor 33 is installed on the first piston rod 34 to detect the movement distance of the first piston rod 34. The first sample plug 35 and the second sample plug 37 are made of ceramic, using a non-metallic material free of hydrogen atoms. The first sample plug 35 and the second sample plug 37 have no NMR substrate signal to avoid interfering with the NMR test results of the unsaturated soil sample. The ceramic is temperature resistant from -40℃ to 100℃ and pressure resistant to 5MPa, improving test performance and reducing data errors. The pressure sensor 32 is not directly connected to the pressure-applying component 31 and is located at the end of the pressure-applying structure 3, improving the stability and accuracy of the test.

[0061] In one embodiment, such as Figure 4 As shown, a confining pressure liquid inlet 221 is provided on the first base 22, and a confining pressure liquid outlet 231 is provided on the second base 23. One end of the confining pressure liquid inlet 221 communicates with the outside and is connected to the confining pressure liquid input device, while the other end of the confining pressure liquid inlet 221 is connected to the pressure chamber 25. One end of the confining pressure liquid outlet 231 communicates with the outside, while the other end of the confining pressure liquid outlet 231 is connected to the pressure chamber 25.

[0062] In one embodiment, such as Figure 4As shown, the first piston top rod 34 and the first sample plug 35 are provided with a first back pressure channel 38. The inlet of the first back pressure channel 38 is arranged on the lower end side of the first piston top rod 34, and the outlet of the first back pressure channel 38 is arranged on the top end of the first sample plug 35. The first back pressure channel 38 penetrates through the first piston top rod 34 and the first sample plug 35. The second sample plug 37 is provided with a second back pressure channel 39. The outlet of the second back pressure channel 39 is arranged relative to the soil sample to be detected, and the inlet of the second back pressure channel 39 is arranged on the side of the second sample plug 37. The first base 22 is provided with a third back pressure channel 222. The inlet of the third back pressure channel 222 is arranged on the side of the first piston top rod 34, and the outlet of the third back pressure channel 222 is connected to the inlet of the second back pressure channel 39 through a conveying pipe.

[0063] Through the above arrangement, the nuclear magnetic testing instrument 4, the first base 22, the second base 23 and the pressure chamber 25 are integrated, the sealing performance of the pressure chamber 25 is better, the real-time online detection is facilitated, and the influence of the pressure part on the nuclear magnetic detection is reduced. Moreover, the diameter of the pressure chamber structure 2 is reduced, so that it can be placed inside the nuclear magnetic testing instrument 4, which meets the nuclear magnetic test and the triaxial test.

[0064] When the soil triaxial test is needed, the soil sample to be detected is first placed in the pressure chamber 25, specifically between the first sample plug 35 and the second sample plug 37. The pressure part adopts a low-friction hydraulic oil cylinder action mode, pushes the first piston top rod 34 upward, and drives the first sample plug 35 to move upward to axially press the soil sample to be detected. The applied force is transmitted to the pressure sensor 32 through the soil sample to be detected, the second sample plug 37 and the second piston top rod 36. The pressure sensor 32 measures the axial stress, and the displacement sensor 33 measures the axial strain. The measured values are used as feedback to realize full-automatic servo control through a closed-loop control system, so as to realize stress path or strain path control experiment.

[0065] When the axial pressure is applied, the external confining pressure liquid input device is started to inject confining pressure liquid, the confining pressure liquid enters the pressure chamber 25 through the confining pressure liquid inlet 221 and fills the pressure chamber 25, the surrounding of the soil sample to be detected is applied with extrusion force, the extrusion effect of the surrounding soil body on the test soil body is simulated. Then, the confining pressure liquid is discharged from the upper confining pressure liquid outlet 231, the confining pressure liquid circulation is realized, and the stability of the pressure applied to the soil sample to be detected is ensured. Moreover, the confining pressure liquid with a suitable temperature can be injected to ensure the temperature stability of the soil sample to be detected. At the same time, the external water pump is started, water is injected from below the first counter-pressure channel 38 and discharged from the outlet above the first counter-pressure channel 38, and water is injected from the inlet of the third counter-pressure channel 222 and discharged through the outlet of the third counter-pressure channel 222, and then the water is injected from the inlet of the second counter-pressure channel 39 through the conveying pipe between the third counter-pressure channel 222 and the second counter-pressure channel 39 and discharged from the outlet of the second counter-pressure channel 39, so as to apply pore water pressure to the lower part and the upper part of the soil sample to be detected, respectively.

[0066] In the process of applying axial stress, radial stress and pore water pressure, the nuclear magnetic tester 4 is started, and the nuclear magnetic tester 4 detects the soil sample in the pressure chamber 25 in real time, so as to realize real-time and non-destructive online detection of the deformation, porosity, permeability, saturation and other sample physical property changes of the soil under different temperature and pressure conditions, and provide more-dimensional real-time online comparative experimental data for the study of the soil sample.

[0067] In an embodiment, the soil triaxial nuclear magnetic combined measurement device further comprises a support rod 5, the support rod 5 penetrates the nuclear magnetic tester 4, two ends of the support rod 5 are fixed on the first base 22 and the second base 23 respectively, the support rod 5 is used for stabilizing the nuclear magnetic tester 4, the first base 22, the second base 23 and the pressure chamber 25 in the test, the support rod 5 is made of titanium alloy material, the overall structural stability of the gripper is improved, and the pressure error is avoided. The titanium alloy is not magnetic, so that the adverse effects of the component material on the nuclear magnetic resonance instrument are reduced.

[0068] In an embodiment, at the connection between each component of the soil triaxial nuclear magnetic combined measurement device, for example, the connection between the first piston top rod 34 and the first base 22, a sealing ring and a plugging assembly are adopted, the sealing performance is better, and a good sealing state can be maintained in the long-term use or frequent freezing and thawing process.

[0069] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A soil triaxial nuclear magnetic resonance measurement device, characterized by, The utility model relates to a soil sample testing device, which comprises: a base frame (1); a pressure chamber structure (2) mounted on the base frame (1), the pressure chamber structure (2) being internally formed with a pressure chamber (25) for accommodating a soil sample to be detected; a pressurizing structure (3) mounted on the base frame (1), an output end of the pressurizing structure (3) being inserted into the pressure chamber (25) to apply axial pressure to the soil sample to be detected; a nuclear magnetic tester (4) externally sleeved on the pressure chamber structure (2), a detection end of the nuclear magnetic tester (4) being opposite to the pressure chamber (25).

2. The soil triaxial NMR correlative measurement device of claim 1, wherein, The pressure chamber structure (2) comprises a sample cylinder (21), a first base (22) and a second base (23), and a cavity is formed in the sample cylinder (21) along an axial direction; the first base (22) and the second base (23) are symmetrically arranged at two ends of the sample cylinder (21), and the first base (22), the second base (23) and the sample cylinder (21) enclose the cavity to form the pressure chamber (25).

3. The soil triaxial NMR correlative measurement device of claim 2, wherein, The pressure chamber structure (2) further comprises a skeleton (24) in the shape of a cylinder, the skeleton (24) being sleeved on the sample cylinder (21) and abutting against the first base (22) and the second base (23) at two ends thereof; wherein an inner diameter of the skeleton (24) is greater than an outer diameter of the sample cylinder (21) so that an annular gap is formed between the skeleton (24) and the sample cylinder (21), and the nuclear magnetic tester (4) and the skeleton (24) are mutually clamped.

4. The soil triaxial NMR correlative measurement device of claim 2, wherein, The pressurizing structure (3) comprises: a pressurizing member (31) fixed on the base frame (1) at a bottom end of the pressure chamber structure (2), a pressurizing end of the pressurizing member (31) being adapted to face the pressure chamber (25); a pressure sensor (32) fixed on the base frame (1) at a top end of the pressure chamber structure (2); a first piston rod (34) having one end mounted on the pressurizing end of the pressurizing member (31) and the other end penetrating through the first base (22) and extending into the pressure chamber (25), the first piston rod (34) being provided with a first sample plug (35) at an end away from the pressurizing member (31); a second piston rod (36) having one end connected to the pressure sensor (32) and the other end penetrating through the second base (23) and extending into the pressure chamber (25), the first piston rod (34) being provided with a second sample plug (37) at an end away from the pressure sensor (32); wherein the soil sample to be detected is adapted to be placed between the first sample plug (35) and the second sample plug (37).

5. The soil triaxial NMR correlative measurement device of claim 4, wherein, The pressurizing structure (3) further comprises a displacement sensor (33) mounted on the first piston rod (34).

6. The soil triaxial NMR correlative measurement device of claim 4, wherein, The first base (22) is provided with a surrounding pressure liquid inlet (221), and the second base (23) is provided with a surrounding pressure liquid outlet (231), wherein the surrounding pressure liquid inlet (221) and the surrounding pressure liquid outlet (231) are communicated with the pressure chamber (25).

7. The soil triaxial NMR correlative measurement device of claim 4, wherein, The first piston rod (34) and the first sample plug (35) are provided with a first back pressure channel (38) penetrating therethrough; The second sample plug (37) is provided with a second back pressure channel (39) penetrating therethrough, wherein the outlet of the second back pressure channel (39) is arranged relative to the soil sample to be detected, and the inlet of the second back pressure channel (39) is arranged on the side of the second sample plug (37); The first base (22) is provided with a third back pressure channel (222), and the outlet of the third back pressure channel (222) is connected with the inlet of the second back pressure channel (39) through a conveying pipe.

8. The soil triaxial NMR correlative measurement device of claim 4, wherein, The soil triaxial nuclear magnetic joint detection device further comprises a supporting rod (5) penetrating the nuclear magnetic tester (4), and both ends of the supporting rod (5) are fixed on the first base (22) and the second base (23), respectively.

9. The soil triaxial NMR correlative measurement device of claim 8, wherein, The pressure chamber (25), the first sample plug (35) and the second sample plug (37) are made of ceramic; The supporting rod (5) is made of titanium alloy.

10. The soil triaxial NMR correlative measurement device of claim 4, wherein, The base frame (1) comprises: a moving unit (11); a lower pressing plate (12) mounted on the moving unit (11), and the pressing member (31) is mounted on the lower pressing plate (12); a counterforce frame pull rod (13) vertically fixed on the lower pressing plate (12), and the outer surface of the nuclear magnetic tester (4) is adapted to be fixed on the counterforce frame pull rod (13); an upper pressing plate (14) fixed on the top end of the counterforce frame pull rod (13), and the pressure sensor (32) is adapted to be mounted on the upper pressing plate (14).

Images