Triaxial Nuclear Magnetic Microstructure Analyzer for Unsaturated Soil of Roadbed

The unsaturated soil triaxial nuclear magnetic microstructure analyzer is a core nuclear magnetic resonance analysis and imaging system launched by Neway Corporation, which integrates nuclear magnetic resonance relaxation analysis and imaging functions. The vertically enlarged cavity magnet has a wide range of applications, and the push-pull injection is designed specifically for vertical sample placement experimental scenarios. While achieving coupling of multiple fields such as temperature field, pressure field, chemical field, and seepage field, it is organically combined with traditional mechanical measurement methods such as soil triaxial testing for joint measurement.

Highway subgrades are often located inUnsaturated stateRainfall infiltration, groundwater rise, freeze-thaw cycles, and wet dry alternation can all alter the moisture distribution, pore structure, and matric suction of roadbed soil, leading to engineering diseases such as roadbed settlement, deformation, strength degradation, and slope instability. Traditional detection methods can only obtain macroscopic average moisture content, suction and strength data, and cannot in situ, non destructively, and dynamically reveal the micro mechanisms of water transport, pore evolution, and water force coupling inside the roadbed.

Triaxial Nuclear Magnetic Microstructure Analyzer for Unsaturated Soil of Roadbed，The organic combination of soil triaxial macroscopic mechanical characterization and low field nuclear magnetic resonance microscopic relaxation analysis to achieve in-situ online measurement is an innovative tool for mechanism research in geotechnical engineering.

1、 LowPrinciples of Field Nuclear Magnetic Resonance Technology

Low field nuclear magnetic resonance technologyThe core principle is to detect the relaxation behavior of hydrogen nuclei in soil pore water under an external magnetic field. When the soil sample is placed in a magnetic field and excited by radio frequency pulses, the hydrogen nuclei in water molecules undergo energy level transitions; After the pulse stops, the hydrogen nucleus releases energy and returns to equilibrium, a process calledrelaxationThere are significant differences in the relaxation time of water molecules in pores of different sizes and under different binding states. By analyzing the relaxation time spectrum, non-destructive and quantitative inversion can be achievedPore distribution, moisture content, and existing forms of soil.

By organically combining this technology with the soil triaxial testing system, a multi field coupled analysis capability of "stress temperature fluid" is formed, which can capture the dynamic changes of soil moisture state, pore distribution, and crack development during compression, freeze-thaw, and seepage processes in real time.

IICompared with traditional drying methods, tensiometer methods and other detection methods, low field nuclear magnetic resonance technologyThe advantages are as follows:

1) Non-destructive testingNo need to damage the sample structure, ensuring the original state of the soil, suitable for long-term and repeated monitoring of the same sample.

2) Spatial visualizationDirectly obtain the three-dimensional distribution of moisture inside the soil, clearly display the water front and migration path.

3) Accurate determination of SWCCTraditionally, the determination of soil water characteristic curve (SWCC) requires a complex equilibrium process. Low field nuclear magnetic resonance can directly and quickly determine the moisture content under different suction forces by controlling the NMR scan under matric suction, achieving efficient construction of SWCC.

4) Characterization of pore structureUsing T2 distribution to invert pore size distribution, evaluate pore connectivity, and reveal the micro evolution laws of soil barrier materials.

III Triaxial Nuclear Magnetic Microstructure Analyzer for Unsaturated Soil of RoadbedIntroduction

Unsaturated Soil Triaxial Nuclear Magnetic Microstructure AnalyzerIt is a core nuclear magnetic resonance analysis and imaging system launched by Neway Corporation, which integrates nuclear magnetic resonance relaxation analysis and imaging functions. The vertically enlarged cavity magnet has a wide range of applications, and the push-pull injection is designed specifically for vertical sample placement experimental scenarios. While achieving coupling of multiple fields such as temperature field, pressure field, chemical field, and seepage field, it is organically combined with traditional mechanical measurement methods such as soil triaxial testing for joint measurement.

Triaxial Nuclear Magnetic Microstructure Analyzer for Unsaturated Soil of RoadbedBasic parameters:

Product model: MacroMR12-150V-I

Magnetic field strength: 0.30T ± 0.03T

Magnet uniformity: ≤ 50ppm

Magnet shape: vertically placed

Injection method: longitudinal

Product characteristics of roadbed unsaturated soil deformation and stability analyzer：

1. Ultra wide magnetic cavity, easy injection without pressure:

Vertically placed magnet, specially developed for experimental scenarios considering gravity, suitable for core samples with diameters ranging from 25 to 100mm.

2. High precision constant probe for you, advanced gradient system:

The data collection is stable and reliable, achieving better imaging effects, as well as constant gradient layer detection during dynamic experimental processes.

3. Wide range of attachment extensions:

Multi specification core clamps and sample chambers are used to simulate various real environments (temperature, pressure, fluid, gas, etc.), especially coupled with soil triaxial clamps, to achieve the joint measurement of low field nuclear magnetic resonance and traditional mechanics.

Application of roadbed unsaturated soil deformation and stability analyzer product：

1. Moisture content:

Moisture content determination

Determination of moisture content at different levels

Research on Soil Freeze Thaw Mechanism

Determination of unfrozen water content

Penetration evaluation

Characterization of pore structure

2. Mechanism of water distribution and seepage:

Dynamic migration process of water

Types and distribution characteristics of pore water

Soil water freeze-thaw phase transition and distribution characterization

Evaluation of Soft Soil Solidification, Solid Waste, and Grouting Improvement

Temperature/pressure/fluid multi field coupling experiment

Analysis of Infiltration and Absorption Process and Characteristics

Research on the Formation and Decomposition Mechanism of Frozen Soil Hydrates

3. Earth three-axis:

Porosity and pore size distribution detection

Static/dynamic triaxial compression analysis

Evaluation of freeze-thaw compression damage

Analysis of Consolidation Drainage Shear Experiment

Experimental evaluation of thermal solidification of saturated clay

Analysis of three-axis custom waveform compression

Research on the Mechanism of Soil Vibration, Liquefaction, and Water Transport

Evaluation of three-axis melting, settling and compression coefficient of frozen soil

Application Case: Characterization of Pore Water Distribution in Unsaturated Soil Drying Process Based on NMR

After sales service: in-depth experience, precise selection

Neway has a professional customer experience center, welcoming customers to visit the site, have zero distance contact and operate the equipment, and intuitively feel its performance and usability. Through on-site experience and professional explanations from senior consultants, we help customers accurately evaluate whether the equipment meets their application needs.

After sales support: fast response, professional guarantee

Quick response mechanism: We promise to respond within 4 hours and provide a solution within 8 hours. If remote solutions are not possible, engineers will arrive within 24 hours in provincial capitals and 72 hours in remote areas, including holidays. Ensure that users receive timely and effective handling when encountering problems, minimizing the impact of equipment downtime.

Professional team configuration: We have a highly educated service team of nearly 20 people, with master's degrees accounting for over 60%. We have a strong technical foundation and customized service capabilities to ensure that complex problems are solved professionally and efficiently.

Multiple communication channels: support telephone QQ、 WeChat and other various methods provide convenient and flexible communication, and can respond to customer needs at any time.

User training empowerment: Neway has established a normalized training system. In addition to holding regular application training courses, it also provides flexible online and offline daily training. Users can obtain software and hardware training videos anytime and anywhere through "Newmart Analysis", "Newmart Service" WeChat official account and "Nuclear Magnetic Research Energy Station" applet, so as to continuously improve operating skills and application level and maximize the value of equipment.

Proactive service culture: Adhering to the concept of "achieving customer success and taking responsibility", engineers actively follow up, proactively solve problems, help customers reduce unnecessary repair processes, and save time and energy. And continuously optimize service processes based on customer feedback, growing together with customers.

Device QR code identification: Each device is equipped with a QR code identification, and customers can quickly obtain online support entry by scanning the code, greatly improving service response efficiency and convenience.

Full dimensional service centers cover the whole country: Neway has 7 full dimensional service centers located in Shanghai, Suzhou, Chengdu, Guangzhou, Zhengzhou, Beijing, and Taiyuan, covering all regions of China, ensuring that service resources can quickly reach customers across the country.