Research background：

In cold regions, the alternating effects of freeze-thaw changes can easily trigger a series of disasters such as rock choking, landslides, ice cones, etc., causing damage to the construction and ecosystem of cold regions. Freezing and thawing "refers to a physical geological process and phenomenon in which rocks and soil layers freeze and melt due to temperature dropping below zero degrees and rising above zero degrees.Permafrost unfrozen water content analyzer, rock freeze-thaw pore water analyzer, nuclear magnetic resonance analyzer

In cold regions, the repeated freezing and thawing of ice and snow can cause rock fragmentation, leading to a decrease in the overall integrity of the rock mass and becoming one of the main factors that trigger slope collapse or sliding. Most rock slopes in cold regions are formed by blasting and slope cutting, resulting in extremely developed cracks in the rock of the slope, and the original structure is destroyed and disturbed. During the snow melting period, due to the large temperature difference between day and night, the ice and snow covering the surface of the rock gradually melt and infiltrate into the cracks of the rock under the conditions of sunlight during the day. When the temperature drops below 0'C at night, the water forks in the cracks will freeze again, and the day and night change, with alternating freezing and thawing. Due to the freezing of water into ice, its volume increases by about 9%. And volume expansion can generate stress of up to 200 MPa, therefore, under the action of frost heave force, the joints and fissures of the rock will further develop and extend deeper.

The repeated occurrence of freeze-thaw cycles leads to the continuous development of cracks, a decrease in the overall strength of the rock mass, and an increase in the area of cracks on the potential sliding surface, thereby causing collapse or landslide. In addition, the decrease in frost resistance of rock mass under the action of water is also one of the reasons for the overall and anti sliding strength of slopes, leading to collapse or overall and local sliding. The property in which the strength and stability of rocks change after being subjected to water is called rock softening. The softening of rocks is mainly determined by their mineral composition, structure, and structural characteristics.

Recommended instruments:Permafrost unfrozen water content analyzer, rock freeze-thaw pore water analyzer, nuclear magnetic resonance analyzer

Basic parameters

1. Magnet type: permanent magnet
2. Magnetic field strength: 0.52 ± 0.05T
3. Probe diameter: 60mm
4. Effective sample detection range: Ø 60mm sphere

Application scope

1. The influence of primary fractures on the degree of rock freeze-thaw damage
2. Freeze-thaw temperature seepage stress damage constitutive model
3. The interrelationship between porosity, saturated moisture content, permeability, capillary water absorption, etc
4. Physical properties of marble under cyclic freeze-thaw conditions
5. Study on the influencing factors of damage deterioration under rock freeze-thaw conditions
6. Research on the mechanism of rock frostbite

Application example: Research on freeze-thaw of granite

​​Note: If there are any changes in the appearance of the instrument, the data formula shall prevail