Dynamic behaviors of water-saturated and frozen sandstone subjected to freeze-thaw cycles

Gao, Feng; Liu, Cong; Xiong, Xin; Zhang, Yanan; Zhou, Keping

doi:10.1016/j.jrmge.2022.11.007

Cited by 21 publications

(9 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As can be seen from the Figure 13, the two show a pattern of exponential function growth, and R 2 equals 0.970. This is in high agreement with the model [36] and η equals 39.15 and ρ equals −1/24.17. Therefore, the use of porosity to evaluate freeze-thaw cycling damage in sandstone is feasible and applicable to other rocks.…”

Section: Nuclear Magnetic Resonancesupporting

confidence: 87%

“…In order to investigate the relationship between the peak intensity correlation coefficient and the freeze-thaw damage factor, the model studied by Gao, F et al [36] was fitted.…”

Section: Nuclear Magnetic Resonancementioning

confidence: 99%

“…The principal structure relationship under coupled freeze-thaw-fatigue loading is obtained by combining Equation (36) and Equation (37).…”

Section: Damage Model Under the Coupled Freeze-thaw-fatigue Loading O...mentioning

confidence: 99%

See 2 more Smart Citations

Experimental Study on the Microfabrication and Mechanical Properties of Freeze–Thaw Fractured Sandstone under Cyclic Loading and Unloading Effects

Liu,

Cai,

Sheng

et al. 2024

Materials

View full text Add to dashboard Cite

A series of freeze–thaw cycling tests, as well as cyclic loading and unloading tests, have been conducted on nodular sandstones to investigate the effect of fatigue loading and freeze–thaw cycling on the damage evolution of fractured sandstones based on damage mechanics theory, the microstructure and sandstone pore fractal theory. The results show that the number of freeze–thaw cycles, the cyclic loading level, the pore distribution and the complex program are important factors affecting the damage evolution of rocks. As the number of freeze–thaw cycles rises, the peak strength, modulus of elasticity, modulus of deformation and damping ratio of the sandstone all declined. Additionally, the modulus of elasticity and deformation increase nonlinearly as the cyclic load level rises. With the rate of increase decreasing, while the dissipation energy due to hysteresis increases gradually and at an increasing rate, and the damping ratio as a whole shows a gradual decrease, with a tendency to increase at a later stage. The NRM (Nuclear Magnetic Resonance) demonstrated that the total porosity and micro-pores of the sandstone increased linearly with the number of freeze–thaw cycles and that the micro-porosity was more sensitive to freeze–thaw, gradually shifting towards meso-pores and macro-pores; simultaneously, the SEM (Scanning Electron Microscope) indicated that the more freeze–thaw cycles there are, the more micro-fractures and holes grow and penetrate each other and the more loose the structure is, with an overall nest-like appearance. To explore the mechanical behavior and mechanism of cracked rock in high-altitude and alpine areas, a damage model under the coupling of freeze–thaw-fatigue loading was established based on the loading and unloading response ratio theory and strain equivalence principle.

show abstract

Section: Nuclear Magnetic Resonancesupporting

confidence: 87%

“…In order to investigate the relationship between the peak intensity correlation coefficient and the freeze-thaw damage factor, the model studied by Gao, F et al [36] was fitted.…”

Section: Nuclear Magnetic Resonancementioning

confidence: 99%

See 1 more Smart Citation

Experimental Study on the Microfabrication and Mechanical Properties of Freeze–Thaw Fractured Sandstone under Cyclic Loading and Unloading Effects

Liu,

Cai,

Sheng

et al. 2024

Materials

View full text Add to dashboard Cite

show abstract

“…The mesoscopic pore structure of porous materials has a significant influence on the macroscopic mechanical properties [27,28]. To investigate the inherent relationship between the microporosity of soil-rock mixtures and their uniaxial compressive strength, the characteristic angular similarity and uniaxial strength were fitted and calculated.…”

Section: Effect Of Freeze-thaw Cycles On Mechanical Properties Of Soi...mentioning

confidence: 99%

Experimental Study on Macroscopic Mechanical Characteristics and Microscopic Pore Structure Evolution of Soil–Rock Mixture under Repeated Freeze–Thaw Cycles

Deng,

Zhao,

Xiao

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

The response characteristics of the mesostructure and macro-characteristics of the soil–rock mixture under repeated freeze–thaw action have an important influence on the safety and stability of the dump slope in low-temperature environments. In order to further understand the multi-scale response behavior of a soil–rock mixture under freeze–thaw cycles, this paper carried out indoor freeze–thaw cycles, uniaxial compression, and electrochemical impedance spectroscopy tests on a soil–rock mixture taken from a graphite mine dump in Jixi City, Heilongjiang Province, China. Combined with the simulation calculation of discrete element numerical software (PFC2D 7.0), the effects of freeze–thaw cycling on electrochemical impedance spectrometry (EIS) mesoscopic parameters, uniaxial compressive strength, and crack propagation of soil–rock mixtures were analyzed. The intrinsic relationship between mesoparameters and macroscopic mechanical properties was established. The results showed that as the number of freeze–thaw cycles increases from 0 to 15, the mesopores inside the soil–rock mixture gradually increase, and the angular similarity of distribution characteristics increases by 5.25%. The uniaxial compressive strength and the peak secant modulus increase exponentially with the increase in the number of freeze–thaw cycles, the uniaxial compressive strength decreases by 47.62%, and the peak secant modulus decreases by 75.87%. The peak strain and pore compaction stage showed an exponential increase and an increasing trend, respectively, and the peak strain increased from 2.115% to 4.608%. The failure mode was basically similar in different cycles; the failure cracks extended from the corners to the middle and lower parts before the failure finally occurred. The types of failure cracks were mainly tensile cracks, followed by tensile shear cracks and the fewest compression shear cracks. The similarity and uniaxial compressive strength conformed to a good linear relationship with the number of freeze–thaw cycles, with the uniaxial compressive strength decreasing linearly with the increase in similarity.

show abstract

“…These investigation results indicated that after undergoing the F&T weathering process, the elastic modulus [7][8][9][10][11], uniaxial compressive strength (UCS) [7,8,[10][11][12][13][14], Brazilian tensile strength (BTS) [15][16][17][18], point load strength (PLS) [15,16], dynamic uniaxial compressive strength (UCS d ) [7,8,10,[19][20][21][22] and dynamic tensile strength (BTS d ) [19,23] of rocks such as sandstone, tuff, gneiss, granite and shale all decreased as the quantity of F&T weathering cycles increased, but to different extents. To reveal the change laws in these mechanical parameters with the quantity of F&T weathering cycles, a sequence of regression analysis models [24,25] and exponential decay models [15,16,[26][27][28] were proposed based on the relationships between these mechanical parameters and the quantity of F&T weathering cycles. In addition, Liu et al [29] regarded F&T weathering cycles as a kind of fatigue damage and thus established a fatigue damage model of rocks after undergoing F&T weathering cycles.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Strength Evolution Model of Sandstone Subjected to Freeze–Thaw Weathering Process: Considering the Confining Pressure Effect

et al. 2022

View full text Add to dashboard Cite

Freeze-and-thaw (F&T) weathering cycles induced by day–night and seasonal temperature changes cause a large number of rock mass engineering disasters in cold areas. Investigating the impact of F&T weathering process on the strength and deformation characteristics of frozen–thawed rocks is therefore of critical scientific importance for evaluating the stability and optimizing the design of rock mass engineering in these areas. In this research, the evolution characteristics of F&T damage were analyzed based on T2 spectrum distribution curves of sandstone specimens before and after F&T weathering cycles. The coupling impact of the quantity of F&T weathering cycles and confining pressure on pre-peak and post-peak deformation behaviors of sandstone specimens were analyzed in detail. By introducing the confining pressure increase factor (CPIF), the impact of confining pressure on the triaxial compressive strength (TCS) of sandstone specimens after undergoing different quantities of F&T weathering cycles was further investigated. A novel strength evolution model was proposed that could effectively describe the coupling impact of the quantity of F&T weathering cycles and confining pressure on TCS of rocks after undergoing the F&T weathering process. The proposed strength evolution model was cross-verified with experimental data from the published literature and all correlation coefficients were above 0.95, which proved that the strength evolution model proposed in this paper was reasonable; in addition, this model has strong applicability.

show abstract

Dynamic behaviors of water-saturated and frozen sandstone subjected to freeze-thaw cycles

Cited by 21 publications

References 38 publications

Experimental Study on the Microfabrication and Mechanical Properties of Freeze–Thaw Fractured Sandstone under Cyclic Loading and Unloading Effects

Experimental Study on the Microfabrication and Mechanical Properties of Freeze–Thaw Fractured Sandstone under Cyclic Loading and Unloading Effects

Experimental Study on Macroscopic Mechanical Characteristics and Microscopic Pore Structure Evolution of Soil–Rock Mixture under Repeated Freeze–Thaw Cycles

Mechanical Properties and Strength Evolution Model of Sandstone Subjected to Freeze–Thaw Weathering Process: Considering the Confining Pressure Effect

Contact Info

Product

Resources

About