An experimental study on characteristics of impact compression of freeze–thawed granite samples under four different states considering moisture content and temperature difference

Ke, Bo; Zhang, Chunyang; Liu, Chuanju; Ding, Linmin; Zheng, Yun; Li, Ning; Wang, Yixian; Lin, Hang

doi:10.1007/s12665-021-09952-5

Cited by 19 publications

(6 citation statements)

References 79 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some scholars have conducted impact compression experiments on granite specimens with different water contents and degrees of freezing using separated Hopkinson rods. The effect of water on the dynamic modulus of elasticity was more significant than the effect of freeze-thaw temperature [22]. Some scholars also investigated the shear strength of specimens with different water contents after freezing and thawing using fine-grained sand from the drainage field and found that the samples' shear strength decreased the most after a single freeze-thaw action, and the specimens' cohesion and internal friction angles decreased according to water content with the increasing numbers of freeze-thaw cycles.…”

Section: Introductionmentioning

confidence: 90%

Numerical Study on Mechanical Properties of the Freezing–Thawing Cycle of Tailings Based on Particle Discrete Element Method

Huang

Yang

et al. 2022

Minerals

View full text Add to dashboard Cite

To study the effects of the number of freezing–thawing cycles (F-T cycles), the dry density, and the average particle diameter on the mechanical properties of tailings, the calibration laws of the fine-scale parameters in the discrete particle element numerical simulation software PFC2D(Particle Flow Code) were first tested, and then pre-experiments were conducted in the form of orthogonal tests. Finally, according to the results of the pre-experiments and the analysis of the pre-experimental results by SPSS (Statistical Product Service Solutions) software, uniaxial tests were carried out for different numbers of freeze–thaw cycles, different dry densities, and different average particle sizes. The tailings specimens were subjected to uniaxial compression simulations. The results showed that (1) the uniaxial compressive strength of the tailings specimens decreased with each freeze–thaw cycle, and stabilized after seven freeze–thaw cycles. (2) With a greater number of freeze–thaw actions, the porosity of the tailings increased after freeze–thawing. The peak of porosity was much higher than that of the models with fewer than seven freeze–thaw actions. (3) The contact number of tailings specimens showed a significant decrease after the number of freeze–thaw cycles reached seven. However, the amount of exposure was not the main factor affecting the strength of tailings (4). As the number of freeze–thaws increased, the tailings model was more prone to stress concentration. Previously, PFC software has been applied to tailings simulation studies, and this study verifies the feasibility of this method. This research is able to offer a reference for studying the mechanical property changes of tailings in the cold highland area.

show abstract

Section: Introductionmentioning

confidence: 90%

Numerical Study on Mechanical Properties of the Freezing–Thawing Cycle of Tailings Based on Particle Discrete Element Method

Huang

Yang

et al. 2022

Minerals

View full text Add to dashboard Cite

show abstract

“…Weakly consolidated rocks, such as mudstone, claystone, and expansive softrock, in water-rich regions, are susceptible to structural degradation due to F-T cycles in seasonally frozen environments. Extensive experimental studies, which include unconfined compressive tests [13], triaxial shear tests [14], Brazilian tensile tests [15], point loading tests [16], and split Hopkinson pressure bar tests [17] on weakly consolidated rocks, have consistently demonstrated a noteworthy decline in its mechanical properties with an increasing number of F-T cycles. Hong et al (2021) proposed a predictive model for uniaxial compressive strength of expansive soft rock that integrates F-T cycles, based on the elastic-plastic theory, and fatigue damage mechanics [18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Freeze–Thaw Cycles on Microstructure and Hydraulic Characteristics of Claystone: A Case Study of Slope Stability from Open-Pit Mines in Wet Regions

Liu,

Xiang,

Liu

et al. 2024

Water

View full text Add to dashboard Cite

The action of freeze–thaw (F–T) cycles of claystone exerts a profound impact on the slope stability of open-pit mines in water-rich regions. Microstructural changes are observed as a crucial factor in determining the hydraulic characteristics and mechanical behaviors of claystone. The present work integrates a micro-X-ray computed tomography (Micro-CT) scanner, equipped with image processing and three-dimensional (3D) reconstruction capabilities, employed to observe the microstructure of claystone under varying numbers of F–T cycles (0, 10, 20, 30, and 50). Furthermore, seepage numerical simulations based on Micro-CT measurements are conducted to evaluate the hydraulic characteristics. Through meticulous microscopic observation and mechanical analysis, the damage mechanism induced by F–T cycles is revealed and the evolutionary characteristics are analyzed. The two-dimensional (2D) images of 3D reconstructed models unveil the gradual initiation propagation and coalescence of an intricate fissuring network in claystone during the F–T cycles. As the number of F–T cycles increases from 0 to 50, the 3D porosity exhibits exponential growth. Additionally, the influence of F–T cycles substantially enhances the connectivity of fissures. The seepage numerical simulations demonstrate that the evolutionary progression of fissures substantially augments the number of flow paths and enhances permeability. The increase in permeability follows an exponential trend, reflecting the distribution and evolution of fissures under F–T cycles. The impact on permeability arises from a combination of micromechanical properties and the microstructure of claystones. The present research tries to elucidate the microscopic evolution of fissures and their corresponding hydraulic properties in water-saturated claystone, offering significant insights for investigating the slope stability of open-pit mines in regions.

show abstract

“…Rock is a material ubiquitous in mines, expressways, tunnels, dams, slopes, and other rock mass engineering [ 1 , 2 , 3 ], as shown in Figure 1 . The construction and operation of engineering are closely related to the physical and mechanical properties of rocks [ 4 , 5 , 6 ], whereas rock is essentially a kind of heterogeneous medium, which is a complex mineral aggregate formed under physical and chemical actions after a long geological process [ 7 , 8 ]. It is mainly composed of a variety of mineral grains and cements and contains a large number of defects, such as joints, micro-cracks, pores, holes, and faults [ 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Fracture Closure Empirical Model and Theoretical Damage Model of Rock under Compression

et al. 2023

Self Cite

View full text Add to dashboard Cite

The rock or rock mass in engineering often contains joints, fractures, voids, and other defects, which are the root cause of local or overall failure. In response to most of the current constitutive models that fail to simulate the nonlinear fracture compaction deformation in the whole process of rock failure, especially brittle rocks, a piecewise constitutive model was proposed to represent the global constitutive relation of rocks in this study, which was composed of the fracture compaction empirical model and the damage statistical constitutive model. The fracture empirical compaction model was determined by fitting the expressions of fracture closure curves of various rocks, while the rock damage evolution equation was derived underpinned by the fracture growth. According to the effective stress concept and strain equivalence hypothesis, the rock damage constitutive model was deduced. The model parameters of the fracture compaction empirical model and damage statistical constitutive model were all calculated by the geometrical characteristics of the global axial stress–strain curve to guarantee that the models are continuous and smooth at the curve intersection, which is also simple and ready to program. Finally, the uniaxial compression test data and the triaxial compression test data of different rocks in previous studies were employed to validate the models, and the determination coefficient was used to measure the accuracy. The results showed great consistency between the model curves and test data, especially in the pre-peak stage.

show abstract

An experimental study on characteristics of impact compression of freeze–thawed granite samples under four different states considering moisture content and temperature difference

Cited by 19 publications

References 79 publications

Numerical Study on Mechanical Properties of the Freezing–Thawing Cycle of Tailings Based on Particle Discrete Element Method

Numerical Study on Mechanical Properties of the Freezing–Thawing Cycle of Tailings Based on Particle Discrete Element Method

Effect of Freeze–Thaw Cycles on Microstructure and Hydraulic Characteristics of Claystone: A Case Study of Slope Stability from Open-Pit Mines in Wet Regions

Fracture Closure Empirical Model and Theoretical Damage Model of Rock under Compression

Contact Info

Product

Resources

About