Experimental study on effects of freeze‐thaw fatigue damage on the cracking behaviors of sandstone containing two unparallel fissures

Zhou, Xiaoping; Niu, Yong; Zhang, Jian‐Zhi; Shen, Xiangfei; Zheng, Yu; Berto, Filippo

doi:10.1111/ffe.12987

Cited by 61 publications

(25 citation statements)

References 32 publications

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“…At present, some researchers have obtained some results and practical experiences in the research of rock freeze-thaw damage mechanism and freeze-thaw test [4][5][6]. Also, an increasing number of researchers have focused on the study of rock stress relaxation model.…”

Section: Introductionmentioning

confidence: 99%

Fractional Stress Relaxation Model of Rock Freeze‐Thaw Damage

Liu

Chen

Guo

et al. 2021

Advances in Materials Science and Engineering

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Freeze-thaw cycle is a type of fatigue loading, and rock stress relaxation under freeze-thaw cycles takes into account the influence of the freeze-thaw cycle damage and deterioration. Rock stress relaxation under freeze-thaw cycles is one of the paramount issues in tunnel and slope stability research. To accurately describe the mechanical behaviour of stress relaxation of rocks under freeze-thaw, the software element is constructed based on the theory of fractional calculus to replace the ideal viscous element in the traditional element model. The freeze-thaw damage degradation of viscosity coefficient is considered. A new three-element model is established to better reflect the nonlinear stress relaxation behavior of rocks under freeze-thaw. The freeze-thaw and stress relaxation of rock are simulated by ABAQUS, the relevant model parameters are determined, and the stress relaxation equation of rock under freeze-thaw cycle is obtained based on numerical simulation results. The research shows that the test results are consistent with the calculated results, indicating that the constitutive equation can better describe the stress relaxation characteristics of rocks under freeze-thaw and provide theoretical basis for surrounding rock support in cold region.

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Section: Introductionmentioning

confidence: 99%

Fractional Stress Relaxation Model of Rock Freeze‐Thaw Damage

Liu

Chen

Guo

et al. 2021

Advances in Materials Science and Engineering

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“…Lu et al [21] conducted triaxial compression test on sandstone containing single flaw subjected to F-T treatment, and they considered the influences of confining pressure, F-T action, and loading on the deterioration of rock mechanical properties. Zhou et al [22] studied the effect of F-T cycles in the cracking behavior of sandstone containing two unparallel preflaws under uniaxial compression, and the cracking process was recorded by high-speed digital video camera, and their investigations proved that the F-T damage characteristic of fractured rock is totally from the intact rock. For the F-T mechanical behaviors of fractured rock, most of them are applied to conventional uniaxial or triaxial stress paths.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Investigation on the Effects of Natural Fracture on Fracture Evolution of Granite Exposed to Freeze-Thaw-Cyclic (FTC) Loads

Wang

Gao

et al. 2021

Geofluids

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The natural fractures in rock mass are susceptible to damage evolution when subjecting to repeated freeze-thaw (F-T) weathering in cold regions, which can lead to the instability of rock engineering and even occurrence of geological hazards. Knowledge of how natural fracture impacts the overall fracture evolution of freeze-thawed rock is important to predict the stability of rock structure. In this work, we reported uniaxial experimental measurements of the changes in strength, deformation, acoustic emission (AE) pattern, and Felicity effect during increasing amplitude stress-cycling conditions on granite. The results show that the change of fracture aperture is related to the fracture openness and filling characteristics, open-type fracture is sensitive to F-T treatment, and its aperture increases faster than the close-type and fill-type fracture. In addition, strength decreases, and the damping characteristics first decrease and then increase with increasing natural fracture volume. AE activities also present different responses during sample deformation. The proportion of AE signals having low-frequency characteristics increases with increasing natural fracture volume, and the shear sliding along natural fracture results in the surge of AE activities. Moreover, the Felicity effect indicates that the Felicity ratio presents a fluctuation decreasing trend, and the preexisting fractures alter the stress memory characteristics of rock. It is suggested that the changes of the geomechanical and AE pattern are the interactions between the natural fracture and the newly stimulated fracture. The testing results are expected to improve the understanding of the influence of natural fractures on rock fracture evolution and can be helpful to predict the stability of rock structures and rock mass in cold regions.

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“…At present, the study of rock mechanics in cold regions has gradually become one of the hot topics, and the application of new technologies and means promotes its development, such as Nuclear Magnetic Resonance (NMR) technology (Ding et al 2020;Zhou et al 2015;Liu et al 2021;Jia et al 2020;Liu et al 2020a;Pan et al 2020;Zhang et al 2020d;Liu et al 2020b;), Ultrasonic Detections (Ding et al 2020;Wang et al 2017;Çelik, 2020;Wang et al 2019;Ivankina et al 2020), Digital Image Correlation (DIC) (Mardoukhi et al 2021), Neutron Diffraction Measurements (Ivankina et al 2020), Scanning Electron Microscope (SEM) (Wang et al 2017;Çelik, 2020;Wang et al 2019;Chang et al 2020;Abdolghanizadeh et al 2020;Fang et al 2018;Zhou et al 2018;Yang et al 2021b;Zhou et al 2019;Zhao et al 2019), Computed Tomography (CT) technique (Wang et al 2020b), Optical Microscope (Çelik, 2020;Mousavi et al 2020), X-ray Computed Micro-tomography (Deprez et al 2020b), X-ray diffraction (XRD) (Zhao et al 2019;Mousavi et al 2020), Acoustic Emission (Wang et al 2020b;Xiao et al 2020), Infrared thermography (Yang et al 2021a). These new techniques and their combined applications help to discover new features in experiments and provide verification means for the development of theory or numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on Characteristics of Impact Compression of Freeze-Thawed Granite Samples Under Four Different States Considering Moisture Content and Temperature Difference

Zhang

Liu

et al. 2021

Preprint

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The mechanics of rock masses in cold regions have attracted the attention of researchers from all over the world, and the concern here is that the mechanical properties of rock masses are inevitably weakened under freeze-thaw cycles. In this paper, firstly, granite samples were subjected to different freeze-thaw cycles, after that, we dealt with the freeze-thawed samples considering four different states, such as saturated and frozen states, saturated and normal temperature states, dry and frozen states as well as dry and normal temperature states. The impact compression test was carried out by using the Split Hopkinson Pressure Bar (SHPB) device. Results show that the impact strength of granite samples deteriorates with the increase of freeze-thaw cycles in the same state, for samples in different states, although the number of freeze-thaw cycles is equal, the degree of deterioration of the impact strength is different. For freeze-thawed granite samples in the same state, the dynamic elastic modulus decreases with the increase of freeze-thaw cycles, and its degree of decrease is different for different states. Under the same freeze-thaw cycles, the deterioration of mechanical properties of granite samples is different in four different weather states, for example, the dynamic elastic modulus from large to small is generally as follows: saturated and frozen states, saturated and normal temperature states, dry and frozen states as well as dry and normal temperature states. Finally, the freeze-thaw influence factor is proposed to describe the damage of granite samples. All in all, it can be concluded that water and low temperature strengthen the influence of freeze-thaw cycles on the dynamic mechanical properties of granite samples.

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Experimental study on effects of freeze‐thaw fatigue damage on the cracking behaviors of sandstone containing two unparallel fissures

Cited by 61 publications

References 32 publications

Fractional Stress Relaxation Model of Rock Freeze‐Thaw Damage

Fractional Stress Relaxation Model of Rock Freeze‐Thaw Damage

Laboratory Investigation on the Effects of Natural Fracture on Fracture Evolution of Granite Exposed to Freeze-Thaw-Cyclic (FTC) Loads

An Experimental Study on Characteristics of Impact Compression of Freeze-Thawed Granite Samples Under Four Different States Considering Moisture Content and Temperature Difference

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