Damage Characteristics of Altered and Unaltered Diabases Subjected to Extremely Cold Freeze–Thaw Cycles

Luo, Xuedong; Jiang, Nan; Zuo, Changqun; Dai, Zhenwei; Yan, S.

doi:10.1007/s00603-013-0516-2

Cited by 69 publications

(19 citation statements)

References 8 publications

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“…The mechanical properties of soils after freeze-thaw cycling are directly related to the engineering performance of geotechnical structures such as the bearing capacity of foundations and the sliding resistance force in artificial and natural slopes [4,5,6]. Therefore, freeze-thaw stability is crucial for aeolian sand engineering, and the mechanical properties of this particular material can be improved by the hydration reaction of cement; this can be called cement improved aeolian sand (CIAS) and can indirectly be used as the filling material of foundations, thereby solving some engineering problems, such as mud boiling and pavement cracking [7,8]. CIAS is an environmentally friendly road base construction material that meets the stringent requirements of engineering stability in seasonal frozen areas and promotes environmentally friendly construction practices.…”

Section: Introductionmentioning

confidence: 99%

Effect of Freeze-Thaw Cycles on Triaxial Strength Property Damage to Cement Improved Aeolian Sand (CIAS)

Wang

et al. 2019

Materials

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Natural aeolian sand has the characteristics of low cohesion and poor water stability. In order to improve its crack resistance properties in the process of freeze-thaw cycles, P.O 42.5 ordinary Portland cement was added to form a mixture called cement improved aeolian sand (CIAS). SEM was used to analyze the microscopic micro-structure of CIAS at different times (7 days and 28 days). The mechanical properties of CIAS samples affected by freeze-thaw cycles were tested in a triaxial instrument, and gray-scale images of the three-phase distribution in the CIAS after freeze-thaw cycling were obtained by computed tomography (CT) scanning technology. The pore characteristic parameters (pore area, fractal dimension, and crack length) were studied by digital image process technique. Based on classical Griffith fracture theory, the development of the crack length and crack width with increasing freeze-thaw cycles is determined. Assuming that the pore area subordinates to the Weibull distribution, the parameters of the Weibull distribution, the damage evolution defined by the elastic modulus attenuation, and the pore area development of CIAS were determined. Research shows the cohesion decreases and internal friction angle increases with increasing cycle numbers. Three development patterns are observed: crack growth, crack closure, and crack merging, and the three patterns interact during freeze-thaw cycling. Furthermore, the fractal dimension of the pore edge fluctuates with the increasing number of freeze-thaw cycles. This work provides a theoretical basis for the application of aeolian sand and develops a method for disaster prevention in applications of freeze-thaw cycling.

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Section: Introductionmentioning

confidence: 99%

Effect of Freeze-Thaw Cycles on Triaxial Strength Property Damage to Cement Improved Aeolian Sand (CIAS)

Wang

et al. 2019

Materials

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“…. In this paper, a comparative analysis is conducted on the sandstone that has undergone 0, 20, 40, 80, and 120 freeze-thaw cycles [19,20], through which the typical physical and mechanical parameters of the sandstone specimens under the freeze-thaw cycle were obtained ( Table 1).…”

Section: Analysis Of Test Resultsmentioning

confidence: 99%

Study on Long-Term Dynamic Mechanical Properties and Degradation Law of Sandstone under Freeze-Thaw Cycle

Huang

Zeng

et al. 2020

Shock and Vibration

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This study is based on the tunnel-face slope engineering of Dongfeng tunnel in Shanxi section of China’s Shuozhou-Huanghua Railway. The sandstone specimens in the perennial freeze-thaw zone of the slope were collected to carry out freeze-thaw cycle static physical mechanics test and split Hopkinson pressure bar (SHPB) dynamic mechanical test. Thus, the damage process of sandstone under freeze-thaw cycle and impact load is studied. Also, the dynamic compressive strength and dynamic elastic modulus of sandstone are analysed under different loading strain rates and freeze-thaw cycle based on LS-DYNA, a dynamic finite element program. The results showed that the dynamic compressive strength of sandstone subjected to multiple freeze-thaw cycles under 0.04 MPa air pressure has a greater damage ratio than that under 0.055 MPa and 0.07 MPa air pressure, which was more likely to cause damage to slope sandstone than in actual engineering; the dynamic compressive strength and elastic modulus of sandstone decrease greatly within a certain range of freeze-thaw cycles and loading strain rate, leading to significant deterioration. When the freeze-thaw cycle exceeded 200 times and the strain rate was greater than 200 s−1, the physical and mechanical properties of sandstone gradually tended to be stable.

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“…It is also the base of multi-field coupling, phase transition process and other mechanisms research. Many scholars have achieved fruitful results in the basic physical and mechanical parameters of frozen rock [5][6][7][8]. With the application of damage mechanics, the exploration of the damage evolution characteristics of rock materials is developing rapidly.…”

Section: Introductionmentioning

confidence: 99%

Uniaxial Compression Fractal Damage Constitutive Model of Rock Subjected to Freezing and Thawing

Zhou¹,

Jiang²,

Luo³

et al. 2020

Period. Polytech. Civil Eng.

Self Cite

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Mechanical properties of the rock in the cold regions are often affected by freeze-thaw cycles and loads. It is of great theoretical significance and engineering value to establish a uniaxial compression damage constitutive model of the rock under freeze-thaw cycles that can reflect the relationship between macroscopic and mesoscopic structural damage. In this paper, macroscopic and mesoscopic methods are combined with statistical methods to quantitatively analyze the damage degree of rock under freeze-thaw cycles and loads. Combined with the fractal features of the macroscopic image of the section, a fractal damage constitutive model considering the residual strength of rock is established. In addition, the model is subsequently verified by the experiment. The experiment shows that the mechanical properties of rocks subjected to freeze-thaw cycles and loads are determined by freeze-thaw damage variables, load damage variables, and their coupling effects. As the number of freeze-thaw cycles increases, the uniaxial compressive strength and elastic modulus of rocks decrease, and peak strain increases. By using the fractal dimension of the compression fracture surface as a bridge considering the residual strength of the rock, the constitutive model can better reflect the compaction stage, elastic deformation stage and plastic deformation stage of the uniaxial compression process of the freeze-thaw rocks.

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Damage Characteristics of Altered and Unaltered Diabases Subjected to Extremely Cold Freeze–Thaw Cycles

Cited by 69 publications

References 8 publications

Effect of Freeze-Thaw Cycles on Triaxial Strength Property Damage to Cement Improved Aeolian Sand (CIAS)

Effect of Freeze-Thaw Cycles on Triaxial Strength Property Damage to Cement Improved Aeolian Sand (CIAS)

Study on Long-Term Dynamic Mechanical Properties and Degradation Law of Sandstone under Freeze-Thaw Cycle

Uniaxial Compression Fractal Damage Constitutive Model of Rock Subjected to Freezing and Thawing

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