Fracture Behavior of Rock with Initial Damage: Theoretical, Experimental, and Numerical Investigations

Zhang, Hui; Guo, Panpan; Wang, Yixian; Zhao, Yanlin; Lin, Hang; Yan, Litan; Shao, Yahui

doi:10.1155/2020/8886843

Cited by 7 publications

(4 citation statements)

References 102 publications

(106 reference statements)

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“…Therefore, the non-destructive state of the research rock should be analyzed according to the formation conditions; in order to better understand the non-destructive state, a quantitative definition of non-destructive state wave speed determined from the drilling condition of rock is necessary. The non-destructive initial wave velocity is defined as the maximum value of the test results in relation to the statistical analysis and is given by Zhang [46]. The statistical formula for the longitudinal wave velocity is applied here and is defined as:…”

Section: The Definition Of Initial Damagementioning

confidence: 99%

Experimental Investigation of the Static and Dynamic Compression Characteristics of Limestone Based on Its Initial Damage

Wang

Zhang

et al. 2021

Applied Sciences

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In the current work a new equation for initial damage assessment of limestone based on plane strain theory is proposed. Detailed investigations of the static and dynamic characteristics of limestone with different initial damage degree, using longitudinal wave speed, and static-dynamic compression tests are performed. This study investigated the static and dynamic characteristics of limestone with different initial damage degree, using longitudinal wave speed, and static-dynamic compression tests. Experimental results show that the degree of initial damage decreases with increasing longitudinal wave speed, which reaches the minimum when the longitudinal wave speed is approximately 6000 m/s, and the smaller the longitudinal wave velocity, the greater the degree of initial damage. The static and dynamic compressive strengths of limestone increase with the longitudinal wave velocity and strain rate, but the elastic modulus and Poisson’s ratio do not change significantly. Finally, based on the experimental results, the definitions of damage threshold value and strain softening are proposed, which further verify the influence of strain rate and initial damage on rock compression characteristics. The present study sheds light on the importance of initial damage for the mechanical state of rock in underground engineering.

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Section: The Definition Of Initial Damagementioning

confidence: 99%

Experimental Investigation of the Static and Dynamic Compression Characteristics of Limestone Based on Its Initial Damage

Wang

Zhang

et al. 2021

Applied Sciences

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“…Rock instability and failure is a type of engineering disaster commonly encountered in underground rock construction [1][2][3], which seriously affects the safety of the project. There are many factors affecting the rock engineering stability, including geological factors such as the initial stress state of the rock mass, the rock mechanical properties and groundwater, as well as engineering factors such as construction methods and support installation time [4,5].…”

Section: Introductionmentioning

confidence: 99%

Research on Uniaxial Compression Mechanics of Diorite under Flowing Acidic Solution Scouring

Wei

Zhang

et al. 2022

Minerals

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The bedrock used for underground construction has obvious traces of hydrodynamic scouring damage, and the mechanical properties of bedrock especially are severely damaged under a groundwater environment. On this basis, considering the excavated bedrock under various saturations, the uniaxial compression test of diorite is carried out. Meanwhile, scanning electron microscopy (SEM), electron energy spectroscopy (EDS) and X-ray diffraction (XRD) are used in the experiment. The variation law of the elastic p-wave velocity and microstructure and the response characteristics of the strength, deformation and mechanical parameters of rock under different flow rates and pH values are analyzed in detail. The results indicate that: (1) Saturations with a faster flow rate and lower pH value cause greater relative changes in the elastic longitudinal wave velocity of the samples. (2) The uniaxial compressive strength of the samples under various treatment conditions showed a decreasing trend. Compared with the dried samples, the uniaxial compressive strength of the samples under saturation with field flow rate v = 300 mm·s−1 and pH = 1 decreased by 46.08%, and the strength decreased by 35.67% under saturation with a field pH value = 6.56 and flow rate v = 900 mm-s−1. (3) The saturation with a stronger acidity, greater flow rate and longer action time causes the apparent dense structure of the diorite sample to be loose and accompanied by microcracks, which weakens its macromechanical properties. (4) Acid and hydrodynamic saturation produce water–rock chemical and physical effects on diorite, which weaken the connection force between mineral particles and the friction between fracture surfaces, reduce the elastic modulus, increase Poisson’s ratio and accelerate the failure of diorite.

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“…Water infiltration and hydraulic coupling have a greater impact on rock mechanical properties [6,7], As the main body of the coral reef, its physical and engineering properties determine the construction of various projects. At the same time, due to the special composition and complex origin of reef limestone, the properties of the reef limestone are quite different from other common sedimentary rocks [8,9], and the seepage of the rock and the defects of the rock itself have a great influence on the mechanical properties [10,11], more serious in hydration corrosive environments [12,13]. However, the marine environment contains a large number of corrosive ions, which has a serious adverse effect on the service performance and structural safety of coral sand cementbased structures [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Mechanism of Graphene Oxide-Modified Coral Sand Cement Mortar to Resist Sulfate Erosion

et al. 2022

Self Cite

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Coral sand particles with low strength and rich pores affect the mechanical properties and durability of their cement-based materials. This paper investigates the mechanical properties and internal pore evolution of graphene oxide-modified coral sand cement mortar under sulfate erosion environment, aiming to better understand the effect of graphene oxide on the mechanical properties of coral sand cement mortar under an erosion environment, especially in wet and dry cycles. Mechanical properties of coral sand cement mortar were tested with different amounts of graphene oxide and different erosion cycles to understand the relationship between the change of flexural and compressive strength and the content and erosion cycle. The microscopic parameters of hydration products and internal dissolution pores were analyzed by XRD and SEM. The results showed that the degree of erosion performance improvement is related to the content of GO, and the two are positively correlated at first and then negatively correlated. At 0.03 wt% content, the retardation effect is the best. There were more orderly pore arrangement with less morphological complexity, when the dissolution amount of Ca(OH)2, porosity, total pore area, pore number, probability entropy, average form factor, and fractal dimension decreased. Coral sand cement mortar increases resistance to sulfate attack, which graphene oxide inhibits the formation of new dissolution pores and the expansion of original pores.

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Fracture Behavior of Rock with Initial Damage: Theoretical, Experimental, and Numerical Investigations

Cited by 7 publications

References 102 publications

Experimental Investigation of the Static and Dynamic Compression Characteristics of Limestone Based on Its Initial Damage

Experimental Investigation of the Static and Dynamic Compression Characteristics of Limestone Based on Its Initial Damage

Research on Uniaxial Compression Mechanics of Diorite under Flowing Acidic Solution Scouring

Experimental Study on Mechanism of Graphene Oxide-Modified Coral Sand Cement Mortar to Resist Sulfate Erosion

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