Study on dynamic mechanical properties and meso-damage mechanism of jointed rock under impact load

Wang, Gang; Luo, Yi; Li, Xinping; Liu, Tingting; Ma, Ruiqiu; Qu, Dengxing

doi:10.1080/19648189.2019.1697901

Cited by 9 publications

(3 citation statements)

References 22 publications

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“…In primary materials, there is damage. With the effect of external environment and load, microfissures, microvoids, shear bands, and other mesodamaged elements in the material began to initiate, converge, and develop, and finally formed a dynamic evolution process of damage [17]. erefore, this article selects the macro aspect as the benchmark for measuring damage, studies the damage changes of freeze-thaw saturated rocks, and reveals the damage characteristics reflected by the changes of rock macrophysical phenomena.…”

Section: Damage Performance Of Freeze-aw Saturated Rockmentioning

confidence: 99%

Physics and Dynamics Characteristics and Energy Analysis of Freeze‐Thaw Limestone

Ping

Sun

Zhang

et al. 2020

Advances in Civil Engineering

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In order to study the physical and dynamic properties of rock after damage, an open-type saturated water freeze-thaw test at ±20°C was carried out on the limestone specimen, the size, quality, and longitudinal wave velocity with measured after freeze-thaw cycles for 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, and 100 times, and the SHPB test device was used to carry out the impact compression test with eight kinds of loading rate. This text analyzes the damage evolution characteristics on the physical properties of limestone of cycle times of freeze-thaw and discusses the dynamic compression mechanical characteristics and energy dissipation law of limestone specimens after freeze-thaw cycles. The test results show that the mass and longitudinal wave velocity of the specimen decreased and the volume and density increased. The damage factors have the quadratic function positive correlation with the cycle time of freeze-thaw. Moreover, the dynamic compression stress-strain curves of the specimens under different loading rates are similar in shape, and the curve shows an upward trend with increasing loading speed. In addition, with the loading rate increasing, the dynamic compressive strength and dynamic elastic modulus of the specimen increased and the dynamic strain decreased. In the SHPB test, the reflected energy, transmitted energy, and absorbed energy all increased linearly with incident energy. The dynamic compressive strength and absorbed energy increase as a power function, and the strain rate and absorbed energy increase as a quadratic function.

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Section: Damage Performance Of Freeze-aw Saturated Rockmentioning

confidence: 99%

Physics and Dynamics Characteristics and Energy Analysis of Freeze‐Thaw Limestone

Ping

Sun

Zhang

et al. 2020

Advances in Civil Engineering

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“…Drilling and blasting is mostly applied in mines in southern China, and the coupling analysis model is used without considering the disturbance of blasting to the surrounding rocks before the working face. Based on the experimental research and numerical analysis results [41][42][43], the disturbance depth of ordinary blasting, smooth blasting, and presplitting blasting to the surrounding rocks is about 1.5 m; meanwhile, disturbance depth increases with the increment of a single segment explosive dosage. So, safety thickness of water-proof rock pillar setting in mining engineering is the sum of the blasthole depth h 1 , blasting disturbance depth h 2, and safety caculation thickness h 3 of the water-proof rock pillar, which can be denoted as follows:…”

Section: Safetymentioning

confidence: 99%

Linkage Analysis between Solid-Fluid Coupling and the Strength Reduction Method for Karst Cave Water Inrush in Mines

Zhao

Liao

Liu

et al. 2020

Shock and Vibration

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The present paper aims to study the mechanical mechanism and characteristics of water irruption from Karst cave. Combining the nonlinear seepage-pipe coupling model with the strength reduction method, the linkage analysis of fluid solid coupling and strength reduction method are constructed to study the whole process of confined Karst cave water inrush. Taking the water inrush accident of Shibaijing of the Qiyi mine in south China as an example, the instability mechanism of the water-proof rock pillar and evolution of water inrush are discussed. It is suggested that water discharge on the working face augments with the increase in the reduction factor of the water-proof rock pillar before the rock pillar loses its stability. Once the rock pillar becomes unstable, Karst water bursts from confined Karst cave in a pipe flow shape, and the water irruption quantity reaches the peak value in a short time by adopting the pipe flow to simulate and then decreases slowly. The hydraulic rough flow at the initial stage changes into pipe laminar flow finally in the process of Karst water inrush, due to the constraint of Karst cave water reserve. The conception for the safety factor of the water-proof rock pillar introduced, the relation of the safety factor, Karst cave water pressure, and thickness of the water-proof rock pillar are studied. It is proposed that thickness of the water-proof rock pillar whose safety factor equals 1.5 is regarded as the calculating safety thickness of the water-proof rock pillar, and the safety thickness of the water-proof rock pillar setting in mining engineering should be equal to the sum of the blasthole depth, blasting disturbance depth, and the calculating safety thickness. The reason leading to Karst water inrush of Qiyi Mine is that without advanced boreholes, the water-proof rock pillar is set so small that it could not possess safety margin, so the confined Karst cave water breaks the water-proof rock pillar and bursts out. Combining the solid fluid coupling theory, pipe flow theory, and strength reduction method, the nonlinear mechanical response of confined Karst cave water inrush is studied, which provides a new study method for the whole process of confined Karst cave water inrush.

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“…Generally, there are a large number of crisscross joints with different occurrences and scales in the rock mass, which control the deformation and failure of the rock mass (Pollard & Aydin.1988;Wang et al 2020;Wang et al 2022;.Engineering practices have proved that the instability of engineering rock mass is directly related to the failure of joint (Barton & Choubey.1977;Ladanyi & Archambault.1969;Han et al 2022) Therefore, the exploration of the relationship between the surface morphology and failure characteristics of joint and its shear strength is of great significance for the analysis of rock mass stability.…”

Section: Introductionmentioning

confidence: 99%

Evaluation method of local failure characteristics for joint based on white light scanning technology

Song

Zhang²,

Wang³

et al. 2022

Nat Hazards

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Joint is one of the important factors affecting the stability of engineering rock mass. To quantitatively analyze the local failure characteristics of joint, the point cloud data of its morphology before and after shear were obtained by 3D white light scanning technology. Firstly, the problem of cloud surface skew of point cloud data was solved by constructing rotation matrix and translation matrix based on the principle of least square method, and the datum plane of joint was determined. Then, the datum plane of the joint before and after shear was adjusted to be consistent based on the point cloud data of the marked points and the undamaged area of the joint, and the point cloud data with equal spacing were obtained by one-dimensional or two-dimensional interpolation algorithm. Finally, a 3D description method of joint local Morphological characteristics is proposed. The proposed method can determine the scope of surface failure of joint, quantitatively analyze the locality of its failure characteristics, and provide data support for distinguishing the types of shear failure and further research on shear mechanism.

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Study on dynamic mechanical properties and meso-damage mechanism of jointed rock under impact load

Cited by 9 publications

References 22 publications

Physics and Dynamics Characteristics and Energy Analysis of Freeze‐Thaw Limestone

Physics and Dynamics Characteristics and Energy Analysis of Freeze‐Thaw Limestone

Linkage Analysis between Solid-Fluid Coupling and the Strength Reduction Method for Karst Cave Water Inrush in Mines

Evaluation method of local failure characteristics for joint based on white light scanning technology

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