An improved equivalent viscoelastic medium method for wave propagation across layered rock masses

Li, Jianchun; Li, Haibo; Zhao, Jun

doi:10.1016/j.ijrmms.2014.10.008

Cited by 82 publications

(8 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the researches on the dynamic behavior of transversely isotropic rock are important and necessary. In the theory of stress wave propagation, Li et al [16] have proposed an equivalent viscoelastic medium method to investigate stress wave propagating across layered rock masses, and they found that the incident angle and the thickness of layered rock mass can affect wave propagation properties. Zhu and Zhao [17] have used virtual wave source method to analyze the obliquely incident stress wave propagating across rock joints and have observed that the amplitude of superposed transmitted wave increases with increasing the incident angel of P-wave.…”

Section: Shock and Vibrationmentioning

confidence: 99%

Dynamic Fracturing Behavior of Layered Rock with Different Inclination Angles in SHPB Tests

Qiu

et al. 2017

Shock and Vibration

View full text Add to dashboard Cite

The fracturing behavior of layered rocks is usually influenced by bedding planes. In this paper, five groups of bedded sandstones with different bedding inclination angles are used to carry out impact compression tests by split Hopkinson pressure bar. A highspeed camera is used to capture the fracturing process of specimens. Based on testing results, three failure patterns are identified and classified, including (A) splitting along bedding planes; (B) sliding failure along bedding planes; (C) fracturing across bedding planes. The failure pattern (C) can be further classified into three subcategories: (C1) fracturing oblique to loading direction; (C2) fracturing parallel to loading direction; (C3) mixed fracturing across bedding planes. Meanwhile, a numerical model of layered rock and SHPB system are established by particle flow code (PFC). The numerical results show that the shear stress is the main reason for inducing the damage along bedding plane at = 0 ∘ ∼75∘ . Both tensile stress and shear stress on bedding planes contribute to the splitting failure along bedding planes when the inclination angle is 90 ∘ . Besides, tensile stress is the main reason that leads to the damage in rock matrixes at = 0 ∘ ∼90∘ .

show abstract

Section: Shock and Vibrationmentioning

confidence: 99%

Dynamic Fracturing Behavior of Layered Rock with Different Inclination Angles in SHPB Tests

Qiu

et al. 2017

Shock and Vibration

View full text Add to dashboard Cite

show abstract

“…Over the past decades, extensive research has been done to investigate wave propagation in fractured rocks based on theoretical analysis (Schoenberg 1980 ; Hudson 1981 ; Crampin 1984 ; Pyrak-Nolte and Cook 1987 ; Shapiro and Kneib 1993 ; Pyrak-Nolte and Nolte 1995 ; Zhao and Cai 2001 ; Perino et al 2010 ; Li 2013 ; Li et al 2014 , 2015 ; Fan et al 2018 , 2021 ), laboratory experiments (Pyrak-Nolte et al 1990 ; Pyrak-Nolte 1996 ; Huang et al 2014 ; Chen et al 2015 , 2016 ; Zhu et al 2015 ; Liu et al 2017 ; Li et al 2017 , 2019 ; Modiriasari et al 2020 ), and numerical simulations (Vlastos et al 2003 , 2007 ; Wang et al 2006 , 2022 ; Deng et al 2012 ; Fan et al 2013 ; Fu et al 2015 ; Yousef and Angus 2016 ; Chen et al 2019 ; Zhu et al 2020 ; Lei and Sornette 2021a , b ; Yang et al 2021 ; Sawayama et al 2022 ). The elementary scenario for studying wave propagation in fractured rock is the transmission of wave energy across a single fracture, which is controlled by the fracture stiffness, wave frequency, and matrix properties (Schoenberg 1980 ; Pyrak-Nolte et al 1990 ).…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study of Elastic Wave Arrival Behavior in a Naturally Fractured Rock Based on a Combined Displacement Discontinuity-Discrete Fracture Network Model

et al. 2022

View full text Add to dashboard Cite

The arrival behavior of elastic waves in a naturally fractured rock is studied based on numerical simulations. We use the discrete fracture network method to represent the distribution of a natural fracture system and employ the displacement discontinuity method to compute the propagation of elastic waves across individual fractures. We analyze macroscopic wavefield arrival properties collectively arising from the interaction between elastic waves and numerous fractures in the system. We show that the dimensionless angular frequency ῶ = ωZ/κ exerts a fundamental control on the arrival behavior of a plane wave traveling through the fractured rock, where ω, Z, and κ are the angular frequency, seismic impedance, and fracture stiffness, respectively. An asynchronous arrival phenomenon of the wave energy occurs and becomes more significant with an increased ῶ. Two regimes are identified according to the two-branch dependency of the fractal dimension D of the FFAW on ῶ, where the wave arrival behavior is within a non-fractal regime for ῶ smaller than the critical frequency ῶc ≈ 1.0, and enters the fractal regime for ῶ ≥ ῶc. The self-affine properties of the FFAW, i.e., the roughness exponent α and the correlation length lc, both linearly decrease as a function of the exponent ξ (with ῶ = 10ξ) in the fractal regime. Early breakthrough of wave transport occurs in regions with relatively low fracture density, while late-time arrival happens in regions of high fracture density.

show abstract

“…The deformation behavior and fracture pattern under dynamic loads (high strain rate) are essential for many applications [32]. Fracture initiation and propagation under static compression loads have been reported in the literature; however, failure characteristics and deformation patterns are also strongly influenced by the dynamic compression load, especially in the presence of micro-fractures or defects [33,34].…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Static and Dynamic Mechanical Behavior for Dry and Saturated Cement Mortar

et al. 2019

View full text Add to dashboard Cite

Deformational and breakage behaviors of concrete and cement mortar greatly influence various engineering structures, such as dams, river bridges, ports, tunnels, and offshore rig platforms. The mechanical and petrophysical properties are very sensitive to water content and are controlled by the liquid part in pore spaces to a large extent. The objective of this paper is to investigate the water saturation effect on the strength characteristics and deformability of cement mortar under two loading conditions, static and dynamic compression. A set of cement mortar samples was prepared and tested to study the mechanical behavior in dry and saturated states. The first part of the research incorporates the study of static mechanical properties for dry and brine-saturated cement mortar through uniaxial compressive strength tests (UCS). Second, drop-weight impact experiments were carried out to study the dynamic mechanical properties (impact resistance, deformation pattern, and fracture geometry) for dry and saturated cases. The comparative analysis revealed that water saturation caused substantial changes in compressive strength and other mechanical characteristics. Under static loading, water saturation caused a reduction in strength of 36%, and cement mortar tended to behave in a more ductile manner as compared to dry samples. On the contrary, under dynamic loading conditions, water saturation resulted in higher impact resistance and fracture toughness as compared to dry conditions. In addition, fractures could propagate to smaller depths as compared to dry case. The study will help resolve many civil, mining, and petroleum engineering problems where cement structures undergo static as well as dynamic compression, especially in a hydraulic environment where these structures interact with the water frequently. To the best of our knowledge, the effect of water saturation on the dynamic mechanical properties of cement mortar has not been well understood and reported in the literature.

show abstract

An improved equivalent viscoelastic medium method for wave propagation across layered rock masses

Cited by 82 publications

References 30 publications

Dynamic Fracturing Behavior of Layered Rock with Different Inclination Angles in SHPB Tests

Dynamic Fracturing Behavior of Layered Rock with Different Inclination Angles in SHPB Tests

A Numerical Study of Elastic Wave Arrival Behavior in a Naturally Fractured Rock Based on a Combined Displacement Discontinuity-Discrete Fracture Network Model

Comparative Analysis of Static and Dynamic Mechanical Behavior for Dry and Saturated Cement Mortar

Contact Info

Product

Resources

About