Characterization of the Body Wave Anisotropy of an Interbedded Sandstone-Shale at Multi Orientations and Interlayer Ratios

Abbas, Hasan Ali; Mohamed, Zainab; Mohd-Nordin, Mohd Mustaqim

doi:10.1007/s10706-022-02096-8

Cited by 5 publications

(4 citation statements)

References 31 publications

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“…The above laboratory methods are considered to be nondestructive tests dealing with elastic or elastic-plastic wave propagation. They are followed by many researches utilizing these techniques to characterize the elastic properties of soils [53][54][55][56][57] and rocks [58][59][60][61].…”

Section: Measurement Of V Smentioning

confidence: 99%

Exploring Shear Wave Velocity—NSPT Correlations for Geotechnical Site Characterization: A Review

Abbas,

Al-Jeznawi,

Al-Janabi

et al. 2024

CivilEng

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Shear wave velocity (Vs) is a critical parameter in geophysical investigations, micro-zonation research, and site classification. In instances where conducting direct tests at specific locations is challenging due to equipment unavailability, limited space, or initial instrumentation costs, it becomes essential to estimate Vs directly, using empirical correlations for effective site characterization. The present review paper explores the correlations of Vs with the standard penetration test (SPT) for geotechnical site characterization. Vs, a critical parameter in geotechnical and seismic engineering, is integral to a wide range of projects, including foundation design and seismic hazard assessment. The current paper provides a detailed analysis of the key findings, implications for geotechnical engineering practice, and future research needs in this area. It emphasizes the importance of site-specific calibration, the impact of geological background, depth-dependent behavior, data quality control, and the integration of Vs data with other geophysical methods. The review underlines the continuous monitoring of Vs values due to potential changes over time. Addressing these insights and gaps in research contributes to the accuracy and safety of geotechnical projects, particularly in seismic-prone regions.

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Section: Measurement Of V Smentioning

confidence: 99%

Exploring Shear Wave Velocity—NSPT Correlations for Geotechnical Site Characterization: A Review

Abbas,

Al-Jeznawi,

Al-Janabi

et al. 2024

CivilEng

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“…This finding suggests that sandstone exhibits higher brittleness compared to shale, as indicated by its higher elastic modulus and failure strain values [18]. This difference could be attributed to the higher grain-to-matrix ratio in sandstone compared to shale, as well as the presence of micro-gaps along the shale bedding [13]; [33]. The mechanical properties of the planar joint of sandstone, sandstone-shale, and shale are summarized in Tab.2.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…Sandstone is characterized as a gritty, massive rock material with high strength under point loading and medium strength under punch loading [6]; [11]. In contrast, shale is recognized as a soft, weak rock [12] with an evident anisotropic behavior [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Shear strength characteristics of weathered jointed Kenny Hill interbedded formation for cylindrical specimen under direct shear test

Abbas,

Mohamed,

Taher

et al. 2023

International Journal of Applied Mechanics and Engineering

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The sliding failures commonly occur in interbedded formations along the weakness plane of the bedding plane a sedimentary rock or the joint interface. Therefore, studying the shear strength characteristics at the bedding plane or interface is crucial for evaluating the expected failure plane. In this study, the shear strength characteristics of planar jointed Kenny Hill shale, sandstone, and shale-sandstone specimens were investigated using the direct shear box method. The results reveal that the friction angle values for the planar sandstone, shale-sandstone, and shale are 31.28°, 21.1°, and 19.34°, respectively. These findings, combined with the shear stress-strain behavior, suggest that the interface (shale-sandstone) is primarily influenced by the shale characteristics rather than the sandstone characteristics. Hence, it is important to consider failure along the interface when analyzing critical conditions, particularly in slope failure scenarios.

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“…Wang 9 considered the Hami open-pit coal mine as the research subject, determined the position of the weak interlayer in the slope by analyzing the deformation profile, regarded the weak interlayer rock mass as a complete mechanical system, established the mechanical model of the weak interlayer rock mass system, and proposed an index for evaluating the degree of failure before instability occurs. Abbas 10 conducted research on the mechanical properties of sandstone-shale-sandstone multi-layer composite rock mass with different interlayer angles, studied the elastic response of wave speed propagation, and revealed that the elastic modulus and shear modulus of composite rock mass varies with the interlayer angle. With the increasing angle, its stiffness has a more significant effect, and the anisotropic behavior of the wave velocity in the composite rock mass is affected by the direction of the joint, not by the shale interlayer.…”

Section: Introductionmentioning

confidence: 99%

Damage characteristics of weak rocks with different dip angles during creep

Miao

Zhao

Lixin

et al. 2023

Sci Rep

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To investigate the influence of the weak layer dip angle on the creep rupture of the composite rock mass, this paper conducts a graded loading creep experiment on the composite rock mass with different dip angles using the acoustic emission method to examine the fracture evolution process. With increasing load grade, the cumulative total ring count of the rock mass shows a “U”-shaped trend, and the acoustic emission spatial positioning results show that acoustic emission events in the rock mass fracture process are primarily concentrated in the vicinity of the weak layer, while events in other areas are few and dispersed. For rock masses with weak layer dip angles of 0° and 15°, cracks occur in both soft and hard rocks, where shear cracks are dominant in soft rocks, tensile cracks are dominant in hard rocks, and finally, the rock mass mainly exhibits tensile splitting failure. For rock masses with weak layer dip angles of 30° and 45°, most of the cracks exist in the interior of the soft rock, which is dominated by shear cracks. With increasing graded loads, the shear cracks continue to develop along the direction of the weak layer, the upper rock mass keeps slipping and dislocating, and the final failure mode is mainly shear-slip failure. The damage evolution varies with the inclination angle of the weak layer, which can be divided into three stages: initial damage accumulation, damage acceleration, and damage destruction. This demonstrates the ability to predict, prevent, and control the occurrence of creep disasters in rock masses with weak layers.

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Characterization of the Body Wave Anisotropy of an Interbedded Sandstone-Shale at Multi Orientations and Interlayer Ratios

Cited by 5 publications

References 31 publications

Exploring Shear Wave Velocity—NSPT Correlations for Geotechnical Site Characterization: A Review

Exploring Shear Wave Velocity—NSPT Correlations for Geotechnical Site Characterization: A Review

Shear strength characteristics of weathered jointed Kenny Hill interbedded formation for cylindrical specimen under direct shear test

Damage characteristics of weak rocks with different dip angles during creep

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