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Seismic Stability Assessment of Rock Slopes Using Limiting Slope Face Concept
https://orcid.org/0000-0002-9990-0468
Abstract This study communicates a novel seismic stability assessment of rock slopes based on the concept of the limiting slope face (LSF) combined with the method of stress characteristics (MSC) and the modified pseudo-dynamic (MPD) approach. The slope geometry with a target factor of safety (FS) of 1.0 is derived, precluding the need for any preordained slip surfaces in the analysis. Subsequently, the derived LSF in cognition with the morphological aspects indeed acts as a self-guided stability index for rock slopes. Besides, a realistic characterization of the dynamic properties of input earthquake motions satisfying the zero stress boundary conditions is apprehended through the coherent utilization of the MPD approach. The generalized Hoek–Brown (GHB) strength criterion is engaged to capture the factual non-linearity present in the rock strength. Compared to the reported investigations, the present results indicate that the developed curvilinear LSFs are steeper than the traditional linear slopes commonly encountered in the conventional practice. A parametric study accounting for the effect of different influential parameters on the behavior of LSFs is performed in view of various prospective design challenges in rock engineering. With a rise in the horizontal seismic acceleration coefficient (kh) from 0.1 to 0.3, a nearly threefold increase in the magnitude of the major principal stress orientation (ψ) at the slope crest but along the slope can be observed. Such enhancement in ψ indicates significantly flat LSF. A sudden rise in the magnitude of ψ can also be observed at the fundamental frequencies of seismic waves due to resonance. However, at kh = 0.1, such aptness declines by 54% at the first fundamental frequency of the shear wave as the rock mass damping increases from 5 to 15%. Thus, the present approach attributes to a rational way for seismic design and stability assessment of rock slopes. Several real-life case studies adopting the current LSF concept further exhibit the accuracy, rationality, and robustness of the proposed methodology. HighlightsConcept of limiting slope face is introduced for the seismic performance of rock slopes.Analysis is performed using an integrated framework of generalized Hoek-Brown criterion, method of stress characteristics and modified pseudo-dynamic approach.An adaptive collapse mechanism is investigated in response to varying seismic wave characteristics and rock mass parameters.A comprehensive review of other prevailing analytical seismic approaches is provided.Rationality of the results is ensured through validation with different published case studies.
Seismic Stability Assessment of Rock Slopes Using Limiting Slope Face Concept
https://orcid.org/0000-0002-9990-0468
Abstract This study communicates a novel seismic stability assessment of rock slopes based on the concept of the limiting slope face (LSF) combined with the method of stress characteristics (MSC) and the modified pseudo-dynamic (MPD) approach. The slope geometry with a target factor of safety (FS) of 1.0 is derived, precluding the need for any preordained slip surfaces in the analysis. Subsequently, the derived LSF in cognition with the morphological aspects indeed acts as a self-guided stability index for rock slopes. Besides, a realistic characterization of the dynamic properties of input earthquake motions satisfying the zero stress boundary conditions is apprehended through the coherent utilization of the MPD approach. The generalized Hoek–Brown (GHB) strength criterion is engaged to capture the factual non-linearity present in the rock strength. Compared to the reported investigations, the present results indicate that the developed curvilinear LSFs are steeper than the traditional linear slopes commonly encountered in the conventional practice. A parametric study accounting for the effect of different influential parameters on the behavior of LSFs is performed in view of various prospective design challenges in rock engineering. With a rise in the horizontal seismic acceleration coefficient (kh) from 0.1 to 0.3, a nearly threefold increase in the magnitude of the major principal stress orientation (ψ) at the slope crest but along the slope can be observed. Such enhancement in ψ indicates significantly flat LSF. A sudden rise in the magnitude of ψ can also be observed at the fundamental frequencies of seismic waves due to resonance. However, at kh = 0.1, such aptness declines by 54% at the first fundamental frequency of the shear wave as the rock mass damping increases from 5 to 15%. Thus, the present approach attributes to a rational way for seismic design and stability assessment of rock slopes. Several real-life case studies adopting the current LSF concept further exhibit the accuracy, rationality, and robustness of the proposed methodology. HighlightsConcept of limiting slope face is introduced for the seismic performance of rock slopes.Analysis is performed using an integrated framework of generalized Hoek-Brown criterion, method of stress characteristics and modified pseudo-dynamic approach.An adaptive collapse mechanism is investigated in response to varying seismic wave characteristics and rock mass parameters.A comprehensive review of other prevailing analytical seismic approaches is provided.Rationality of the results is ensured through validation with different published case studies.
Seismic Stability Assessment of Rock Slopes Using Limiting Slope Face Concept
https://orcid.org/0000-0002-9990-0468
Abstract This study communicates a novel seismic stability assessment of rock slopes based on the concept of the limiting slope face (LSF) combined with the method of stress characteristics (MSC) and the modified pseudo-dynamic (MPD) approach. The slope geometry with a target factor of safety (FS) of 1.0 is derived, precluding the need for any preordained slip surfaces in the analysis. Subsequently, the derived LSF in cognition with the morphological aspects indeed acts as a self-guided stability index for rock slopes. Besides, a realistic characterization of the dynamic properties of input earthquake motions satisfying the zero stress boundary conditions is apprehended through the coherent utilization of the MPD approach. The generalized Hoek–Brown (GHB) strength criterion is engaged to capture the factual non-linearity present in the rock strength. Compared to the reported investigations, the present results indicate that the developed curvilinear LSFs are steeper than the traditional linear slopes commonly encountered in the conventional practice. A parametric study accounting for the effect of different influential parameters on the behavior of LSFs is performed in view of various prospective design challenges in rock engineering. With a rise in the horizontal seismic acceleration coefficient (kh) from 0.1 to 0.3, a nearly threefold increase in the magnitude of the major principal stress orientation (ψ) at the slope crest but along the slope can be observed. Such enhancement in ψ indicates significantly flat LSF. A sudden rise in the magnitude of ψ can also be observed at the fundamental frequencies of seismic waves due to resonance. However, at kh = 0.1, such aptness declines by 54% at the first fundamental frequency of the shear wave as the rock mass damping increases from 5 to 15%. Thus, the present approach attributes to a rational way for seismic design and stability assessment of rock slopes. Several real-life case studies adopting the current LSF concept further exhibit the accuracy, rationality, and robustness of the proposed methodology. HighlightsConcept of limiting slope face is introduced for the seismic performance of rock slopes.Analysis is performed using an integrated framework of generalized Hoek-Brown criterion, method of stress characteristics and modified pseudo-dynamic approach.An adaptive collapse mechanism is investigated in response to varying seismic wave characteristics and rock mass parameters.A comprehensive review of other prevailing analytical seismic approaches is provided.Rationality of the results is ensured through validation with different published case studies.
Seismic Stability Assessment of Rock Slopes Using Limiting Slope Face Concept
Nandi, Shibsankar (author) / Ghosh, Priyanka (author)
2023
Article (Journal)
Electronic Resource
English
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
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