Stability analysis for toppling failure of unstable rock in Three Gorges reservoir area, China

Wang, G; Wu, Fa-Quan; Ye, W

doi:10.1201/b14917-77

Cited by 8 publications

(5 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our first evaluated kinematic failure mode was toppling of a single rock body (block, column, or slab) from the propagation of a rear bounding fracture (e.g., Wyllie, 1980), which we herein refer to as slab toppling (Figure 1a). Slab toppling failures are common in granitic rocks (e.g., Colombero et al., 2018), anaclinal slopes in hard limestone cliffs (Frayssines & Hantz, 2009) and interbedded sandstones and mudstones, where undercutting from differential weathering initiates toppling and the propagation of tension cracks at the crest of the slope (Wang et al., 2013). This case was chosen because it is common to many investigations of resonance in unstable rock compartments (Bottelin et al., 2017; Bottelin, Jongmans, et al., 2013; Bottelin, Lévy, et al., 2013; Colombero et al., 2018, 2021; Lévy et al., 2010) and reflects the geometry of our Courthouse Mesa field site, which was used for comparison with model results (Bessette‐Kirton et al., 2022).…”

Section: Methodsmentioning

confidence: 99%

Coevolution of Rock Slope Instability Damage and Resonance Frequencies From Distinct‐Element Modeling

Jensen,

Moore

2023

JGR Earth Surface

View full text Add to dashboard Cite

Ambient vibration measurements can detect resonance frequency changes related to rock slope instability damage or boundary condition changes during progressive failure. However, the impact of slope kinematics on resonance changes and the expected form and sensitivity of frequency evolution during destabilization require clarification to improve the implementation of this technique across diverse settings. Since instrumented rock slope failures are rare, numerical modeling is needed to study the anticipated spectral response from in situ monitoring. We used 2D distinct‐element modeling to evaluate the sensitivity and evolution of rock slope resonance behavior for slab toppling, flexural toppling, and planar sliding instabilities during progressive failure. Model simulations revealed that fundamental resonance frequency decreases between 20% and 60% with changes correlated with increasing length of open joints. Changes to higher‐order frequencies associated with landslide sub‐volumes were also detectable for cases with multiple fracture networks. Resonance behavior was most pronounced for failures dominated by steeply dipping open tension cracks, that is, flexural and slab toppling. Additionally, amplification patterns across the slope varied for the flexural toppling and sliding cases, providing potential new information with which to characterize landslide failure mechanisms using ambient vibration array measurements. Our results demonstrate landslide characteristics well‐suited for in situ ambient resonance monitoring and provide new data describing the anticipated changes in resonance frequencies during progressive rock slope failure.

show abstract

Section: Methodsmentioning

confidence: 99%

Coevolution of Rock Slope Instability Damage and Resonance Frequencies From Distinct‐Element Modeling

Jensen,

Moore

2023

JGR Earth Surface

View full text Add to dashboard Cite

show abstract

“…To summarize, the total toppling failure occurs due to erosion notches and tension cracks and continues on to gravitational transport and accumulation (Wang et al, 2013).…”

Section: Toppling Failurementioning

confidence: 99%

Structurally controlled hazard mapping of Southern Leyte, Philippines

Luzon

Montalbo

Galang

et al. 2015

Preprint

View full text Add to dashboard Cite

Abstract. The 2006 Guinsaugon landslide in St. Bernard, Southern Leyte is one of the largest known landslides in the Philippines in recent history. It consists of a 15–20 million m3 rockslide-debris avalanche from an approximately 675 m high mountain weakened by continuous movement of the Philippine fault. The catastrophic Guinsaugon landslide killed 1221 people and displaced 19 000 residents over its 4.5 km path. To investigate the present day morphology of the scar and potential failure that may occur, analysis of a 5 m resolution IfSAR-derived Digital Elevation Model was conducted using Coltop3D and Matterocking software, leading to the generation of a landslide hazard map for the province of Southern Leyte in Central Philippines. The dip and dip-direction of discontinuity sets that contribute to gravitational failure in mountainous areas of the province were identified and measured using a lower Schmidt-Lambert color scheme. After measurement of the morpho-structural orientations, potential sites of failure were analyzed. Conefall was then utilized to compute the extent of rock mass runout. Results of the analysis show instability in the scarp area of the 2006 Guinsaugon landslide and in adjacent slopes because of the presence of steep discontinuities that range from 45–60°. Apart from the 2006 Guinsaugon landslide site, runout models simulated farther rock mass extent in its adjacent slopes, revealing a high potential for fatal landslides to happen in the municipality of St. Bernard. Concerned agencies may use maps produced in the same manner as this study to identify possible sites where structurally-controlled landslides can occur. In a country like the Philippines, where fractures and faults are common, this type of simulated hazard maps would be useful for disaster prevention and facilitate disaster risk reduction efforts for landslide-susceptible areas.

show abstract

“…Most of slope movements can be categorized into four categories: planar, wedge, toppling, and circular failures based on their geometrical and mechanical nature of the discontinuity and the conditions of the rock masses (Wang et al 2013). Planar failures occur along prevalent joints dipping toward the slope with strike near parallel to the slope face (Alemdag et al 2014).…”

Section: Introductionmentioning

confidence: 99%

The quarries edges stability in opencast mines: a case study of the Jebel Onk phosphate mine, NE Algeria

et al. 2015

View full text Add to dashboard Cite

The experience which accumulated over many years on problems of slope instability in quarries and opencast mines led to the development of several reliable methodologies for predicting discontinuities and selecting related consolidation works. Sloped bench faces that compose the overall slope in the studied case in this paper are evaluated from the stability prospective by applying a variety of stability analysis methods such as stereographic projection and software methods. The adopted approach is based on laboratory tests on understudied samples to designate the mechanical parameters and numerical modeling by implementing the finite element method. The latter, a vital tool to the quantitative determination of deformation mechanisms in large slope instabilities, is used to unravel the uncertainty of mechanical homogeneity properties of the involved materials at the level of discrete meshes in numerical computations that type of application proposes a procedural combination of an assortment of calculation stability methods through three steps. The first step is to quantify the alteration and fracturing conditions and to determine the mechanical parameters of Kef Essenoun rock mass by using slope mass rating (SMR) classification scheme, developed by Romana, to depict the strength of an individual rock slope. This system is based on the rock mass rating (RMR) geo-mechanical classification system of rocks, developed by Bieniawski, who refurbished that system with quantitative guidelines to get the rate of influence of adverse joint orientations. The second step is to uses the abacus method to estimate the stability of open-pit mines. The last step is to use a numerical modeling by applying Plaxis 8.2 calculation code.

show abstract

Stability analysis for toppling failure of unstable rock in Three Gorges reservoir area, China

Cited by 8 publications

References 2 publications

Coevolution of Rock Slope Instability Damage and Resonance Frequencies From Distinct‐Element Modeling

Coevolution of Rock Slope Instability Damage and Resonance Frequencies From Distinct‐Element Modeling

Structurally controlled hazard mapping of Southern Leyte, Philippines

The quarries edges stability in opencast mines: a case study of the Jebel Onk phosphate mine, NE Algeria

Contact Info

Product

Resources

About