Assessment of Stability of Slopes under Drawdown Conditions

Lane, Phil; Griffiths, D. V.

doi:10.1061/(asce)1090-0241(2000)126:5(443)

Cited by 170 publications

(75 citation statements)

References 8 publications

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“…where, [19], and is further extended to achieve the safety factor for the slope instability assessment by different researchers (e.g., [20][21][22][23][24][25]). In this technique, an application of gravity loading is followed by a systematic reduction in soil strength until failure occurs, which is achieved using a strength reduction factor (SRF), to the frictional and cohesive components of strength in the form of factored frictional f  and cohesive compo- …”

Section: Mathematical Foundationmentioning

confidence: 99%

High-Order FEM Formulation for 3-D Slope Instability

Chandra¹,

Prakash²,

Yatabe³

2013

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High-order finite element method (FEM) formulation also referred to as spectral element method (SEM) formulation is currently implemented in this paper for 3-dimensional (3-D) elasto-plastic problems in stability assessment of largescale slopes (vegetated and barren slopes) in different instability conditions such as seismic and saturation. We have reviewed the SEM formulation, and have sought its applicability for vegetated slopes. Utilizing p (high-order polynomial degree or spectral degrees) and h (mesh operation for quality meshing in required elemental budgets) refining techniques in the existing FEM, the complexity of problem domain can be well addressed in greater numerical stability. Unlike the existing FEM formulation, this high-order FEM employs the same integration and interpolation points to achieve a progressive response of the instability, which drastically reduces the computational costs (formation of diagonalized mass matrix) and offers significant benefits to slope instability computations for serial and parallel implementations. With this formulation, we have achieved the following three qualities in slope instability modeling: 1) geometric flexibility of the finite elements, 2) high computational efficiency, and 3) reliable spectral accuracy. A sample problem has also been presented in this paper, which has accommodated all aforesaid numerical qualities.

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Section: Mathematical Foundationmentioning

confidence: 99%

High-Order FEM Formulation for 3-D Slope Instability

Chandra¹,

Prakash²,

Yatabe³

2013

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“…Lane and Griffiths [4,5] used a strength reduction finite element technique to analyze the stability of side slope in different static levels and under the situation of a sudden drop of water level, but they did not consider the influence of unsaturated seepage, and did not use the transient analysis method which could reflect the time effect. Berilgen [6] adopted Plaxis software which considers the coupling of stress and seepage, and combined the strength reduction technique to calculate the stability of side slope under the working condition of drawdown.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on the effect of variation of water level on the stability of soil-cement column reinforced waterway side slope

Li-e¹,

Yi²,

Zhang³

et al. 2018

IJHT

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“…Studies in this field of research can be roughly grouped into three categories: designing engineering geological models [2,5,8,[15][16][17][18], material property studies [19,20] and formulating mathematical models [21][22][23][24][25]. All these categories of studies are equally important and none of these can be excluded in evaluating the stability of a submerged slope.…”

Section: Introductionmentioning

confidence: 99%

A Recognition and Geological Model of a Deep-Seated Ancient Landslide at a Reservoir under Construction

Zou

et al. 2017

Remote Sensing

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Forty-six ancient Tibetan star-shaped towers and a village are located on a giant slope, which would be partially flooded by a nearby reservoir currently under construction. Ground survey, boreholes, and geophysical investigations have been carried out, with results indicating that the slope consists of loose deposit with a mean thickness of approximately 80 m in addition to an overlying bedrock of micaceous schist and phyllite. Ground survey and Interferometric Synthetic Aperture Radar (InSAR) indicated that the slope is experiencing some local deformations, with the appearance of cracks and occurrence of two small landslides. Through using borehole logs with the knowledge of the regional geological background, it can be inferred that the loose deposit is a result of an ancient deep-seated translational landslide. This landslide was initiated along the weak layer of the bedding plane during the last glaciation in the late Pleistocene (Q 3 ) period, which was due to deep incision of the Dadu River at that time. Although it has not shown a major reaction since the ancient Tibetan star-shaped towers have been built (between 200 and 1600 AD), and preliminary studies based on geological and geomorphological analyses incorporated with InSAR technology indicated that the landslide is deformable. Furthermore, these studies highlighted that the rate of deformation is gradually reducing from the head to the toe area of the landslide, with the deformation also exhibiting relationships with seasonal rainstorms. The state of the toe area is very important for stabilizing a landslide and minimizing damage. It can be expected that the coming impoundment of the reservoir will increase pore pressure of the rupture zone at the toe area, which will then reduce resistance and accelerate the deformation. Future measures for protection of the slope should be focused on toe erosion and some bank protection measures (i.e., rock armor) should be adopted in this area. Meanwhile, some long-term monitoring measures should be installed to gain a deep understanding on the stability of this important slope.

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Assessment of Stability of Slopes under Drawdown Conditions

Cited by 170 publications

References 8 publications

High-Order FEM Formulation for 3-D Slope Instability

High-Order FEM Formulation for 3-D Slope Instability

Numerical investigation on the effect of variation of water level on the stability of soil-cement column reinforced waterway side slope

A Recognition and Geological Model of a Deep-Seated Ancient Landslide at a Reservoir under Construction

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