Stability of Earth Slopes

Fang, Hsai-Yang; Mikroudis, George K.

doi:10.1007/978-1-4615-3928-5_10

Cited by 19 publications

(9 citation statements)

References 37 publications

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“…The lower the FOS value is, the higher the risk of failure would be. Many methods are available for calculating the FOS of a slope (Huang 1983;Fang and Mikroudis 1991;Duncan 1996). A majority of the calculation methods are based on the limit equilibrium method of slices and make use of the MohrCoulomb failure criterion.…”

Section: Calculation Methods For Factor Of Safetymentioning

confidence: 99%

“…The Bishop method is one of the classical methods of slices. It has been used frequently by engineers in routine slope stability assessments (Fang and Mikroudis 1991). It can accommodate complex geometries and variable soil and groundwater conditions.…”

Section: Calculation Methods For Factor Of Safetymentioning

confidence: 99%

“…A review of the literature indicates that much work has been carried out on the assessment of slope stability problems (Bishop 1955;Morgenstern 1963;Morgenstern and Price 1965;Janbu 1977;Skempton 1977;Carson and Lajoie 1981;Lefebvre 1981;GCO 1984b;Roy and Leblanc 1988;Broms and Wong 1991;Fang and Mikroudis 1991;Lacasse 2001;Lee et al 2001;Sheng et al 2002;Yue and Lee 2002). Analytical methods developed for general application have also been adopted for the stability assessment of dredged slopes in underconsolidated and submerged soft soils in routine engineering practice (BSI 1988;CEO 1996;Tsinker 1997).…”

Section: Introductionmentioning

confidence: 98%

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Slope failure in underconsolidated soft soils during the development of a port in Tianjin, China. Part 2: Analytical study

Li¹,

Yue²,

Tham³

et al. 2005

Can. Geotech. J.

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This paper presents the analytical study of a major landslide that occurred in a newly dredged slope during port development in the city of Tianjin, northern China. The slope comprised mainly underconsolidated and submerged soft soils. The landslide consisted of a number of individual slides that occurred sequentially and extended retrogressively and laterally into the reclaimed land. The paper proposes a slope stability assessment methodology for the examination of such slope failures, with retrogressive and lateral extension into reclaimed land. Both the total and the effective stress approaches are adopted in the slope stability assessment. Eight different sets of soil shear strength parameters are used in the assessment. They were determined by using different methods in the laboratory and in the field or by back analysis. The assessment results indicate that the total stress approach, together with undrained vane strength values, gives the best result in the stability assessment of the original dredged slope and the subsequent failed slopes. The paper further examines the factors that might have caused or triggered the occurrence of the landslide. Backfilling of a thick general soil layer and a sand cushion for vacuum preloading of the hydraulic fill in the reclaimed land might have rendered the entire slope marginally stable. Lowering of the tidal level might also have had an effect in triggering the landslide. The engineering approach and results presented in this study could be useful in the design and construction of dredged slopes in underconsolidated soft soils.Résumé : Cet article présente l'étude analytique d'un important glissement de terrain qui s'est produit dans un talus nouvellement dragué pour le développement du port de la Cité de Tianjin dans le nord de la Chine. Le talus comprenait principalement des sols mous sous-consolidés et submergés. Le glissement consistait en un certain nombre de glissements individuels qui se sont produits de façon séquentielle et se sont étendus rétrogressivement et latéralement dans un terrain de remblayage en mer. Cet article propose une méthodologie d'évaluation de la stabilité pour l'examen de telles ruptures de talus avec rétrogression et extension latérale dans le terrain dragué. Les approches en fonction des contraintes totales et effectives ont été adoptées pour l'évaluation de la stabilité du talus. On a utilisé huit différents ensembles de paramètres de résistance au cisaillement du sol pour l'évaluation. Ils ont été déterminés au moyen de diffé-rentes méthodes en laboratoire et sur le terrain, ou par analyse à rebours. Les résultats de l'évaluation indiquent que l'approche en contraintes totales avec les valeurs de résistance non drainée au scissomètre donne le meilleur résultat pour l'évaluation de la stabilité du talus original dragué et des talus qui ont subséquemment atteint la rupture. L'article examine par la suite les facteurs qui auraient pu causé ou déclenché le glissement de terrain. Le remblayage d'une couche épaisse d'un sol quelconque et l'a...

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Section: Calculation Methods For Factor Of Safetymentioning

confidence: 99%

Section: Calculation Methods For Factor Of Safetymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Slope failure in underconsolidated soft soils during the development of a port in Tianjin, China. Part 2: Analytical study

Li¹,

Yue²,

Tham³

et al. 2005

Can. Geotech. J.

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“…They cause great danger to structures and people close to them. Slide or slope failure is a downward and outward movement of a slope that causes failure of a mass of soil [1] [2]. Slides or slopes failure are usually caused by excavation, by undercutting at the foot of an existing slope, by gradual disintegration of the structure of the soil, by an increase of the pore water pressure, or by vibration or shock.…”

Section: Introductionmentioning

confidence: 99%

Slope Instability at Nablus-Al Bathan Road, Palestinian Territories (Causes, Analysis and Remedy Measurements)

Jardaneh¹,

Hijjawi²,

Odeh³

2021

WJET

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Nablus-Al Bathan Road which connects Nablus City and Jordan Valley in the West Bank of Palestinian Territories, was widened, reconstructed and rehabilitated in 2009, however, between 2010 and 2012 road defects at several locations were observed. To fix these defects especially at station 2 + 100 of the road, soil replacement in the body of the road and big boulders to support the edge of the road were used. Unfortunately, large settlement occurred in the part of the road under maintenance and more sliding and slope instability occurred in the road at station 2 + 100 during the remedial measures. Studies were carried out to find the causes of this problem. These included surveying of the area, geotechnical studies (making trial pits, performing geophysical seismic exploration and digging out several boreholes), in addition to slope stability analysis. It was found that the main causes of landslides were types of soils at the site, high slopes, groundwater recharged from rainfall and changing of weights (cut and fill). Remedy measures were suggested to overcome sliding problem based on available resources and local technology.

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“…A literature review indicates that tremendous efforts have been made in the assessment of slope stability in such soils (Morgenstern 1963;Janbu 1977;Skempton 1977;Lefebvre 1981;GCO 1984b;Roy and Leblanc 1988;Broms and Wong 1991;Fang and Mikroudis 1991;Lacasse 2001;Lee et al 2001; Yue and Lee 2002). Slope stability analysis methods developed for general applications have also been adopted for stability assessments of marine slopes in underconsolidated soft soils (BSI 1988;CEO 1996;Tsinker 1997).…”

Section: Introductionmentioning

confidence: 99%

Slope failure in underconsolidated soft soils during the development of a port in Tianjin, China. Part 1: Field investigation

Li¹,

Yue²,

Tham³

et al. 2005

Can. Geotech. J.

View full text Add to dashboard Cite

This paper presents the field investigation of a major landslide that occurred in a newly dredged slope for port development in the city of Tianjin, northern China. The dredged slope comprised underconsolidated soft clay of recent marine and river delta deposits. The landslide consisted of a number of individual slides that occurred sequentially and extended retrogressively and laterally into reclaimed land. It lasted for about 1 h, occupying a plan area that is about 200 m long and 150 m wide in the reclaimed land. The failed soil mass was estimated to have a volume of between 700 000 and 800 000 m3. Part of the failed soil mass slipped into a newly dredged open space in the sea. The distance of the debris travel into the berth was about 80 m. The debris surface had a gentle slope of about 3.0°. The angle from the dredged slope crest to the far edge of the debris was about 6.8°. A common rupture surface was found underneath the debris and above the in situ marine mud. It controlled the inland extension of the slope failure. The landslide occupied an inclined area of between 27 000 and 30 000 m2, with an overall slope angle of about 34°. A kinematic model is proposed to explain the extension of the landslide into the reclaimed land. Findings of this field investigation are further used in the companion paper for a theoretical investigation of the mechanism of the landslide. The engineering approach and results presented in this study could be useful in the design and construction of dredged slopes in underconsolidated soft soils. Key words: port development, land reclamation, dredge excavation, landslide investigation, soft soils, case studies.

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Stability of Earth Slopes

Cited by 19 publications

References 37 publications

Slope failure in underconsolidated soft soils during the development of a port in Tianjin, China. Part 2: Analytical study

Slope failure in underconsolidated soft soils during the development of a port in Tianjin, China. Part 2: Analytical study

Slope Instability at Nablus-Al Bathan Road, Palestinian Territories (Causes, Analysis and Remedy Measurements)

Slope failure in underconsolidated soft soils during the development of a port in Tianjin, China. Part 1: Field investigation

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