Discussion: Collapse of Saturated Soil Due to Reduction in Confinement

Santos, Olavo Francisco dos; Lacerda, Willy A.; Ehrlich, M.

doi:10.1061/(asce)0733-9410(1996)122:6(505)

Cited by 6 publications

(5 citation statements)

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“…6b). The results for the undrained creep tests in the CSD stress path presented by Santos et al (1996) demonstrated that for the Soberbo residual soil during the undrained creep period, the soil stress path moves away from the soil failure envelope. The results for the drained creep tests shown in Figs.…”

Section: Drained Creep Tests (Dc-csd)mentioning

confidence: 95%

“…The results of triaxial tests with failure induced by increasing the pore pressure have been reported by different researchers. Brenner et al (1985), Santos et al (1996), Zhu and Anderson (1998), Tsukamoto (2002), Ng and Petley (2009); Junaideen et al (2010) performed tests in residual soils. Test results in colluvial soils have been reported by Anderson and Riemer (1995), Anderson and Sitar (1995), Dai et al (1999a and b).…”

Section: Introductionmentioning

confidence: 99%

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Effects of Cyclic Variations of Pore Pressure on the Behaviour of a Gneiss Residual Soil

2020

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Many slope failures in residual soils have been attributed to increased soil pore pressure. During the rainy season, water infiltration occurs, which can lead the slope to rupture by increasing the pore pressure. However, some landslides have been observed with pore pressures below those required for failure. Hypotheses for such ruptures include the occurrence of creep or fatigue due to cyclic variations in the piezometric level on the slope. This paper presents a study on the effect of pore pressure on the behaviour of the residual soil of the Soberbo hillside in Rio de Janeiro, Brazil, subjected to monotonic and cyclic pore pressure. Triaxial tests that simulate the increasing piezometric level (constant shear drained-CSD tests), drained creep (DC-CSD tests) and cyclic pore pressure variation (CPP tests) in slopes were carried out. The CSD test results showed that the failure due to increasing pore pressure is essentially dilatant and confirmed the peak strength obtained from conventional drained triaxial tests. Sudden failure was observed in all CSD tests at the end of the pore pressure increase phase. The results show that the failure of the slope may occur due to drained creep and the loss of soil shear strength under cycling pore pressure.

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Section: Drained Creep Tests (Dc-csd)mentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Effects of Cyclic Variations of Pore Pressure on the Behaviour of a Gneiss Residual Soil

2020

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“…This latter behaviour could be considered surprising, since the same soil showed a contractant behaviour in anisotropically consolidated undrained compression (CAU) tests, with an ultimate deviatoric stress generally smaller than the initial deviatoric stress (Anderson & Sitar, 1995). A similar behaviour was observed by Santos et al (1996) on a residual soil from Soberbo Road, Rio de Janeiro, questioning the relevance of CAU tests for evaluating contractancy±dilatancy behaviour after failure.…”

Section: Frictional Energymentioning

confidence: 97%

“…The importance of this aspect has been evidenced by work by Anderson & Riemer (1995), Anderson & Sitar (1995) and Santos et al (1996) in relation to slides induced by pore pressure increase. Indeed, most laboratory tests are performed in compression or in extension, whereas in situ behaviour corresponds to a decrease in effective mean stress under an approximately constant shear stress.…”

Section: Frictional Energymentioning

confidence: 99%

“…In (a), Y could be above, on or below the critical-state line, depending on the soil considered Anderson & Riemer (1995) on colluvial soil (Fig. 77(b)) and by Santos et al (1996) on Soberbo Road residual soil. Finally, we can imagine initial stress conditions such as I 4 leading to yielding at point Y 4 , identical to C 4 , on the CSL; in this case, the soil would not have a tendency to change its void ratio after reaching failure.…”

Section: Frictional Energymentioning

confidence: 99%

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Natural slopes and cuts: movement and failure mechanisms

2001

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Movements and failure of cuts and natural slopes constitute an important geotechnical problem that involves a variety of geomaterials in a variety of geological and climatic contexts, and which has a major socio-economic impact in many countries. The paper reviews the state of knowledge in this domain, examining the basic aspects of soil mechanics that are relevant to the context of slopes, the importance of water on slope behaviour, and then the different stages of slope movements: pre-failure, failure, post-failure and reactivation. Finally it is shown how the geotechnical characterisation of slope movements can be used, in particular for assessing risk associated with such movements. Emphasis is put on for the brittleness of soils and its practical implications for the progressive failure developing at the pre-failure stage and on the characteristics of post-failure movements. The in¯uence of other factors such as creep, fatigue, destructuration, partial saturation and in®ltration is also considered.

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Unstable behaviour of sand and its implication for slope instability

Chu¹,

Leroueil²,

Leong³

2003

Can. Geotech. J.

190

129

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Results of some constant shear-drained (CSD) tests conducted on both loose and dense sand are presented. Using the critical state line and a modified state parameter, a new framework for analysing the instability of granular soil slopes is proposed. The test data were examined and interpreted using the new framework. Instability lines for sand with different void ratios were established within this framework. The conditions for the occurrence of instability in both contractive and dilative granular soil slopes under various shear stress levels were examined using the proposed framework.Key words: deformation, laboratory tests, liquefaction, sands, shear strength, slope stability.

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Discussion: Collapse of Saturated Soil Due to Reduction in Confinement

Cited by 6 publications

References 0 publications

Effects of Cyclic Variations of Pore Pressure on the Behaviour of a Gneiss Residual Soil

Effects of Cyclic Variations of Pore Pressure on the Behaviour of a Gneiss Residual Soil

Natural slopes and cuts: movement and failure mechanisms

Unstable behaviour of sand and its implication for slope instability

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