Influence of tension cut-off on the stability of anchored concrete soldier-pile walls in clay

Antão, A. N.; Guerra, Nuno; Fernandes, Manuel Matos; Cardoso, António Silva

doi:10.1139/t08-039

Cited by 12 publications

(8 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…With regard to crack depth, according to some lower bound analyses (e.g. ), it can be determined as a function of the tensile strength of the ground and its stress state. However, exceedance of the ground tensile strength is only one of the possible causes for the formation of cracks, because there is experimental evidence about cracks caused and/or deepened by processes such as the occurrence of differential settlements , desiccation and freezing .…”

Section: Introductionmentioning

confidence: 99%

On the stability of fissured slopes subject to seismic action

Utili

Hasan

2016

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

SUMMARYA set of analytical solutions achieved by the upper bound theorem of limit analysis and the pseudo-static approach is presented for the assessment of the stability of homogeneous c, ϕ slopes manifesting vertical cracks and subject to seismic action. Rotational failure mechanisms are considered for slopes with cracks of either known or unknown depth and location. A validation exercise was carried out based on numerical limit analyses and displacement-based finite-element analyses with strength reduction technique.Charts providing the stability factor for fissured slopes subject to both horizontal and vertical accelerations for any combination of c, ϕ and slope inclination are provided. The effect of the direction of the vertical acceleration on slope stability is specifically analysed. Yield seismic coefficients are also provided.When the presence of cracks within the slope can be ascertained with reasonable confidence, maps showing the zones within the slope where they have no destabilising effect are provided.Finally, Newmark's method was employed to assess the effect of cracks on earthquake induced displacements. To this end, displacement coefficients are provided in chart form as a function of the slope characteristics. Two examples of slopes subjected to known earthquakes are illustrated.

show abstract

Section: Introductionmentioning

confidence: 99%

On the stability of fissured slopes subject to seismic action

Utili

Hasan

2016

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

show abstract

“…d-spacings of Stv fromSmyth et al (1995). d-spacings assigned to the surrounding quartz grains(Antao et al 2008). The values for stishovite are marked in bold, while the values for quartz are marked in italic.…”

mentioning

confidence: 99%

Microscopic evidence of stishovite generated in low‐pressure shock experiments on porous sandstone: Constraints on its genesis

Mansfeld

Langenhorst

Ebert

et al. 2017

Meteorit & Planetary Scien

View full text Add to dashboard Cite

It has been almost exactly half a century since the first synthesis of stishovite in shock experiments on quartz was reported, but its formation conditions during shock is still under debate. Here, we present direct transmission electron microscopic observation of stishovite within material recovered from high‐explosive shock experiments on porous sandstone shocked at 7.5 and 12.5 GPa. Our observations allow for new conclusions on the genesis of stishovite in a close‐to‐nature environment. The formation of stishovite in short‐time shock experiments proves that its crystallization is ultrafast (<1 μs). Crystals were found only embedded in amorphous veins indicating homogeneous nucleation. Crystallization from melt rather than from glass can be concluded from the observation of roundish, defect‐free crystals up to 150 nm in diameter embedded in nondensified glass. The formation of stishovite at 7.5 GPa is in accordance with the phase diagram of silica, if rapid undercooling is present that becomes only possible by the existence of small hot spots in an otherwise cold material, which is supported by transient heat calculation. The absence of coesite at 7.5 GPa suggests kinetic hindrance of its crystallization from melt and, thus, smaller critical cooling rates compared to stishovite where critical cooling rates are estimated to be as large as 1011 K s−1. While the amorphous veins containing stishovite represent unambiguously hot spots, no associated pressure amplification could be verified within these veins. The rapid liquidus crystallization of stishovite only in hot spots generated in porous material is an alternative formation mechanism to the widely accepted theory of solid–solid transition from quartz to stishovite and might represent the more general mechanism occurring in nature for low shock pressure events.

show abstract

“…(iii) Numerical methods. Antão et al [24] attempted the finite-element upper bound limit analysis, where the presence of a crack of specified location and depth was included in the stability analysis of a slope reinforced with sheet pile. Liu and Zhao [25] conducted a numerical limit analysis on a wet slope with a tension crack in the upper slope surface using the rigid finite-element method (RFEM).…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Stability of Fissured Slopes Reinforced with Anchor Cables under Seismic Action

Zhang

Jiang

et al. 2021

Mathematical Problems in Engineering

View full text Add to dashboard Cite

Based on the upper bound theorem of limit analysis (UBLA) combined with the pseudostatic methods, this paper elaborates on a calculated procedure for evaluating fissured slope stability under seismic conditions reinforced with prestressed anchor cables. An existing simple slope case is presented as a case study in this work. The comparison is given to verify that the solution derived from this study is correct and feasible. By means of a numerical optimization procedure, the critical location of the crack is determined from the best upper bound solutions. The results demonstrate a significant influence of the depth of crack and seismic acceleration coefficient on the critical location distribution of the cracks. Meanwhile, the axial force of anchor cables is investigated via parametric studies. It is shown that the variation of the crack depth has little effect on the axial force of anchor cables. Moreover, this paper also illustrates the variation in the axial force of anchor cables under the impact of five marked factors (crack depth, anchor arrangement, anchor inclination angle, slope angle, and seismic conditions). Finally, the required critical length of the free section of anchor cables is determined to ensure the stability of fissured slopes subjected to seismic action.

show abstract

Influence of tension cut-off on the stability of anchored concrete soldier-pile walls in clay

Cited by 12 publications

References 2 publications

On the stability of fissured slopes subject to seismic action

On the stability of fissured slopes subject to seismic action

Microscopic evidence of stishovite generated in low‐pressure shock experiments on porous sandstone: Constraints on its genesis

Investigation on the Stability of Fissured Slopes Reinforced with Anchor Cables under Seismic Action

Contact Info

Product

Resources

About