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image of Géotechnique
ISSN: 0016-8505
E-ISSN: 1751-7656

Impact Factor 1.868 (two year);   2.242 (five year);   SJR 3.910.

Established in 1948, Géotechnique is the world's premier geotechnics journal, publishing research of the highest quality on all aspects of geotechnical engineering. Géotechnique provides access to rigorously refereed, current, innovative and authoritative research and practical papers, across the fields of soil and rock mechanics, engineering geology and environmental geotechnics.

  • - To submit to this journal is free. Papers appear Ahead of Print (below) as soon as they are ready to be published. Ahead of print articles are fully citable using the DOI system.

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  • Awards: Each year, the paper rated best by the Advisory Panel is given the ICE's prestigious Geotechnical Research Medal. 
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  • Shear stiffness of granular material at small strains: does it depend on grain size?
    Author(s):  J. YANG; X.Q. GU
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  • The shear stiffness of granular material at small strain levels is a subject of both theoretical and practical interest. This paper poses two fundamental questions that appear to be interrelated: (a) whether this stiffness property is dependent on particle size; and (b) whether the effect of testing method exists in terms of laboratory measurements using resonant column (RC) and bender element (BE) tests. For three uniformly graded types of glass beads of different mean sizes (0·195 mm, 0·920 mm and 1·750 mm), laboratory tests were conducted at a range of confining stresses and void ratios, using an apparatus that incorporates both RC and BE functions and thus allows reliable and insightful comparisons. It is shown that the small-strain stiffness, determined by either the RC or BE tests, does not vary appreciably with particle size, and it may be practically assumed to be size independent. The laboratory experiments also indicate that the BE measurements of small-strain stiffness are comparable to the corresponding RC measurements, with differences of less than 10%. Furthermore, the BE measurements for fine glass beads are found to be consistently higher than the RC measurements, especially at large stress levels, whereas this feature becomes less evident for medium-coarse glass beads, and eventually diminishes for coarse glass beads. The study indicates that the characteristics of output signals in BE tests can be largely affected by the frequency of the input signal, the mean particle size of the material and the confining stress level, and that these factors are interrelated. Improper interpretation of wave signals may lead to shear stiffness measurements that are unreasonably low, either showing a substantial increase with particle size or showing the opposite. A micromechanics-based analysis assuming the Hertz–Mindlin contact law is presented to offer an understanding of the size effect from the grain scale.
  • Mobilisable strength design for flexible embedded retaining walls
    Author(s): M. DIAKOUMI; W. POWRIE
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  • Soil–structure interaction may have an important influence on the behaviour of embedded retaining walls, affecting both wall bending moments and ground movements. However, it can be difficult and time consuming to capture in design, especially in a way that gives a physical insight into the key behavioural mechanisms involved. A calculation procedure has been developed for retaining walls propped near the crest that takes into account both the non-linearity of the stress–strain behaviour of the soil and the flexibility of the wall. Results for different pore water pressure conditions, soil strengths and soil and wall stiffnesses are presented in the form of look-up charts, and are compared with those derived from factored limit equilibrium analyses. A dimensionless parameter is introduced to represent the relative soil–wall stiffness, and its importance is demonstrated. A critical flexibility ratio is identified at which the bending moments start to reduce below those given by a conventional limit equilibrium calculation. This ratio is linked to the wall deflection, and is used to distinguish a stiff from a flexible system in soils of different strengths and pore water pressure conditions. The approach is discussed in relation to previous studies.
  • Measurement of stresses around closed-ended displacement piles in sand
    Author(s): R.J. JARDINE; B.T. ZHU; P. FORAY; Z.X. YANG
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  • Calibration chamber experiments are reported that investigate the evolution of stresses around closed-ended, highly instrumented, model displacement piles during simulated driving into a heavily instrumented sand mass. The soil stresses are shown to vary spatially relative to the pile tip location. As well as showing considerable radial variation, the stresses developed at any given depth build sharply as the tip approaches, and reduce rapidly as it passes. Clear differences are evident between the behaviours seen close to the shaft during alternate penetration and pause periods. Load-cycling effects are most significant close to the shaft, where the local stress paths indicate a tendency for constrained ‘dilatant' behaviour, with radial stresses increasing, during loading. In contrast, markedly ‘contractant' radial stress reductions are evident on unloading.
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