The strength and dilatancy of sands

作者：Malcolm D. Bolton · 发表于：Géotechnique · 年份：1986 · DOI：10.1680/geot.1986.36.1.65 · 被引用次数：2741 · 研究领域：Geotechnical Engineering and Soil Mechanics、Geotechnical Engineering and Soil Stabilization、Geotechnical Engineering and Underground Structures

Extensive data of the strength and dilatancy of 17 sands in axisymmetric or plane strain at different densities and confining pressures are collated. The critical state angle of shearing resistance of soil which is shearing at constant volume is principally a function of mineralogy and can readily be determined experimentally within a margin of about 1°, being roughly 33° for quartz and 40° for feldspar. The extra angle of shearing of ‘dense’ soil is correlated to its rate of dilation and thence to its relative density and mean effective stress, combined in a new relative dilatancy index. The data of ø′ max – ø′ crit in triaxial or plane strain are separately fitted within a typical margin of about 2°, though the streneth of certain sands is underpredicted in the 1000–10000 kN/m 2 range owing to the continued dilation of their crush-resistant grains. The practical consequences of these new correlations are assessed, with regard to both laboratory and field testing procedures. L'auteur analyse de nombreuses données concernant la résistance et la dilatance de 17 sables sous déformation plane ou axisymétrique pour différentes densités et pressions d'étreinte. L'angle de résistance au cisaillement dans l'état critique d'un sol soumis au cisaillement à volume constant est principalement une fonction de la minéralogie et peut se déterminer facilement à 1° près, comme ayant une valeur d'environ 33° pour le quartz et 40° pour le feldspath. L'angle supplémentaire de cisaillement d'un ...