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首页> 外文会议>Mechanical behaviour of soils under environmentally induced cyclic loads >Cyclic Interface Shearing in Sand and Cemented Soils and Application to Axial Response of Piles
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Cyclic Interface Shearing in Sand and Cemented Soils and Application to Axial Response of Piles

机译：砂土和胶结土的循环界面剪切及其在桩轴向响应中的应用

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摘要

For practical offshore design, the effects of cyclic loading are generally based on estimating cumulative 'permanent' and cyclic shear strains, and cumulative excess pore pressure, from cyclic triaxial and simple shear tests. Simple shear tests are favoured over triaxial tests because of the small sample size, greater flexibility in the applied shear stress regimes and because they represent average stress paths well.The shaft friction mobilised along piles driven into sand degrades with distance from the pile tip or, more accurately, the number of shearing cycles imposed on the particular zone of soil during pile installation. Degradation may be expressed by expressing the shaft friction either as a proportion of the vertical effective stress or, in order to allow for variations in sand density, as a proportion of the local cone resistance.
机译：对于实际的海上设计，循环载荷的影响通常基于对循环三轴和简单剪切试验的累积“永久”和循环剪切应变以及累积的过大孔隙压力的估算。简单的剪切试验比三轴试验更受青睐，因为其样本量小，所施加的剪切应力状态下的灵活性更大，并且它们很好地代表了平均应力路径。沿着被打入砂土的桩移动的轴摩擦力会随着距桩尖的距离而降低，或者更准确地说，是在桩安装过程中施加在土壤特定区域的剪切循环数。退化可以通过将轴摩擦力表示为垂直有效应力的一部分来表示，或者为了允许砂密度的变化而以局部圆锥阻力的一部分来表示。

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