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本文叙述了在浸水的超固结粘土试验场地上对装有测量仪器的、不同直径的桩所进行的一系列实比、周期、侧荷试验。在这试验的基础上建立了一个P—Y模型。这个模型可以用来确定桩径、桩和土的相对刚度以及荷载循环次数对此种场地类型的单位荷载一偏斜关系的影响程度。这一模型特别地适用于大直径的桩。它与实际中所观察到的现象相吻合。即存在一个临界偏斜,低于这一值时,土的周期性软化不再发生。它反映了所推断的事实,即软化主要由桩和土之间的间隙引起,并由于水力冲刷加剧。而每次加荷之间的静止期间不但不会导致土的抵抗性能提高,而事实上看来却通过膨胀引起进一步软化。
This article describes a series of ratios, cycles, and sideload tests performed on piles of different diameters equipped with a measuring instrument on a flooded overconsolidated clay test site. Based on this experiment, a P-Y model was established. This model can be used to determine the degree of influence of the unit load-deflection relationship for such site types on the relative diameters of the pile diameter, pile and soil, and the number of load cycles. This model is particularly suitable for large diameter piles. It coincides with the observed phenomena in practice. That is, there is a critical deflection below which the periodic softening of the soil no longer occurs. It reflects the fact that is inferred that softening is mainly caused by the gap between the pile and soil and is exacerbated by the hydroflushing. However, the static period between each load will not only lead to an increase in soil resistance, but in fact it will cause further softening through expansion.