Abstract The bearing capacity of shallow foundations under static loads has been widely studied by various authors. In contrast, the bearing capacity under dynamic loads has been solved indirectly by adopting an equivalent pseudostatic approach or by means of reduction coefficients. The study of the problems related to cyclic loads has focused mainly on the behavior of granular soils. However, in the case of cohesive soils, these began to be studied in detail as a result of the Northridge, Kocaeli and Chi-Chi earthquakes that took place in the 90s. The object of the present work is to evaluate the influence of pore pressure in the calculation of bearing capacity of shallow foundation on cohesive soil and dynamically requested. This research is based on the results of cyclic simple shear tests carried out with samples from the Prat port (Barcelona). A pore-water pressure generation equation is proposed that depends on the effective vertical stress “in situ” (σ’ov), static shear stress (τo), cyclic shear stress (τc), and void ratio (e0). The formulation was implemented to the finite difference software FLAC2D, by which the bearing capacity of foundations can be determined. The proposed formulation can calculate the maximum cyclic load (CL) that a cohesive soil can resist before failure by cyclic softening, as a consequence of cyclic loads transferred by a shallow foundation. The practical application of this research is to provide a chart to calculate the bearing capacity of cohesive soils requested by cyclic loading (CL). This application takes into account the properties of the ground, the static load capacity (Phe) and the effective load outside the foundation ( q ). In addition, the formulation is validated in the application of a real case.

中文翻译：

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粘性土循环荷载作用下浅地基承载力

摘要 静载荷作用下浅地基的承载能力已被许多作者广泛研究。相比之下，动态载荷下的承载能力已通过采用等效拟静力方法或通过折减系数间接求解。与循环荷载相关的问题的研究主要集中在颗粒土的行为上。然而，就粘性土壤而言，由于 90 年代发生的 Northridge、Kocaeli 和 Chi-Chi 地震，开始详细研究这些。目前工作的目的是评估孔隙压力在粘性土和动态要求的浅层基础承载力计算中的影响。本研究基于对来自 Prat 港（巴塞罗那）的样品进行的循环简单剪切试验的结果。提出的孔隙水压力生成方程取决于“原位”有效垂直应力 (σ'ov)、静态剪应力 (τo)、循环剪应力 (τc) 和空隙率 (e0)。该公式在有限差分软件FLAC2D上实现，通过该软件可以确定地基承载力。所提出的公式可以计算粘性土在循环软化破坏之前可以抵抗的最大循环载荷 (CL)，这是浅基础传递的循环载荷的结果。本研究的实际应用是提供一个图表来计算循环荷载（CL）所要求的粘性土的承载力。此应用程序考虑了地面的特性、静载荷能力 (Phe) 和基础外的有效载荷 (q)。此外，